Wastewater treatment system for Maotai-flavor liquor

Abstract

The utility model relates to a wastewater treatment system for Maotai-flavor liquor. The wastewater treatment system comprises a neutralization tank, an anaerobic tower, an MAP reaction tank, a multi-stage AO tank, a Fenton tank, a powdered activated carbon membrane biological reaction tank and a resin denitrification tank which are connected in sequence, the neutralization tank is connected with a liquid alkali adding device, and the water outlet end of the neutralization tank is connected with the water inlet end of the multi-stage AO tank; the anaerobic tower is provided with a biogas collecting device; the MAP reaction tank is divided into a dosing area, a reaction area and a separation area; the water outlet end of the multi-stage AO tank is connected with the water inlet end of the Fenton tank through the secondary sedimentation tank; the Fenton tank is provided with a Fenton feeding device and a Fenton stirring device; the powdered activated carbon membrane biological reaction tank is provided with a powdered activated carbon feeding device and a membrane biological reaction aeration device, and an ultrafiltration membrane separation device is arranged in the powdered activated carbon membrane biological reaction tank. The wastewater treatment system can efficiently remove COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen and total phosphorus in Maotai-flavor liquor wastewater, can recover energy and nitrogen-phosphorus fertilizers, and has considerable environmental benefits and economic benefits.

Description

Technical Field

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

[0002] Maotai-flavor liquor wastewater refers to industrial wastewater generated from the production to storage of Maotai-flavor liquor. Among them, high-concentration organic wastewater mainly includes liquor tank waste liquid, fermentation tank seepage water, grain soaking water, koji-making wastewater, etc. It is rich in long-chain organic matter such as residual sugars, organic acids, esters, alcohols, etc., and has the characteristics of high COD, BOD5, SS, ammonia nitrogen, acidic pH 3-5, and complex composition. If this Maotai-flavor liquor wastewater with high organic matter concentration and high nitrogen and phosphorus is discharged into rivers and lakes in large quantities, it will cause the dissolved oxygen in the water body to decrease, and a large number of aquatic plants and animals will die, thus leading to the deterioration of the water ecosystem. Therefore, Maotai-flavor liquor wastewater needs to be effectively treated and meet the standards before being discharged into natural water bodies. The effluent quality of the wastewater treatment system must meet the relevant standards of the "Emission Standards for Water Pollutants in Fermentation Alcohol and Liquor Industry" GB27631-2011.

[0003] The traditional Maotai-flavor liquor wastewater treatment process is mainly "pretreatment + biological treatment + deep treatment", which usually removes the total nitrogen in the wastewater by denitrification to generate nitrogen gas that escapes into the water body, and removes the total phosphorus in the wastewater by discharging a large amount of residual sludge and adding a large amount of PAC agents, which means that a large amount of carbon source needs to be added, and a large amount of solid waste secondary pollutants are generated. At the same time, deep-bed denitrification filter technology in the deep treatment system is greatly affected by changes in incoming water load and climate temperature, resulting in unstable effluent quality and substandard effluent quality.

[0004] Therefore, it is necessary to design a wastewater treatment system for Maotai-flavor liquor to overcome the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a wastewater treatment system for Maotai-flavor liquor, which can efficiently remove COD, ammonia nitrogen, total nitrogen and total phosphorus in Maotai-flavor liquor wastewater, and at the same time can recycle energy and nitrogen and phosphorus fertilizers, with considerable environmental and economic benefits.

[0006] The utility model provides a wastewater treatment system for Maotai-flavor liquor, comprising: a neutralization tank, an anaerobic tower, a MAP reaction tank, a multi-stage AO tank, a Fenton tank, a powdered activated carbon membrane biological reaction tank, and a resin denitrification tank connected in sequence; the neutralization tank is connected with a liquid alkali dosing device, and a grid or a screen is provided in front of the neutralization tank, and the water outlet of the neutralization tank is connected with the water inlet of the multi-stage AO tank; the anaerobic tower is provided with a biogas collection device; the MAP reaction tank is divided into a dosing area, a reaction area, and a separation area, and the dosing area is connected with a magnesium chloride dosing device; The device is provided, and the reaction zone is provided with a MAP stirring device; the multi-stage AO tank is provided with an AO aeration device and an AO stirring device, and the water outlet of the multi-stage AO tank is connected with the water inlet of the Fenton tank through the secondary sedimentation tank; the Fenton tank is provided with a Fenton dosing device and a Fenton stirring device, and the Fenton dosing device is used to add hydrochloric acid, ferrous sulfate, hydrogen peroxide or liquid alkali into the Fenton tank; the powdered activated carbon membrane bioreactor is provided with a powdered activated carbon dosing device and a membrane bioreactor aeration device, and the powdered activated carbon membrane bioreactor is provided with an ultrafiltration membrane separation device.

[0007] Furthermore, a gas-solid-liquid separation device and an external reflux system are provided in the anaerobic tower. The volume of the gas-solid-liquid separation device accounts for 10% to 30% of the total volume of the anaerobic tower. The reflux volume of the external reflux system is 1 to 3 times the inlet water flow rate.

[0008] Furthermore, the reaction zone of the MAP reaction tank is provided with an online monitoring system for detecting pH, ammonia nitrogen and total phosphorus.

[0009] Furthermore, the separation zone of the MAP reaction tank is connected to a struvite collection device, which is connected to the reaction zone of the MAP reaction tank through a reflux pipe. The struvite collection device is provided with a water flushing device and a vibration screening device.

[0010] Furthermore, the multi-stage AO pool is also provided with an internal recirculation system, and the internal recirculation flow rate is 1-3 times of the water inlet flow rate.

[0011] Furthermore, a sludge return system is provided between the multi-stage AO tank and the secondary sedimentation tank, and the sludge return flow rate is 0.5-1 times of the water inlet flow rate.

[0012] Furthermore, the Fenton tank and the secondary sedimentation tank are respectively connected to a sludge treatment system, which includes a sludge collection tank, a sludge thickening tank, and a sludge dewatering device.

[0013] Furthermore, the neutralization tank, anaerobic tower, multi-stage AO tank and Fenton tank are all equipped with pH online monitoring devices; the multi-stage AO tank is equipped with a dissolved oxygen online monitoring device.

[0014] Furthermore, the resin denitrification tank is connected to a resin regeneration system, which includes 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.

[0015] Furthermore, the ultrafiltration membrane separation device adopts a hollow fiber membrane component, and the membrane component is made of PVDF material.

[0016] The utility model has the following advantages and beneficial effects: (1) the biogas generated by anaerobic reaction of high concentration organic matter in wastewater can effectively recover energy; (2) the struvite precipitate generated by adding magnesium chloride to react with inorganic nitrogen and phosphorus compounds in wastewater can be recycled and used as fertilizer, and at the same time, the nitrogen and phosphorus load of subsequent biochemical pools can be reduced; (3) part of the effluent from the neutralization pool is used as the carbon source for multi-stage AO denitrification, which can effectively save the cost of adding carbon source; (4) the powdered activated carbon membrane bioreactor integrates multiple functions such as activated carbon adsorption, biological activated carbon, microbial biochemical degradation, aeration and oxygenation, membrane separation, etc., and has the characteristics of good adaptability, fast start-up, stable effluent, simple operation and management, and is suitable for the periodic changes in the water quality of liquor wastewater; (5) the resin denitrification tank can effectively reduce total nitrogen, is not affected by fluctuations in the quality and quantity of incoming water and climate change, and can ensure that the effluent water quality is stable and meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a wastewater treatment system for Maotai-flavor liquor according to a preferred embodiment of the utility model;

[0018] Description of Figure Numbers:

[0019] 101. Neutralization tank; 102. Grid and screen; 103. Liquid alkali dosing device;

[0020] 201. Anaerobic tower; 202. Gas-solid-liquid separation device; 203. Biogas collection device; 204. External reflux system;

[0021] 301, MAP reaction tank; 302, magnesium chloride dosing device; 303, struvite collecting device; 304, MAP stirring device;

[0022] 401. Multi-stage AO tank; 402. AO stirring device; 403. AO aeration device; 404. Internal reflow system; 405. Secondary sedimentation tank; 406. Sludge reflow system;

[0023] 501. Fenton tank; 502. Fenton dosing device; 503. Fenton stirring device;

[0024] 601. Powdered activated carbon membrane bioreactor tank; 602. Powdered activated carbon dosing device; 603. Membrane bioreactor aeration device; 604. Ultrafiltration membrane separation device;

[0025] 701, resin denitrification tank; 702, regeneration liquid pool; 703, regeneration waste liquid collection pool; 704, denitrification pool;

[0026] 801. Sludge treatment system. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 As shown, a wastewater treatment system for Maotai-flavor liquor comprises a neutralization tank 101, an anaerobic tower 201, a MAP reaction tank 301, a multi-stage AO tank 401, a Fenton tank 501, a powdered activated carbon membrane bioreactor 601, and a resin denitrification tank 701 which are connected in sequence.

[0029] Among them, a suspended matter removal facility is provided in front of the neutralization tank 101, including a grille and a screen 102, and the neutralization tank 101 is connected to a liquid alkali dosing device 103; the anaerobic tower 201 adopts an EGSB reactor and is provided with a biogas collection device 203, and a gas-solid-liquid separation device 202 and an external reflux system 204 are provided in the anaerobic tower 201; the MAP reaction tank 301 is divided into a dosing area, a reaction area, and a separation area, the dosing area is connected to a magnesium chloride dosing device 302, the reaction area is provided with a MAP stirring device 304, the separation area is connected to a struvite collection device 303, and a reflux pipeline is provided to reflux part of the struvite to the reaction area of ​​the MAP reaction tank 301; the multi-stage AO tank 401 is connected to an AO aeration device 403, an AO stirring device 402 is provided in the tank, and an internal reflux system 204 is provided. system 404; a sludge return system 406 is provided between the multi-stage AO tank 401 and the secondary sedimentation tank 405; the effluent from the neutralization tank 101 is transported to the multi-stage AO tank 401 as a carbon source through a pipeline valve; the Fenton tank 501 is provided with a Fenton dosing device 502 for adding hydrochloric acid, liquid alkali, hydrogen peroxide or ferrous sulfate, and a Fenton stirring device 503 is provided in the tank; the powdered activated carbon membrane bioreactor tank 601 is provided with a powdered activated carbon dosing device 602, an ultrafiltration membrane separation device 604 is provided in the tank, and a membrane bioreactor aeration device 603 is also connected; the resin denitrification tank 701 is connected to a resin regeneration system, including a regeneration liquid tank 702, a regeneration waste liquid collection tank 703, and a denitrification tank 704; and in this embodiment, two resin denitrification tanks 701 are arranged in parallel to improve the treatment efficiency.

[0030] During actual operation, the Maotai-flavor liquor wastewater passes through the grille and screen 102 to remove suspended matter and then enters the neutralization tank 101. The liquid alkali dosing device 103 adds liquid alkali to the neutralization tank 101 to adjust the pH of the wastewater to neutral. Subsequently, the wastewater enters the anaerobic tower 201 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 203. At the same time, anaerobic bacteria oxidize organic nitrogen and phosphorus compounds into inorganic nitrogen and phosphorus compounds. The anaerobic tower 201 is equipped with an external reflux system 204. The flow rate of the external reflux pump is 3 times the flow rate of the inlet water. The external reflux system 204 can reduce the inlet water load and ensure sufficient mixing in the reactor.

[0031] Then, the anaerobic effluent enters the MAP reaction tank 301, and by controlling the stirring speed to 250-280rpm, the hydraulic retention time of the reaction zone to 20-30min, the pH of the reaction zone to 9.5-10.5, the surface load of the separation zone to 5-7m3 / (m2·h), and adding magnesium chloride, it reacts with the ammonium and phosphate in the anaerobic effluent to form struvite precipitation, which can be recovered through the struvite collection device 303 and used as fertilizer, while reducing the subsequent biochemical nitrogen and phosphorus load; wherein the struvite collection device 303 also includes a water flow flushing and a vibration screening device.

[0032] The effluent from the MAP reaction tank 301 enters the multi-stage AO tank 401, and the mixed liquor from the aerobic tank is returned to the anoxic tank through the internal reflow system 404. Under the action of different populations of microorganisms, the organic matter is removed and the nitrogen and phosphorus are removed. The internal reflow rate is 1-3 times the inlet flow rate. At the same time, part of the effluent from the neutralization tank 101 flows into the multi-stage AO tank 401 through the pipeline valve, which can be used as a carbon source for the denitrification reaction. Subsequently, the activated sludge mixed liquor is separated from the mud and water in the secondary sedimentation tank 405, and part of the activated sludge is returned to the multi-stage AO tank 401 through the sludge reflow system 406, and the remaining sludge is discharged into the sludge treatment system 801. The sludge reflow rate is 0.5-1 times the inlet flow rate.

[0033] Next, the wastewater enters the Fenton tank 501, 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. Then, alkali is 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 801.

[0034] The Fenton effluent enters the powdered activated carbon membrane bioreactor 601, and the powdered activated carbon dosing device 602 adds powdered activated carbon into the tank. 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 of the ultrafiltration membrane separation device 604, a high concentration of powdered activated carbon is retained in the tank. 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, thereby regenerating the activated carbon; when the activated carbon adsorption is saturated, the concentrated carbon slurry after standing can be discharged by a fecal suction truck. Among them, the ultrafiltration membrane device adopts 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] Subsequently, the wastewater enters the resin denitrification tank 701, 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 concentration of total nitrogen in the effluent. The adsorption-saturated resin is regenerated by the regeneration liquid in the regeneration liquid tank 702, and its adsorption capacity for nitrate can be restored, so that it can continue to be used. The regeneration waste liquid generated by the regeneration enters the regeneration waste liquid collection tank 703, and then enters the denitrification tank 704. The effluent from the denitrification tank 704 flows back to the water inlet end of the previous multi-stage AO tank 401. The effluent from the denitrification tank 704 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 701 can also be replaced with a deep bed denitrification filter.

[0036] 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.

[0037] 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 wastewater treatment system for Maotai-flavor liquor, characterized in that: include: A neutralization tank, an anaerobic tower, a MAP reaction tank, a multi-stage AO tank, a Fenton tank, a powdered activated carbon membrane bioreactor, and a resin denitrification tank are connected in sequence; the neutralization tank is connected to a liquid alkali dosing device, and a grid or a screen is provided in front of the neutralization tank, and the water outlet of the neutralization tank is connected to the water inlet of the multi-stage AO tank; the anaerobic tower is provided with a biogas collection device; the MAP reaction tank is divided into a dosing area, a reaction area, and a separation area, the dosing area is connected to a magnesium chloride dosing device, and the reaction area is provided with a MAP stirring device; the multi-stage AO tank is provided with an AO aeration device and an AO stirring device, and the water outlet of the multi-stage AO tank is connected to the water inlet of the Fenton tank through a secondary sedimentation tank; the Fenton tank is provided with a Fenton dosing device and a Fenton stirring device, and the Fenton dosing device is used to add hydrochloric acid, ferrous sulfate, hydrogen peroxide or liquid alkali into the Fenton tank; the powdered activated carbon membrane bioreactor is provided with a powdered activated carbon dosing device and a membrane bioreactor aeration device, and an ultrafiltration membrane separation device is provided in the powdered activated carbon membrane bioreactor.

2. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The anaerobic tower is equipped with a gas-solid-liquid separation device and an external reflux system. The volume of the gas-solid-liquid separation device accounts for 10% to 30% of the total volume of the anaerobic tower, and the reflux volume of the external reflux system is 1 to 3 times the inlet water flow rate.

3. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The reaction area of ​​the MAP reaction tank is equipped with an online monitoring system for detecting pH, ammonia nitrogen and total phosphorus.

4. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The separation zone of the MAP reaction tank is connected with a struvite collection device, which is connected to the reaction zone of the MAP reaction tank through a reflux pipeline. The struvite collection device is provided with a water flow flushing device and a vibration screening device.

5. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The multi-stage AO pool is also equipped with an internal recirculation system, and the internal recirculation volume is 1-3 times the water inlet flow rate.

6. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: A sludge return system is set between the multi-stage AO tank and the secondary sedimentation tank, and the sludge return flow rate is 0.5-1 times the water flow rate.

7. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The Fenton tank and the secondary sedimentation tank are respectively connected to the sludge treatment system, which includes a sludge collection tank, a sludge thickening tank, and a sludge dewatering device.

8. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The neutralization tank, anaerobic tower, multi-stage AO tank and Fenton tank are all equipped with pH online monitoring devices; the multi-stage AO tank is equipped with a dissolved oxygen online monitoring device.

9. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The resin denitrification tank is connected to a resin regeneration system, which includes 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.

10. The wastewater treatment system for Maotai-flavor liquor as claimed in claim 1, characterized in that: The ultrafiltration membrane separation device adopts a hollow fiber membrane component, and the membrane component is made of PVDF material.

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