CN103508642B - High-grease food processing wastewater treatment device - Google Patents

Abstract

The invention relates to a high-grease food processing wastewater treatment device which comprises a coarse grating, a fine grating, a water collecting tank, an accident tank, an ABR reactor, a coagulation tank, an air flotation tank, an aeration biological filter tank, a coagulation reaction tank, a filter cloth filter tank, a contact tank, a sludge tank, a mechanical concentration tank, a sludge dehydrator, a methane desulfurization and incineration system and a tail gas deodorization system. Aiming at the characteristic of high oil concentration in food processing wastewater, the invention firstly removes animal and plant floating oil through a multi-cell structural form of an ABR reactor, then adds lime and PAC to enable organic pollutants such as animal and plant oil in the wastewater to form flocs, phosphate radicals in the wastewater react with calcium ions and aluminum ions to generate phosphate precipitates to be removed, then a large amount of micro bubbles are generated through an air flotation tank to promote residual oil to adhere to impurity floc particles to form flocs with specific gravity smaller than that of water to float on the water surface, thereby removing most organic pollutants such as vegetable oil and the like, enabling the oil index to reach the standard and reducing the load of subsequent BAF biochemical treatment.

Description

High-fat food processing wastewater treatment device

technical field

The invention relates to a high-fat wastewater treatment device, in particular to a high-fat food processing wastewater treatment device with ABR anaerobic technology, air flotation technology and BAF technology, belonging to the field of water pollution control of environmental engineering.

Background technique

The food industry has a wide range of raw materials, a wide variety of products, and a large amount of water is used in the processing process, so a lot of waste is discharged in the form of sewage. The quantity and quality of discharged wastewater vary widely. The main pollutants in wastewater are: (1) solid substances floating in wastewater, such as vegetable leaves, fruit peels, minced meat, poultry feathers, etc.; (2) substances suspended in wastewater are oil, protein, starch, colloidal substances, etc.; (3) Acids, alkalis, salts, sugars, etc. dissolved in wastewater, especially high content of phosphorus compounds and nitrogen compounds; (4) Silt and other organic matter entrained in raw materials; (5) Pathogenic bacteria and viruses, etc. Due to the wide variety of foods and wide sources of raw materials, food processing sewage has high suspended solids, high oil content, many heavy metal ions, large COD and BOD values, large changes in water volume, high nitrogen and phosphorus compound content, and high water temperature. Water quality characteristics.

At present, the food processing wastewater treatment methods mainly include: (1) Physical treatment methods: mainly include sieving, skimming, adjustment, sedimentation, air flotation, centrifugal separation, filtration, microfiltration, etc. (2) Chemical treatment methods: mainly neutralization, coagulation, electrolysis, redox, ion exchange, membrane separation, etc. (3) Biological treatment methods: mainly aerobic method, anaerobic method, stabilization pond, land treatment and a combination of the above methods.

There are many ways to treat food processing wastewater, but one method alone is often ineffective. It is necessary to adopt multiple technologies for combined treatment according to the water quality characteristics of different industrial wastewater and the different components of pollutants in order to achieve the ideal treatment effect. .

Contents of the invention

The purpose of the present invention is to provide a method based on ABR anaerobic technology, aiming at defects such as long design process flow, overly complicated structure of the treatment system, high operating costs, and substandard discharged wastewater after treatment in the treatment of high-fat food processing wastewater. The combination of air flotation technology and BAF technology has a good effect on removing grease, COD, ammonia nitrogen and phosphorus, and is a low-cost, high-fat food processing wastewater treatment device with a simple treatment system.

The high-fat food processing wastewater treatment device is equipped with coarse screens, fine screens, sump pools, accident pools, ABR reactors, coagulation tanks, air flotation tanks, aerated biological filters (abbreviated as BAF aerated filters), mixed Coagulation reaction tank, filter cloth filter tank, contact tank, sludge tank, mechanical thickening tank, sludge dehydrator, biogas desulfurization and incineration system, tail gas deodorization system; the import of the above coarse grid and the export of high-fat food processing wastewater Connection, the outlet of the coarse grill is connected with the inlet of the fine grill, one of the outlets of the fine grill is connected with the inlet of the sump, the other is connected with the inlet of the accident pool, the outlet of the accident pool is connected with the inlet of the sump, the sump The water outlet is connected to the water inlet of the ABR reactor, the water outlet of the ABR reactor is connected to the water inlet of the coagulation tank, the water outlet of the coagulation tank is connected to the water inlet of the air flotation tank, the water outlet of the air flotation tank is connected to the BAF water inlet, and the BAF water outlet is connected to the mixing tank. The water inlet of the coagulation reaction tank is connected, the water outlet of the coagulation reaction tank is connected with the water inlet of the filter cloth filter, and the water outlet of the filter cloth filter is connected with the water inlet of the contact tank; the sediment of the ABR reactor, the coagulation tank and the coagulation reaction tank (i.e. sludge) and the scum (i.e. sludge) outlet of the air flotation tank are connected to the inlet of the sludge tank, the outlet of the sludge tank is connected to the inlet of the mechanical thickening tank, and the outlet of the mechanical thickening tank is connected to the inlet of the sludge dehydrator; ABR reactor The biogas outlet is connected to the biogas desulfurization and incineration system; the tail gas outlets of the sump, ABR reactor and air flotation tank are all connected to the tail gas deodorization system.

More specifically:

The above-mentioned air flotation tank adopts air flotation method to treat wastewater, and the air flotation method is one of air distribution air flotation method, electrical flotation method, biological and chemical air flotation method or dissolved air flotation method.

The above-mentioned coagulation tank, coagulation reaction tank and contact tank all have a dispensing system and a dosing system.

The above-mentioned sludge dewatering machine is one of a stacked screw dewatering machine, a vacuum filter dewatering machine, a filter press dewatering machine or a centrifugal dewatering machine.

The technical scheme of the present invention is: high-fat food processing waste water → slag removal → ABR anaerobic treatment → air flotation → BAF biochemical → filter cloth filtration → disinfection → water discharge.

The effect of high-fat food processing wastewater treated by the above technical solutions is shown in Table 1:

Table 1 The effect of each treatment unit of high-fat food processing wastewater

Using the present invention to treat food waste water so that it reaches the first-level A standard of the "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002), the energy consumption is: ≤0.44 degrees/ton; the waste water treatment agent of the treatment method of the present invention Consumption: ≤0.24 yuan/ton.

Compared with the prior art, the present invention has the following outstanding advantages:

(1) In view of the water quality characteristics of high oil concentration in food processing wastewater, first remove animal and plant oil slicks through the multi-compartment structure of the ABR reactor, and then add lime and PAC to make organic pollutants such as animal and vegetable oils in the wastewater form flocs Phosphate radicals in wastewater react with calcium ions and aluminum ions to form phosphate precipitation and remove them, and then generate a large number of fine air bubbles through the air flotation tank, which promotes the residual oil to adhere to the impurity floc particles, forming flocs with a specific gravity lower than water Floating to the water surface, thereby removing most of the organic pollutants such as animal and vegetable oils, not only making the oil indicators meet the standards, but also reducing the load of subsequent BAF biochemical treatment.

(2) Through the nitrification and denitrification of microorganisms in BAF, ammonia nitrogen and total nitrogen in food processing wastewater can be effectively removed.

(3) First, by adding lime and PAC to the coagulation tank, the phosphate radical in the wastewater reacts with calcium ions and aluminum ions to form phosphate precipitation, and then adds PAC to the subsequent coagulation reaction tank to further chemically remove phosphorus , to ensure total phosphorus ≤ 0.5mg/L.

(4) The high-fat food processing wastewater can be treated by the present invention, and the effluent water quality can reach the first-class A standard in the national comprehensive sewage discharge standard (GB8978-1996).

(5) The biogas produced by anaerobic microorganisms in the ABR reactor is processed by the biogas desulfurization and incineration system before entering the tail gas deodorization system, and the gas generated by the water collection tank and the air flotation tank is also treated with the tail gas deodorization system, not only for anaerobic The generated biogas is recycled as a resource, and the odor generated during the wastewater treatment process is greatly reduced through the tail gas deodorization system to ensure the surrounding air quality.

Description of drawings

FIG. 1 is a schematic diagram of the structure and composition of an embodiment of the above-mentioned high-fat food processing wastewater treatment device of the present invention.

detailed description

The specific embodiment of the present invention is described below with reference to accompanying drawing 1.

Referring to Fig. 1, the high-fat food processing wastewater treatment device is characterized in that it includes a coarse grid 1, a fine grid 2, a sump 3, an accident pool 4, an ABR reactor 5, a coagulation tank 6, an air flotation tank 7, an aeration tank Biogas filter (BAF) 8, filter cloth filter 9, contact tank 10, sludge tank 11, mechanical concentration tank 12, sludge dehydrator 13, coagulation reaction tank 14, biogas desulfurization and incineration system 15, tail gas removal Odor system 16, dispensing and dosing system A, dispensing and dosing system B, dosing and dosing system C.

The inlet of the coarse grid 1 is connected to the outlet of the high-fat food processing waste water, the outlet of the coarse grid 1 is connected to the water inlet of the fine grid 2, the water outlet of the fine grid 2 is connected to the water inlet of the sump 3, and the other is connected to the water inlet of the sump 3. The water inlet of accident pool 4 is connected, the water outlet of accident pool 4 is connected with the water inlet of sump 3, the water outlet of sump 3 is connected with the water inlet of ABR reactor 5, the water outlet of ABR reactor 5 is connected with the water inlet of coagulation tank 6, and the mixing The water outlet of coagulation tank 6 is connected with the water inlet of air flotation tank 7, the water outlet of air flotation tank 7 is connected with the water inlet of biological aerated filter tank 8, the water outlet of biological aerated filter tank 8 is connected with the water inlet of coagulation reaction tank 14, and the coagulation reaction tank The 14 water outlet is connected with the water inlet of the filter cloth filter 9, and the water outlet of the filter cloth filter 9 is connected with the water inlet of the contact tank 10; ) and the scum (i.e. sludge) outlet of the air flotation tank 7 are connected with the inlet of the sludge tank 11, the outlet of the sludge tank 11 is connected with the inlet of the mechanical thickening tank 12, and the outlet of the mechanical thickening tank 12 is connected with the inlet of the sludge dehydrator 13; ABR The biogas outlet of the reactor 5 is connected with the biogas desulfurization and incineration system 15 ;

The present invention is the design of the high-fat food processing wastewater treatment device completed after an in-depth and systematic comparative study on the components, properties and existing treatment schemes of the existing high-fat food processing wastewater. It uses ABR, air flotation and aeration The comprehensive application of biological filter and other technologies has formed a treatment device that is especially suitable for high-fat food processing wastewater.

The specific embodiment of the present invention is described below with reference to accompanying drawing 1.

Example 1

10 tons/day High fat food processing wastewater treatment method.

The water quality indicators of the above-mentioned high-fat food processing wastewater have been determined and are shown in Table 2.

Table 2 Water quality indicators of high-fat food processing wastewater

serial number project unit measured value serial number project unit measured value 1 COD _Cr mg/L 1800 5 Total Phosphorus mg/L 8 2 BOD ₅ mg/L 800 6 total nitrogen mg/L 60 3 SS mg/L 400 7 oil mg/L 120 4 Ammonia nitrogen mg/L 60 the the the the

(1) Slag removal

The high-fat food processing wastewater is collected by the pipeline and enters the coarse grid 1 and the fine grid 2. The coarse floating matter in the wastewater is removed through the coarse grid 1, and then most of the insoluble substances in the water are further removed through the fine grid 2. Suspended solids, the generated slag is packaged and transported abroad to prevent the suspended solids from clogging subsequent pipes, pumps and structures; under normal operation, the wastewater enters the sump 3; when an emergency occurs, the wastewater enters the accident pool 4 and passes through the accident pool 4 To store the discharged water during accidental production, so that it can enter the sump 3 after subsequent dilution treatment, so as to prevent the impact of high concentration load on the subsequent treatment process;

(2) ABR anaerobic treatment

The effluent of the sump 3 is lifted into the ABR reactor 5 by the lifting pump. On the one hand, the multi-compartment structure of the ABR reactor 5 is used to remove oil slicks; Under the combined action of methanogenesis, organic acids are decomposed into methane and carbon dioxide, reducing COD;

(3) air flotation

The effluent from the ABR reactor 5 flows into the coagulation tank 6, through the dispensing and dosing system A, first add 5ppm of lime under stirring conditions, then add 5ppm of PAC for coagulation treatment, and finally add 60ppm of lime to adjust the pH to 8.0 Enter the air flotation tank 7 for air flotation separation, remove oil and phosphorus through air flotation, and further reduce SS;

(4) Biological aerated filter biochemistry

The effluent from the air flotation tank enters the biological aerated filter 8, and the wastewater is purified through biological oxidation and degradation to further remove COD, ammonia nitrogen and total nitrogen, and at the same time play a role in filtering to further remove SS to obtain purified wastewater;

(5) Coagulation

The effluent from the biological aerated filter 8 first flows into the coagulation reaction tank 14 by gravity;

(6) filter

The effluent from the coagulation reaction tank 14 flows into the filter cloth filter tank 9 for filtration and separation by gravity, so as to complete the removal of total phosphorus;

(7) Disinfection

The effluent from the filter cloth filter 9 enters the contact pool 10 to carry out chlorine dioxide disinfection through the dispensing and dosing system C to sterilize the waste water; at the same time, the contact pool 10 doubles as a backwash pool;

(8) Sludge treatment

Step (2) ABR reactor 5 for ABR anaerobic treatment, step (3) coagulation tank 6 in air flotation, step (5) sediment (ie sludge) produced in coagulation reaction tank 14 in coagulation and step ( 3) The scum (sludge) produced by the air flotation tank 7 in the air flotation enters the sludge tank 11 through the pipeline, and then goes through the dehydration of the mechanical thickening tank 12 and the sludge dewatering machine 13 in order to reduce the volume of the sludge and dehydrate it. Finally, the dried mud is transported or composted, and the filtrate is returned to the sump 3 in the step (1) of slag removal; the above-mentioned sludge dewatering machine 13 is a centrifugal dehydrating machine;

(9) Gas treatment

In step (2) in the anaerobic treatment, the biogas produced by the anaerobic microorganisms in the ABR reactor 5 is treated by the biogas desulfurization and incineration system 15, and the tail gas enters the tail gas deodorization system 16 for treatment; And the gas generated by the air flotation tank 7 in the air flotation in step (3) also enters the tail gas deodorization system 16 for treatment.

Table 3 shows the effect after processing by each processing unit.

Table 3 Effect of treatment of high-fat food processing wastewater

Example 2

40 tons/day high fat food processing wastewater treatment method.

The water quality indicators of the above-mentioned high-fat food processing wastewater have been determined and are shown in Table 4.

Table 4 Water quality indicators of high-fat food processing wastewater

serial number project unit measured value serial number project unit measured value 1 COD _Cr mg/L 2000 5 Total Phosphorus mg/L 10 2 BOD ₅ mg/L 1200 6 total nitrogen mg/L 80 3 SS mg/L 500 7 oil mg/L 150 4 Ammonia nitrogen mg/L 80 the the the the

(1) Slag removal

The high-fat food processing wastewater is collected by the pipeline and enters the coarse grid 1 and the fine grid 2. The coarse floating matter in the wastewater is removed through the coarse grid 1, and then most of the insoluble substances in the water are further removed through the fine grid 2. Suspended solids, the generated slag is packaged and transported abroad to prevent the suspended solids from clogging subsequent pipes, pumps and structures; under normal operation, the wastewater enters the sump 3; when an emergency occurs, the wastewater enters the accident pool 4 and passes through the accident pool 4 To store the discharged water during accidental production, so that it can enter the sump 3 after subsequent dilution treatment, so as to prevent the impact of high concentration load on the subsequent treatment process;

(2) ABR anaerobic treatment

The effluent of the sump 3 is lifted into the ABR reactor 5 by the lifting pump. On the one hand, the multi-compartment structure of the ABR reactor 5 is used to remove oil slicks; Under the combined action of methanogenesis, organic acids are decomposed into methane and carbon dioxide, reducing COD;

(3) air flotation

The effluent of ABR reactor 5 flows into the coagulation tank 6, through the dispensing and dosing system A, under stirring conditions, 75ppm of lime is first added, and then 60ppm of PAC is added for coagulation treatment, and finally 180ppm of lime is added to adjust the pH to 8.5. Enter the air flotation tank 7 for air flotation separation, remove oil and phosphorus through air flotation, and further reduce SS;

(4) Biological aerated filter biochemistry

The effluent from the air flotation tank 7 enters the biological aerated filter 8, and the wastewater is purified through biological oxidation and degradation to further remove COD, ammonia nitrogen and total nitrogen, and at the same time play a role in filtering to further remove SS to obtain purified wastewater;

(5) Coagulation

The effluent from the biological aerated filter 8 first flows into the coagulation reaction tank 14 by gravity, and 20ppm of PAC is added through the dispensing and dosing system B to carry out chemical phosphorus removal to ensure that the total phosphorus reaches the standard;

(6) filter

The effluent from the coagulation reaction tank 14 flows into the filter cloth filter tank 9 for filtration and separation by gravity, so as to complete the removal of total phosphorus;

(7) Disinfection

The effluent from the filter cloth filter 9 enters the contact pool 10 to carry out chlorine dioxide disinfection through the dispensing and dosing system C to sterilize the waste water; at the same time, the contact pool 10 doubles as a backwash pool;

(8) Sludge treatment

Step (2) ABR reactor 5 for ABR anaerobic treatment, step (3) coagulation tank 6 in air flotation, step (5) sediment (ie sludge) produced in coagulation reaction tank 14 in coagulation and step ( 3) The scum (sludge) produced by the air flotation tank 7 in the air flotation enters the sludge tank 11 through the pipeline, and then goes through the dehydration of the mechanical thickening tank 12 and the sludge dewatering machine 13 in order to reduce the volume of the sludge and dehydrate it. Finally, the dried mud is transported or composted, and the filtrate is returned to the sump 3 in the step (1) of slag removal; the above-mentioned sludge dewatering machine 13 is a filter press dehydrating machine;

(9) Gas treatment

In step (2) in the anaerobic treatment, the biogas produced by the anaerobic microorganisms in the ABR reactor 5 is treated by the biogas desulfurization and incineration system 15, and the tail gas enters the tail gas deodorization system 16 for treatment; And the gas generated by the air flotation tank 7 in the air flotation in step (3) also enters the tail gas deodorization system 16 for treatment.

Table 5 shows the effect after processing by each processing unit.

Table 5 Effect of high-fat food processing wastewater after treatment

Example 3

12,000 tons/day of a milk and peanut series food processing wastewater treatment project.

The water quality indicators of the above-mentioned certain milk and peanut series food processing wastewater have been determined and are shown in Table 6.

Table 6 Water quality indicators of a certain milk and peanut series food processing wastewater

serial number project unit measured value serial number project unit measured value 1 COD _Cr mg/L 1200 5 Total Phosphorus mg/L 5 2 BOD ₅ mg/L 600 6 total nitrogen mg/L 50 3 SS mg/L 300 7 oil mg/L 100 4 Ammonia nitrogen mg/L 40 the the the the

(1) Slag removal

The high-fat food processing wastewater is collected by the pipeline and enters the coarse grid 1 and the fine grid 2. The coarse floating matter in the wastewater is removed through the coarse grid 1, and then most of the insoluble substances in the water are further removed through the fine grid 2. Suspended solids, the generated slag is packaged and transported abroad to prevent the suspended solids from clogging subsequent pipes, pumps and structures; under normal operation, the wastewater enters the sump 3; when an emergency occurs, the wastewater enters the accident pool 4 and passes through the accident pool 4 To store the discharged water during accidental production, so that it can enter the sump 3 after subsequent dilution treatment, so as to prevent the impact of high concentration load on the subsequent treatment process;

(2) ABR anaerobic treatment

The effluent of the sump 3 is lifted into the ABR reactor 5 by the lifting pump. On the one hand, the multi-compartment structure of the ABR reactor 5 is used to remove oil slicks; Under the combined action of methanogenesis, organic acids are decomposed into methane and carbon dioxide, reducing COD;

(3) air flotation

The effluent from ABR reactor 5 flows into the coagulation tank 6, through the dispensing and dosing system A, first add 50ppm of lime under stirring conditions, then add 40ppm of PAC for coagulation treatment, and finally add 125ppm of lime to adjust the pH to 8.2 Enter the air flotation tank 7 for air flotation separation, remove oil and phosphorus through air flotation, and further reduce SS;

(4) Biological aerated filter biochemistry

The effluent from the air flotation tank enters the biological aerated filter 8, and the wastewater is purified through biological oxidation and degradation to further remove COD, ammonia nitrogen and total nitrogen, and at the same time play a role in filtering to further remove SS to obtain purified wastewater;

(5) Coagulation

The effluent from the biological aerated filter 8 first flows into the coagulation reaction tank 14 by itself, and 10ppm of PAC is added through the dispensing and dosing system B to carry out chemical phosphorus removal to ensure that the total phosphorus reaches the standard;

(6) filter

The effluent from the coagulation reaction tank 14 flows into the filter cloth filter tank 9 for filtration and separation by gravity, so as to complete the removal of total phosphorus;

(7) Disinfection

The effluent from the filter cloth filter 9 enters the contact pool 10 to carry out chlorine dioxide disinfection through the dispensing and dosing system C to sterilize the waste water; at the same time, the contact pool 10 doubles as a backwash pool;

(8) Sludge treatment

Step (2) ABR reactor 5 for ABR anaerobic treatment, step (3) coagulation tank 6 in air flotation, step (5) sediment (ie sludge) produced in coagulation reaction tank 14 in coagulation and step ( 3) The scum (sludge) produced by the air flotation tank 7 in the air flotation enters the sludge tank 11 through the pipeline, and then goes through the dehydration of the mechanical thickening tank 12 and the sludge dewatering machine 13 in order to reduce the volume of the sludge and dehydrate it. Finally, the dried mud is transported or composted, and the filtrate is returned to the sump 3 in the step (1) of slag removal; the above-mentioned sludge dewatering machine 13 is a stacking screw dehydrating machine;

(9) Gas treatment

In step (2) in the anaerobic treatment, the biogas produced by the anaerobic microorganisms in the ABR reactor 5 is treated by the biogas desulfurization and incineration system 15, and the tail gas enters the tail gas deodorization system 16 for treatment; And the gas generated by the air flotation tank 7 in the air flotation in step (3) also enters the tail gas deodorization system 16 for treatment.

Table 7 shows the effect after processing by each processing unit.

Table 7 Effect of high-fat food processing wastewater after treatment

The total installed capacity of this project is 379.48kW, and the actual operating power is 220.55kW, so the water and electricity consumption per ton of this project is 0.44 degrees, and the water and electricity fee per ton is 0.35 yuan/ton of water;

The pharmacy fee for this project is:

Influent pH value adjustment dosing cost is 0.05 yuan/ton of water (lime dosage 125 mg/L);

Sludge conditioner cationic PAM is calculated on the basis of 8.3kg/t dry sludge, the absolute dry sludge volume of this system is 2.06 tons/day, and the cost of converted ton of water is 0.05 yuan/ton of water;

Dosing for air flotation is PAC40ppm, lime 50ppm, dosing for coagulation reaction tank is PAC10ppm, and the cost is 0.10 yuan/ton of water;

The cost of chlorine dioxide disinfectant is 0.04 yuan/ton of water;

Total medicament fee=0.05+0.05+0.10+0.04=0.24 yuan/ton of waste water;

The full-load direct operating cost of the project is:

Direct cost at full load = 0.35+0.24=0.59 yuan/ton of water.

Claims (3)

1. high fatty foods processing waste water treatment unit, is characterized in that it comprises coarse rack, fine fack, water collecting basin, accident pool, ABR reactor, coagulation basin, air flotation pool, BAF, coagulation reaction tank, filtering cloth filtering pool, contact tank, sludge sump, mechanical thickening groove, sludge dewatering equipment, biogas desulfurization and incineration system, tail gas deodoration system;

The import of described coarse rack connects with the outlet of high fatty foods processing waste water, coarse rack water outlet connects with fine fack water-in, fine fack water outlet one tunnel connects with water collecting basin water-in, another road connects with accident pool water-in, accident pool water outlet connects with water collecting basin water-in, water collecting basin water outlet connects with ABR reactor water-in, ABR reactor water outlet connects with coagulation basin water-in, coagulation basin water outlet connects with air flotation pool water-in, air flotation pool water outlet connects with BAF water-in, effluent of aeration biological filter mouth connects with coagulation reaction tank water-in, coagulation reaction tank water outlet connects with filtering cloth filtering pool water-in, filtering cloth filtering pool water outlet connects with contact tank water-in, the throw out of ABR reactor, coagulation basin, coagulation reaction tank and the scum silica frost outlet of air flotation pool all connect with sludge sump import, and sludge sump outlet connects with the import of mechanical thickening groove, and the outlet of mechanical thickening groove connects with sludge dewatering equipment import, the methane outlet of ABR reactor connects with biogas desulfurization and incineration system, the offgas outlet of water collecting basin, ABR reactor and air flotation pool all connects with tail gas deodoration system.

2. high fatty foods processing waste water treatment unit as claimed in claim 1, is characterized in that: described coagulation basin, coagulation reaction tank and contact tank are all with dispensing system and medicine system.

3. high fatty foods processing waste water treatment unit as claimed in claim 1, is characterized in that: described sludge dewatering equipment is the one in folded spiral shell formula water extracter, vacuum filtering and dewatering machine, filter pressing dehydrator or centrifuge.