Maotai-flavor wine brewing wastewater treatment method

Abstract

The invention provides a Maotai-flavor wine brewing wastewater treatment method which comprises the following steps: separately treating cellar bottom water and other low-concentration production water, firstly, heating the high-concentration cellar bottom water to 37 DEG C in an adjusting tank, feeding the high-concentration cellar bottom water into an anaerobic reactor, and standing the cellar bottom water for not less than 15 days in the anaerobic reactor; effluent of the anaerobic reactor and effluent clear liquid of the first sedimentation tank are mixed and enter an anaerobic mixing reactor, the effluent pH of the anaerobic mixing reactor is adjusted to be smaller than 4, then the effluent enters a white rot fungus wood shaving reaction bed, filler is arranged in the white rot fungus wood shaving reaction bed and is polypropylene suspension balls, wood shavings are filled in the filler, aeration is conducted at the bottom of the white rot fungus wood shaving reaction bed, and the white rot fungus wood shaving reaction bed is obtained. Effluent enters a first-stage aerobic tank and then enters a first sedimentation tank, pollutants are further removed between the first-stage aerobic tank and the first sedimentation tank by adopting an activated sludge reflux method, and the effluent sequentially enters a second-stage anoxic tank, a second-stage aerobic tank, a second sedimentation tank, a coagulation reaction tank and an active coke filter tank to react and then is discharged. The method can obviously reduce the cellar bottom water treatment cost.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment and relates to a method for treating Maotai-flavor winemaking wastewater. Background Art

[0002] The annual production of Maotai-flavor liquor wastewater (including cleaning wastewater, bottom pot water, and bottom cellar water) is approximately 3.5 million m³ / year, with an organic matter concentration of approximately 20 g / L. Of this, bottom cellar water (with an organic matter concentration of 40-100 g / L), while accounting for less than 5% of wastewater production, contributes approximately 90% of the total wastewater pollution load. According to research, currently established processes often utilize an "anaerobic-aerobic-deep treatment (physicochemical)" approach. In practice, high influent concentrations prevent the anaerobic reactor from achieving optimal operating conditions, resulting in poor effluent quality and significant anaerobic sludge runoff. This also results in low biogas production efficiency, purity, and utilization. Furthermore, the bottom cellar wastewater contains a large amount of recalcitrant organic matter, and coupled with suboptimal front-end treatment, this leads to excessively high organic matter concentrations in the deep treatment stage. Deep treatment often utilizes the Fenton process. To ensure effluent meets standards, enormous amounts of chemicals are added, resulting in sludge production at liquor wastewater treatment plants that is approximately 20 times that of urban sewage treatment plants. The cost of treating wastewater from sauce-flavor liquor is currently about 40 to 80 yuan per ton. The high sewage treatment fees have put tremendous pressure on distilleries and the government. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for treating Maotai-flavor liquor brewing wastewater in view of the defects of the prior art, so as to reduce the process cost of treating Maotai-flavor liquor brewing wastewater.

[0004] The technical purpose of the present invention is achieved through the following technical solutions: a method for treating Maotai-flavor winemaking wastewater, which separates the bottom water from other low-concentration production water for treatment: First, the high-concentration bottom water is heated to 37°C in the regulating tank and then enters the anaerobic reactor. An internal circulation system is set up in the anaerobic reactor, and the internal circulation water is controlled between 100% and 300%. After the pit bottom water has been in the anaerobic reactor for no less than 15 days, the effluent from the anaerobic reactor is mixed with the effluent from the first sedimentation tank and fed into the anaerobic mixing reactor, where secondary anaerobic treatment, denitrification, and anaerobic ammonium oxidation reactions are carried out. The effluent from the anaerobic mixing reactor is adjusted to a pH value less than 4 before entering a white rot fungus wood shavings reactor bed. The white rot fungus wood shavings reactor bed is equipped with a filler, which is a polypropylene suspended ball. The polypropylene suspended ball filler is filled with wood shavings. Aeration is performed at the bottom of the white rot fungus wood shavings reactor bed. The white rot fungus wood shavings reactor bed is top-sprayed for water inlet and bottom-out for water outlet. The effluent is internally circulated, and the circulating water volume is controlled between 300% and 500%. At the same time, the circulating water pH is controlled between 3 and 5. The effluent from the white-rot fungus wood shavings reactor enters the primary aerobic system and then the first sedimentation tank. Activated sludge recirculation is used between the primary aerobic system and the first sedimentation tank to further remove pollutants. The supernatant effluent from the first sedimentation tank is recirculated to the anaerobic mixing reactor at a rate of 200-400%, and the sludge recirculation rate is controlled between 50% and 100%. The effluent from the first sedimentation tank is mixed with other produced water and then enters the secondary anoxic tank, secondary aerobic tank and second sedimentation tank in sequence to further remove COD, ammonia nitrogen and total nitrogen; The effluent from the second sedimentation tank enters the coagulation reaction tank, which performs coagulation, flocculation and sedimentation to remove total phosphorus and suspended SS; The effluent from the coagulation reaction tank enters the activated coke filter and can be discharged after the reaction in the activated coke filter is completed.

[0005] Preferably, before water is introduced into the white rot fungus wood shavings reaction bed, white rot fungus strains are first added to the white rot fungus wood shavings reaction bed, and the effective residence time of the white rot fungus strains in the white rot fungus wood shavings reaction bed is controlled to be greater than 10 days, so that the white rot fungi can effectively form a biofilm on the surface of the wood shavings, thereby utilizing the characteristics of the white rot fungi to remove some difficult-to-degrade COD and ammonia nitrogen.

[0006] Preferably, after the effluent from the anaerobic reactor is mixed with the effluent clear liquid from the first sedimentation tank and enters the anaerobic mixing reactor, bottom water is added during the reaction process to supplement the denitrification carbon source.

[0007] Preferably, the circulating water of the white rot fungus wood shavings reaction bed is heated and temperature-controlled so that the circulating water temperature is not lower than 25°C.

[0008] Preferably, sludge return is performed between the second sedimentation tank and the secondary anoxic tank, and the sludge return rate is controlled to be 100% to 150%.

[0009] Preferably, the surface of the polypropylene suspension ball is provided with through holes, with a hole diameter of 1-5 cm.

[0010] Preferably, the aeration intensity at the bottom of the white rot fungus wood shavings reaction bed is 1-5 m³ / m²h.

[0011] Preferably, the COD adsorption saturation of the activated coke in the activated coke filter is controlled to be greater than 200 kg / T, so that the adsorption saturation rate of the activated coke is greater than 90%.

[0012] Preferably, the other produced water is other low-concentration produced water.

[0013] Preferably, after the reaction in the activated coke filter is completed, the discharge is carried out after the following indicators are achieved: COD concentration is less than 50 mg / L, ammonia nitrogen is less than 1 mg / L, and total nitrogen is less than 15 mg / L.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention treats pit bottom water separately from other low-concentration production water, maximizing the pollutant removal limit of the anaerobic system, significantly reducing energy consumption, and effectively preventing large amounts of sludge runoff. This reduces the operating and control requirements of the anaerobic system, while also making the effluent more stable and better, significantly reducing subsequent treatment costs.

[0015] 2. The use of anaerobic mixing reactors can further improve the COD removal limit while significantly reducing the volume of nitrification and denitrification, saving floor space. At the same time, the white-rot fungus wood shavings reactor bed simulates the natural growth environment of white-rot fungi, enabling their continued growth and assisting in the degradation of some difficult-to-degrade organic matter.

[0016] 3. This method treats bottom water separately from other low-concentration production water. After the biochemical stage, COD can be reduced to 100-130 mg / L, compared to the 300-400 mg / L effluent from the conventional mixed biochemical treatment process. This reduces the requirements for subsequent advanced treatment. The final advanced treatment utilizes a fluidized bed activated coke filter to further adsorb residual, recalcitrant organic matter, ensuring consistent discharge compliance. The treatment cost is lower than that of conventional Fenton treatment processes.

[0017] 4. This system has five independent biological activated sludge systems: anaerobic sludge, anaerobic mixed sludge, white rot fungus biofilm, primary aerobic activated sludge, and secondary A / O activated sludge. The sludge in each stage is independent and synergistic, and each sludge system maximizes the advantages of microbial strains to degrade pollutants.

[0018] 5. This process reduces operating costs by more than 20% compared to traditional processes, and has great promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the system of the present invention.

[0020] Figure 2 This is a microscope photo of the white rot fungus wood shavings reaction bed filler in the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be understood as limiting this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are only for illustrative purposes and cannot be understood as limiting this patent.

[0022] First, it's necessary to clarify the terms used in this disclosure. High-concentration pit bottom water, as used herein, refers to water with a COD content greater than 100,000 mg / L. Controlling internal circulating water at 100%-300% means the ratio of internal circulating water volume to influent water volume is 100%-300%. Aeration intensity of 1-5 m³ / m²h refers to the introduction of 1-5 cubic meters of air into every cubic meter of water per hour. Throughout this disclosure, other equivalent or detailed expressions will be interpreted with reference to the above meanings.

[0023] White-rot fungi, filamentous fungi belonging to the higher basidiomycetes, are ubiquitous in nature. They inhabit trees and wood, decomposing wood fibers and ultimately forming a white, spongy substance. They are capable of degrading environmentally hazardous substances such as halogenated compounds, organochlorine pesticides, polycyclic aromatic hydrocarbons, azo dyes, and polychlorinated biphenyls (PCBs). They exhibit significant biosorption capacity for heavy metal ions and synthetic dyes, and possess a broad range of phenolic compound degradation capabilities and unique resistance to biotoxicity. Therefore, white-rot fungi have enormous potential for treating toxic and recalcitrant industrial wastewater.

[0024] Activated coke, a porous carbonaceous material, offers significant advantages over other similar materials. Its high mechanical strength allows it to withstand significant forces without breaking. Its relatively simple regeneration process reduces costs and resource loss. Its low price also reduces the financial burden on businesses when deployed on a large scale. Activated coke possesses a highly developed pore structure and a rich surface rich in functional groups, enabling it to more effectively adsorb harmful substances from wastewater. Therefore, activated coke presents a promising future for its application in wastewater treatment.

[0025] As an embodiment of the present invention, refer to Figure 1 This embodiment provides a method for treating Maotai-flavor liquor wastewater, which separates the bottom water from other low-concentration production water for treatment: First, the high-concentration bottom water is heated to 37°C in the regulating tank and then enters the anaerobic reactor. An internal circulation system is set up in the anaerobic reactor, and the internal circulation water is controlled between 100% and 300%. After the pit bottom water has been retained in the anaerobic reactor for no less than 15 days, the effluent from the anaerobic reactor is mixed with the clear effluent from the first sedimentation tank and fed into the anaerobic mixing reactor for secondary anaerobic treatment and denitrification and anaerobic ammonium oxidation reactions. A traditional three-phase separator design can be used at the top of the anaerobic reactor. The reactor sludge concentration is 30-50 g / L, which can greatly reduce the floor space and can efficiently remove organic matter and total nitrogen. After this treatment step, the effluent COD concentration is 1500-2500 mg / L and the total nitrogen is 300-400 mg / L.

[0026] The effluent pH of the anaerobic mixing reactor is then adjusted to less than 4 before entering the white rot fungus wood shavings reaction bed. The white rot fungus wood shavings reaction bed is filled with a filler, which is a polypropylene suspension ball. The polypropylene suspension ball filler is filled with wood shavings. The microscope photo of the filler in the white rot fungus wood shavings reaction bed is as follows: Figure 2 As shown, aeration is performed at the bottom of the white rot fungus wood shavings reaction bed. The white rot fungus wood shavings reaction bed adopts the top spraying method to enter the water and the bottom to discharge the water. The effluent is internally circulated, and the circulating water volume is controlled between 300% and 500%. At the same time, the pH of the circulating water is controlled between 3 and 5. The effluent from the white-rot fungus wood shavings reactor enters the primary aerobic system and then the first sedimentation tank. Activated sludge recirculation is used between the primary aerobic system and the first sedimentation tank to further remove pollutants. The supernatant effluent from the first sedimentation tank is recirculated to the anaerobic mixing reactor at a rate of 200-400%, and the sludge recirculation rate is controlled between 50% and 100%. The effluent from the first sedimentation tank is mixed with other produced water and then enters the secondary anoxic tank, secondary aerobic tank and second sedimentation tank in sequence to further remove COD, ammonia nitrogen and total nitrogen; The effluent from the second sedimentation tank enters the coagulation reaction tank, which performs coagulation, flocculation, and sedimentation to remove total phosphorus and suspended SS. After this treatment process, the effluent COD concentration is 90-120 mg / L and the total phosphorus is less than 0.3 mg / L. The effluent from the coagulation reaction tank enters the activated coke filter and can be discharged after the reaction in the activated coke filter is completed.

[0027] Traditional processes do not distinguish between high-concentration and low-concentration pit bottom water, resulting in high costs when using the same process to treat wastewater. This method, by separating the wastewater for treatment, reduces the amount of water heated to the anaerobic reactor by 10 times compared to traditional methods, significantly reducing energy consumption. The load in the three-phase separation and clarification area is also reduced by 10 times, effectively preventing excessive sludge buildup. The influent COD concentration of pit bottom water ranges from 200,000 to 300,000 mg / L, ammonia nitrogen from 900 to 1,100 mg / L, total nitrogen from 1,100 to 1,500 mg / L, and total phosphorus from 300 to 500 mg / L. After this treatment step, the effluent COD concentration is 2,000 to 4,000 mg / L.

[0028] In some preferred embodiments, before water enters the white-rot fungus wood shavings reaction bed, white-rot fungus strains are first added to the white-rot fungus wood shavings reaction bed, and the effective residence time of the white-rot fungus strains in the white-rot fungus wood shavings reaction bed is controlled to be greater than 10 days, so that the white-rot fungi can effectively form a biofilm on the surface of the wood shavings, so as to utilize the characteristics of white-rot fungi to remove some difficult-to-degrade COD and ammonia nitrogen. After this treatment link, the effluent COD concentration is 1200~1800mg / L, and the ammonia nitrogen concentration is 50~200mg / L.

[0029] In some embodiments, the effluent from the anaerobic reactor is mixed with the effluent clear liquid from the first sedimentation tank and enters the anaerobic mixing reactor, and bottom water is added during the reaction to supplement the denitrification carbon source.

[0030] In some embodiments, the circulating water in the white rot fungus wood shavings reaction bed is heated and temperature controlled so that the circulating water temperature is not lower than 25°C.

[0031] In some preferred embodiments, sludge is returned between the second sedimentation tank and the secondary anoxic tank, and the sludge return rate is controlled to be 100% to 150%.

[0032] In some preferred embodiments, the surface of the polypropylene suspension ball is provided with through holes, with a hole diameter of 1-5 cm.

[0033] In some preferred embodiments, the aeration intensity at the bottom of the white rot fungus wood shavings reaction bed is 1-5 m³ / m²h.

[0034] In some preferred embodiments, the activated coke filter is controlled to have a COD adsorption saturation capacity greater than 200 kg / T, and an activated coke adsorption saturation rate greater than 90%.

[0035] In some preferred embodiments, the other produced water is other low-concentration produced water, and the inlet COD concentration of the other produced water is 100-500 mg / L, ammonia nitrogen 10-30 mg / L, total nitrogen 20-50 mg / L, and total phosphorus 200-300 mg / L. The outlet COD concentration is 100-130 mg / L, ammonia nitrogen 1-5 mg / L, and total nitrogen 20-30 mg / L. In some preferred embodiments, after the reaction in the activated coke filter is completed, the discharge is carried out after the following indicators are achieved: COD concentration <50 mg / L, ammonia nitrogen less than 1 mg / L, and total nitrogen less than 15 mg / L.

[0036] In some preferred embodiments, the activated coke filter is in the form of a fluidized bed, and the height / diameter ratio of the fluidized bed is greater than 3.5.

[0037] The present invention treats the bottom water of the pit separately from other low-concentration production water, thereby maximizing the pollutant removal limit of the anaerobic system, greatly reducing energy consumption, and effectively avoiding large amounts of sludge leakage, thereby reducing the operation and control requirements of the anaerobic system and making the effluent more stable and better, which has a great positive impact on reducing subsequent treatment costs.

[0038] When treating the bottom water of a certain liquor production plant, the process of the present invention was compared with the traditional process. After using the same bottom water composition and achieving basically the same emission indicators, the costs generated by the two different processes were calculated and compared respectively. The statistical results are shown in the table below.

[0039] Pollutant removal and operation costs of each part of this process system (Wastewater composition: pit bottom water 100m3 / d, other production wastewater 900m3 / d)

[0040] Pollutant removal and operating costs of various parts of traditional process systems (Wastewater composition: pit bottom water 100m 3 / d, other production wastewater 900m 3 / d)

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for treating Maotai-flavor brewing wastewater, characterized in that: Treat the bottom water of the pit separately from other low-concentration production water: First, the high-concentration bottom water is heated to 37°C in the regulating tank and then enters the anaerobic reactor. An internal circulation system is set up in the anaerobic reactor, and the internal circulation water is controlled between 100% and 300%. After the pit bottom water has been in the anaerobic reactor for no less than 15 days, the effluent from the anaerobic reactor is mixed with the effluent from the first sedimentation tank and fed into the anaerobic mixing reactor, where secondary anaerobic treatment, denitrification, and anaerobic ammonium oxidation reactions are carried out. The effluent from the anaerobic mixing reactor is adjusted to a pH value less than 4 before entering a white rot fungus wood shavings reactor bed. The white rot fungus wood shavings reactor bed is equipped with a filler, which is a polypropylene suspended ball. The polypropylene suspended ball filler is filled with wood shavings. Aeration is performed at the bottom of the white rot fungus wood shavings reactor bed. The white rot fungus wood shavings reactor bed is top-sprayed for water inlet and bottom-out for water outlet. The effluent is internally circulated, and the circulating water volume is controlled between 300% and 500%. At the same time, the circulating water pH is controlled between 3 and 5. The effluent from the white-rot fungus wood shavings reactor enters the primary aerobic system and then the first sedimentation tank. Activated sludge recirculation is used between the primary aerobic system and the first sedimentation tank to further remove pollutants. The supernatant effluent from the first sedimentation tank is recirculated to the anaerobic mixing reactor at a rate of 200-400%, and the sludge recirculation rate is controlled between 50% and 100%. The effluent from the first sedimentation tank is mixed with other produced water and then enters the secondary anoxic tank, secondary aerobic tank and second sedimentation tank in sequence to further remove COD, ammonia nitrogen and total nitrogen; The effluent from the second sedimentation tank enters the coagulation reaction tank, which performs coagulation, flocculation and sedimentation to remove total phosphorus and suspended SS; The effluent from the coagulation reaction tank enters the activated coke filter and can be discharged after the reaction in the activated coke filter is completed.

2. A method for treating Maotai-flavor brewing wastewater according to claim 1, characterized in that: Before water is introduced into the white-rot fungus wood shavings reactor bed, white-rot fungus strains are first added to the white-rot fungus wood shavings reactor bed to control the effective residence time of the white-rot fungus strains in the white-rot fungus wood shavings reactor bed to be greater than 10 days, so that the white-rot fungi can effectively form a biofilm on the surface of the wood shavings, thereby utilizing the characteristics of the white-rot fungi to remove some difficult-to-degrade COD and ammonia nitrogen.

3. A method for treating Maotai-flavor brewing wastewater according to claim 1, characterized in that: The effluent from the anaerobic reactor is mixed with the effluent clear liquid from the first sedimentation tank and enters the anaerobic mixing reactor. Bottom water is added during the reaction to supplement the denitrification carbon source.

4. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: The circulating water of the white rot fungus wood shavings reaction bed is heated and temperature controlled to ensure that the circulating water temperature is not lower than 25°C.

5. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: Sludge return is carried out between the second sedimentation tank and the secondary anoxic tank, and the sludge return rate is controlled at 100%~150%.

6. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: The surface of the polypropylene suspension ball is provided with through holes, with a hole diameter of 1-5 cm.

7. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: The aeration intensity at the bottom of the white rot wood shavings reaction bed is 1~5 m³ / m²h.

8. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: The activated coke filter is controlled to have an activated coke adsorption saturation of COD greater than 200 kg / T, and an activated coke adsorption saturation rate greater than 90%.

9. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: The other produced water mentioned is other low-concentration produced water.

10. The method for treating Maotai-flavor brewing wastewater according to claim 1, wherein: After the reaction in the activated coke filter is completed, the discharge is carried out after the following indicators are met: COD concentration <50mg / L, ammonia nitrogen less than 1mg / L, and total nitrogen less than 15mg / L.

Images