阅读说明：本技术 一种炼化油泥绿色分离方法 (Environment-friendly separation method of refined oil sludge ) 是由 张大山 张文艺 陈慧娴 何敏 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种炼化油泥绿色分离方法,其包括如下步骤：配制热洗药剂溶液、混合、超声分散、离心、热洗1、热洗2、热洗3。本发明有着简化处理设施,优化处理流程,采用超声-生物热洗协同方法,处理流程为3步,实现除油率达82.6％、清洗剂可回收重复使用、产物无污染可进行深度处理的优点。(The invention discloses a green separation method of refined oil sludge, which comprises the following steps: preparing hot washing agent solution, mixing, ultrasonically dispersing, centrifuging, hot washing 1, hot washing 2 and hot washing 3. The invention has the advantages of simplifying treatment facilities, optimizing treatment flow, adopting an ultrasonic-biological hot washing synergistic method, realizing oil removal rate of 82.6 percent, recycling the cleaning agent, having no pollution to products and being capable of carrying out advanced treatment, and the treatment flow is 3 steps.)

1. A green separation method of refined oil sludge is characterized in that: the method comprises the following steps:

preparing a hot washing agent solution: mixing biological surfactants, dissolving in water, and adding NaCl to prepare a hot washing agent solution;

mixing: mixing the hot washing agent solution with refined oil sludge;

ultrasonic dispersion: uniformly dispersing the mixed hot washing agent solution and refined oil sludge under the ultrasonic condition;

centrifuging: centrifuging the uniformly mixed solution;

hot washing 1: the solution after centrifugation is layered in three layers, the upper layer is subjected to resource treatment, the middle layer is a hot washing agent 1, and the lower layer is pre-deoiled sludge 1;

and (3) hot washing 2: recovering the hot washing agent 1 obtained in the hot washing step 1, treating the refined oil sludge, and dividing the treated oil sludge into three layers, wherein the upper layer is subjected to resource treatment, the middle layer is the hot washing agent 2, and the lower layer is the pre-deoiled sludge 2;

hot washing 3: and recovering the hot washing agent 2 obtained in the hot washing 2, and treating the refined oil sludge.

2. The process according to claim 1, wherein the green separation of the refined oil sludge comprises: in the prepared hot washing agent solution, the biosurfactant comprises one or more of algal glycolipid, sophorolipid, rhamnolipid and erythroglycolipid.

3. The refinery oil sludge green separation method according to claim 1 or 2, characterized by comprising: in the preparation of the hot washing agent solution, the biosurfactant comprises algal glycolipid and sophorolipid.

4. A process according to claim 3 for the green separation of refinery oil sludge, characterized in that: the mass ratio of the seaweed glycolipid to the sophorolipid is 1-2: 1-2.

5. The process according to claim 1, wherein the green separation of the refined oil sludge comprises: in the hot washing 1, the hot washing 2 and the hot washing 3, the temperature of the hot washing is 45-55 ℃.

6. The process according to claim 1, wherein the green separation of the refined oil sludge comprises: in the ultrasonic dispersion, the ultrasonic power is 30-50W.

7. The green separation method of refined oil sludge according to claim 1, characterized in that: the concentration of the hot washing agent diluted solution prepared from the biosurfactant is 1.5-2.5 wt%.

8. The green separation method of refined oil sludge according to claim 1, characterized in that: in the mixing, the mass ratio of the refined oil sludge to the hot washing diluent solution is 1: 6-1: 8.

9. The green separation method of refined oil sludge according to claim 1, characterized in that: in the preparation of the hot washing agent solution, the using amount of NaCl is 2-6% of the mass of the hot washing agent solution.

10. The green separation method of refined oil sludge according to claim 1, characterized in that: the hot washing time is 45-55 min.

Technical Field

The invention relates to the technical field of high-concentration petroleum-polluted soil, in particular to a green separation method of refined oil sludge.

Background

Refining sludge is a special hazardous waste generated in the oil production and refining process and usually exists in the form of water-in-oil (W/O). The petroleum hydrocarbon contains a large amount of petroleum hydrocarbon and toxic and harmful substances, such as hydrocarbon, pathogenic bacteria, heavy metal and the like, and if the petroleum hydrocarbon is not properly treated, not only is petroleum resources wasted, but also the environment is seriously polluted, and the human health is harmed. The treatment standard of the refined oil sludge established abroad is as follows: the total content of petroleum hydrocarbon in the soil for road construction is not more than 5 percent; the total content of petroleum hydrocarbon in the agricultural soil is less than 0.3 percent. It is also listed in national hazardous waste catalog 2021 (waste category HW08, waste code 251) 002-08 in China. Therefore, the refining oil sludge is reduced, harmlessly treated and recycled.

At present, the treatment technologies for refining oil sludge at home and abroad mainly comprise a pyrolysis method, an incineration method, a biological method, a solvent extraction method, a thermochemical cleaning method and the like. The pyrolysis method and the incineration method consume a large amount of energy in the treatment process, generate waste gas to pollute the environment, are not fully combusted, are easy to cause pollutant transfer and influence the property of the product. The solvent extraction method and the thermochemical cleaning method have high treatment efficiency, but are easy to cause secondary pollution, and products cannot be further deeply treated. The biological method has thorough treatment, but the period is long and the requirement on the environment is harsh.

The current developments in the technical field are as follows, and the research results of Liu Hao are reported in "chemical development" 2013, volume 32, page 12, 2952 and 2960: the lipopeptide-glycolipid mixed biological surfactant reduces the oil-water interfacial tension, and the oil displacement rate reaches 73.5 percent under the condition that n-octanol is used as an auxiliary agent. The research findings of the Wangxiaofeng are reported in the book No. 2 2952 and 2960 of 2019: the oil content of the oil sludge is obviously reduced after the lactone sophorolipid is subjected to hot washing by taking NaCl as an auxiliary agent. The invention patent of Chinese patent publication No. CN1724422A discloses a method for cleaning oil sludge by flowing type multistage chemical heating, which washes oil-containing sludge by high-pressure circulating hot water, adopts multistage washing tanks to carry out serial cleaning, and throws different chemical agents into the cleaning tanks, and finally the recovery rate of crude oil reaches more than 80%. The invention patent of Chinese patent publication No. CN102583919A discloses an ultrasonic-assisted oil sludge hot water washing device and method, wherein sodium dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene ether and sodium carbonate are used as surfactants, and the oil removal rate can reach more than 80% after hot washing. Because the oil in the oil sludge can not be completely removed by the chemical hot washing technology, the oil sludge needs to be further treated after the chemical hot washing, and the oil sludge residue is easy to generate chemical reaction in the chemical hot washing treatment to generate new products, so that the deep treatment of the oil sludge is influenced, and secondary pollution is generated. Therefore, the two methods have certain limitations on the removal of oil content of the oil sludge, and the problem of deep treatment of refined oil sludge is not effectively solved. The treatment facilities based on the technical methods are generally multistage, long and complex in flow, difficult to recover chemical cleaning agents, resource waste, incomplete oil sludge treatment, rich in chemical substances in products and incapable of advanced treatment, for example, in the invention patent of Chinese patent publication No. CN102583919A, the treatment facilities are 21 stages in total, the treatment flow is 6 steps, chemicals after cleaning are required to be added with a flocculating agent for recovery treatment, and the treated oil sludge residues are rich in residual chemical surface active substances and are required to be treated as hazardous wastes.

Therefore, a new technology which has simple treatment process, more thorough oil removal and no secondary pollution is urgently needed.

Disclosure of Invention

The purpose of the present invention is to present some aspects of embodiments of the invention in a simplified form as well as to present some preferred embodiments. This section, as well as the abstract and the title of the application, may be simplified or omitted to avoid obscuring the purpose of this section, the abstract and the title of the application, and such simplification or omission is not intended to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems with the existing refinery sludge separation process.

Therefore, one of the purposes of the invention is to overcome the defects of the existing refining oil sludge separation method and provide a refining oil sludge green separation method.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions: a green separation method of refined oil sludge comprises the following steps:

preparing a hot washing agent solution: mixing biological surfactants, dissolving in water, and adding NaCl to prepare a hot washing agent solution;

mixing: mixing the hot washing agent solution with refined oil sludge;

ultrasonic dispersion: uniformly dispersing the mixed hot washing agent solution and refined oil sludge under the ultrasonic condition;

centrifuging: centrifuging the uniformly mixed solution;

hot washing 1: the solution after centrifugation is layered in three layers, the upper layer is subjected to resource treatment, the middle layer is a hot washing agent 1, and the lower layer is pre-deoiled sludge 1;

and (3) hot washing 2: recovering the hot washing agent 1 obtained in the hot washing step 1, treating the refined oil sludge, and dividing the treated oil sludge into three layers, wherein the upper layer is subjected to resource treatment, the middle layer is the hot washing agent 2, and the lower layer is the pre-deoiled sludge 2;

hot washing 3: and recovering the hot washing agent 2 obtained in the hot washing 2, and treating the refined oil sludge.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: in the preparation of the hot washing agent solution, the biosurfactant comprises one or more of algal glycolipid, sophorolipid, rhamnolipid and erythroglycolipid.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: and preparing a hot washing medicament solution, wherein the biosurfactant comprises algal glycolipid and sophorolipid.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: the mass ratio of the seaweed glycolipid to the sophorolipid is 1-2: 1-2.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: in the hot washing, the temperature of the hot washing is 45-55 ℃.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: in the hot washing, the temperature of the hot washing is 50 ℃.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: in the ultrasonic dispersion, the ultrasonic power is 30-50W.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: in ultrasonic dispersion, the ultrasonic power was 40W.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: the concentration of the hot washing agent diluted solution prepared by the biosurfactant is 1.5-2.5 wt%.

The invention provides a preferable scheme of the refining oil sludge green separation method, wherein: and in the mixing process, the mass ratio of the refined oil sludge to the hot washing diluent solution is 1: 6-1: 8.

The invention has the following advantages:

(1) the oil removal rate of the refined oil sludge is improved and can reach 82.6 percent;

(2) the upper oil phase and the middle water phase collected in each stage can be recycled, and the lower sludge residue can be subjected to subsequent advanced treatment; the treatment cost of the refined oil sludge is reduced;

(3) products in each stage are nontoxic, harmless and pollution-free;

(4) the treatment aims of reduction, resource utilization and harmlessness of the refined oil sludge are realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a process flow diagram of the process of the present invention;

FIG. 2 is a diagram of an ultrasonic-biological heat washing treatment device;

FIG. 3 is a mechanism diagram of oil and fat cleaning by green detergent.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments thereof are described in detail below with reference to examples of the specification.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The method for measuring the oil removal rate of the removed oil described in the examples of the present invention is as follows: the solvent is petroleum ether, and the instrument comprises a Soxhlet extractor, an ultraviolet spectrophotometer and an oven; the specific determination steps are as follows:

1. putting the oil sludge to be tested into an oven (the temperature is set to be 60 ℃) to dry the oil sludge to constant weight (the weight difference is less than 0.005g every hour)

2. Taking out, wrapping with filter paper, placing into a Soxhlet extractor, and simultaneously adding 90ml of petroleum ether;

3. setting the temperature of a water bath kettle at 80 ℃, and performing soxhlet extraction for 6 hours;

4. after the extraction is finished, measuring the absorbance of the obtained mixed solution;

5. and comparing the standard curve according to the obtained absorbance value to obtain the oil content.

Example 1

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 82.6 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 71.1 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 55.5 percent.

Example 2

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a 1.5 wt% hot washing medicament diluted solution from biological surfactants of rhamnolipid and erythrosine according to the mass ratio of 1:1, and weighing NaCl which is 4% of the mass of the hot washing medicament solution and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 75.1 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 65.9 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 51.6 percent of oil content in the pre-deoiled sludge can be removed.

Example 3

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:2, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 76.9 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 66.5 percent.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 51.8 percent of oil content in the pre-deoiled sludge can be removed.

Example 4

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 2:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 78.4 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 68.0 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 53.1 percent of oil content in the pre-deoiled sludge can be removed.

Example 5

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 1.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 45 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 71.2 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 61.5 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 47.4 percent.

Example 6

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 1.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 55 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 75.0 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 64.7 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 50.6 percent.

Example 7

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 1.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 30W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 68.5 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 59.6 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the pre-deoiled sludge can remove about 46.5 percent of oil content.

Example 8

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 1.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 50W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 68.1 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 58.8 percent.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the pre-deoiled sludge can remove about 46.3 percent of oil content.

Example 9

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 1.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, setting the stirring speed to be 250r/min, and starting the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 74.6 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 65.2 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 50.7 percent.

Example 10

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2.5 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, setting the stirring speed to be 250r/min, and starting the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 70.1 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 60.8 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 47.5 percent.

Example 11

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:6, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 69.9 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 60.9 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 47.0 percent.

Example 12

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:8, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 74.1 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 64.2 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 49.9 percent.

Example 13

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 2% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 77.2 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 66.8 percent.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 51.4 percent of oil content in the pre-deoiled sludge can be removed.

Example 14

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 6% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 73.9 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 64.1 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 49.9 percent.

Example 15

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 200r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 66.8 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 57.5 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 45.1 percent of oil content in the pre-deoiled sludge can be removed.

Example 16

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 300r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 50 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, the pre-deoiled sludge can remove about 74.6 percent of oil content.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 64.3 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the oil content of the pre-deoiled sludge can be removed by about 50.1 percent.

Example 17

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 45 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 71.2 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 61.4 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 48.1 percent of oil content in the pre-deoiled sludge can be removed.

Example 18

The water content of the refined oil sludge before treatment was 35.14 wt%, the oil content was 32.64 wt% (the oil content of the oil sludge after dehydration was 503.2g/kg), the solid content was 32.22 wt%, the appearance was black, the texture was coarse, and no fluidity was observed.

Firstly, preparing a hot washing medicament diluted solution with the biological surfactant of algal glycolipid and sophorolipid and the concentration of 2 wt% according to the mass ratio of 1:1, weighing NaCl which is 4% of the mass of the hot washing medicament solution, and adding the NaCl into the hot washing medicament solution.

And secondly, mixing the refined oil sludge and the hot washing diluent solution according to the mass ratio of 1:7, and adding the mixture into an ultrasonic cleaning instrument.

And thirdly, setting the hot washing temperature to be 50 ℃, the ultrasonic power to be 40W, the stirring speed to be 250r/min, and opening the ultrasonic cleaning instrument and the stirring device after the temperature is stable, wherein the hot washing time is 55 min.

And step four, after the ultrasonic-biological hot washing is finished, pouring the obtained mixed solution into a centrifuge tube for centrifugation (the rotation speed is 4000rpm, the time is 10min), and performing three-phase separation after the centrifugation: upper oil phase, middle water phase and lower sludge residue.

And fifthly, recycling the upper oil phase for resource treatment, recycling the middle water phase as a next hot washing agent, and continuously and deeply treating the lower sludge residue as pre-deoiled sludge. Compared with the original high-concentration oil-free sludge, about 75.0 percent of oil content in the pre-deoiled sludge can be removed.

And sixthly, taking the middle-layer water phase obtained in the fifth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, about 64.8 percent of oil content in the pre-deoiled sludge can be removed.

And seventhly, taking the middle-layer water phase obtained in the sixth step as a green cleaning agent in the stage, and repeating the second step to the fifth step. Compared with the original refined oil sludge, the pre-deoiled sludge can remove about 50.5 percent of oil content.

According to the oil removal performance measured in examples 1 to 18, the green cleaning agent prepared in example 1 was obtained with the best performance in removing three kinds of oil.

From the oil removing performance of the green detergent prepared in examples 1 and 2, trehalose paper and sophorolipid are preferred as the biosurfactant species.

From the oil removing performance of the green detergent prepared in examples 1, 3 and 4, it can be understood that the preferable ratio of the algal glycolipid and the sophorolipid in the biosurfactant used is 1:1 by mass.

The deoiling performance of the green detergents prepared in examples 1, 5 and 6 shows that the hot washing temperature is preferably 50 ℃.

The oil removal performance of the green cleaning agents prepared in examples 1, 7 and 8 shows that the ultrasonic power is preferably 40W.

From the oil removing performance of the green detergent prepared in examples 1, 9 and 10, it can be understood that the preferable concentration of the hot washing agent consisting of algal glycolipid and sophorolipid is 2 wt%.

From the oil-removing performance of the green detergents prepared in examples 1, 11 and 12, the mass ratio of the refined oil sludge to the hot-wash diluted solution is preferably 1: 7.

As can be seen from the oil removing performance of the green detergents prepared in examples 1, 13 and 14, the amount of NaCl used is preferably 4% by mass of the hot-washing chemical solution.

As can be seen from the oil removing performance of the green detergents prepared in examples 1, 15 and 16, the stirring rate at the time of ultrasonication is preferably 250 rpm.

As can be seen from the oil removing performance of the green cleaning agents prepared in examples 1, 17 and 18, the hot washing time was 50 min.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.