CN111847809A - A kind of kitchen waste fermentation wastewater treatment device and method - Google Patents

Abstract

The invention relates to a kitchen waste fermentation wastewater treatment device and a method, wherein the kitchen waste fermentation wastewater treatment device is an integrated reactor and comprises the following components: an anoxic-negative pressure stripping treatment area, an aerobic biological treatment area and a coagulating sedimentation area which are connected in sequence; wherein, part of nitrified liquid in the aerobic biological treatment area flows back to the anoxic-negative pressure stripping treatment area; chemical sludge generated in the coagulating sedimentation area is periodically removed. The invention provides an anoxic-negative pressure stripping treatment method for high-temperature high-ammonia nitrogen kitchen waste fermentation wastewater, improves pH through anoxic denitrification, further adopts negative pressure stripping ammonia nitrogen, greatly improves the ammonia nitrogen treatment efficiency of the wastewater, and solves the problems of inhibition of high ammonia nitrogen on microorganisms in a biological treatment system, long residence time, high energy consumption and insufficient denitrification carbon source in the nitrification process of the high ammonia nitrogen wastewater; meanwhile, a membrane treatment process is replaced by a coagulating sedimentation process, so that the investment and cost for treating the kitchen wastewater are greatly reduced. The effluent can reach the standard of GB 16889-.

Description

A kind of kitchen waste fermentation wastewater treatment device and method

technical field

The invention relates to the technical field of sewage treatment and environmental protection, in particular to a device and method for treating kitchen waste fermentation wastewater.

Background technique

At present, kitchen waste fermentation wastewater treatment facilities have low treatment efficiency, large investment, high operating costs, complex operation and management, and biological treatment processes are easily affected by kitchen waste fermentation wastewater.

Inhibition of high temperature and high ammonia nitrogen. In recent years, the treatment methods and device technologies for kitchen waste fermentation wastewater have developed rapidly, such as CN107311403A "Kitchen Waste Fermentation Wastewater Treatment Device", CN107352745A "Food Waste Fermentation Wastewater Treatment Method", etc. The combined process of "oil separation and primary sedimentation - water quantity, water quality adjustment - A/O biochemical treatment - sedimentation - first coagulation sedimentation - Fenton reaction - second coagulation sedimentation - aeration biological filter" is adopted, but for meals For kitchen waste fermentation wastewater treatment, there are many problems such as many process units, long process flow, low treatment efficiency, high investment and operating costs, large floor space, and complex operation and management.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kitchen waste fermentation wastewater treatment device and method. By integrating ammonia nitrogen negative pressure stripping, the treatment efficiency of high temperature and high ammonia nitrogen kitchen waste fermentation wastewater is greatly improved, and the effect of high ammonia nitrogen on the fermentation wastewater is effectively slowed down. The inhibition of microorganisms in the subsequent biological treatment system solves the problems of long residence time and high energy consumption in the nitrification process of high ammonia nitrogen wastewater, and the lack of carbon sources for denitrification of the wastewater, and the system has high denitrification efficiency; at the same time, coagulation sedimentation is used instead of membrane treatment. Further removal of organic matter and improved sludge settling performance. The device has short technological process, high processing efficiency, low investment and processing cost, and good application prospect.

The technical scheme of the present invention is:

The invention provides a kitchen waste fermentation wastewater treatment device, comprising:

The reactor, including: anoxic-negative pressure stripping treatment zone, aerobic biological treatment zone and coagulation sedimentation zone connected in sequence;

Wherein, part of the nitrification solution at the end of the aerobic biological treatment zone is returned to the anoxic-negative pressure stripping treatment zone through the nitrification solution return pipe;

The chemical sludge in the coagulation and sedimentation zone is regularly discharged through a sludge discharge pipe, and the sludge discharge pipe is provided with a first solenoid valve for controlling the sludge discharge.

Preferably, the anoxic-negative pressure stripping treatment zone is divided into an airtight anoxic treatment zone and a negative pressure device by a first partition wall;

A negative pressure stripping device and an ammonia nitrogen absorption device are installed in the negative pressure device room;

The negative pressure stripping device is connected to the anoxic treatment zone through a negative pressure suction pipe, and the negative pressure stripping device is used to form a negative pressure stripping in the anoxic treatment zone;

The ammonia nitrogen absorption device is connected to the anoxic treatment area through an ammonia gas absorption pipe, and the ammonia nitrogen absorption device is used for the ammonia gas generated during the negative pressure stripping in the anoxic treatment area;

The anoxic treatment area is divided into two parallel groups of anoxic treatment areas by the second partition wall, and the sequence batch operation conditions adopted by each group of anoxic treatment areas are specifically: water inflow - anoxic - negative pressure stripping - precipitation - effluent;

A first combined filler is arranged in the anoxic treatment zone;

Controlled by the second solenoid valve, the effluent at the end of the anoxic treatment zone is sucked by an outlet pump, and flows into the aerobic biological treatment zone through a water inlet pipe.

Preferably, an exhaust valve is provided at the top of the anoxic treatment zone.

Preferably, the aerobic biological treatment zone is divided into an aerobic treatment zone and a place where the blower is placed by a third partition wall;

A blower is placed in the blower placement room;

A microporous aerator is arranged in the sewage in the aerobic treatment zone, and the blower is communicated with the microporous aerator through an air pipe;

A second combined filler is arranged in the aerobic treatment zone;

A part of the effluent at the end of the aerobic treatment zone is returned to the front end of the anoxic treatment zone through the reflux pump provided on the nitrification solution return pipe;

Another part of the effluent at the end of the aerobic treatment zone enters the coagulation and sedimentation zone through a water outlet pipe.

Preferably, the coagulation and sedimentation area is divided into a coagulation and sedimentation treatment area and a dissolving and dosing treatment room by a fourth partition wall;

A drug dissolving pool and a metering pump are arranged in the drug dissolving and dosing room, and a coagulant is dissolved in the drug dissolving pool. The incoming water is coagulated;

The coagulated sewage is sedimented through the inclined plate set in the middle of the coagulation and sedimentation treatment area;

The chemical sludge produced after precipitation is regularly discharged through the sludge discharge pipe arranged at the bottom of the coagulation and sedimentation treatment zone;

The treated water produced after the precipitation is discharged through the drainage pipe provided in the upper part of the coagulation and precipitation treatment area.

Preferably, the first combined filler and the second combined filler are composed of polypropylene plastic rings and aldehyde fibers.

Preferably, the anoxic-negative pressure stripping treatment zone and the aerobic biological treatment zone are separated by a fifth partition wall, and the aerobic biological treatment zone and the coagulation sedimentation zone are separated by a sixth partition wall separated.

The present invention also provides a method for treating kitchen waste fermentation wastewater, which is applied to the above-mentioned kitchen garbage fermentation wastewater treatment device, and the method includes:

Step S1, anoxic-stripping treatment: the pretreated food waste fermentation wastewater and the nitrifying solution returned from the aerobic treatment area are respectively and synchronously entered into the two groups of anoxic treatment areas through the opening and closing control of the water inlet solenoid valve. Carry out anoxic denitrification, convert nitrate nitrogen in sewage into nitrogen gas, and increase the pH value in the anoxic treatment area; and then carry out negative pressure blowing of ammonia nitrogen in the anoxic treatment area through the negative pressure stripping device. At the same time, the ammonia nitrogen produced by the stripping in the two groups of anoxic treatment areas is absorbed by the ammonia nitrogen absorption device;

Step S2, aerobic biological treatment: the sewage after anoxic-stripping treatment respectively forms a continuous flow and enters the aerobic treatment zone for aerobic nitrification. conveying air;

Step S3, coagulation and sedimentation treatment: the sewage that has undergone aerobic nitrification enters the coagulation and sedimentation treatment zone, and the coagulant is put into the coagulation and sedimentation zone to perform coagulation treatment on the sewage, and the coagulated sewage is subjected to sedimentation. ; After precipitation treatment, the waste water in the upper part is discharged, and the sludge in the lower part is discharged.

The advantages of the device of the present invention are as follows:

①. The combined system of biological treatment and ammonia nitrogen negative pressure stripping has high denitrification efficiency and low energy consumption, which is beneficial to the recovery of ammonia nitrogen resources

The device adopts a biofilm process reactor, which has a high concentration of microorganisms and strong shock load resistance. The combination of negative pressure stripping and anoxic biological denitrification increases the pH of the system while denitrifying and denitrifying. The absorption device recovers the stripped ammonia nitrogen; eliminates the inhibition of high-concentration ammonia nitrogen to microorganisms in the aerobic treatment area, and at the same time greatly reduces the ammonia nitrogen load, residence time and aeration energy consumption in the aerobic treatment area.

②. Short process flow, low investment and easy management

On the one hand, the device integrates the process units such as anoxic treatment area, aerobic treatment area, and coagulation and sedimentation treatment area, and integrates the negative pressure device room, the blower placement room, and the dissolving drug dosing room with the treatment area; On the one hand, after the high-temperature and high-ammonia-nitrogen wastewater is stripped, the ammonia-nitrogen load of biological treatment is greatly reduced, which greatly reduces the volume of the anoxic treatment area and the aerobic treatment area, saving investment and land occupation. In addition, the reactor adopts coagulation and sedimentation process to replace the existing membrane treatment process of kitchen fermentation wastewater, which greatly reduces the energy consumption of system operation and simplifies operation management.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of the present invention;

Description of reference numerals: 1. Anoxic treatment area; 2. Aerobic treatment area; 3. Coagulation and sedimentation treatment area; 4. Negative pressure device room; 5. Blower placement room; Main water inlet pipe; 8. Drain pipe; 9. Water inlet pipe; 10. Nitrification liquid return pipe; 11. Negative pressure suction pipe; 12. Ammonia gas absorption pipe; 13. Air pipe; 14. Dosing pipe; 15. Water inlet Solenoid valve; 16, third solenoid valve; 17, suction pipe gate valve; 18, absorption pipe gate valve; 19, second solenoid valve; 20, first solenoid valve; 21, return pump; 22, outlet water pump; 23, negative Pressure stripping device; 24, ammonia nitrogen absorption device; 25, blower; 26, dissolving pool; 27, metering pump; 28, first combined packing; 29, second combined packing; 30, exhaust valve; 31, microporous aerator; 32, mechanical stirring device; 33, first partition wall; 38, second partition wall; 36, third partition wall; 37, fourth partition wall; 34, fifth partition wall; 35, sixth partition wall; 39. Mud pipe.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.

1 and 2, an embodiment of the present invention provides a kitchen waste fermentation wastewater treatment device, the device is an integrated reactor, and specifically includes:

The reactor, including: anoxic-negative pressure stripping treatment zone, aerobic biological treatment zone and coagulation sedimentation zone connected in sequence;

Wherein, part of the nitrification liquid in the aerobic biological treatment zone is returned to the anoxic-negative pressure stripping treatment zone through the nitrification liquid return pipe 10; discharge.

In the anoxic-negative pressure stripping treatment zone, the nitrate nitrogen in the nitrifying solution returned from the aerobic biological treatment zone is converted into nitrogen by denitrifying bacteria. At the same time, denitrification increases the pH in the anoxic-negative pressure stripping treatment zone. , which promotes the ammonia nitrogen stripping and recovery of the high temperature and high ammonia nitrogen wastewater in the anoxic-negative pressure stripping treatment zone.

The aerobic biological treatment zone nitrifies and degrades the ammonia nitrogen in the effluent from the anoxic-negative pressure stripping treatment zone.

The coagulation and sedimentation area further coagulates the refractory organic matter in the effluent of the aerobic biological treatment area, so that the effluent meets the requirements specified in Table 2 of the "Control Standards for Domestic Waste Landfills" (GB 16889-2008). The above-mentioned device of the present invention has the advantages of low cost, high processing efficiency, short process, less land occupation, low investment, convenient management and the like.

Specifically, referring to FIG. 1 , the anoxic-negative pressure stripping treatment area is separated into an airtight anoxic treatment area 1 and a negative pressure device room 4 by a first partition wall 33; The device has a negative pressure stripping device 23 and an ammonia nitrogen absorption device 24; the negative pressure stripping device 23 is connected to the anoxic treatment zone 1 through a negative pressure suction pipe 11, and a suction pipe gate valve is set on the negative pressure suction pipe 11 17, so that negative pressure stripping is formed in the two groups of anoxic treatment zones 1 respectively; the ammonia nitrogen absorption device 24 communicates with the anoxic treatment zone 1 through the ammonia gas absorption pipe 12, and the ammonia gas absorption pipe 12 is provided with absorption The pipe gate valve 18, the ammonia nitrogen absorption device 24 is used for the two groups of anoxic treatment zones 1 to absorb the ammonia gas generated respectively during negative pressure stripping; the anoxic treatment zone 1 is provided with a first combined filler 28; Controlled by the second solenoid valve 19 , the effluent water at the end of the anoxic treatment zone 1 is pumped into the aerobic biological treatment zone through the outlet pump 22 provided on the water inlet pipe 9 .

The first combined filler 28 arranged in the anoxic treatment zone 1 is composed of polypropylene plastic rings and formaldehyde fibers, and the first combined filler 28 is used for the fixation of denitrifying bacteria.

Anoxic treatment zone 1 adopts two sets of parallel settings to run in a sequential batch mode (water inflow - anoxic denitrification - negative pressure stripping - precipitation - effluent). Specifically, the kitchen waste fermentation wastewater first passes through the pretreatment tank for oil separation and removal of inorganic sand and some suspended solids, and then enters the two groups of anoxic treatment in turn through the main water inlet pipe 7 and the opening and closing control of the water inlet solenoid valve 15. In zone 1, at the same time, the nitrification solution after aerobic nitrification treatment from the aerobic microbial treatment zone is returned to the two groups of anoxic treatment zones 1 through the nitrification solution return pipe 10. Under anoxic conditions, the anoxic treatment zone 1 The denitrifying bacteria use the carbon source in the kitchen fermentation wastewater to carry out denitrification treatment, convert nitrate nitrogen into nitrogen gas, and at the same time, increase the pH value in the anoxic treatment zone 1, and the increase in pH value can promote high temperature and high ammonia nitrogen Negative pressure stripping efficiency of ammonia nitrogen in kitchen fermentation wastewater. Then, the negative pressure stripping device 23 controls the anoxic treatment area 1 to perform negative pressure suction respectively through the suction pipe gate valve 17, so that a negative pressure stripping condition is formed in the anoxic treatment area 1, and the ammonia nitrogen in the sewage is stripped. During the negative pressure stripping, the ammonia nitrogen generated in the anoxic treatment zone 1 is respectively absorbed through the absorption pipe gate valve 18 controlled by the ammonia nitrogen absorption device 24 .

Referring to FIG. 1 , an exhaust valve 30 is provided on the top of the anoxic treatment area 1 to prevent the pressure difference in the anoxic treatment area 1 from being too large. When the pressure difference in the anoxic treatment area 1 is too large, the The gas in the anoxic treatment zone 1 is partially discharged, so that the pressure difference in the anoxic treatment zone is kept within the set pressure difference range.

1, the aerobic biological treatment zone is divided into aerobic treatment zone 2 and blower placement room 5 by the third partition wall 36; blower 25 is placed in the blower placement room 5; The sewage is provided with a microporous aerator 31, and the blower 25 communicates with the microporous aerator 31 through the air pipe 13. After the blower 25 is turned on, aeration is carried out into the aerobic treatment zone 2 through the microporous aerator 31. The aerobic treatment zone 2 is provided with a second combined filler 29; through the control of the third solenoid valve 16, a part of the effluent at the end of the aerobic treatment zone 2 passes through the reflux pump 21 provided on the nitrification solution return pipe 10 Return to the front end of the anoxic treatment zone 1; another part of the effluent at the end of the aerobic treatment zone 2 enters the coagulation and sedimentation zone.

When the aerobic biological treatment zone is working, the sewage is treated in the anoxic treatment zone 1 and then discharged into the aerobic treatment zone 2. The nitrifying bacteria in the aerobic treatment zone 2 undergo aerobic nitrification treatment to convert the ammonia nitrogen in the sewage into nitrate. Nitrogen and nitrate nitrogen are returned to the anoxic treatment zone 1 at the front end through the nitrification liquid return pipe 10 .

1 , the coagulation and sedimentation area is divided into a coagulation and sedimentation treatment area 3 and a drug-dissolving and dosing treatment room 6 by a third partition wall 37; The dissolving tank 26 is equipped with dissolved coagulant. The input amount of the coagulant 26 is calculated by the metering pump 27. The coagulant is injected into the waste water in the coagulation and sedimentation treatment area 3 through the dosing pipe 14 for coagulation treatment. The sewage after coagulation is precipitated by the inclined plate set in the middle of the coagulation and sedimentation treatment area 3, which shortens the sedimentation time and improves the sedimentation efficiency; The sludge pipe 39 is discharged. The sludge discharge pipe 39 is provided with a first solenoid valve 20 for controlling sludge discharge. Through the first solenoid valve 20, chemical sludge can be discharged regularly; It enters the upper end of the coagulation and sedimentation treatment area 3 , and the treated sewage is discharged through the water outlet pipe 8 .

1, the anoxic-negative pressure stripping treatment zone and the aerobic biological treatment zone are separated by a fifth partition wall 34, and the aerobic biological treatment zone and the coagulation sedimentation zone are separated by a sixth partition wall 34. A partition wall 35 separates them.

The water treatment process of this reactor is as follows: the anoxic treatment zone 1 where the sewage first enters in sequence, and the anoxic treatment zone 1 is operated in a sequential batch mode (water inlet - anoxic denitrification - negative pressure stripping - precipitation - effluent) mode . First, the denitrifying bacteria in the anti-anoxic treatment zone 1 use the organic matter in the influent water to convert the nitrate nitrogen returned from the aerobic treatment zone 2 to the anoxic treatment zone 1 into nitrogen gas, and the organic matter and nitrate nitrogen are biodegraded; At the same time, the increase of the alkalinity in the water can promote the negative pressure stripping efficiency of ammonia nitrogen in the high-temperature and high-ammonia-nitrogen kitchen fermentation wastewater, and the effluent ammonia-nitrogen concentration is greatly reduced, eliminating the inhibition of the microbial activity in the subsequent biological system caused by the high ammonia-nitrogen in the wastewater. Aerobic treatment zone 2 operates in a continuous flow mode with full aeration. The nitrifying bacteria in the aerobic treatment zone 2 further biodegrade the residual ammonia nitrogen in the sewage treated in the anoxic treatment zone 1, and the generated nitrate nitrogen is passed through the nitrifying solution by the reflux pump 21 at the end of the aerobic treatment zone 2. The return pipe 10 enters the anoxic treatment zone 1 for denitrification treatment.

The present invention adopts the biofilm treatment technology. By arranging the first combined filler 28 and the second combined filler 29 in the reactor, a biofilm treatment system is formed in the reactor, which has the characteristics of shock load resistance and strong adaptability, which is conducive to high efficiency Denitrogenation. At the same time, the reactor adopts the sequence batch operation, and the biological treatment efficiency of the system is guaranteed by the flexible adjustment of the operating conditions by controlling the operating conditions. The sewage treated in the aerobic treatment zone 2 enters the coagulation and sedimentation treatment zone 3, and the residual refractory organic matter, SS, chromaticity, etc. are further treated by a high-efficiency coagulant.

The present invention also provides a method for treating kitchen waste fermentation wastewater, which is applied to the above-mentioned kitchen garbage fermentation wastewater treatment device, and the method includes:

Step S1, anoxic-stripping treatment: the pretreated kitchen waste fermentation wastewater and the nitrifying solution returned from the aerobic treatment zone 2 are simultaneously entered into the two groups of anoxic treatment zones 1 for anoxic denitrification. The nitrate nitrogen in the sewage is converted into nitrogen, and the pH value in the anoxic treatment zone 1 is increased; then the negative pressure stripping device 23 is used to carry out the negative pressure stripping of ammonia nitrogen in the anoxic treatment zone 1, and at the same time, the ammonia nitrogen is passed through the ammonia nitrogen. The absorption device 24 absorbs the ammonia nitrogen generated in the anoxic treatment zone 1 .

The anoxic treatment zone 1 adopts the sequential batch mode (water inflow - anoxic denitrification - ammonia nitrogen negative pressure stripping - precipitation - effluent) cycle operation. The pretreated sewage and the nitrification liquid produced by the aerobic treatment zone 2 enter the anoxic treatment zone 1 provided with the first filler 28, and the denitrifying bacteria use the carbon source in the sewage under anoxic conditions. Anoxic denitrification is carried out to convert nitrate nitrogen into nitrogen, and at the same time, the pH of the anoxic zone increases; under the condition of negative pressure stripping, the high-temperature and high-ammonia-nitrogen wastewater is turned on by control, and the effluent is sucked by the effluent pump 22 and passed through The water inlet pipe 9 enters the aerobic treatment zone 2 .

Step S2, aerobic biological treatment: the sewage after anoxic-stripping treatment enters the aerobic treatment zone 2 for aerobic nitrification, and at the same time, the blower 25 is turned on to transport air to the microporous aerator 31 .

The blower 25 delivers air to the microporous aerator 31 through the air pipe 13 . Aerobic treatment zone 2 adopts continuous flow mode for the whole process of aerobic operation, ammonia nitrogen in sewage is converted into nitrate nitrogen by nitrifying bacteria, and returns to the front-end anoxic treatment zone 1; Ammonia nitrogen is blown out. A reflux pump 21 is set at the end of the aerobic treatment zone 2 to return the nitrate nitrogen to the front end of the anoxic treatment zone 1 through the nitrification liquid reflux pipe 10 for reflux treatment, and the effluent enters the coagulation and sedimentation treatment zone 3 for treatment.

Step S3, coagulation and sedimentation treatment: the sewage that has undergone aerobic nitrification enters into the coagulation and sedimentation treatment zone 3, and the coagulant is put into the coagulation and sedimentation treatment zone 3 for coagulation treatment of the sewage. The sewage is sedimented; after sedimentation treatment, the reclaimed water in the upper part is discharged, and the sludge in the lower part is discharged.

The sewage treated in the aerobic treatment zone 2 is subjected to coagulation and sedimentation treatment. The sewage is coagulated under the action of the coagulant and sedimented on the inclined plate set in the middle of the coagulation and sedimentation treatment zone 3 to further remove organic matter and phosphorus.

Compared with the prior art, the present invention has the following characteristics:

①The combined system of biological treatment and ammonia nitrogen negative pressure stripping has high denitrification efficiency and low energy consumption, which is beneficial to the recovery of ammonia nitrogen resources

The device adopts biofilm technology, which has high microbial concentration, strong shock load resistance and adaptability. Negative pressure stripping is combined with anoxic biological treatment and denitrification. In the anoxic-negative pressure stripping treatment area, the pH of the system is first increased by anoxic denitrification and denitrification, and then the negative pressure stripping is carried out for high temperature and high ammonia nitrogen kitchen fermentation. The ammonia nitrogen in the wastewater is recovered and stripped through the ammonia nitrogen absorption device; the concentration of ammonia nitrogen in the effluent is greatly reduced, eliminating the inhibition of the microorganisms in the aerobic biological treatment area due to the high concentration of ammonia nitrogen, and at the same time, greatly reducing the ammonia nitrogen load in the aerobic treatment area. Residence time and aeration energy consumption.

②Short process flow, low investment and easy management

③ On the one hand, the device integrates the process units such as anoxic treatment area, aerobic treatment area, and coagulation and sedimentation treatment area, and integrates the negative pressure device room, the blower placement room, and the dissolving drug dosing room with the treatment area; On the other hand, after the high temperature and high ammonia nitrogen wastewater is stripped, the ammonia nitrogen load of biological treatment is greatly reduced, which greatly reduces the volume of the anoxic treatment area and the aerobic treatment area, saving investment and land occupation. In addition, the coagulation and sedimentation process is used to replace the existing membrane treatment process of kitchen fermentation wastewater, which greatly reduces system investment, operation energy consumption, and simplifies operation management. The above-described embodiments describe only one or more embodiments of some of the present invention, but those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit and scope thereof. Accordingly, the examples and embodiments shown are to be regarded as illustrative and not restrictive, and various modifications are possible within the present invention without departing from the spirit and scope of the invention as defined by the appended claims. with replacement.

Claims (8)

1. a kitchen waste fermentation wastewater treatment device, is characterized in that, comprises: The reactor, including: anoxic-negative pressure stripping treatment zone, aerobic biological treatment zone and coagulation sedimentation zone connected in sequence; Wherein, part of the nitrification solution at the end of the aerobic biological treatment zone is returned to the anoxic-negative pressure stripping treatment zone through the nitrification solution return pipe (10); The chemical sludge in the coagulation and sedimentation zone is regularly discharged through a sludge discharge pipe (39), and the sludge discharge pipe (39) is provided with a first solenoid valve (20) for controlling sludge discharge. 2. The kitchen waste fermentation wastewater treatment device according to claim 1, characterized in that, The anoxic-negative pressure stripping treatment area is divided into a closed anoxic treatment area (1) and a negative pressure device room (4) by a first partition wall (33); A negative pressure stripping device (23) and an ammonia nitrogen absorption device (24) are installed in the negative pressure device room (4); The negative pressure stripping device (23) is connected to the anoxic treatment zone (1) through a negative pressure suction pipe (11), and the negative pressure stripping device (23) is used to make the anoxic treatment zone ( 1) Negative pressure blow-off is formed inside; The ammonia nitrogen absorption device (24) is connected to the anoxic treatment area (1) through an ammonia gas absorption pipe (12), and the ammonia nitrogen absorption device (24) is used for blowing the anoxic treatment area (1) under negative pressure. Ammonia gas generated during stripping; The anoxic treatment area (1) is divided into two parallel groups of anoxic treatment areas by the second partition wall (38). Oxygen-negative pressure stripping-precipitation-water; A first combined filler (28) is arranged in the anoxic treatment zone (1); Controlled by the second solenoid valve (19), the effluent at the end of the anoxic treatment zone (1) is pumped through the outlet pump (22), and flows into the aerobic biological treatment zone through the water inlet pipe (9). 3. The kitchen waste fermentation wastewater treatment device according to claim 2, characterized in that, an exhaust valve (30) is provided on the top of the anoxic treatment zone (1). 4. The kitchen waste fermentation wastewater treatment device according to claim 2, characterized in that, The aerobic biological treatment zone is divided into an aerobic treatment zone (2) and a blower placement room (5) by a third partition wall (36); A blower (25) is placed in the blower placement room (5); The sewage in the aerobic treatment zone (2) is provided with a microporous aerator (31), and the blower (25) communicates with the microporous aerator (31) through an air pipe (13); A second combined filler (29) is arranged in the aerobic treatment zone (2); A part of the effluent at the end of the aerobic treatment zone (2) is returned to the front end of the anoxic treatment zone (1) through the reflux pump (21) provided on the nitrification solution return pipe (10); Another part of the effluent at the end of the aerobic treatment zone (2) enters the coagulation and sedimentation zone. 5 . The food waste fermentation wastewater treatment device according to claim 4 , wherein the coagulation and sedimentation area is divided into a coagulation and sedimentation treatment area ( 3 ) and a drug-dissolving treatment area by a fourth partition wall ( 37 ). 6 . room (6); A medicine dissolving pool (26) and a metering pump (27) are arranged in the medicine dissolving and dosing room (6), and a coagulant is dissolved in the medicine dissolving pool (26), and the coagulant passes through the medicine administration pipe (14) put into the coagulation and sedimentation treatment zone (3) for coagulation treatment; A mechanical stirring device (32) is arranged in the coagulation and sedimentation treatment area (3), which is used for rapid coagulation of sewage, and the coagulated sewage is precipitated through the inclined plate arranged in the middle of the coagulation and sedimentation treatment area (3); The chemical sludge produced after precipitation is regularly discharged through the sludge discharge pipe (39) provided at the bottom of the coagulation and sedimentation treatment zone (3); The treated water produced after precipitation is discharged through the drainage pipe (8) provided in the upper part of the coagulation and precipitation treatment area (3). 6. The food waste fermentation wastewater treatment device according to claim 4, wherein the first combined filler (28) and the second combined filler (29) are made of polypropylene plastic rings and aldehyde fibers composition. 7. The food waste fermentation wastewater treatment device according to claim 1, wherein the anoxic-negative pressure stripping treatment zone and the aerobic biological treatment zone are separated by a fifth partition wall (34). open, the aerobic biological treatment zone and the coagulation sedimentation zone are separated by a sixth partition wall (35). 8. A method for treating food waste fermentation wastewater, which is applied to the food waste fermentation wastewater treatment device according to any one of claims 1 to 7, wherein the method comprises: Step S1, anoxic-stripping treatment: the pretreated kitchen waste fermentation wastewater and the nitrifying solution returned from the aerobic treatment zone (2) simultaneously enter the anoxic treatment zone (1) for anoxic denitrification, The pretreated kitchen waste fermentation wastewater and the refluxed nitrification solution are controlled by the water inlet solenoid valve (15) to enter the two groups of anoxic treatment zones (1) in turn, to convert the nitrate nitrogen in the sewage into nitrogen, and to make the lack of oxygen. The pH value in the oxygen treatment zone (1) is increased; then the negative pressure stripping device (23) is used to carry out the negative pressure stripping of ammonia nitrogen in the two groups of anoxic treatment zones (1). 24) Respectively absorb the ammonia nitrogen produced by stripping in the two groups of anoxic treatment zones (1); Step S2, aerobic biological treatment: the sewage after anoxic-stripping treatment respectively enters the aerobic treatment zone (2) for aerobic nitrification. ) to deliver air to the aerobic treatment zone (2); Step S3, coagulation and sedimentation treatment: the sewage that has undergone aerobic nitrification enters the coagulation and sedimentation treatment zone (3), and the coagulant is put into the coagulation and sedimentation treatment zone (3) for coagulation treatment of the sewage. After the coagulation treatment, the sewage is precipitated; after the sedimentation treatment, the wastewater in the upper part is discharged, and the sludge in the lower part is discharged.

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