Wastewater treatment system and white spirit production wastewater treatment method

Abstract

The invention discloses a wastewater treatment system and a treatment method of white spirit production wastewater. The wastewater treatment system comprises a first pretreatment system, an anaerobic treatment system, a biochemical system and a deep treatment system which are connected in sequence; the anaerobic treatment system comprises an anaerobic reactor and an anaerobic sedimentation tank which are connected in sequence. Wherein the anaerobic reactor is respectively connected with the anaerobic sedimentation tank through the first water outlet and the second water inlet, so that the sediment after the anaerobic reaction can return to the anaerobic reactor again, and the anaerobic treatment system can reuse microorganisms in the sediment.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a wastewater treatment system and a method for treating wastewater from liquor production. Background Art

[0002] Liquor wastewater is a high-concentration organic wastewater, which contains a large amount of complex organic matter such as starch, sugar, protein, etc. Direct discharge will lead to serious environmental problems such as eutrophication of water bodies and microbial toxic pollution.

[0003] When traditional wastewater treatment systems treat liquor wastewater, a large amount of organic matter is not properly utilized and is treated as pollutants, resulting in low economic benefits for the wastewater treatment system. Summary of the Invention

[0004] Based on this, it is necessary to provide a wastewater treatment system that can recycle organic matter and microorganisms in liquor wastewater and a method for treating liquor production wastewater.

[0005] In a first aspect of the present application, a wastewater treatment system is provided.

[0006] A wastewater treatment system comprises a first pretreatment system, an anaerobic treatment system, a biochemical system, and a deep treatment system connected in sequence, wherein liquor wastewater flows from the first pretreatment system and is sequentially treated by the first pretreatment system, the anaerobic treatment system, the biochemical system, and the deep treatment system before being discharged from the deep treatment system; the first pretreatment system is used for coarse filtering of the liquor wastewater, the anaerobic treatment system is used for purifying the liquor wastewater through a microbial anaerobic process, the biochemical system is used for purifying the liquor wastewater through a biological denitrification and phosphorus removal process, and the deep treatment system is used for purifying the liquor wastewater through an oxidation process;

[0007] The anaerobic treatment system includes an anaerobic reactor and an anaerobic sedimentation tank connected in sequence; the anaerobic reactor includes a first water inlet, a first water outlet and a second water inlet, the first water inlet is used to receive the white wine wastewater treated by the first pretreatment system, the first water outlet is connected to the anaerobic sedimentation tank, and the second water inlet is connected to the anaerobic sedimentation tank to allow the sediment to flow back to the anaerobic reactor; the anaerobic sedimentation tank includes a first mud discharge port and a second water outlet, the first mud discharge port is connected to the second water inlet, and the second water outlet is connected to the biochemical system.

[0008] In some embodiments, the first pretreatment system includes a first water collection tank and a first coagulation tank, and the anaerobic treatment system further includes an intermediate tank;

[0009] The first water collection tank is connected to the first coagulation tank with a filter grating therebetween, and the filter grating is used for preliminarily filtering the liquor wastewater flowing from the first water collection tank to the first coagulation tank;

[0010] The first coagulation tank is used to coagulate the liquor wastewater. The first coagulation tank is connected to the intermediate tank so that the supernatant of the coagulated and precipitated liquor wastewater flows into the intermediate tank; the intermediate tank is connected to the first water inlet of the anaerobic reactor.

[0011] In some embodiments, the wastewater treatment system also includes a first power generation system, which includes a sludge thickening tank, a dehydrator, a dryer and an incineration power generation device connected in sequence; the sludge thickening tank is connected to the second mud outlet of the first coagulation tank to collect the sludge coagulated and precipitated by the liquor wastewater and use it for power generation.

[0012] In some embodiments, the biochemical system includes a biological denitrification and phosphorus removal tank and a MABR-MBR coupling system connected to each other; the biological denitrification and phosphorus removal tank is connected to the anaerobic treatment system, and the MABR-MBR coupling system is connected to the deep treatment system.

[0013] In some embodiments, the wastewater treatment system also includes a second pretreatment system for treating high-concentration liquor wastewater, the pretreatment system includes a second water collection tank, a second coagulation tank and a carbon collection tank connected in sequence, the carbon collection tank is connected to the biological denitrification and phosphorus removal tank to provide a carbon source, and the second water collection tank is used to store high-concentration liquor wastewater.

[0014] In some embodiments, the deep treatment system includes an ozone advanced oxidizer and an aerated biological filter connected in sequence; the ozone advanced oxidizer is connected to the biochemical system, and the liquor wastewater is discharged from the wastewater treatment system after being treated in the aerated biological filter.

[0015] In some embodiments, the wastewater treatment system further comprises a second power generation system, which comprises a water seal tank, a dehydration tank, a desulfurization tank, a gas storage tank and a combustion power generation device connected in sequence, wherein the water seal tank is connected to the gas outlet of the anaerobic reactor to collect biogas and use it for power generation; and / or

[0016] The wastewater treatment system also includes an auxiliary treatment system; the auxiliary treatment system includes a digestate storage tank and a regulating tank that are interconnected. The digestate storage tank is connected to the second water outlet of the anaerobic reactor so that the digestate generated by the anaerobic reaction flows into the auxiliary treatment system. The regulating tank is used to adjust the pH of the digestate, filter heavy metal impurities and adjust the organic matter content.

[0017] In a second aspect, the present application provides a method for treating wastewater from liquor production.

[0018] A method for treating liquor production wastewater, using the above-mentioned wastewater treatment system, comprises the following steps:

[0019] Adding liquor wastewater into the first pretreatment system, performing coagulation treatment on the liquor wastewater, and performing solid-liquid separation to obtain a first precipitate and a first treated liquid;

[0020] Passing the first treated liquid into an anaerobic reactor to obtain a digestate through anaerobic reaction, passing the digestate into an anaerobic sedimentation tank through a first water outlet, separating solid, liquid and gas to obtain a biogas mixture, a second precipitate and a supernatant, and returning the second precipitate to the anaerobic reactor through a first mud discharge outlet;

[0021] The supernatant is introduced into a biochemical system through a second water outlet, the supernatant is subjected to biological denitrification and dephosphorization treatment, and solid-liquid separation is performed to obtain a third precipitate and a second treated liquid;

[0022] The second treated liquid is passed into a deep treatment system, and the liquor wastewater treated liquid is oxidized and filtered to obtain dischargeable treated water.

[0023] In some embodiments, one or more of the first precipitate, the second precipitate, and the third precipitate are introduced into a first power generation system for incineration power generation; and / or

[0024] The biogas mixture is introduced into a second power generation system for biogas power generation.

[0025] In some embodiments, wastewater obtained from different liquor production processes is divided into liquor wastewater and high-concentration liquor wastewater according to a set chemical oxygen demand, and the chemical oxygen demand of the high-concentration liquor wastewater is higher than the chemical oxygen demand of the liquor wastewater;

[0026] adding the high-concentration liquor wastewater into the second pretreatment system, performing coagulation treatment on the high-concentration liquor wastewater, and performing solid-liquid separation to obtain a carbon source concentrate and a carbon source supernatant;

[0027] Passing the carbon source concentrate into the anaerobic reactor to be recycled as a carbon source; and / or

[0028] The carbon source supernatant is introduced into the biological denitrification and phosphorus removal pool of the biochemical system to be recycled as a carbon source.

[0029] The wastewater treatment system includes a first pretreatment system, an anaerobic treatment system, a biochemical system, and an advanced treatment system, all connected in sequence. This water treatment system can effectively reduce the chemical oxygen demand (COD) of liquor wastewater and meet discharge requirements. Furthermore, the anaerobic treatment system includes an anaerobic reactor and an anaerobic sedimentation tank, each connected in sequence. The anaerobic reactor is connected to the anaerobic sedimentation tank via a first outlet and a second inlet, respectively, allowing the precipitate after the anaerobic reaction to return to the anaerobic reactor, thereby enabling the anaerobic treatment system to reuse the organic matter and microorganisms in the precipitate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0031] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0032] Figure 1 Schematic diagram of a wastewater treatment system in one embodiment of the present application.

[0033] Description of reference numerals:

[0034] 101. First pretreatment system; 102. Second pretreatment system; 200. Anaerobic treatment system; 300. Biochemical system; 400. Deep treatment system; 500. Auxiliary treatment system; 601. First power generation system; 602. Second power generation system. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] Liquor wastewater is a high-concentration organic wastewater, which contains a large amount of complex organic matter such as starch, sugar, protein, etc. Direct discharge will lead to serious environmental problems such as eutrophication of water bodies and microbial toxic pollution.

[0044] When traditional wastewater treatment systems treat liquor wastewater, a large amount of organic matter is not properly utilized and is treated as pollutants, resulting in low economic benefits for the wastewater treatment system.

[0045] Based on this, the first aspect of this application provides a wastewater treatment system that can recycle organic matter and microorganisms in white wine wastewater.

[0046] For example, see Figure 1 , Figure 1 Schematic diagram of a wastewater treatment system in one embodiment of the present application.

[0047] The wastewater treatment system includes a first pretreatment system 101, an anaerobic treatment system 200, a biochemical system 300, and an advanced treatment system 400, which are connected in sequence. During use, liquor wastewater flows from the first pretreatment system 101 into the wastewater treatment system. After being treated in these systems, the first pretreatment system 101, the anaerobic treatment system 200, the biochemical system 300, and the advanced treatment system 400, it exits the wastewater treatment system from the advanced treatment system 400. The first pretreatment system 101 initially separates impurities from the liquor wastewater through coarse filtration and coagulation. The anaerobic treatment system 200 uses microorganisms to decompose organic matter, thereby reducing the chemical oxygen demand (COD) of the liquor wastewater. The biochemical system 300 removes nitrogen and phosphorus from the liquor wastewater through biochemical reactions, further reducing its COD. The advanced treatment system 400 oxidizes organic matter in the liquor wastewater and deeply filters impurities. After treatment in the advanced treatment system 400, the liquor wastewater can be discharged into the environment.

[0048] Anaerobic treatment system 200 includes an anaerobic reactor and an anaerobic sedimentation tank, which are sequentially connected. The anaerobic reactor includes a first water inlet, a first water outlet, and a second water inlet. The first water inlet is used to receive the liquor wastewater treated by the first pretreatment system 101. The first water outlet is connected to the anaerobic sedimentation tank. The second water inlet is connected to the anaerobic sedimentation tank to allow the sediment to flow back to the anaerobic reactor. The anaerobic sedimentation tank includes a first mud discharge port and a second water outlet. The first mud discharge port is connected to the second water inlet, and the second water outlet is connected to the biochemical system 300.

[0049] The wastewater treatment system includes a first pretreatment system 101, an anaerobic treatment system 200, a biochemical system 300, and an advanced treatment system 400, all connected in sequence. This water treatment system can effectively reduce the chemical oxygen demand (COD) of liquor wastewater and meet discharge requirements. Furthermore, the anaerobic treatment system 200 includes an anaerobic reactor and an anaerobic sedimentation tank, each connected in sequence. The anaerobic reactor is connected to the anaerobic sedimentation tank via a first outlet and a second inlet, respectively, allowing the precipitate after the anaerobic reaction to return to the anaerobic reactor, thereby enabling the anaerobic treatment system 200 to reuse the organic matter and microorganisms in the precipitate.

[0050] In some embodiments, the anaerobic treatment system 200 also includes an intermediate tank, which is connected to the first pretreatment system 101 and the first water inlet of the anaerobic reactor, respectively. The intermediate tank is used to buffer and regulate the water quality and water volume of the liquor wastewater flowing into the first pretreatment system 101, so that the water quality of the liquor wastewater entering the anaerobic reactor remains relatively stable.

[0051] In some embodiments, the anaerobic sedimentation tank includes an anaerobic sedimentation tank water inlet and an anaerobic sedimentation tank water outlet, the anaerobic sedimentation tank water inlet is connected to the first water outlet, and the anaerobic sedimentation tank water outlet is connected to the biochemical system 300 .

[0052] In some embodiments, the anaerobic reactor further includes a gas outlet for discharging biogas.

[0053] In some embodiments, the anaerobic reactor comprises an ESGB-type anaerobic reactor.

[0054] In some embodiments, the first pretreatment system 101 includes a first water collection tank and a first coagulation tank. The first water collection tank is connected to the first coagulation tank with a filter grating therebetween. The filter grating is used to initially filter the liquor wastewater flowing from the first water collection tank to the first coagulation tank. The first coagulation tank is used to coagulate the liquor wastewater. The first coagulation tank is connected to the intermediate tank to allow the supernatant of the coagulated and precipitated liquor wastewater to flow into the intermediate tank.

[0055] In some embodiments, the first coagulation tank includes a coagulation tank inlet and a coagulation tank outlet, and the first water collection tank includes a first water collection tank outlet and a first water collection tank inlet. The coagulation tank inlet is connected to the first water collection tank outlet, with a filter screen disposed therebetween. The coagulation tank outlet is connected to the anaerobic treatment system 200, and the coagulation tank outlet is used to allow the supernatant of the coagulated and settled liquor wastewater to flow to the anaerobic treatment system 200.

[0056] In some embodiments, the filter grid has a bar spacing of 1 mm to 2 mm. Using a filter grid of such size can remove larger solid residues in the liquor wastewater and prevent larger impurities from entering subsequent treatment equipment and causing blockage.

[0057] In some embodiments, the first coagulation tank has a coagulant adding device, which adds coagulant to cause the fine suspended particles and colloidal substances in the liquor wastewater to coagulate and flocculate to form larger flocs, which settle to the bottom of the first coagulation tank under the action of gravity, thereby removing most of the suspended solids and a small part of organic matter in the liquor wastewater and reducing the load on the subsequent treatment system.

[0058] In some embodiments, the wastewater treatment system also includes a first power generation system 601. The first power generation system 601 includes a sludge thickening tank, a dehydrator, a drying machine, and an incineration power generation device connected in sequence; the sludge thickening tank is connected to the second mud outlet of the first coagulation tank to collect the sludge coagulated and precipitated from the liquor wastewater and use it for power generation. Among them, the sludge thickening tank is used for preliminary solid-liquid separation, the dehydrator and the drying machine are used to further reduce the moisture content in the sludge so that the sludge is dried to a level that can be incinerated, and the incineration power generation device is used to incinerate the dried material to generate electricity. The electricity generated by the first power generation system 601 can be reused in other links of the wastewater treatment system, thereby realizing the recycling and utilization of organic resources in the liquor wastewater.

[0059] In some embodiments, the anaerobic sedimentation tank includes a third sludge outlet, which is connected to the sludge thickening tank to recover sludge and use it for incineration to generate electricity.

[0060] In some embodiments, the wastewater treatment system further includes a second power generation system 602 , which is connected to the gas outlet of the anaerobic reactor to collect biogas and use it to generate electricity.

[0061] In some embodiments, the first power generation system 601 includes a water seal tank, a dehydration tank, a desulfurization tank, a gas storage tank, and a combustion power generation device, which are connected in sequence; the water seal tank is connected to the outlet of the anaerobic reactor to collect biogas. The water seal tank is used to stabilize the pressure to improve the safety of the system. The dehydration tank and desulfurization tank are used to remove water and impurities from the biogas to improve its quality. The gas storage tank is used to store purified biogas. The combustion power generation device is used to burn biogas to generate electricity. The electricity generated by the second power generation system 602 can be recycled to other parts of the wastewater treatment system, thereby achieving the recycling of organic resources in the liquor wastewater.

[0062] In some embodiments, the biochemical system 300 includes a biological denitrification and phosphorus removal tank and a MABR-MBR coupling system connected to each other. The biological denitrification and phosphorus removal tank is connected to the anaerobic treatment system 200, and the MABR-MBR coupling system is connected to the deep treatment system 400.

[0063] In some embodiments, the MABR-MBR coupling system includes a fourth sludge outlet, which is connected to the sludge thickening tank to recover sludge and use it for incineration to generate electricity.

[0064] In some embodiments, the biological denitrification and phosphorus removal tank comprises an anaerobic-anoxic-aerobic process reactor (A2O), which comprises an anaerobic, anoxic, and aerobic tank connected in sequence. The anaerobic tank is connected to an anaerobic sedimentation tank, which in turn is connected to a MABR-MBR coupling system. In the anaerobic section, phosphorus-accumulating bacteria release phosphorus; in the anoxic section, denitrifying bacteria perform denitrification; and in the aerobic section, nitrifying bacteria carry out nitrification while the phosphorus-accumulating bacteria absorb excess phosphorus. By alternating between anaerobic, anoxic, and aerobic environments, efficient removal of nutrients such as nitrogen and phosphorus can be achieved from liquor wastewater.

[0065] In the traditional A2O process, a secondary sedimentation tank, which takes up a lot of space, needs to be connected after the aerobic tank, resulting in high costs and large space for the wastewater treatment system. In this application, by replacing the secondary sedimentation tank with a MABR-MBR coupling system, the space utilization efficiency of the wastewater treatment system is effectively improved. Research and testing have found that the MABR-MBR coupling process can effectively remove organic matter when treating liquor wastewater, further improving the treatment effect of liquor wastewater compared to the traditional A2O process.

[0066] The wastewater treatment system requires multiple treatments to handle the high concentrations of organic matter in liquor wastewater. Due to different treatment stages, the wastewater's residence time in each treatment system varies. The applicant discovered that during the peak liquor brewing season, wastewater discharge increases significantly. The anaerobic-anoxic-aerobic process reactors experience a decrease in treatment efficiency due to high load operation, impacting the operation of subsequent treatment systems.

[0067] In some embodiments, the wastewater treatment system also includes an auxiliary treatment system 500. The auxiliary treatment system 500 includes a digestate storage tank and a regulating tank that are interconnected. The digestate storage tank is connected to the second water outlet of the anaerobic reactor so that the digestate produced by the anaerobic reaction flows into the auxiliary treatment system 500. The regulating tank is used to adjust the pH of the digestate, adsorb and filter heavy metal impurities, and the regulated digestate can be used to irrigate crops after meeting the standards. Optionally, the regulating tank can also be used to dynamically adjust the nitrogen, phosphorus and potassium content in the digestate. According to the nutrient requirements of different crops, ammonium sulfate is added in proportion to supplement the nitrogen source, potassium dihydrogen phosphate is added to supplement the phosphorus source, and potassium sulfate is added to supplement the potassium source, so that the nutrients of the regulated digestate are balanced and more suitable for crops. By adding more, not only can the wastewater treatment system be further adapted to a larger amount of liquor wastewater treatment, but also the full utilization of organic matter in the digestate can be achieved.

[0068] In the various processes of liquor production, the COD of the wastewater accumulated at the bottom of the cellar during the fermentation process is usually higher than the COD of the wastewater from other processes, and purification is difficult. In order to specifically solve the high-concentration liquor wastewater generated by the fermentation process, in some embodiments, the wastewater treatment system also includes a second pretreatment system 102 for treating high-concentration liquor wastewater. The pretreatment system includes a second water collection tank, a second coagulation tank, and a carbon collection tank connected in sequence. The carbon collection tank is connected to the biological denitrification and phosphorus removal tank and the anaerobic reactor to provide a carbon source. The second water collection tank is used to store high-concentration liquor wastewater. By adding the second pretreatment system 102, the organic matter in the high-concentration liquor wastewater can be effectively utilized and the carbon source cost can be reduced.

[0069] In some embodiments, the deep treatment system 400 includes an ozone advanced oxidizer and a biological aeration filter (BAF), connected in sequence. The ozone advanced oxidizer is connected to the biochemical system 300, and the liquor wastewater is discharged from the wastewater treatment system after being treated in the biological aeration filter. The ozone advanced oxidizer utilizes the strong oxidizing properties of ozone to oxidize and decompose non-biodegradable organic matter in the liquor wastewater, thereby improving the biodegradability of the wastewater. The biological aeration filter is used to further remove organic matter, ammonia nitrogen, and other pollutants from the wastewater under aerobic conditions through a surface biofilm, providing deep purification. After this series of deep treatments, the COD content of the liquor wastewater meets emission standards.

[0070] In some embodiments, the deep treatment system 400 further includes an ultraviolet disinfection device, which is disposed in the outlet pipe of the biological aeration filter to perform ultraviolet sterilization on the treated water to be discharged to the environment.

[0071] In a second aspect, the present application provides a method for treating wastewater from liquor production.

[0072] The method for treating liquor production wastewater adopts the above-mentioned wastewater treatment system and includes the following steps:

[0073] Adding liquor wastewater into the first pretreatment system 101, performing coagulation treatment on the liquor wastewater, and performing solid-liquid separation to obtain a first precipitate and a first treated liquid;

[0074] Passing the first treated liquid into an anaerobic reactor to obtain a digestate through anaerobic reaction, passing the digestate into an anaerobic sedimentation tank through a first water outlet, performing solid-liquid-gas separation to obtain a biogas mixture, a second precipitate, and a supernatant, and returning the second precipitate to the anaerobic reactor through a first mud discharge outlet;

[0075] The supernatant is introduced into the biochemical system 300 through the second water outlet, and the supernatant is subjected to biological denitrification and dephosphorization treatment, and solid-liquid separation is performed to obtain a third precipitate and a second treated liquid;

[0076] The second treated liquid is passed into the deep treatment system 400, and the liquor wastewater treated liquid is oxidized and filtered to obtain dischargeable treated water.

[0077] In some embodiments, one or more of the first precipitate, the second precipitate, and the third precipitate are introduced into the first power generation system 601 for incineration power generation.

[0078] In some embodiments, the biogas mixture is introduced into the second power generation system 602 for biogas power generation.

[0079] In some embodiments, wastewater obtained from different liquor production processes is divided into liquor wastewater and high-concentration liquor wastewater according to a set chemical oxygen demand, and the chemical oxygen demand of the high-concentration liquor wastewater is higher than the chemical oxygen demand of the liquor wastewater;

[0080] High-concentration liquor wastewater is added to the second pretreatment system 102, and the high-concentration liquor wastewater is subjected to coagulation treatment, and solid-liquid separation is performed to obtain a carbon source concentrate and a carbon source supernatant;

[0081] The carbon source concentrate is passed into an anaerobic reactor to be recycled as a carbon source.

[0082] In some embodiments, the carbon source supernatant is passed into the biological denitrification and phosphorus removal tank of the biochemical system 300 to be recycled as a carbon source.

[0083] In some embodiments, the high-concentration liquor wastewater is pit bottom wastewater. It is understood that pit bottom wastewater is wastewater accumulated at the bottom of the pit during the liquor fermentation process, and its chemical oxygen demand is generally higher than the chemical oxygen demand of wastewater generated in other liquor production processes.

[0084] In some embodiments, the treated liquor wastewater meets the special emission limits for water pollutants specified in GB 27631-2011.

[0085] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A wastewater treatment system, characterized in that: The system comprises a first pretreatment system, an anaerobic treatment system, a biochemical system and a deep treatment system connected in sequence, wherein liquor wastewater flows into the first pretreatment system and is sequentially treated by the first pretreatment system, the anaerobic treatment system, the biochemical system and the deep treatment system before being discharged from the deep treatment system; the first pretreatment system is used for coarse filtration of liquor wastewater, the anaerobic treatment system is used for purifying liquor wastewater through a microbial anaerobic process, the biochemical system is used for purifying liquor wastewater through a biological denitrification and phosphorus removal process, and the deep treatment system is used for purifying liquor wastewater through an oxidation process; The anaerobic treatment system includes an anaerobic reactor and an anaerobic sedimentation tank connected in sequence; the anaerobic reactor includes a first water inlet, a first water outlet and a second water inlet, the first water inlet is used to receive the white wine wastewater treated by the first pretreatment system, the first water outlet is connected to the anaerobic sedimentation tank, and the second water inlet is connected to the anaerobic sedimentation tank to allow the sediment to flow back to the anaerobic reactor; the anaerobic sedimentation tank includes a first mud discharge port and a second water outlet, the first mud discharge port is connected to the second water inlet, and the second water outlet is connected to the biochemical system.

2. The wastewater treatment system according to claim 1, characterized in that The first pretreatment system includes a first water collection tank and a first coagulation tank, and the anaerobic treatment system also includes an intermediate tank; The first water collection tank is connected to the first coagulation tank with a filter grating therebetween, and the filter grating is used for preliminarily filtering the liquor wastewater flowing from the first water collection tank to the first coagulation tank; The first coagulation tank is used to coagulate the liquor wastewater. The first coagulation tank is connected to the intermediate tank so that the supernatant of the coagulated and precipitated liquor wastewater flows into the intermediate tank; the intermediate tank is connected to the first water inlet of the anaerobic reactor.

3. The wastewater treatment system according to claim 2, characterized in that The wastewater treatment system also includes a first power generation system, which includes a sludge thickening tank, a dehydrator, a dryer and an incineration power generation device connected in sequence; the sludge thickening tank is connected to the second mud discharge port of the first coagulation tank to collect the sludge coagulated and precipitated by the liquor wastewater and use it for power generation.

4. The wastewater treatment system according to claim 1, characterized in that The biochemical system includes a biological denitrification and phosphorus removal tank and a MABR-MBR coupling system connected to each other; the biological denitrification and phosphorus removal tank is connected to the anaerobic treatment system, and the MABR-MBR coupling system is connected to the deep treatment system.

5. The wastewater treatment system according to claim 4, characterized in that: The wastewater treatment system also includes a second pretreatment system for treating high-concentration liquor wastewater. The pretreatment system includes a second water collection tank, a second coagulation tank and a carbon collection tank connected in sequence. The carbon collection tank is connected to the biological denitrification and phosphorus removal tank and the anaerobic reactor to provide a carbon source. The second water collection tank is used to store high-concentration liquor wastewater.

6. The wastewater treatment system according to claim 1, characterized in that: The deep treatment system includes an ozone advanced oxidizer and an aerated biological filter connected in sequence; the ozone advanced oxidizer is connected to the biochemical system, and the liquor wastewater is discharged from the wastewater treatment system after being treated in the aerated biological filter.

7. The wastewater treatment system according to any one of claims 1 to 6, characterized in that: The wastewater treatment system further comprises a second power generation system, which comprises a water seal tank, a dehydration tank, a desulfurization tank, a gas storage tank and a combustion power generation device connected in sequence, wherein the water seal tank is connected to the gas outlet of the anaerobic reactor to collect biogas and use it for power generation; and / or The wastewater treatment system also includes an auxiliary treatment system; the auxiliary treatment system includes a digestate storage tank and a regulating tank that are interconnected. The digestate storage tank is connected to the second water outlet of the anaerobic reactor so that the digestate generated by the anaerobic reaction flows into the auxiliary treatment system. The regulating tank is used to adjust the pH of the digestate, filter heavy metal impurities and adjust the organic matter content.

8. A method for treating liquor production wastewater, characterized in that: The wastewater treatment system according to any one of claims 1 to 7 comprises the following steps: Adding liquor wastewater into the first pretreatment system, performing coagulation treatment on the liquor wastewater, and performing solid-liquid separation to obtain a first precipitate and a first treated liquid; Passing the first treated liquid into an anaerobic reactor to obtain a digestate through anaerobic reaction, passing the digestate into an anaerobic sedimentation tank through a first water outlet, separating solid, liquid and gas to obtain a biogas mixture, a second precipitate and a supernatant, and returning the second precipitate to the anaerobic reactor through a first mud discharge outlet; The supernatant is introduced into a biochemical system through a second water outlet, the supernatant is subjected to biological denitrification and dephosphorization treatment, and solid-liquid separation is performed to obtain a third precipitate and a second treated liquid; The second treated liquid is passed into a deep treatment system, and the liquor wastewater treated liquid is oxidized and filtered to obtain dischargeable treated water.

9. The method for treating liquor production wastewater according to claim 8, characterized in that: passing one or more of the first precipitate, the second precipitate and the third precipitate into a first power generation system for incineration power generation; and / or The biogas mixture is introduced into a second power generation system for biogas power generation.

10. The method for treating liquor production wastewater according to claim 8 or 9, characterized in that: The wastewater obtained from different liquor production processes is divided into liquor wastewater and high-concentration liquor wastewater according to a set chemical oxygen demand, wherein the chemical oxygen demand of the high-concentration liquor wastewater is higher than the chemical oxygen demand of the liquor wastewater; adding the high-concentration liquor wastewater into the second pretreatment system, performing coagulation treatment on the high-concentration liquor wastewater, and performing solid-liquid separation to obtain a carbon source concentrate and a carbon source supernatant; passing the carbon source concentrate into the anaerobic reactor to be recycled as a carbon source; and / or The carbon source supernatant is introduced into the biological denitrification and phosphorus removal pool of the biochemical system to be recycled as a carbon source.

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