White spirit wastewater treatment system

Abstract

The utility model relates to a white spirit wastewater treatment system which comprises a neutralization tank, a coagulative precipitation tank, a hydrolysis acidification tank, an anaerobic reactor, an AOAO tank, a Fenton reaction tank, a powdered activated carbon membrane bioreactor and a resin denitrification tank which are sequentially connected, and the water outlet end of the powdered activated carbon membrane bioreactor is connected with the water inlet end of a nanofiltration device; a filler and a hydrolysis stirring device are arranged in the hydrolysis acidification pool; the water outlet end of the AOAO tank is connected with the water inlet end of the Fenton reaction tank through the secondary sedimentation tank, and the water outlet end of the hydrolysis acidification tank is connected with the water inlet end of the AOAO tank; a reaction stirring device is arranged in the Fenton reaction tank, and the Fenton reaction tank is connected with a reaction feeding device; the powdered activated carbon membrane biological reaction tank is provided with a powdered activated carbon feeding device, an ultrafiltration membrane separation device and a membrane biological reaction aeration device; the concentrated water end of the nanofiltration device is connected with the water inlet end of the neutralization tank. The wastewater treatment system can efficiently remove COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen and total phosphorus in the white spirit wastewater, and prevents the white spirit wastewater from being discharged into a natural water body to cause environmental pollution.

Description

Technical Field

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

[0002] For every 1,000 liters of liquor produced, 12 to 20 tons of liquor production process wastewater will be discharged. These wastewaters can be divided into high-concentration and low-concentration organic wastewaters. Among them, high-concentration wastewater includes: koji-making wastewater, pot bottom water, cellar bottom water, lees waste liquid, and grain soaking wastewater. These wastewaters have the characteristics of high COD, BOD5, SS, ammonia nitrogen, acidic pH 3 to 5, and complex components. The main components are water, fatty acids, amino acids, low-carbon alcohols, etc. Low-concentration wastewater includes: forced drainage of the cooling system, packaging workshop wastewater, floor washing water, etc. If the liquor production process wastewater is not treated or is not discharged up to standard, it will increase the pollution load of the water body and cause adverse effects such as ecological environmental damage.

[0003] Therefore, it is necessary to design a liquor wastewater treatment system to overcome the above problems. Utility Model Content

[0004] The utility model aims to provide a liquor wastewater treatment system, which can efficiently remove COD, ammonia nitrogen, total nitrogen and total phosphorus in liquor wastewater, and avoid the liquor wastewater from being discharged into natural water bodies and causing environmental pollution.

[0005] The utility model provides a liquor wastewater treatment system, comprising: a neutralization tank, a coagulation sedimentation tank, a hydrolysis acidification tank, an anaerobic reactor, an AOAO tank, a Fenton reaction tank, a powdered activated carbon membrane bioreactor and a resin denitrification tank which are connected in sequence, and the water outlet of the powdered activated carbon membrane bioreactor is connected to the water inlet of a nanofiltration device; a neutralization stirring device is provided in the neutralization tank and is connected to a liquid alkali dosing device; the coagulation sedimentation tank is divided into a dosing area, a reaction area and a sedimentation area in sequence, the dosing area is connected to a PAC and PAM dosing device, and the reaction area is provided with a coagulation stirring device; a hydrolysis acidification tank is provided A filler and a hydrolysis stirring device are provided; the outlet of the AOAO tank is connected to the inlet of the Fenton reaction tank through the secondary sedimentation tank, an AOAO aeration device and an AOAO stirring device are provided in the AOAO tank, and the outlet of the hydrolysis acidification tank is connected to the inlet of the AOAO tank; a reaction stirring device is provided in the Fenton reaction tank, and a reaction dosing device is connected to add hydrochloric acid, ferrous sulfate, hydrogen peroxide or liquid alkali; the powdered activated carbon membrane bioreactor is provided with a powdered activated carbon dosing device, an ultrafiltration membrane separation device and a membrane bioreactor aeration device; the concentrate end of the nanofiltration device is connected to the inlet of the neutralization tank.

[0006] Furthermore, a suspended matter removal facility is provided in front of the neutralization tank, which is a grid or a screen.

[0007] Furthermore, the AOAO tank is provided with an AOAO internal reflow system, and an AOAO sludge reflow system is provided between the AOAO tank and the secondary sedimentation tank.

[0008] Furthermore, the Fenton reaction tank is divided into a dosing zone, a reaction zone, and a precipitation zone. The dosing zone is connected to a reaction dosing device, and a reaction stirring device is arranged in the reaction zone of the Fenton reaction tank.

[0009] Furthermore, the resin denitrification tank is connected to a resin regeneration system, including a regeneration liquid pool, a regeneration waste liquid collection pool, and a denitrification pool. The regeneration liquid pool and the regeneration waste liquid collection pool are respectively connected to the resin denitrification tank, and the denitrification pool is connected to the regeneration waste liquid collection pool.

[0010] Furthermore, the anaerobic reactor adopts an EGSB reactor and is provided with a biogas collection device.

[0011] Furthermore, the anaerobic reactor is provided with a gas-solid-liquid separation device and an external circulation system.

[0012] Furthermore, the volume of the gas-solid-liquid separation device accounts for 10% to 30% of the total volume of the anaerobic reactor, and the flow rate of the external circulation system is 1 to 3 times the water flow rate.

[0013] Furthermore, the sewage discharge ends of the secondary sedimentation tank and the Fenton reaction tank are respectively connected to the sludge treatment system.

[0014] Furthermore, the anaerobic reactor and the AOAO tank are provided with an online pH monitoring device and an online dissolved oxygen monitoring device.

[0015] The utility model has the following advantages and beneficial effects: (1) organic pollutants in liquor wastewater are metabolized by anaerobic bacteria to generate biogas, which is a recyclable energy source; (2) the effluent from the hydrolysis acidification tank has good biodegradability, and using the effluent from the hydrolysis acidification tank as a carbon source for denitrification can effectively save carbon source costs; (3) the powdered activated carbon membrane bioreactor prolongs the residence time of the powdered activated carbon in the tank through the interception effect of the ultrafiltration membrane, so that the ultra-high concentration of powdered activated carbon is maintained in the tank, and the adsorption effect of the powdered activated carbon is fully exerted; (4) powdered biological activated carbon can be formed in the powdered activated carbon membrane bioreactor, and ammonia nitrogen can be further reduced through the action of microorganisms; (5) the resin denitrification tank can effectively reduce total nitrogen by removing nitrate ions, and is not affected by fluctuations in the quality and quantity of incoming water and climate change, so as to ensure that the effluent water quality is stable and meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a liquor wastewater treatment system according to a preferred embodiment of the utility model;

[0017] Description of Figure Numbers:

[0018] 101. Neutralization tank; 102. Liquid alkali dosing device; 103. Neutralization stirring device;

[0019] 201. Coagulation sedimentation tank; 202. PAC, PAM dosing device; 203. Coagulation stirring device;

[0020] 301. hydrolysis acidification tank; 302. filler; 303. hydrolysis stirring device;

[0021] 401. anaerobic reactor; 402. gas-solid-liquid separation device; 403. biogas collection device; 404. external circulation system;

[0022] 501, AOAO tank; 502, AOAO aeration device; 503, AOAO internal reflow system; 504, AOAO stirring device; 505, secondary sedimentation tank; 506, AOAO sludge reflow system;

[0023] 601. Fenton reaction tank; 602. reaction stirring device; 603. reaction dosing device;

[0024] 701. Powdered activated carbon membrane bioreactor; 702. Membrane bioreactor aeration device; 703. Powdered activated carbon dosing device; 704. Ultrafiltration membrane separation device;

[0025] 801, resin denitrification tank; 802, regeneration liquid pool; 803, denitrification pool; 804, regeneration waste liquid collection pool;

[0026] 901. Nanofiltration device;

[0027] 1001. Sludge treatment system. DETAILED DESCRIPTION

[0028] For a better understanding of the present invention, the following embodiments are further explanations of the present invention, but the content of the present invention is not limited to the following embodiments.

[0029] like Figure 1 As shown, a liquor wastewater treatment system includes: a neutralization tank 101, a coagulation sedimentation tank 201, a hydrolysis acidification tank 301, an anaerobic reactor 401, an AOAO tank 501, a Fenton reaction tank 601, a powdered activated carbon membrane bioreactor 701, a resin denitrification tank 801, and a nanofiltration device 801 parallel to the resin denitrification tank 801, which are connected in sequence.

[0030] Among them, the neutralization tank 101 is connected to a liquid alkali dosing device 102 and a neutralization stirring device 103, and a suspended matter removal facility including a grid and a screen is provided in front of the neutralization tank 101. The coagulation sedimentation tank 201 is divided into a dosing area, a reaction area, and a sedimentation area. The dosing area is connected to a PAC and PAM dosing device 202, and the reaction area is provided with a coagulation stirring device 203. The hydrolysis acidification tank 301 is provided with a filler 302 and a hydrolysis stirring device 303; the anaerobic reactor 401 adopts an EGSB reactor, is provided with a biogas collection device 403, and is provided with a gas-solid-liquid separation device 402 and an external circulation system 404 on the anaerobic reactor 401. The AOAO tank 501 is connected to an AOAO aeration device 502, an AOAO stirring device 504 is provided in the tank, and an AOAO internal reflow system 503 is also provided; an AOAO sludge reflow system 506 is provided between the AOAO tank 501 and the secondary sedimentation tank 505; the effluent from the hydrolysis acidification tank 301 is transported to the AOAO tank 501 as a carbon source through pipeline valves. The Fenton reaction tank 601 is divided into a dosing area, a reaction area, and a precipitation area. The dosing area is connected to a reaction dosing device 603 for adding hydrochloric acid, ferrous sulfate, hydrogen peroxide or liquid alkali, and the reaction area is also provided with a reaction stirring device 602. The powdered activated carbon membrane bioreactor tank is provided with a powdered activated carbon dosing device 703, an ultrafiltration membrane separation device 704 is provided in the tank, and a membrane bioreactor aeration device 702 is also connected. The resin denitrification tank 801 is connected to a resin regeneration system, including a regeneration liquid pool 802, a regeneration waste liquid collection pool 804, and a denitrification pool 803; a nanofiltration device 801 is arranged in parallel with the resin denitrification tank 801, and the concentrated water end of the nanofiltration device 801 is connected to the water inlet end of the neutralization tank 101; and in this embodiment, two resin denitrification tanks 801 are arranged in parallel to improve the processing efficiency.

[0031] During the actual operation, the liquor wastewater enters the neutralization tank 101 after passing through the grille and screen to remove suspended matter. The alkali dosing device 102 adds alkali to the neutralization tank 101 to adjust the pH of the wastewater to neutral. The effluent from the neutralization tank 101 enters the coagulation sedimentation tank 201, where PAC and PAM are added to remove suspended matter and preliminarily remove total phosphorus. Subsequently, the wastewater enters the hydrolysis acidification tank 301. Under the action of the hydrolysis acidification bacteria attached to the filler 302, the macromolecular substances are converted into small molecular substances, thereby improving the biodegradability of the wastewater. The wastewater enters the EGSB reactor through a pump for anaerobic treatment. Under the metabolic action of anaerobic bacteria, organic matter is metabolized and decomposed to produce biogas, which is recovered through the biogas collection device 403. The EGSB reactor is provided with an external circulation system 404. The flow rate of the external circulation pump is twice the flow rate of the inlet water. The external circulation system 404 can reduce the inlet water load and ensure sufficient mixing in the reactor.

[0032] Then, the anaerobic effluent enters the AOAO pool 501, and the mixed liquor of the aerobic pool is returned to the anoxic pool through the AOAO internal reflow system 503. Under the action of different populations of microorganisms, the removal of organic matter and denitrification and phosphorus removal are completed. The AOAO internal reflow volume is 1-3 times the inlet flow rate. At the same time, part of the effluent from the hydrolysis acidification pool 301 flows into the AOAO pool 501 through the pipeline valve, which can be used as a carbon source for the denitrification reaction. The activated sludge mixed liquor is separated into mud and water in the secondary sedimentation tank 505, and part of the activated sludge is returned to the AOAO pool 501 through the AOAO sludge reflow system 506, and the remaining sludge is discharged into the sludge treatment system 1001. The sludge reflow volume is 0.5-1 times the inlet flow rate.

[0033] Next, the wastewater enters the Fenton reaction tank 601, where acid is added to adjust the wastewater to acidity, and ferrous sulfate and hydrogen peroxide are added in turn and stirred evenly, so that a Fenton oxidation reaction occurs in the wastewater to further remove COD in the wastewater. Alkali is then added to adjust the pH of the wastewater to neutral to generate precipitation, and the chemical sludge generated by the Fenton reaction enters the sludge treatment system 1001.

[0034] The effluent from the Fenton reaction enters the powdered activated carbon membrane bioreactor 701, and the powdered activated carbon dosing device 703 adds powdered activated carbon therein. Under the action of aeration, the powdered activated carbon is mixed with the wastewater, and COD is further removed by adsorption. At the same time, due to the separation effect of the ultrafiltration membrane separation device 704, high-concentration powdered activated carbon can be retained, and the microorganisms living on the surface of the powdered activated carbon will further reduce the ammonia nitrogen in the wastewater through metabolism, and the microorganisms will also degrade the organic matter adsorbed on the surface of the activated carbon; when the activated carbon adsorption is saturated, the concentrated carbon slurry after standing can be discharged by a fecal suction truck. The ultrafiltration membrane separation device 704 uses a hollow fiber membrane component, and the membrane component is made of PVDF. The operation mode is to produce water for 9 minutes, backwash for 1 minute, and then produce water, and circulate in sequence.

[0035] The effluent from the powdered activated carbon membrane bioreactor 701 enters the resin denitrification tank 801, where the nitrate in the wastewater is exchanged with the chloride ions in the denitrification resin and adsorbed onto the macroporous resin, thereby reducing the total nitrogen concentration in the effluent; the saturated resin is regenerated with the regeneration liquid to restore its adsorption capacity for nitrates, so that it can continue to be used. The regeneration waste liquid generated by the regeneration enters the regeneration waste liquid collection tank 804, and then enters the denitrification tank 803. The effluent from the denitrification tank 803 flows back to the water inlet end of the previous AOAO tank 501. The effluent from the denitrification tank 803 in the resin regeneration system can also be mixed with the effluent from the resin tank and discharged into the next process. When the salinity of the wastewater is high, the resin denitrification tank 801 can also be replaced with a deep bed denitrification filter.

[0036] The effluent from the powdered activated carbon membrane bioreactor 701 is controlled by a valve and may not enter the resin denitrification tank 801 but enter the nanofiltration device 801 , and the concentrated water from the nanofiltration device 801 flows back to the water inlet end of the neutralization tank 101 .

[0037] For large-scale liquor wastewater treatment plants, a plate and frame filter press can be used to separate carbon from cement water, and then the waste powdered activated carbon can be thermally regenerated and recycled.

[0038] The above is only a preferred implementation of the present utility model, which certainly cannot be used to limit the scope of rights of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present utility model, and these improvements and changes are also regarded as the protection scope of the present utility model.

Claims

1. A liquor wastewater treatment system, characterized in that: include: The neutralization tank, coagulation sedimentation tank, hydrolysis acidification tank, anaerobic reactor, AOAO tank, Fenton reaction tank, powdered activated carbon membrane bioreactor and resin denitrification tank are connected in sequence, and the water outlet of the powdered activated carbon membrane bioreactor is connected to the water inlet of the nanofiltration device; the neutralization tank is provided with a neutralization stirring device and is connected with a liquid alkali dosing device; the coagulation sedimentation tank is divided into a dosing area, a reaction area and a sedimentation area in sequence, the dosing area is connected with PAC and PAM dosing devices, and the reaction area is provided with a coagulation stirring device; the hydrolysis acidification tank is provided with a filler and a hydrolysis stirring device The outlet of the AOAO tank is connected to the inlet of the Fenton reaction tank through the secondary sedimentation tank. The AOAO tank is provided with an AOAO aeration device and an AOAO stirring device. The outlet of the hydrolysis acidification tank is connected to the inlet of the AOAO tank. The Fenton reaction tank is provided with a reaction stirring device, and is connected with a reaction dosing device for adding hydrochloric acid, ferrous sulfate, hydrogen peroxide or liquid alkali. The powdered activated carbon membrane bioreactor is provided with a powdered activated carbon dosing device, an ultrafiltration membrane separation device and a membrane bioreactor aeration device. The concentrate end of the nanofiltration device is connected to the inlet of the neutralization tank.

2. The liquor wastewater treatment system as claimed in claim 1, characterized in that: A facility for removing suspended matter is provided in front of the neutralization tank, which is a grid or a screen.

3. The liquor wastewater treatment system as described in claim 1, characterized in that: The AOAO pool is equipped with an AOAO internal reflow system, and an AOAO sludge reflow system is set between the AOAO pool and the secondary sedimentation tank.

4. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The Fenton reaction tank is divided into a dosing zone, a reaction zone, and a precipitation zone. The dosing zone is connected to a reaction dosing device, and a reaction stirring device is arranged in the reaction zone of the Fenton reaction tank.

5. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The resin denitrification tank is connected with a resin regeneration system, including a regeneration liquid pool, a regeneration waste liquid collection pool, and a denitrification pool. The regeneration liquid pool and the regeneration waste liquid collection pool are respectively connected with the resin denitrification tank, and the denitrification pool is connected with the regeneration waste liquid collection pool.

6. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The anaerobic reactor adopts EGSB reactor and is equipped with a biogas collection device.

7. The liquor wastewater treatment system as claimed in claim 6, characterized in that: The anaerobic reactor is equipped with a gas-solid-liquid separation device and an external circulation system.

8. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The volume of the gas-solid-liquid separation device accounts for 10% to 30% of the total volume of the anaerobic reactor, and the flow rate of the external circulation system is 1 to 3 times the water flow rate.

9. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The sewage discharge ends of the secondary sedimentation tank and the Fenton reaction tank are respectively connected to the sludge treatment system.

10. The liquor wastewater treatment system as claimed in claim 1, characterized in that: The anaerobic reactor and AOAO tank are equipped with pH online monitoring devices and dissolved oxygen online monitoring devices.

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