阅读说明：本技术 过滤网清洗方法 (Filter screen cleaning method ) 是由 何小麟 于 2020-03-24 设计创作，主要内容包括：本发明公开了一种过滤网清洗方法,所述方法包括：用碱洗液对过滤网进行正向冲洗；所述碱洗液包括除油剂XDA5；用酸洗液对所述过滤网进行反向冲洗；所述酸洗液包括硝酸、草酸、羟基乙酸、羟基亚乙基二膦酸与硫酸化油；用漂洗液对所述过滤网进行漂洗；用次氯酸钠溶液浸泡所述过滤网；用除盐水清洗所述过滤网。本发明能够提高清洗效果并减少过滤网上的化学药剂残留。(The invention discloses a method for cleaning a filter screen, which comprises the following steps: forward washing the filter screen with alkaline washing liquor; the alkaline washing liquid comprises an oil removing agent XDA 5; the filter screen is reversely washed by acid washing liquid; the pickling solution comprises nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil; rinsing the filter screen by using a rinsing liquid; soaking the filter screen in a sodium hypochlorite solution; and cleaning the filter screen by using demineralized water. The invention can improve the cleaning effect and reduce the chemical agent residue on the filter screen.)

1. A method for cleaning a filter screen is characterized by comprising the following steps:

forward washing the filter screen with alkaline washing liquor; the alkaline washing liquid comprises an oil removing agent XDA 5;

the filter screen is reversely washed by acid washing liquid; the pickling solution comprises nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil;

rinsing the filter screen by using a rinsing liquid;

soaking the filter screen in a sodium hypochlorite solution;

and cleaning the filter screen by using demineralized water.

2. The method for cleaning the filter screen according to claim 1, wherein the alkaline solution comprises 2-3% of alkaline solution diluted by an oil removal agent XDA5 and a defoaming agent added into the alkaline solution.

3. The filter screen cleaning method according to claim 1, wherein the pickling solution comprises, in parts: 2-4 parts of 30% nitric acid, 0.5-1 part of 98% oxalic acid, 1-2.5 parts of 70% glycolic acid, 0.5-1 part of 50% hydroxyethylidene diphosphonic acid, 0.3-0.5 part of sulfated oil and 91-97 parts of water.

4. The method of cleaning a filter screen according to claim 1, wherein the forward rinsing of the filter screen with the alkaline wash solution comprises:

and (3) positively washing the filter screen by using an alkaline washing liquid with the temperature of 30-40 ℃ by using a water pump, and then positively washing the filter screen by using clear water.

5. The filter screen cleaning method according to claim 1, wherein the back-flushing the filter screen with the pickling solution comprises:

the pickling solution is used for back flushing the filter screen through a water pump of the ultrafiltration system; during the cleaning process, the pressure difference of the ultrafiltration system across the filter screen is reduced from 0.2MPa at the beginning of washing to 0.05MPa at the end of washing, and the water production flow of the ultrafiltration system is increased from 120m3/h at the beginning of washing to 180m3/h at the end of washing.

6. The method for cleaning the filter screen according to claim 5, wherein the flow rate of the back washing is 2-4 times of the filtering flow rate of the ultrafiltration system.

7. The method for cleaning the filter screen according to claim 1, wherein the rinsing liquid comprises 0.1-0.3% by mass of citric acid solution, 0.1% of citric acid corrosion inhibitor and 0.05% of EDTA (ethylene diamine tetraacetic acid) which is a rinsing aid.

8. The method for cleaning the filter screen according to claim 1 or 7, wherein the H value of the rinsing liquid is 3-3.5, the rinsing temperature of the rinsing liquid to the filter screen is 55-60 ℃, and the rinsing time is 2 hours.

9. The method for cleaning the filter screen according to claim 1, wherein the concentration of sodium hypochlorite in the sodium hypochlorite solution is 1.5%; the soaking time of the filter screen in the sodium hypochlorite solution is 1 hour.

Technical Field

The invention relates to the technical field of filter screens, in particular to a filter screen cleaning method.

Background

In the field of industrial water treatment, the filter screen technology is a brand-new practical technology and has the filtering effects of high efficiency, energy conservation, no pollution, convenient operation and the like. However, after a period of use, the filter screen may be contaminated (for example, the surface has attachments) to affect the filtering effect, so the filter screen is usually required to be detached and cleaned by using a special chemical agent. Due to the high concentration of chemicals, there is a residue of chemicals after cleaning.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a method for cleaning a filter, which can improve a cleaning effect and reduce chemical residues on the filter.

In order to achieve the above object, an embodiment of the present invention provides a method for cleaning a filter screen, including:

forward washing the filter screen with alkaline washing liquor; the alkaline washing liquid comprises an oil removing agent XDA 5;

the filter screen is reversely washed by acid washing liquid; the pickling solution comprises nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil;

rinsing the filter screen by using a rinsing liquid;

soaking the filter screen in a sodium hypochlorite solution;

and cleaning the filter screen by using demineralized water.

As an improvement of the scheme, the alkaline solution comprises 2-3% of alkaline solution diluted by an oil removal agent XDA5 and a defoaming agent added into the alkaline solution.

As an improvement of the scheme, the pickling solution comprises the following components in parts: 2-4 parts of 30% nitric acid, 0.5-1 part of 98% oxalic acid, 1-2.5 parts of 70% glycolic acid, 0.5-1 part of 50% hydroxyethylidene diphosphonic acid, 0.3-0.5 part of sulfated oil and 91-97 parts of water.

As an improvement of the scheme, the forward washing of the filter screen by the alkali washing liquid comprises the following steps:

and (3) positively washing the filter screen by using an alkaline washing liquid with the temperature of 30-40 ℃ by using a water pump, and then positively washing the filter screen by using clear water.

As an improvement of the above scheme, the back flushing of the filter screen by the pickling solution comprises:

the pickling solution is used for back flushing the filter screen through a water pump of the ultrafiltration system; during the cleaning process, the pressure difference of the ultrafiltration system across the filter screen is reduced from 0.2MPa at the beginning of washing to 0.05MPa at the end of washing, and the water production flow of the ultrafiltration system is increased from 120m3/h at the beginning of washing to 180m3/h at the end of washing.

As an improvement of the scheme, the water flow of the back flushing is 2-4 times of the filtering flow of the ultrafiltration system.

As an improvement of the scheme, the rinsing liquid comprises 0.1-0.3% of citric acid solution, 0.1% of citric acid corrosion inhibitor and 0.05% of EDTA (ethylene diamine tetraacetic acid) which is a rinsing aid.

As an improvement of the scheme, the H value of the rinsing liquid is 3-3.5, the rinsing temperature of the rinsing liquid to the filter screen is 55-60 ℃, and the rinsing time is 2 hours.

As an improvement of the scheme, the concentration of the sodium hypochlorite in the sodium hypochlorite solution is 1.5%; the soaking time of the filter screen in the sodium hypochlorite solution is 1 hour.

Compared with the prior art, according to the filter screen cleaning method provided by the embodiment of the invention, the alkaline washing solution containing the oil removal agent XDA5 is adopted to carry out forward washing on the filter screen, so that particle impurities attached to the filter screen can be effectively cleaned, and the acid washing solution containing nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil is adopted to carry out backward washing on the filter screen, so that organic matters attached to the filter screen can be effectively cleaned. Then the reuse rinsing liquid rinses the filter screen, can wash away the remaining pickle of filter screen like this, then soak with sodium hypochlorite solution the filter screen washs with the demineralized water at last the filter screen can effectually wash away the remaining various chemical agent of filter screen like this. In addition, the filter screen is flushed in the positive direction, so that the filter screen does not need to be detached and cleaned by chemical agents, and the operation is convenient.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a process flow diagram according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a method for cleaning a filter screen, including:

s10, washing the filter screen in the forward direction by alkali washing liquor; the alkaline washing liquid comprises an oil removing agent XDA 5;

s11, back washing the filter screen by using a pickling solution; the pickling solution comprises nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil;

s12, rinsing the filter screen by using a rinsing liquid;

s13, soaking the filter screen in a sodium hypochlorite solution;

s14, washing the filter screen by using demineralized water.

Compared with the prior art, according to the filter screen cleaning method provided by the embodiment of the invention, the alkaline washing solution containing the oil removal agent XDA5 is adopted to carry out forward washing on the filter screen, so that particle impurities attached to the filter screen can be effectively cleaned, and the acid washing solution containing nitric acid, oxalic acid, glycolic acid, hydroxyethylidene diphosphonic acid and sulfated oil is adopted to carry out backward washing on the filter screen, so that organic matters attached to the filter screen can be effectively cleaned. Then the reuse rinsing liquid rinses the filter screen, can wash away the remaining pickle of filter screen like this, then soak with sodium hypochlorite solution the filter screen washs with the demineralized water at last the filter screen can effectually wash away the remaining various chemical agent of filter screen like this. In addition, the filter screen is flushed in the positive direction, so that the filter screen does not need to be detached and cleaned by chemical agents, and the operation is convenient.

As an improvement of the scheme, the alkaline solution comprises 2-3% of alkaline solution diluted by an oil removal agent XDA5 and a defoaming agent added into the alkaline solution. Therefore, the cleaning and alkali washing effects on the filter screen can be improved. The defoaming agent can eliminate foam in the alkaline washing liquid and reduce the influence of a large amount of foam generated by the alkaline washing liquid on the washing effect of the filter screen in the washing process. For example, the alkaline solution can be used for circularly cleaning the filter screen (an ultrafiltration system is used for circulating the alkaline solution) for 5 hours, and then the alkaline solution is emptied and washed by water until the pH value is less than or equal to 9, and the water quality is transparent.

As an improvement of the scheme, the pickling solution comprises the following components in parts: 2-4 parts of 30% nitric acid, 0.5-1 part of 98% oxalic acid, 1-2.5 parts of 70% glycolic acid, 0.5-1 part of 50% hydroxyethylidene diphosphonic acid, 0.3-0.5 part of sulfated oil and 91-97 parts of water. Therefore, the acid washing effect on the filter screen can be effectively improved.

As an improvement of the scheme, the forward washing of the filter screen by the alkali washing liquid comprises the following steps:

and (3) positively washing the filter screen by using an alkaline washing liquid with the temperature of 30-40 ℃ by using a water pump, and then positively washing the filter screen by using clear water. Therefore, the alkali washing effect on the filter screen can be improved.

As an improvement of the above scheme, the back flushing of the filter screen by the pickling solution comprises:

the pickling solution is used for back flushing the filter screen through a water pump of the ultrafiltration system; during the cleaning process, the pressure difference of the ultrafiltration system across the filter screen is reduced from 0.2MPa at the beginning of washing to 0.05MPa at the end of washing, and the water production flow of the ultrafiltration system is increased from 120m3/h at the beginning of washing to 180m3/h at the end of washing. This ensures that the organic matter of the filter screen can be removed better.

As an improvement of the scheme, the water flow of the back flushing is 2-4 times of the filtering flow of the ultrafiltration system. This can improve the removal effect of organic matter from the filter screen.

As an improvement of the scheme, the rinsing liquid comprises 0.1-0.3% of citric acid solution, 0.1% of citric acid corrosion inhibitor and 0.05% of EDTA (ethylene diamine tetraacetic acid) which is a rinsing aid. Thus, the filter screen can be well rinsed.

As an improvement of the scheme, the H value of the rinsing liquid is 3-3.5, the rinsing temperature of the rinsing liquid to the filter screen is 55-60 ℃, and the rinsing time is 2 hours (the rinsing liquid can be used for circularly cleaning the filter screen by using an ultrafiltration system). This can improve the rinsing effect on the filter screen.

As an improvement of the scheme, the concentration of the sodium hypochlorite in the sodium hypochlorite solution is 1.5%; the soaking time of the filter screen in the sodium hypochlorite solution is 1 hour. Therefore, the residual chemical agents on the filter screen can be better cleaned.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.