阅读说明：本技术 一种厨余废水资源化处理的方法及系统 (Method and system for resourceful treatment of kitchen waste water ) 是由 付强 陈国龙 张欣 郭玮 刘永超 卫广程 刘子健 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种厨余废水资源化处理的方法及系统,其方法为：将一部分厨余废水进行厌氧发酵产生沼气和沼液,采用沼液与另一部分厨余废水进行水质调节,将水质调节后混合液进行非厌氧工艺处理,沼气燃烧产生的能量用于非厌氧工艺处理的能量消耗。本发明将厌氧工艺与非厌氧工艺于一体,利用厌氧工艺产生的沼气能源解决非厌氧工艺高耗能问题,能够可持续、可循环的高效节能处理厨余废水。(The invention discloses a method and a system for resourceful treatment of kitchen waste water, wherein the method comprises the following steps: anaerobic fermentation is carried out on a part of kitchen waste water to generate biogas and biogas slurry, water quality adjustment is carried out on the biogas slurry and the other part of kitchen waste water, non-anaerobic process treatment is carried out on the mixed liquid after the water quality adjustment, and energy generated by biogas combustion is used for energy consumption of the non-anaerobic process treatment. The invention integrates the anaerobic process and the non-anaerobic process, solves the problem of high energy consumption of the non-anaerobic process by utilizing the biogas energy generated by the anaerobic process, and can treat kitchen waste water in a sustainable and recyclable manner with high efficiency and energy saving.)

1. A method for resourceful treatment of kitchen waste water is characterized in that a part of kitchen waste water is subjected to anaerobic fermentation to generate biogas and biogas slurry, the biogas slurry and the other part of kitchen waste water are adopted for water quality adjustment, mixed liquid after the water quality adjustment is subjected to non-anaerobic process treatment, and energy generated by biogas combustion is used for energy consumption of the non-anaerobic process treatment.

2. The method as claimed in claim 1, wherein the waste water is composted using waste heat generated by non-anaerobic process.

3. The method for recycling kitchen waste water according to claim 2, wherein said composting comprises: carrying out biological drying on the discharged sludge and the concentrated solution, and then carrying out biological evaporation;

or mixing the discharged sludge and the biogas residues and then carrying out composting treatment.

4. The method as claimed in claim 1, wherein the non-anaerobic treatment comprises: and (3) performing primary coagulating sedimentation on the mixed solution after the water quality is adjusted, performing distillation treatment on effluent of the primary coagulating sedimentation to generate distillate, and performing nitrification and denitrification treatment on the distillate.

5. The method as set forth in claim 4, wherein the effluent after the nitrification and denitrification treatment is subjected to a secondary coagulating sedimentation.

6. A system for resourceful treatment of kitchen waste water is characterized by comprising:

a non-anaerobic treatment unit for non-anaerobic treatment;

the anaerobic fermentation device is used for anaerobic fermentation treatment of the kitchen waste water;

the non-anaerobic adjusting tank is used for adjusting the water quality of the kitchen waste water and the biogas slurry generated by the anaerobic fermentation device and conveying the waste water after the water quality is adjusted to the non-anaerobic treatment unit;

and the biogas combustion device is used for converting biogas generated by the anaerobic fermentation device into heat energy and applying the generated heat energy to the non-anaerobic treatment unit.

7. The system as claimed in claim 6, which includes a composting unit, wherein the sludge and the concentrated solution generated by the non-anaerobic treatment unit are transported to the composting unit;

preferably, the compost treatment unit sequentially comprises a biological drying sludge device and a biological evaporation device according to the material flow direction, and the waste heat generated by the non-anaerobic treatment unit provides heat for the biological drying sludge device and the biological evaporation device respectively.

8. The system as set forth in claim 6, comprising a collecting tank for collecting the kitchen waste water, wherein an outlet of the collecting tank is connected to the anaerobic fermentation device and the non-anaerobic adjusting tank.

9. The system as claimed in claim 6, wherein the non-anaerobic treatment unit comprises a primary coagulation sedimentation device, a distillation still and a synchronous nitrification-denitrification reactor connected in sequence according to the water flow direction.

10. The system for recycling kitchen waste water according to claim 6, wherein a water outlet of the synchronous nitrification and denitrification reactor is connected with a secondary coagulating sedimentation device;

or the water outlet of the secondary coagulating sedimentation equipment is connected with the carbon filter reactor.

Technical Field

The invention belongs to the technical field of wastewater treatment, relates to a treatment technology of kitchen waste water, and particularly relates to a method and a system for resourceful treatment of kitchen waste water.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The kitchen waste water is domestic waste formed in the living process of residents, the content of organic matters in all pollutants is highest, the content of suspended solids can reach 15000-30000 mg/L, and the content of COD can reach 180000 mg/L. According to the research of the inventor, the current treatment method of kitchen waste water mainly comprises an anaerobic process and a non-anaerobic process, and the anaerobic process requires large floor area and high investment cost, and the towns are short in land supply and low in income, so that the anaerobic process is difficult to be applied to practical treatment in some areas, namely, the kitchen waste water can be treated only by the non-anaerobic process in part of the areas at present. However, the inventor researches and discovers that the non-anaerobic process needs multi-stage treatment processes in the process of treating the kitchen waste water, and the treatment processes consume a large amount of medicaments and electric power, so that the treatment cost is far higher than the market acceptable cost.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a method and a system for recycling kitchen waste water, which can be used for treating the kitchen waste water in a sustainable, recyclable, efficient and energy-saving manner.

In order to achieve the purpose, the technical scheme of the invention is as follows:

on the one hand, the kitchen waste water recycling treatment method comprises the steps of carrying out anaerobic fermentation on one part of kitchen waste water to generate biogas and biogas slurry, adopting the biogas slurry and the other part of kitchen waste water to carry out water quality regulation, carrying out non-anaerobic process treatment on mixed liquid after the water quality regulation, and using energy generated by biogas combustion for energy consumption of the non-anaerobic process treatment.

In order to reduce the energy consumption and the medicament consumption of the non-anaerobic process, the invention adopts anaerobic fermentation to generate the biogas, is favorable for the energy generated by biogas combustion to be used for the energy consumption of the non-anaerobic process treatment, and can greatly reduce the use of external electric power, thereby greatly reducing the energy consumption and saving the medicament. However, there are several combinations in the combination of anaerobic fermentation with non-anaerobic processes. For example, kitchen waste water is distilled and concentrated firstly and then is subjected to anaerobic fermentation, but the distillate distilled in the mode has low COD load, so that the anaerobic fermentation gas production rate is low, the energy required by distillation is difficult to meet, the power consumption is still required, and the remarkable reduction of the energy consumption cannot be realized. For example, all kitchen waste water is subjected to anaerobic fermentation and then non-anaerobic treatment, but the treatment mode has high requirement on the occupied area of anaerobic fermentation and large investment, and is difficult to realize aiming at the current situation that the supply area of cities and towns is short.

The invention divides the kitchen waste water into two parts, one part is subjected to anaerobic fermentation, and the methane is mainly generated for energy consumption of non-anaerobic process treatment, so that the anaerobic fermentation is added as an energy supply device, the floor space requirement is reduced, and the investment is reduced. In addition, the water quality is adjusted through the biogas slurry and the kitchen waste water, so that the problem of large energy consumption caused by uneven water quality can be avoided, and the occupied area requirement of anaerobic fermentation is further reduced.

Because the concentrate produced in the non-anaerobic process cannot be discharged, in some embodiments, the waste heat generated by the non-anaerobic process is utilized to compost the produced sludge and concentrate.

In another aspect, a system for resourceful treatment of kitchen waste water comprises:

a non-anaerobic treatment unit for non-anaerobic treatment;

the anaerobic fermentation device is used for anaerobic fermentation treatment of the kitchen waste water;

the non-anaerobic adjusting tank is used for adjusting the water quality of the kitchen waste water and the biogas slurry generated by the anaerobic fermentation device and conveying the waste water after the water quality is adjusted to the non-anaerobic treatment unit;

and the biogas combustion device is used for converting biogas generated by the anaerobic fermentation device into heat energy and applying the generated heat energy to the non-anaerobic treatment unit.

The invention has the beneficial effects that:

1. the invention integrates the anaerobic process and the non-anaerobic process, and solves the problem of high energy consumption of the non-anaerobic process by utilizing the biogas energy generated by the anaerobic process.

2. The invention utilizes the waste heat generated by the non-anaerobic process to carry out the composting high-efficiency treatment of the system sludge discharge; and the concentrated solution generated in the distillation process is subjected to resourceful treatment by utilizing a compost high-efficiency treatment system, so that zero discharge of sludge and concentrated solution in kitchen waste water treatment is realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a flowchart of a method for resourceful treatment of kitchen waste water according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a system for resourceful treatment of kitchen waste water according to an embodiment of the present invention;

the system comprises a water collecting tank 1, a water collecting tank 2, an anaerobic adjusting tank 3, a non-anaerobic adjusting tank 4, an anaerobic fermentation device 5, a primary coagulating sedimentation device 6, a distillation still 7, a synchronous nitrification and denitrification reactor 8, a secondary coagulating sedimentation device 9, a carbon filter reactor 10, a sludge buffer tank 11, a biological drying sludge device 12, a biological evaporation device 13, a methane collecting device 14 and a boiler.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The invention provides a method and a system for resourceful treatment of kitchen waste water, aiming at the problem that a large amount of chemicals and electric power are consumed in the existing non-anaerobic process treatment of the kitchen waste water.

The invention provides a typical embodiment of a kitchen waste water recycling treatment method, which comprises the steps of carrying out anaerobic fermentation on a part of kitchen waste water to generate biogas and biogas slurry, adopting the biogas slurry and the other part of kitchen waste water to carry out water quality regulation, carrying out non-anaerobic process treatment on mixed liquid after the water quality regulation, and using energy generated by biogas combustion for energy consumption of the non-anaerobic process treatment.

The invention divides the kitchen waste water into two parts, one part is subjected to anaerobic fermentation, and the methane is mainly generated for energy consumption of non-anaerobic process treatment, so that the anaerobic fermentation is added as an energy supply device, the floor space requirement is reduced, and the investment is reduced. In addition, the water quality is adjusted through the biogas slurry and the kitchen waste water, so that the problem of large energy consumption caused by uneven water quality can be avoided, and the occupied area requirement of anaerobic fermentation is further reduced.

In some examples of this embodiment, the resulting sludge and concentrate are composted using waste heat from non-anaerobic processes. The concentrated solution contains pollutants such as COD, total nitrogen, total phosphorus, full salt and the like which are higher than those of raw water, so that the concentrated solution cannot be directly discharged, further treatment is required, the treatment operation is complex, and the cost is higher. The invention utilizes the concentrated solution as the raw material for composting, not only realizes high-value utilization of waste, but also can realize zero discharge, thereby realizing sustainable, recyclable, high-efficiency and energy-saving treatment of kitchen waste water. In addition, because the efficiency of composting treatment of sludge and concentrated solution at normal temperature is low, and the treatment effect is unstable, in order to increase the treatment effect of sludge and concentrated solution and realize zero emission, the composting treatment needs to be heated and heat-preserved. The invention is beneficial to carrying out biological evaporation treatment on the waste heat formed by a non-anaerobic process, not only ensures the high-efficiency operation of composting treatment and realizes the zero discharge of process sludge discharge and concentrated solution, but also recycles the waste heat, realizes the cascade utilization of energy generated by biogas combustion, reduces the energy consumption and saves the cost. In one or more embodiments, the composting process is: the discharged sludge and the concentrated solution are first biologically dried and then biologically evaporated.

In one or more embodiments, the sludge is mixed with the biogas residue and then composted.

In some embodiments of this embodiment, the treatment of the non-anaerobic process comprises: and (3) performing primary coagulating sedimentation on the mixed solution after the water quality is adjusted, performing distillation treatment on effluent of the primary coagulating sedimentation to generate distillate, and performing nitrification and denitrification treatment on the distillate. The solid suspended matters can be removed by adopting the coagulating sedimentation, then COD and ammonia nitrogen in the kitchen waste water are enriched by distillation, and then nitrification and denitrification treatment are carried out. The distillation process produces a distillate and a concentrate.

In one or more embodiments, the effluent after nitrification and denitrification is subjected to secondary coagulating sedimentation. Further removing pollutants in the water. The effluent quality can be better than the third-level discharge standard or reach the first-level A discharge standard. And filtering the effluent after the secondary coagulating sedimentation to remove fine pollutants in the water. During filtering, the active carbon is adopted for adsorption and filtration, so that the stability of the effluent quality can be further ensured to reach the standard. Sludge discharged from the coagulation sedimentation and the nitrification and denitrification is sludge discharge. The coagulating sedimentation refers to primary coagulating sedimentation and/or secondary coagulating sedimentation.

In another embodiment of the present invention, a system for recycling kitchen waste water is provided, which includes:

a non-anaerobic treatment unit for non-anaerobic treatment;

the anaerobic fermentation device is used for anaerobic fermentation treatment of the kitchen waste water;

the non-anaerobic adjusting tank is used for adjusting the water quality of the kitchen waste water and the biogas slurry generated by the anaerobic fermentation device and conveying the waste water after the water quality is adjusted to the non-anaerobic treatment unit;

and the biogas combustion device is used for converting biogas generated by the anaerobic fermentation device into heat energy and applying the generated heat energy to the non-anaerobic treatment unit.

Some examples of this embodiment include a composting unit to which sludge and concentrate from a non-anaerobic treatment unit is delivered.

In one or more embodiments, the composting unit sequentially comprises a biological drying sludge device and a biological evaporation device according to the material flow direction, and the waste heat generated by the non-anaerobic treatment unit provides heat for the biological drying sludge device and the biological evaporation device respectively.

Some examples of this embodiment include a catch basin for collecting kitchen waste water, the outlet of the catch basin being connected to the anaerobic fermentation device and the non-anaerobic conditioning tank.

In some examples of this embodiment, the non-anaerobic treatment unit comprises a primary coagulating sedimentation device, a distillation still and a synchronous nitrification-denitrification reactor which are connected in sequence according to the water flow direction.

In one or more embodiments, the water outlet of the synchronous nitrification and denitrification reactor is connected with a secondary coagulating sedimentation device. The secondary coagulation and sedimentation can make the water quality of the outlet water better than the third-level discharge standard or reach the first-level A discharge standard.

In one or more embodiments, the water outlet of the secondary coagulating sedimentation device is connected with the carbon filter reactor.

In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.

Examples

A method for resourceful treatment of kitchen waste water is disclosed, as shown in figure 1, kitchen waste water firstly enters a collecting tank, the kitchen waste water automatically flows into the collecting tank, then the waste water in the collecting tank is pumped into an adjusting tank 1 and an adjusting tank 2 through a pump, the water quality is adjusted in the adjusting tank, and the water quality entering a subsequent system is uniform, and the process further comprises the following steps:

(1) kitchen waste water flows into the water collecting tank, and is pumped into the filtering equipment through the pump so as to further remove suspended substances with larger particle sizes in the kitchen waste water, so that the blockage of subsequent anaerobic equipment is prevented, and the subsequent coagulation sedimentation reaction is facilitated.

(2) One part of the kitchen waste water filtered by the filtering equipment enters the regulating tank 1, the other part of the kitchen waste water enters the regulating tank 2, and the water quality is regulated in the two regulating tanks, so that the water quality is uniform.

(3) A part of the wastewater adjusted by the adjusting tank 1 is pumped into an anaerobic reactor by a pump at a certain designed flow rate to carry out anaerobic fermentation and methane production reaction, and methane produced by the anaerobic reaction enters methane collection equipment; the other part is pumped into the adjusting tank 2 by a pump at a certain designed flow rate, and the water quality and the water quantity are adjusted in the adjusting tank 2 together with the biogas slurry generated by anaerobic fermentation, so that the water quality is uniform.

(4) And pumping the wastewater in the regulating tank 2 into the coagulating sedimentation integrated equipment by a pump at a certain designed flow rate to perform coagulating sedimentation reaction.

(5) And (3) feeding the coagulating sedimentation effluent into a distillation still for distillation treatment of wastewater, separating wastewater fractions through intermittent distillation, wherein the distilled fractions are easy to carry out subsequent biochemical treatment, and feeding the distilled concentrated solution into a biological evaporation device for biological evaporation treatment. Methane generated by anaerobic fermentation is used for heat source supply of the distillation still so as to reduce the overall treatment cost of kitchen waste water.

(6) The heat supply of the biological evaporation device is from a waste heat system of the distillation still.

(7) The distilled fraction enters a synchronous nitrification and denitrification reactor, an ore filler is arranged in the reactor, nitrification reaction is carried out on the outer surface of the ore filler under the action of nitrifying bacteria, denitrification reaction is carried out in the ore filler under the action of denitrifying bacteria, and COD and ammonia nitrogen in the fraction are removed.

(8) And the effluent of the synchronous nitrification and denitrification reactor enters the coagulating sedimentation integrated equipment to further remove pollutants in the water, so that the quality of the effluent is superior to the third-level discharge standard or reaches the first-level A discharge standard.

(9) And pumping the effluent of the coagulation and precipitation integrated equipment into a carbon filter reactor, and further ensuring the quality of the effluent to reach the standard through the adsorption effect of the activated carbon.

And (3) pumping biogas residues generated by anaerobic fermentation into a sludge buffer tank, and uniformly mixing the biogas residues with the sludge generated in the steps (4), (7) and (8) in the sludge storage tank, so that the biogas residues are more favorable for composting.

Pumping the mixed sludge in the sludge storage tank into a biological sludge drying device for biological drying treatment of the sludge, and preparing the biological dried sludge to be used as continuous filler for a biological evaporation device for supply.

In the step (5), the biological evaporation device can regularly discharge a certain amount of high-efficiency organic fertilizer in the treatment process, and the biological evaporation device can be used as a growth organic fertilizer for crops.

And (4) the heat source used by the biochemical sludge drying equipment is the residual heat generated in the distillation process of the distillation kettle in the step (5).

According to the method, a system for recycling kitchen waste water is provided, as shown in fig. 2. Comprises a water collecting tank 1, wherein the water outlet of the water collecting tank 1 is simultaneously connected with an anaerobic adjusting tank 2 and a non-anaerobic adjusting tank 3. The water outlet of the anaerobic adjusting tank 2 is connected with an anaerobic fermentation device 4, and the liquid outlet of the anaerobic fermentation device 4 is connected with a non-anaerobic adjusting tank 3. The water outlet of the non-anaerobic adjusting tank 3 is connected with a primary coagulating sedimentation device 5. The water outlet of the primary coagulating sedimentation equipment 5 is provided with a water outlet flow direction which is sequentially connected with a distillation still 6, a synchronous nitrification and denitrification reactor 7, a secondary coagulating sedimentation equipment 8 and a carbon filter reactor 9. The biogas residue outlet of the anaerobic fermentation device 4, the sludge discharge outlet of the primary coagulation sedimentation device 5, the sludge discharge outlet of the synchronous nitrification and denitrification reactor 7 and the sludge discharge outlet of the secondary coagulation sedimentation device 8 are connected with a sludge buffer tank 10. The sludge buffer tank 10 is connected with a biological drying sludge device 11 and a biological evaporation device 12 in sequence. The gas phase outlet of the anaerobic fermentation device 4 is connected with a methane collecting device 13. The methane collection device 13 delivers methane to a boiler 14, which generates energy for heating the still pot 6. The waste heat generated by the heating distillation kettle 6 respectively heats the biological drying sludge device 11 and the biological evaporation device 12.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.