White spirit brewing wastewater treatment system

Abstract

The utility model provides a white spirit brewing wastewater treatment system. The white spirit brewing wastewater treatment system comprises a pretreatment device, an anaerobic treatment device, a middle sedimentation tank, an anoxic / aerobic treatment device, a secondary sedimentation tank, an air floatation treatment device and a final sedimentation tank which are arranged in sequence, the pretreatment device comprises a grating tank, a regulating tank, a coagulative precipitation tank and an acidification tank which are arranged in sequence, and a water outlet of the grating tank is connected to the regulating tank; a water outlet of the coagulative precipitation tank is connected to the acidification tank; the anaerobic treatment device is used for performing anaerobic treatment on the wastewater treated by the pretreatment device; the mid-settling tank is used for settling the wastewater of the anaerobic treatment device; the secondary sedimentation tank is used for carrying out solid-liquid separation on effluent of the anoxic / aerobic treatment device; the air floatation treatment device comprises a buffer tank and an air floatation machine which are arranged in sequence. When the liquor brewing wastewater treatment system is used for treating liquor brewing wastewater, the liquor brewing wastewater can reach the indirect discharge standard in Discharge Standard of Fermented Alcohol and White Liquor Industrial Water Dye (GB27631-2011).

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to a liquor brewing wastewater treatment system. Background Art

[0002] Liquor production involves raw material processing, cooking, fermentation, distillation and bottling, from raw material crushing to final distillation to produce finished liquor. Wastewater is generated in each process, including bottom pot water from the distillation process, condensed water from cooling liquefied liquor vapor, fermentation wastewater from cellar fermentation, bottle washing water from the finished product filling and cleaning process, and site flushing water from equipment workshop cleaning, but their pollutant components vary. Among them, the main polluted wastewater is the bottom pot water in the distillation stage and the bottom pot water in the fermentation stage. Bottom pot water is the main source of high-concentration pollutants in liquor brewing wastewater, among which COD Cr , nitrogen, phosphorus and suspended solids content is high, COD concentration can be as high as 12500mg / L-14500mg / L, the discharge can reach more than 80% of the total pollutant discharge, which is a typical high-concentration organic wastewater. Cellar bottom water, commonly known as yellow water, is produced in the fermentation stage. In this stage, the reducing sugar, soluble starch and pigment in the brewing raw materials are integrated into the water during the fermentation process to produce fermentation wastewater. The wastewater generated by other processes, such as liquor steam condensate, bottle washing wastewater, workshop flushing wastewater, etc., are mainly low-concentration organic wastewater, with a light degree of pollution, and have little effect on the generation of the entire brewing wastewater. In summary, liquor brewing wastewater presents the following characteristics: high COD content, high SS content, low pH, good biodegradability and precipitation performance.

[0003] Wastewater generated during the production of liquor will cause serious consequences if it is discharged directly into the environment without treatment. From the perspective of environmental protection, such wastewater contains a large amount of organic matter and nutrients. Direct discharge into the water body will lead to a large consumption of dissolved oxygen (DO) in the water body, causing water hypoxia. At the same time, a large amount of nitrogen and phosphorus input will cause eutrophication of the water body, accelerate the growth of algae and other aquatic organisms, and thus cause problems such as blue algae blooms in the water body, seriously affecting the balance and stability of the aquatic ecosystem, and causing serious impacts on the survival and reproduction of aquatic organisms; if such sewage is discharged directly into the soil, the organic matter in the wastewater will gradually accumulate in the soil, causing the soil structure to become loose and even compacted. In terms of social and economic benefits, if this wastewater is discharged directly into the natural environment, it will lead to an increase in the concentration of nitrate and nitrite in the water body, and further produce carcinogens such as nitrosamines, posing a potential threat to water quality safety and human health. Long-term drinking of contaminated water may lead to health problems such as abnormal liver and kidney function, nervous system damage, and immune system disorders; such wastewater discharged into the soil will seriously affect soil fertility and crop growth, and thus affect agricultural production efficiency.

[0004] Wan Jinbao et al. disclosed "A liquor brewing wastewater treatment system" in China Invention Publication Patent CN106977053A. This system sets a coagulation tank at the front end of the treatment, and adds PAC (polyaluminum chloride) and PAM (polyacrylamide) to achieve the treatment of fine suspended matter and colloidal particles in the liquor wastewater. However, part of the actual liquor brewing wastewater comes from the bottom water of the cellar, so it will appear darker yellow-brown or brown, which involves an indicator that needs special attention when treating liquor brewing wastewater-chroma. This scheme only adds flocculants to the coagulation tank in the pretreatment stage to remove suspended matter and colloids in the wastewater. This treatment may not achieve good results when dealing with liquor brewing wastewater with higher chroma.

[0005] The treatment of liquor brewing wastewater is imminent, and scientific and reasonable wastewater treatment technologies need to be adopted to treat it into water quality that meets discharge standards. Summary of the invention

[0006] The purpose of the utility model is to provide a liquor brewing wastewater treatment system, which is designed to treat actual liquor brewing wastewater to meet sewage discharge standards, achieve ecological protection, energy conservation and emission reduction, reduce pollution, and promote the further development of liquor brewing industry production technology, sewage discharge and pollution control technology.

[0007] In order to achieve the purpose of the present invention, the utility model provides a liquor brewing wastewater treatment system, comprising a pretreatment device, an anaerobic treatment device, a middle sedimentation tank, an anoxic / aerobic treatment device, a secondary sedimentation tank, an air flotation treatment device and a final sedimentation tank which are arranged in sequence;

[0008] The pretreatment device comprises a grid tank, a regulating tank, a coagulation sedimentation tank and an acidification tank which are arranged in sequence, wherein the water outlet of the grid tank is connected to the regulating tank; the water outlet of the coagulation sedimentation tank is connected to the acidification tank;

[0009] The anaerobic treatment device is used to perform anaerobically treatment on the wastewater treated by the pretreatment device;

[0010] The intermediate settling tank is used to settle the wastewater from the anaerobic treatment unit;

[0011] The secondary sedimentation tank is used to separate solids from liquids in the effluent from the anoxic / aerobic treatment unit;

[0012] The air flotation treatment device comprises a buffer tank and an air flotation machine which are arranged in sequence.

[0013] Furthermore, a first lifting pump is connected to the water outlet of the regulating tank to lift the outlet water to the coagulation sedimentation tank.

[0014] Furthermore, it also includes a sludge thickening tank, and the sludge outlet of the coagulation sedimentation tank is connected to the sludge thickening tank through a sludge pipeline.

[0015] Furthermore, the sludge outlet of the intermediate sedimentation tank and the sludge outlet of the secondary sedimentation tank are connected to the sludge thickening tank through sludge pipelines.

[0016] Furthermore, the water outlet of the acidification tank is connected to a second lifting pump for lifting the effluent to the anaerobic treatment device.

[0017] Furthermore, the anaerobic treatment device comprises a UASB anaerobic tower; the water outlet of the UASB anaerobic tower is connected to a medium sedimentation tank, the water outlet of the medium sedimentation tank is connected to an anoxic / aerobic treatment device, and the sludge outlet is connected to a sludge thickening tank through a sludge pipeline.

[0018] Furthermore, the anoxic / aerobic treatment device includes a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank and a secondary aerobic tank which are arranged in sequence, the water outlet of the primary anoxic tank is connected to the primary aerobic tank, the water outlet of the primary aerobic tank is connected to the secondary anoxic tank, the sludge outlet of the primary aerobic tank is returned to the primary anoxic tank through a sludge pipe, the water outlet of the secondary anoxic tank is connected to the secondary aerobic tank, the water outlet of the secondary aerobic tank is connected to the secondary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected to the buffer tank.

[0019] Furthermore, the primary aerobic tank is filled with elastic fillers, which can increase the contact area between activated sludge and water, cultivate dominant bacteria on the surface and inner layer of the elastic fillers, and remove BOD, nitrogen and phosphorus.

[0020] Furthermore, both the primary aerobic tank and the secondary aerobic tank are connected to an aeration fan through an aeration pipeline.

[0021] Furthermore, it also includes a comprehensive equipment room, and the aeration fan is located in the comprehensive equipment room.

[0022] Furthermore, the outlet of the buffer tank is connected to a lifting pump to lift the effluent to the flotation machine; the outlet of the horizontal flow pressurized high-efficiency dissolved air flotation machine is connected to the final sedimentation tank; the final sedimentation tank is connected to the sludge pipeline to discharge the precipitated sludge to the sludge thickening tank, and the effluent meets the discharge standards. Preferably, the flotation machine is a horizontal flow pressurized high-efficiency dissolved air flotation machine.

[0023] Compared with the prior art, the beneficial effects of the present invention are at least as follows:

[0024] (1) The utility model sets up an air flotation machine, utilizes a large number of tiny bubbles to combine with suspended matter, makes the suspended matter adhere to the surface of the bubbles, floats to the surface of the sewage, and then collects and treats the suspended matter. This method is faster than sedimentation and has a high removal rate. In particular, for the deep treatment of liquor brewing wastewater, it can more effectively remove scum and insoluble colloids and suspended matter in water, and more effectively reduce chroma.

[0025] (2) The liquor brewing wastewater treatment system provided by the utility model can effectively remove pollutants in liquor brewing wastewater according to the characteristics of liquor brewing wastewater and significantly reduce the chromaticity. Wastewater with CODcr≤10000mg / L, BOD5≤5000mg / L, SS≤1000mg / L, and ammonia nitrogen≤80mg / L can be treated to meet the indirect emission standards in the "Emission Standards of Water Pollutants for Fermentation Alcohol and Liquor Industry" (GB27631-2011): CODcr≤400mg / L, BOD5≤80mg / L, SS≤140mg / L, ammonia nitrogen≤30mg / L, TN≤50mg / L, and TP≤3mg / L, achieving good treatment effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a process flow chart of a liquor brewing wastewater treatment system provided in an embodiment of the utility model.

[0027] Figure 2 This is a structural diagram of a UASB anaerobic tower of a liquor brewing wastewater treatment system in an embodiment of the utility model.

[0028] Figure 3 This is a two-stage anoxic / aerobic treatment process flow chart of a liquor brewing wastewater treatment system in an embodiment of the utility model.

[0029] In the figure, there is a sludge reaction zone 1, a gas-liquid-solid three-phase separator 2, a gas chamber 3, a water distribution system 4, and a water seal tank 5. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Combination Figure 1 As shown, the utility model provides a liquor brewing wastewater treatment system, which includes a pretreatment device, an anaerobic treatment device, a medium sedimentation tank, an anoxic / aerobic treatment device, a secondary sedimentation tank, a flotation treatment device, a final sedimentation tank, a sludge concentration tank and a comprehensive equipment room.

[0032] Combination Figure 1As shown, in some embodiments of the utility model, the pretreatment device includes a grille tank, a regulating tank, a coagulation sedimentation tank and an acidification tank; an artificial grille is provided at the water inlet of the grille tank, and a first lifting pump is provided at the water outlet of the regulating tank to lift the effluent to the coagulation sedimentation tank; the effluent of the coagulation sedimentation tank flows into the acidification tank by gravity, and the water outlet of the acidification tank is connected to a second lifting pump for lifting the effluent to the anaerobic treatment device; the coagulation sedimentation tank is connected to the sludge thickening tank through a sludge pipe.

[0033] In the pretreatment device, the wastewater flows by gravity into the regulating tank after large suspended solids are removed through the artificial screen of the screen pool. After the water quality and quantity are adjusted, it is pumped to the coagulation sedimentation tank, where PAC (polyaluminium chloride) and PAM (polyacrylamide) are added to remove suspended solids in the wastewater by flocculation. The effluent flows by gravity to the acidification tank, where it is hydrolyzed and acidified, and Na2CO3 is added to ensure the pH required for the subsequent UASB anaerobic tower reaction.

[0034] The pretreated sewage is pumped from the acidification tank to the UASB anaerobic tower for anaerobic treatment. The effluent flows by gravity to the intermediate sedimentation tank for sedimentation. The sludge is transported to the sludge thickening tank through the sludge pipeline, and the effluent flows by gravity into the anoxic / aerobic device.

[0035] Combination Figure 2 As shown, the anaerobic treatment device comprises a primary UASB anaerobic tower; the UASB anaerobic tower comprises a sludge reaction zone 1, a gas-liquid-solid three-phase separator 2 (including a sedimentation zone) and a gas chamber 3. A large amount of anaerobic sludge is retained in the sludge reaction zone to form a sludge layer. Sewage flows into the bottom of the anaerobic sludge bed and mixes with the sludge in the sludge layer. The microorganisms in the sludge decompose the organic matter in the sewage and convert it into biogas. The biogas is continuously released in the form of tiny bubbles. The tiny bubbles gradually merge to form larger bubbles during the rising process. Sludge with a lower sludge concentration is formed at the upper part of the sludge bed due to the stirring of the biogas. It rises and enters the gas-liquid-solid three-phase separator. When the biogas hits the reflective plate at the bottom of the gas-liquid-solid three-phase separator (directly using existing products), it is bent to the four sides of the reflective plate, passes through the water layer and enters the air chamber. The air chamber is connected to the water seal tank through a conduit. The water seal tank is provided with an outlet pipe to lead out the biogas; the solid-liquid mixture enters the sedimentation area of ​​the gas-liquid-solid three-phase separator after reflection, the sludge flocculates, the particles gradually increase, and settle under the action of gravity. The sludge settled on the inclined wall slides back to the sludge reaction area along the inclined wall, so that a large amount of sludge accumulates in the reaction area, and the effluent separated from the sludge overflows from the upper part of the overflow weir in the sedimentation area and is discharged from the sludge bed.

[0036] The anoxic / aerobic device includes a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank and two sets of aeration fans; the comprehensive equipment room is used to place the flotation machine, the aeration fan and the dosing device. The dosing device is used to add reagents such as PAC and PAM to the sewage treatment process. In some embodiments of the utility model, the dosing device adopts the existing sewage treatment dosing system on the market. Its structure and working principle are not described in detail here.

[0037] Combination Figure 1 As shown, in some embodiments of the present invention, the anoxic / aerobic device is a two-stage structure, including a primary anoxic / aerobic treatment system and a secondary anoxic / aerobic treatment system connected in series.

[0038] Specifically, the primary anoxic / aerobic treatment system includes a primary anoxic tank and a primary aerobic tank connected in sequence; the secondary anoxic / aerobic treatment system includes a secondary anoxic tank and a secondary aerobic tank connected in sequence; the water outlet of the secondary aerobic tank is connected to the secondary sedimentation tank, and the supernatant of the secondary aerobic tank overflows into the buffer tank through the overflow weir; the primary anoxic tank is connected to the primary aerobic tank through a sludge return pipe; an aeration fan is provided in the comprehensive equipment room, and the primary aerobic tank and the secondary aerobic tank are both connected to the aeration fan through an aeration pipe; the secondary sedimentation tank is connected to the sludge thickening tank through a sludge pipe, and mud and water separation is performed in the secondary sedimentation tank.

[0039] In some embodiments of the utility model, the aeration head used in the anoxic / aerobic treatment device adopts the most advanced rubber film microporous aeration head in the current international water treatment. The device will not be blocked during operation, and has the advantages of small aeration pores and high oxygen utilization rate. The oxygenation capacity and oxygen transfer rate of the aerator (tube) are directly related to the growth and reproduction of microorganisms, that is, they directly affect the treatment effect of the system. At the same time, the service life and maintenance frequency of the aerator (tube) directly affect the convenience of operation and management of the equipment. The aeration system is usually set at the bottom of the equipment, and the conventional aerator (tube) has a low oxygen transfer rate and a high maintenance frequency. Therefore, the use of this microporous aeration head can ensure the use effect and service life.

[0040] The sewage treated by the anaerobic treatment device flows into the two-stage anoxic / aerobic treatment device. The wastewater after anoxic treatment flows by gravity into the aerobic tank. The aerobic tank uses aerobic bacteria to remove organic matter in the sewage, and the COD and ammonia nitrogen in the sewage are greatly reduced; the first-level aerobic tank is filled with elastic fillers, and the aeration fan supplies oxygen through the aeration pipe to remove COD, ammonia nitrogen and phosphorus in the wastewater; the first-level anoxic / aerobic system is equipped with sludge return, which returns the sludge in the first-level aerobic tank to the first-level anoxic tank, and the effluent flows by gravity into the second sedimentation tank for solid-liquid separation, and the sludge is discharged to the sludge concentration tank through the sludge pipe.

[0041] Combination Figure 1As shown, in some embodiments of the utility model, the flotation treatment device includes a buffer tank and a high-efficiency dissolved air flotation machine connected in sequence; the water outlet of the buffer tank is connected to a lifting pump to lift the outlet water to the flotation machine; the water outlet of the horizontal pressurized high-efficiency dissolved air flotation machine is connected to the final sedimentation tank; the sludge in the final sedimentation tank is connected to the sludge pipeline and discharged to the sludge thickening tank, and the effluent meets the discharge standards.

[0042] In order to ensure the stability of the effluent quality and further remove pollutants in the wastewater, the supernatant of the wastewater flowing into the buffer tank flows into the flotation machine, where PAC, PAM and decolorizer are added to carry out flocculation reaction. A large number of tiny bubbles are combined with suspended matter to bring the solid suspended matter to the water surface, and the scraper is used to scrape the scum formed on the surface into the scum tank, further reducing the suspended matter carried by the effluent.

[0043] The wastewater is sequentially treated by the pretreatment device, anaerobic treatment device, intermediate sedimentation tank, anoxic / aerobic treatment device, secondary sedimentation tank, deep flotation treatment device, and final sedimentation tank. The UASB anaerobic tower is used to treat the wastewater anaerobically, which greatly reduces the organic load in the wastewater and further improves the biodegradability of the wastewater, making it convenient for the subsequent anoxic / aerobic device to perform two-stage anoxic / aerobic treatment, thereby improving the treatment efficiency. The wastewater that has been treated by anoxic / aerobic treatment is further treated by removing suspended matter and chroma in the deep flotation treatment device, so that it meets the discharge standards.

[0044] Application examples:

[0045] The amount of wastewater generated by the production of liquor by a brewing company in Province G is about 80m 3 / d, according to the water quality data provided, wastewater COD Cr The concentration is 10000mg / L, the BOD5 concentration is 5000mg / L, the suspended particulate matter concentration is 1000mg / L, the ammonia nitrogen concentration is 80mg / L, the total nitrogen concentration is 150mg / L, the total phosphorus concentration is 20mg / L, and the pH is 5-6. In order to be able to stably and meet the standards for treating the wastewater, a liquor brewing wastewater treatment system provided by the above embodiment of the utility model is implemented. The specific treatment steps are as follows:

[0046] Pretreatment: wastewater is treated with a volume of 3m 3 The effective volume of the screen pool after removing large suspended matter is 60m 3 The regulating pool adjusts the water volume and adds NaOH to adjust the water quality. The effluent is pumped into a 7.5m 3 The coagulation sedimentation tank is filled with PAC and PAM to carry out flocculation reaction to further remove suspended solids. The effluent flows into the 50m 3 The acidification tank is used for hydrolysis and acidification, and Na2CO3 is added to adjust the pH of the wastewater.

[0047] Anaerobic treatment: The pre-treated wastewater is pumped to the UASB anaerobic tower for anaerobic oxidation, and the effluent flows into the 45m 3 The UASB anaerobic tower has a diameter of 7m and a height of 8m.

[0048] Anoxic / aerobic treatment: The sewage treated by UASB anaerobic tower flows into the two-stage anoxic / aerobic treatment device. The wastewater flows into the volume of 90m 3 In the primary anoxic pool, organic matter is used by heterotrophic bacteria such as denitrifying bacteria to reduce the organic matter concentration and ammonia nitrogen concentration of the wastewater, and the return of organic sludge releases phosphorus. The effluent of the primary anoxic pool flows into the volume of 135m 3 The primary aerobic pool is filled with elastic fillers. The dominant bacteria cultured in the fillers are used to remove BOD. Nitrifying bacteria convert ammonia nitrogen into nitrates. Polyphosphate bacteria absorb excessive phosphorus in the wastewater. The primary aerobic pool returns the sludge to the primary anoxic pool through the sludge return pipe to replenish the sludge. The effluent flows into the 90m 3 The secondary anoxic pool continues to use the nitrate produced by the primary aerobic pool for denitrification, and the effluent flows into the 135m 3 The secondary aerobic tank continues the nitrification reaction, removes BOD, and absorbs phosphorus. The primary aerobic tank is filled with elastic fillers with a diameter of 200 mm. The aeration fan supplies oxygen to the primary aerobic tank and the secondary aerobic tank through the aeration pipe. The primary anoxic / aerobic treatment system is set up with internal reflow to return the sludge to the primary anoxic tank. The effluent from the secondary aerobic tank flows into the secondary sedimentation tank for mud and water separation.

[0049] Deep flotation treatment: The supernatant after sedimentation in the secondary sedimentation tank overflows into the overflow weir with a volume of 60m 3 The wastewater in the buffer tank is pumped into the high-efficiency dissolved air flotation machine. PAC, PAM and decolorizer are added to perform flocculation reaction to remove suspended matter and color. The scum formed on the surface is scraped into the scum tank by the scraper. The effluent from the flotation machine flows into the 45m 3 The final sedimentation tank is used for mud-water separation, and the sludge is discharged into the 80m 3 The sludge thickening tank is used to detect the effluent quality and ensure that it meets the discharge standards.

[0050] The water quality has been tested and found to meet the indirect emission standards in the "Emission Standards for Water Pollutants in Fermentation Alcohol and Liquor Industry" (GB27631-2011).

[0051] The above embodiments of the present invention are only for the purpose of clearly and in detail explaining the implementation methods of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquor brewing wastewater treatment system, characterized in that: It includes a pre-treatment device, an anaerobic treatment device, a medium sedimentation tank, an anoxic / aerobic treatment device, a secondary sedimentation tank, an air flotation treatment device and a final sedimentation tank which are arranged in sequence; The pretreatment device comprises a grid tank, a regulating tank, a coagulation sedimentation tank and an acidification tank which are arranged in sequence, wherein the water outlet of the grid tank is connected to the regulating tank; the water outlet of the coagulation sedimentation tank is connected to the acidification tank; The anaerobic treatment device is used to perform anaerobically treatment on the wastewater treated by the pretreatment device; The intermediate settling tank is used to settle the wastewater from the anaerobic treatment unit; The secondary sedimentation tank is used to separate solids from liquids in the effluent from the anoxic / aerobic treatment unit; The air flotation treatment device comprises a buffer tank and an air flotation machine which are arranged in sequence.

2. A liquor brewing wastewater treatment system according to claim 1, characterized in that: The water outlet of the regulating tank is connected to a first lifting pump for lifting the outlet water to the coagulation sedimentation tank.

3. A liquor brewing wastewater treatment system according to claim 1, characterized in that: It also includes a sludge thickening tank, and the sludge outlet of the coagulation sedimentation tank is connected to the sludge thickening tank through a sludge pipeline.

4. A liquor brewing wastewater treatment system according to claim 3, characterized in that: The sludge outlet of the intermediate sedimentation tank and the sludge outlet of the secondary sedimentation tank are connected to the sludge thickening tank through sludge pipes.

5. A liquor brewing wastewater treatment system according to claim 1, characterized in that: The water outlet of the acidification tank is connected to a second lifting pump for lifting the effluent to the anaerobic treatment device.

6. A liquor brewing wastewater treatment system according to claim 1, characterized in that: The anaerobic treatment device comprises a UASB anaerobic tower; the water outlet of the UASB anaerobic tower is connected to a medium sedimentation tank, the water outlet of the medium sedimentation tank is connected to an anoxic / aerobic treatment device, and the sludge outlet is connected to a sludge thickening tank through a sludge pipeline.

7. A liquor brewing wastewater treatment system according to any one of claims 1-6, characterized in that: The anoxic / aerobic treatment device comprises a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank and a secondary aerobic tank which are arranged in sequence, the water outlet of the primary anoxic tank is connected to the primary aerobic tank, the water outlet of the primary aerobic tank is connected to the secondary anoxic tank, the sludge outlet of the primary aerobic tank flows back to the primary anoxic tank through a sludge pipeline, the water outlet of the secondary anoxic tank is connected to the secondary aerobic tank, the water outlet of the secondary aerobic tank is connected to the secondary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected to the buffer tank.

8. A liquor brewing wastewater treatment system according to claim 7, characterized in that: The first-level aerobic pool is filled with elastic filler.

9. A liquor brewing wastewater treatment system according to claim 7, characterized in that: The primary aerobic tank and the secondary aerobic tank are both connected to the aeration fan through an aeration pipe.

10. A liquor brewing wastewater treatment system according to claim 9, characterized in that: It also includes a comprehensive equipment room, in which the aeration fan is located.

Images