Maotai-flavor liquor wastewater treatment system and treatment method

Abstract

The present application relates to a system and method for treating wastewater from Maotai-flavor liquor, the system comprising: a pretreatment unit, which comprises a filtration unit and a regulating unit; an anaerobic treatment unit, which comprises a first anaerobic unit and a second anaerobic unit; a chemical treatment unit, which comprises a chemical denitrification and phosphorus removal unit and a chemical precipitation unit; a biochemical treatment unit; a deep treatment unit, which comprises an ozone oxidation unit and a final sedimentation unit; wherein a first bypass pipe is provided between the regulating unit and the chemical denitrification and phosphorus removal unit, and a second bypass pipe is provided between the first anaerobic unit and the chemical denitrification and phosphorus removal unit, and the first bypass pipe and the second bypass pipe are configured to control their openings according to the water quality index of the Maotai-flavor liquor wastewater. The present application can achieve the COD reduction of the chemical treatment water produced by the chemical treatment unit in a coarse adjustment and fine adjustment manner. Cr Precise adjustment of the / TN value avoids treatment that fails to meet emission standards or wastes costs.

Description

Technical Field

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

[0002] Maotai-flavor liquor brewing industrial wastewater is wastewater generated during the brewing process of Maotai-flavor liquor, mainly including mixed wastewater such as pot bottom water, pit bottom water, cooling water, and flushing water, with large water volume and high concentrations of pollutants such as COD, nitrogen, and phosphorus. Based on this, the wastewater needs to be properly treated to avoid pollution to the ecological environment. In the prior art, there is a treatment system for treating Maotai-flavor liquor wastewater, and the treatment system may include a pretreatment unit, an anaerobic treatment unit, a biochemical treatment unit, and a deep treatment unit for pretreatment, anaerobic treatment, biochemical treatment, and deep treatment of the wastewater in sequence, and through the aforementioned multiple treatment processes, the treatment effect of Maotai-flavor liquor wastewater can be guaranteed, and at the same time, the risk of increased environmental pollution due to factors such as large amounts of added agents and unstable system operation can be avoided. However, during the brewing cycle of Maotai-flavor liquor, as the number of wine extraction rounds increases, the water quality indicators of the wastewater generated by wine extraction change during the brewing cycle, especially the concentration of organic pollutants increases with the increase in the number of wine extraction rounds; while the various units of the Maotai-flavor liquor wastewater treatment system in the prior art have relatively simple wastewater treatment methods and relatively fixed treatment capacities, which are difficult to adapt to the treatment needs of wastewater with changing water quality indicators, and it is easy for the wastewater treatment effect of some wine extraction rounds to be poor and fail to meet the emission standards, or the wastewater treatment effect of some wine extraction rounds to be excessive, resulting in a waste of costs. Summary of the invention

[0003] Based on this, the present application provides a Maotai-flavor liquor wastewater treatment system and treatment method to improve the problem that the Maotai-flavor liquor wastewater treatment system in the prior art is difficult to adapt to the treatment needs of wastewater with changing water quality indicators.

[0004] In a first aspect, the present application provides a Maotai-flavor liquor wastewater treatment system, wherein the Maotai-flavor liquor wastewater treatment system is used to treat Maotai-flavor liquor wastewater, and the Maotai-flavor liquor wastewater treatment system comprises:

[0005] A pretreatment unit, comprising a filtering unit and a regulating unit, wherein the Maotai-flavor liquor wastewater passes through the filtering unit and the regulating unit in sequence, wherein the filtering unit filters the Maotai-flavor liquor wastewater, and the regulating unit causes the filtered Maotai-flavor liquor wastewater to undergo a hydrolysis and acidification reaction to obtain pretreatment product water;

[0006] The anaerobic treatment unit comprises a first anaerobic unit and a second anaerobic unit, wherein the pretreated produced water passes through the first anaerobic unit and the second anaerobic unit in sequence, wherein the first anaerobic unit causes the pretreated produced water to undergo an anaerobic hydrogen-methane production reaction, and the second anaerobic unit causes the supernatant of the pretreated produced water after the hydrogen-methane production reaction to undergo an anaerobic hydrolysis and acidification reaction to obtain anaerobic treated produced water;

[0007] A chemical treatment unit, comprising a chemical denitrification and phosphorus removal unit and a chemical precipitation unit, wherein the anaerobic treatment produced water sequentially passes through the chemical denitrification and phosphorus removal unit and the chemical precipitation unit, wherein the chemical denitrification and phosphorus removal unit adds divalent magnesium ions to the anaerobic treatment produced water, and the chemical precipitation unit continues to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after the addition of divalent magnesium ions for coagulation and precipitation, so as to obtain chemical treatment produced water;

[0008] A biochemical treatment unit, wherein the chemically treated water passes through the biochemical treatment unit, and the biochemical treatment unit performs biochemical denitrification and dephosphorization treatment on the chemically treated water to obtain biochemically treated water;

[0009] A deep treatment unit, comprising an ozone oxidation unit and a final sedimentation unit, wherein the biochemical treatment produced water passes through the ozone oxidation unit and the final sedimentation unit in sequence, wherein the ozone oxidation unit performs ozone oxidation treatment on the biochemical treatment produced water, and wherein the final sedimentation unit adds polyaluminium chloride and polyacrylamide to the biochemical treatment produced water after the ozone oxidation treatment for coagulation and sedimentation to obtain discharged water;

[0010] Among them, a first bypass pipe is arranged between the regulating unit and the chemical denitrification and phosphorus removal unit, and a second bypass pipe is arranged between the first anaerobic unit and the chemical denitrification and phosphorus removal unit. The first bypass pipe and the second bypass pipe are configured to control their openings according to the water quality index of the sauce-flavor liquor wastewater.

[0011] In one embodiment, the Maotai-flavor liquor wastewater treatment system also includes a membrane bioreactor unit. The Maotai-flavor liquor wastewater passes through the membrane bioreactor unit after passing through the biochemical treatment unit and before passing through the ozone oxidation unit. A third bypass pipe is arranged between the biochemical treatment unit and the ozone oxidation unit. The third bypass pipe is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater or the biochemical treatment water.

[0012] In one embodiment, the deep treatment unit also includes an activated carbon filtration unit. The biochemical treatment water also passes through the activated carbon filtration unit after passing through the ozone oxidation unit and before passing through the final sedimentation unit. A fourth bypass pipe is arranged between the ozone oxidation unit and the final sedimentation unit. The fourth bypass pipe is configured to control its opening according to the water quality index of the sauce-flavor liquor wastewater.

[0013] In one embodiment, the biochemical treatment unit includes a five-stage treatment unit and a reflux pump, the five-stage treatment unit includes an anaerobic unit, a primary anoxic unit, a primary aerobic unit, a secondary anoxic unit and a secondary aerobic unit in sequence, the reflux pump is connected between the five-stage treatment units and is used for reflux of nitrification liquid, the inlet of the reflux pump is the outlet position of the primary aerobic unit, the outlet of the reflux pump is the inlet position of the primary anoxic unit and the anaerobic unit, and the reflux pump is configured to control its opening according to the water quality index of the sauce-flavor liquor wastewater.

[0014] In one embodiment, the regulating unit is a regulating tank, and anaerobic sludge and a sludge stirring device for stirring the anaerobic sludge are arranged in the regulating unit.

[0015] In one embodiment, the chemical denitrification and phosphorus removal unit is a reaction tank, the divalent magnesium ions are added into the chemical denitrification and phosphorus removal unit through a dosing device, and a chemical stirring device is provided in the chemical denitrification and phosphorus removal unit, and the chemical stirring device is used to stir the anaerobic treatment water produced after the divalent magnesium ions are added.

[0016] In one embodiment, the chemical precipitation unit is a precipitation tank, and the polyaluminium chloride and the polyacrylamide are added into the chemical precipitation unit through the dosing device.

[0017] In one of the embodiments, a biochemical precipitation unit is disposed at the outlet of the biochemical treatment unit, and the biochemical precipitation unit is provided with a sludge return pipe, and the outlet of the sludge return pipe is disposed at the inlet of the biochemical treatment unit.

[0018] In one embodiment, the first anaerobic unit is an anaerobic baffle reactor, the second anaerobic unit is an upflow anaerobic sludge blanket reactor, the first anaerobic unit and the second anaerobic unit are connected in series, and an anaerobic sedimentation tank is provided between the first anaerobic unit and the second anaerobic unit.

[0019] In a second aspect, the present application provides a method for treating Maotai-flavor liquor wastewater, the method comprising:

[0020] Obtain water quality indicators of Maotai-flavor liquor wastewater;

[0021] Filtering the Maotai-flavor liquor wastewater, and subjecting the filtered Maotai-flavor liquor wastewater to a hydrolysis and acidification reaction to obtain pre-treated product water;

[0022] The pretreated produced water is subjected to an anaerobic hydrogen-methane production reaction, and the supernatant of the pretreated produced water after the hydrogen-methane production reaction is subjected to an anaerobic hydrolysis acidification reaction to obtain anaerobic treated produced water, wherein part of the pretreated produced water is directly supplied to the outlet position of the anaerobic treated produced water, or part of the pretreated produced water after the hydrogen-methane production reaction is directly supplied to the outlet position of the anaerobic treated produced water, and the flow rate of the part of the pretreated produced water directly supplied to the outlet position of the anaerobic treated produced water or the pretreated produced water after the hydrogen-methane production reaction is determined by the water quality index of the Maotai-flavor liquor wastewater;

[0023] Adding divalent magnesium ions to the anaerobic treatment produced water, and continuing to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after adding the divalent magnesium ions for coagulation and precipitation to obtain chemically treated produced water;

[0024] Performing biochemical denitrification and phosphorus removal on the chemically treated produced water to obtain biochemically treated produced water;

[0025] The biochemical treatment produced water is subjected to ozone oxidation treatment, and polyaluminium chloride and polyacrylamide are added to the biochemical treatment produced water after the ozone oxidation treatment for coagulation and precipitation to obtain discharged water;

[0026] The water quality index of the discharged water is obtained, and it is determined whether the water quality index of the discharged water meets the discharge standard; if not, the discharged water is re-supplied to the inlet position of the pre-treated water product to serve as the Maotai-flavor liquor wastewater of the next treatment process, and in the next treatment process, the flow rate of the pre-treated water product directly supplied to the outlet position of the anaerobic treatment water product is adjusted, or the flow rate of the pre-treated water product after hydrogen and methane production reactions directly supplied to the outlet position of the anaerobic treatment water product is adjusted.

[0027] The present application reasonably sets the pretreatment unit as a filtration unit and a regulating unit before the chemical treatment unit and the biochemical treatment unit, and sets the anaerobic treatment unit as a first anaerobic unit and a second anaerobic unit; at the same time, a first bypass pipe is set between the regulating unit and the chemical treatment unit, and a second bypass pipe is set between the first anaerobic unit and the chemical treatment unit, and the openings of the first bypass pipe and the second bypass pipe are controlled according to the water quality index of the obtained Maotai-flavor liquor wastewater, so that the COD of the chemical treatment water produced by the chemical treatment unit can be adjusted by a coarse adjustment and a fine adjustment. Cr / TN value is precisely adjusted so that the water produced by chemical treatment can be well treated in the biochemical treatment unit, and further, during the entire brewing cycle of Maotai-flavor liquor, the treatment of Maotai-flavor liquor wastewater will not be poorly treated as the number of wine extraction rounds increases and the water quality indicators change, thus avoiding the situation where the treatment fails to meet the emission standards or causes cost waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of the Maotai-flavor liquor wastewater treatment system provided in Example 1 of the present application;

[0029] Figure 2 This is a flow chart of the method for treating Maotai-flavor liquor wastewater provided in Example 2 of the present application.

[0030] Figure numerals: 1. Filtration unit; 2. Adjustment unit; 3. First anaerobic unit; 4. Anaerobic sedimentation tank; 5. Second anaerobic unit; 6. Chemical denitrification and phosphorus removal unit; 7. Chemical precipitation unit; 8. Five-stage treatment unit; 9. Membrane bioreactor unit; 10. Ozone oxidation unit; 11. Activated carbon filtration unit; 12. Final sedimentation unit; 13. First bypass pipeline; 14. Second bypass pipeline; 15. Third bypass pipeline; 16. Fourth bypass pipeline; 17. Reflux pump. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0033] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] Embodiment 1

[0036] The first embodiment of the present application provides a Maotai-flavor liquor wastewater treatment system, which is used to treat Maotai-flavor liquor wastewater. The Maotai-flavor liquor wastewater treatment system includes:

[0037] The pretreatment unit comprises a filtering unit 1 and a regulating unit 2. The Maotai-flavor liquor wastewater passes through the filtering unit 1 and the regulating unit 2 in sequence. The filtering unit 1 filters the Maotai-flavor liquor wastewater. The regulating unit 2 causes the filtered Maotai-flavor liquor wastewater to undergo a hydrolysis and acidification reaction to obtain pretreated product water.

[0038] The anaerobic treatment unit includes a first anaerobic unit 3 and a second anaerobic unit 5. The pretreated produced water passes through the first anaerobic unit 3 and the second anaerobic unit 5 in sequence. The first anaerobic unit 3 allows the pretreated produced water to undergo an anaerobic hydrogen-methane production reaction. The second anaerobic unit 5 allows the supernatant of the pretreated produced water after the hydrogen-methane production reaction to undergo an anaerobic hydrolysis and acidification reaction to obtain anaerobic treated produced water.

[0039] The chemical treatment unit includes a chemical denitrification and phosphorus removal unit 6 and a chemical precipitation unit 7. The anaerobic treatment produced water passes through the chemical denitrification and phosphorus removal unit 6 and the chemical precipitation unit 7 in sequence. The chemical denitrification and phosphorus removal unit 6 adds divalent magnesium ions to the anaerobic treatment produced water. The chemical precipitation unit 7 continues to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after the addition of divalent magnesium ions for coagulation and precipitation to obtain chemical treatment produced water.

[0040] The biochemical treatment unit is used for the chemical treatment water, and the biochemical treatment unit is used for the biochemical denitrification and phosphorus removal of the chemical treatment water to obtain the biochemical treatment water;

[0041] A deep treatment unit, comprising an ozone oxidation unit 10 and a final settling unit 12, wherein the biochemically treated water passes through the ozone oxidation unit 10 and the final settling unit 12 in sequence, wherein the ozone oxidation unit 10 performs ozone oxidation treatment on the biochemically treated water, and the final settling unit 12 adds polyaluminium chloride and polyacrylamide to the biochemically treated water after the ozone oxidation treatment for coagulation and precipitation to obtain discharged water;

[0042] Among them, a first bypass pipe 13 is arranged between the regulating unit 2 and the chemical denitrification and phosphorus removal unit 6, and a second bypass pipe 14 is arranged between the first anaerobic unit 3 and the chemical denitrification and phosphorus removal unit 6. The first bypass pipe 13 and the second bypass pipe 14 are configured to control their openings according to the water quality indicators of the sauce-flavor liquor wastewater.

[0043] like Figure 1 As shown, in this embodiment, it is exemplified that after the Maotai-flavor liquor is taken, the Maotai-flavor liquor wastewater can be treated by the wastewater treatment system to make it reach the discharge standard. After the Maotai-flavor liquor wastewater enters the wastewater treatment system, it is pretreated to obtain pretreated water. In the pretreatment unit, the Maotai-flavor liquor wastewater is first filtered, and it passes through the filter unit 1. The filter unit 1 can be a filter screen and other devices. The filter unit 1 is mainly used to achieve solid-liquid separation of the Maotai-flavor liquor wastewater to preliminarily remove solid waste in the Maotai-flavor liquor wastewater. Subsequently, the filtered Maotai-flavor liquor wastewater is subjected to preliminary anaerobic fermentation, and the Maotai-flavor liquor wastewater passes through the regulating unit 2. In the regulating unit 2, the Maotai-flavor liquor wastewater undergoes a hydrolysis and acidification reaction, and the macromolecular organic matter in the Maotai-flavor liquor wastewater is partially decomposed. By regulating the hydrolysis and acidification of unit 2, a basis can be provided for the anaerobic reaction of the subsequent units, and the residence time of the total anaerobic reaction can be extended. Subsequently, the methanogenesis stage can be directly entered in the anaerobic treatment unit.

[0044] The pre-treated water needs to undergo further anaerobic fermentation treatment, and it passes through the first anaerobic unit 3 and the second anaerobic unit 5 in sequence. In the first anaerobic unit 3, the pre-treated water mainly undergoes hydrogen production and methane production reactions, and the organic matter in the pre-treated water is mineralized into carbon dioxide and water and removed. At the same time, the amino groups and phosphorus-containing groups in the organic matter are released to form free ammonium and phosphate ions. Subsequently, the pre-treated water after the hydrogen production and methane production reaction is precipitated, and its supernatant undergoes further anaerobic hydrolysis and acidification reaction in the second anaerobic unit 5 to more thoroughly mineralize the organic pollutants in the pre-treated water into carbon dioxide and water. At the same time, the amino groups and phosphorus-containing groups in the organic matter are more completely released to form free ammonium and phosphate ions, which are then convenient for subsequent treatment. After the pre-treated water passes through the anaerobic treatment unit, anaerobic treatment water is obtained.

[0045] like Figure 1As shown, the anaerobic treatment water product further enters the chemical treatment unit for chemical denitrification and phosphorus removal to obtain chemical treatment water product. Among them, the chemical treatment water product is added with divalent magnesium ions in the chemical denitrification and phosphorus removal unit 6, for example, magnesium chloride solution is added. In the chemical denitrification and phosphorus removal unit 6, the magnesium ions react with the ammonium ions and phosphate ions in the anaerobic treatment water product to form magnesium ammonium phosphate crystals to achieve the purpose of preliminary denitrification and phosphorus removal. Subsequently, the chemical treatment water product added with divalent magnesium ions is further added with polyaluminum chloride (PAC) and polyacrylic amide (PAM) in the chemical precipitation unit 7. Polyaluminum chloride and polyacrylic amide can be added in the form of solution for coagulation and precipitation. After precipitation, the supernatant in the chemical precipitation unit 7 is the chemical treatment water product. By performing chemical denitrification and phosphorus removal in the chemical treatment unit, the load of denitrification and phosphorus removal in the subsequent units can be reduced, and the purpose of reducing operating costs can be achieved.

[0046] The chemically treated water then passes through the biochemical treatment unit, which further removes nitrogen and phosphorus from the chemically treated water to obtain biochemically treated water. In the biochemical treatment unit, the pretreated water containing organic matter or the pretreated water after hydrogen and methane production can be added to the chemical treatment unit to use the carbon of the organic matter in the original Maotai-flavor liquor wastewater as the carbon source required for the denitrification reaction in the biochemical treatment unit, thereby ensuring the treatment effect of the biochemical treatment unit. Specifically, the pretreated water can enter the chemical treatment unit through the first bypass pipeline 13 set between the regulating unit 2 and the chemical denitrification and phosphorus removal unit 6; the pretreated water after hydrogen and methane production can enter the chemical treatment unit through the second bypass pipeline 14 set between the first anaerobic unit 3 and the chemical denitrification and phosphorus removal unit 6. In the chemical treatment unit, the pretreated water containing organic matter or the pretreated water after hydrogen and methane production can also be first precipitated with anaerobic sludge in the chemical precipitation unit 7, and then enter the biochemical treatment unit.

[0047] like Figure 1 As shown, the biochemical treatment water then passes through a deep treatment unit for further treatment. In the deep treatment unit, the biochemical treatment water first passes through an ozone oxidation unit 10, which performs ozone oxidation treatment on the biochemical treatment water to reduce the COD in the water. Cr The concentration is further reduced. The biochemical treatment water produced after the ozone oxidation treatment then passes through the final sedimentation unit 12, in which polyaluminum chloride and polyacrylamide are continuously added to the biochemical treatment water produced after the ozone oxidation treatment to coagulate and precipitate the residual phosphorus element and fine particles. After precipitation, the supernatant in the final sedimentation unit 12 is the discharged water.

[0048] like Figure 1 and Figure 2 As shown in the figure, when the Maotai-flavor liquor wastewater needs to be treated, the water quality indicators of the Maotai-flavor liquor wastewater are first obtained, and the water quality indicators include but are not limited to COD Cr Concentration, ammonia nitrogen concentration, total nitrogen concentration (TN) and total phosphorus concentration (TP). Subsequently, the Maotai-flavor liquor wastewater is supplied to the treatment system to treat the Maotai-flavor liquor wastewater. Among them, when the Maotai-flavor liquor wastewater passes through the pretreatment unit and obtains pretreated water, the opening of the first bypass pipe 13 can be controlled according to the water quality index of the Maotai-flavor liquor wastewater obtained, so as to directly supply part of the pretreated water to the chemical treatment unit. And when the pretreated water passes through the first anaerobic unit 3 for hydrogen and methane production reaction, the opening of the second bypass pipe 14 can also be controlled according to the water quality index of the Maotai-flavor liquor wastewater obtained, so as to directly supply part of the pretreated water after hydrogen and methane production reaction to the chemical treatment unit.

[0049] In detail, during the brewing cycle of Maotai-flavor liquor, the organic matter concentration of Maotai-flavor liquor wastewater generated from the first to fourth rounds of liquor extraction is relatively low. At this time, the flow rate of pretreated water produced by the chemical treatment unit or the pretreated water produced after hydrogen and methane production reactions should be relatively large, that is, the opening of the first bypass pipe 13 or the second bypass pipe 14 is larger to obtain a larger flow rate; for example, when the water inflow of Maotai-flavor liquor wastewater is 3500-4500m 3 / day, and the water quality indicators are as follows: COD Cr When the concentration is 1400mg / L, the ammonia nitrogen concentration is 25mg / L, the total nitrogen concentration is 30mg / L, and the total phosphorus concentration is 10mg / L, the flow rate of the pre-treated water entering the first bypass pipe 13 can be 30-40% of the total pre-treated water output. In the Maotai-flavor liquor wastewater produced from the fifth to seventh rounds of wine extraction, the concentration of organic matter is relatively high. At this time, the flow rate of the pre-treated water directly supplied to the chemical treatment unit or the pre-treated water after hydrogen and methane production reactions should be relatively small; for example, when the inflow of Maotai-flavor liquor wastewater is 4000-5000m 3 / day, and the water quality indicators are as follows: COD Cr When the concentration is 5500mg / L, the ammonia nitrogen concentration is 131mg / L, the total nitrogen concentration is 157mg / L, and the total phosphorus concentration is 67mg / L, the flow rate of the pretreated water entering the first bypass pipe 13 can be 20-30% of the total output of the pretreated water. By reasonably controlling the flow rate of the pretreated water directly supplied to the chemical treatment unit or the pretreated water after the hydrogen and methane production reactions, the COD of the chemical treatment water can be guaranteed. CrThe value of / TN is within a suitable range, for example, within a range of 6-15, to create a suitable biochemical treatment environment, thereby ensuring that the chemical treatment water can be well treated in the biochemical treatment unit. Cr The value of / TN can be obtained by actually measuring the water quality indicators of chemically treated water.

[0050] It is not difficult to understand that according to the water quality indicators of Maotai-flavor liquor wastewater, part of the pre-treated water is directly supplied to the chemical treatment unit, which is equivalent to COD Cr / TN value is roughly adjusted; and according to the water quality index of Maotai-flavor liquor wastewater, part of the pre-treated water produced after hydrogen and methane production reactions is directly supplied to the chemical treatment unit, which is equivalent to COD Cr / TN value. When adjusting, the opening of the first transcending pipe 13 is mainly controlled, and the opening of the second transcending pipe 14 is supplemented. Through the coordination of coarse adjustment and fine adjustment, the COD of the chemical treatment water can be accurately adjusted. Cr The value of / TN is controlled to the value required for biochemical treatment.

[0051] When the Maotai-flavor liquor wastewater passes through a complete treatment system to obtain discharged water, the discharged water is tested for water quality indicators. Similarly, the water quality indicators of the discharged water include but are not limited to COD Cr Concentration, ammonia nitrogen concentration, total nitrogen concentration (TN) and total phosphorus concentration (TP). Subsequently, it is determined whether the water quality index of the discharged water meets the discharge standard. If so, the discharged water can be discharged to the designated location. If not, the discharged water is introduced into the treatment system as the sauce-flavor liquor wastewater of the next treatment process, and the flow of the first transcending pipe 13 and the second transcending pipe 14 is reasonably controlled according to the measured water quality index.

[0052] In summary, the present application reasonably sets the pretreatment unit as the filtration unit 1 and the regulating unit 2 before the chemical treatment unit and the biochemical treatment unit, and sets the anaerobic treatment unit as the first anaerobic unit 3 and the second anaerobic unit 5; at the same time, a first bypass pipe 13 is set between the regulating unit 2 and the chemical treatment unit, and a second bypass pipe 14 is set between the first anaerobic unit 3 and the chemical treatment unit, and the openings of the first bypass pipe 13 and the second bypass pipe 14 are controlled according to the water quality index of the obtained Maotai-flavor liquor wastewater, so that the COD of the chemical treatment water produced by the chemical treatment unit can be adjusted in a manner coordinated with coarse adjustment and fine adjustment. Cr / TN value is precisely adjusted so that the water produced by chemical treatment can be well treated in the biochemical treatment unit, and further, during the entire brewing cycle of Maotai-flavor liquor, the treatment of Maotai-flavor liquor wastewater will not be poorly treated as the number of wine extraction rounds increases and the water quality indicators change, thus avoiding the situation where the treatment fails to meet the emission standards or causes cost waste.

[0053] Specifically, the Maotai-flavor liquor wastewater treatment system also includes a membrane bioreactor unit 9. After passing through the biochemical treatment unit and before passing through the ozone oxidation unit 10, the Maotai-flavor liquor wastewater also passes through the membrane bioreactor unit 9. A third bypass pipe 15 is arranged between the biochemical treatment unit and the ozone oxidation unit 10. The third bypass pipe 15 is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater or the biochemical treatment water.

[0054] like Figure 1 As shown, in this embodiment, it is exemplified that when the Maotai-flavor liquor wastewater passes through the biochemical treatment unit and obtains biochemical treatment water, the biochemical treatment water can first pass through the membrane bioreactor (MBR) unit 9, and the membrane bioreactor unit 9 can remove the tiny particles and colloidal substances in the biochemical treatment water to obtain membrane water; and the membrane water can further enter the ozone oxidation unit 10 for ozone oxidation treatment. Of course, the biochemical treatment water can also be directly supplied to the ozone oxidation unit 10 through the third bypass pipe 15, that is, the biochemical treatment water can be directly ozonated without removing the tiny particles and colloidal substances.

[0055] When obtaining the water quality index of Maotai-flavor liquor wastewater, its water quality index may also include the concentration of micro-particles and colloids. If the concentration of micro-particles and colloids in Maotai-flavor liquor wastewater does not reach the discharge standard, the opening of the third bypass pipe 15 is controlled to be 0, so that the water produced by the biochemical treatment passes through the membrane bioreactor unit 9 to remove micro-particles and colloids. If the concentration of micro-particles and colloids in Maotai-flavor liquor wastewater reaches the discharge standard, the membrane bioreactor unit 9 is closed, and the opening of the third bypass pipe 15 is controlled to be greater than 0, so that the water produced by the biochemical treatment does not need to pass through the membrane bioreactor unit 9.

[0056] Of course, when obtaining the water quality index of the biochemical treatment water, the concentration of its micro-particles and colloid substances can also be obtained. The opening of the third transcending pipe 15 can also be controlled according to the water quality index of the biochemical treatment water.

[0057] It can be understood that, by setting a membrane bioreactor unit 9 between the biochemical treatment unit and the ozone oxidation unit 10, this embodiment can further improve the treatment effect of the Maotai-flavor liquor wastewater treatment system by removing tiny particles and colloidal substances; and this embodiment also sets a third bypass pipe 15 across the membrane bioreactor unit 9, which can further improve the ability of the disposal system to adaptively treat the Maotai-flavor liquor wastewater according to the water quality indicators, thereby effectively avoiding the treatment failing to meet the emission standards or causing waste of costs.

[0058] More specifically, the deep treatment unit also includes an activated carbon filter unit 11. The biochemical treatment water passes through the activated carbon filter unit 11 after passing through the ozone oxidation unit 10 and before passing through the final sedimentation unit 12. A fourth bypass pipe 16 is arranged between the ozone oxidation unit 10 and the final sedimentation unit 12. The fourth bypass pipe 16 is configured to control its opening according to the water quality index of the sauce-flavor liquor wastewater.

[0059] like Figure 1 As shown, in this embodiment, the activated carbon filter unit 11 can be an activated carbon filter tank, and the activated carbon filter unit 11 can filter low-concentration organic matter and phosphorus and other pollutants from the biochemical treatment water after ozone oxidation treatment. The biochemical treatment water produced after the activated carbon filter unit 11 can enter the final sedimentation unit 12 for coagulation and sedimentation treatment. Of course, the biochemical treatment water produced after ozone oxidation treatment can also be directly supplied to the final sedimentation unit 12 through the fourth transcending pipeline 16, that is, the biochemical treatment water produced after ozone oxidation treatment can be directly coagulated and precipitated without filtering low-concentration organic matter and phosphorus and other pollutants. When the concentration of organic matter and phosphorus in the water quality index of the obtained Maotai-flavor liquor wastewater is high, the opening of the fourth transcending pipeline 16 can be controlled to 0, so that the biochemical treatment water produced after ozone oxidation treatment can be filtered through the activated carbon filter unit 11 to remove low-concentration organic matter and phosphorus and other pollutants. When the concentrations of organic matter and phosphorus in the water quality indicators of the obtained Maotai-flavor liquor wastewater are low, the opening of the fourth bypass pipe 16 is controlled to be greater than 0, and all the biochemical treatment water after ozone oxidation treatment is supplied to the final sedimentation unit 12 through the fourth bypass pipe 16.

[0060] It can be understood that, by setting an activated carbon filter unit 11 between the ozone oxidation unit 10 and the final sedimentation unit 12, this embodiment can further improve the treatment effect of the Maotai-flavor liquor wastewater treatment system by filtering out low-concentration organic matter and pollutants such as phosphorus; and this embodiment also sets a fourth bypass pipe 16 across the activated carbon filter unit 11, which can further improve the ability of the disposal system to perform adaptive treatment according to the water quality indicators of the Maotai-flavor liquor wastewater.

[0061] More specifically, the biochemical treatment unit includes a five-stage treatment unit 8 and a reflux pump 17. The five-stage treatment unit 8 includes an anaerobic unit, a primary anoxic unit, a primary aerobic unit, a secondary anoxic unit and a secondary aerobic unit in sequence. The reflux pump 17 is connected between the five-stage treatment units 8 and is used for reflux of the nitrification liquid. The inlet of the reflux pump 17 is the outlet position of the primary aerobic unit, and the outlet of the reflux pump 17 is the inlet position of the primary anoxic unit and the anaerobic unit. The reflux pump 17 is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater.

[0062] like Figure 1 As shown, in this embodiment, it is exemplarily explained that the five-stage treatment unit 8 can be a treatment pool arranged continuously, that is, the anaerobic unit, the first anoxic unit, the first aerobic unit, the second anoxic unit and the second aerobic unit are anaerobic pools, anoxic pools, aerobic pools, anoxic pools and aerobic pools arranged continuously. When the chemical treatment water passes through the five-stage treatment unit 8 in sequence, denitrification reaction can be carried out to carry out biochemical denitrification and phosphorus removal treatment. In this embodiment, the arrangement order of the five-stage treatment unit 8 can ensure the treatment effect of the Maotai-flavor liquor wastewater. A reflux pump 17 is also arranged between the five-stage treatment units 8 to reflux the nitrified liquid. The reflux pump 17 can be arranged between the first aerobic unit and the first anoxic unit, or between the first aerobic unit and the anaerobic unit. At this time, the nitrified liquid can flow back from the outlet position of the first aerobic unit to the inlet position of the first anoxic unit or the anaerobic unit. The reflux ratio of the nitrification liquid is controlled according to the water quality index of the obtained Maotai-flavor liquor wastewater. When the denitrification reaction in the biochemical treatment unit is relatively intense, the reflux ratio of the nitrification liquid is relatively high.

[0063] It can be understood that this embodiment, by configuring the biochemical treatment unit as a five-stage treatment unit 8 and a reflux pump 17, and by reasonably arranging the order of the five-stage treatment unit 8 and the position of the reflux pump 17, can further improve the treatment effect of the Maotai-flavor liquor wastewater treatment system by ensuring the degree of denitrification reaction in the biochemical treatment unit, and can further improve the ability of the disposal system to perform adaptive treatment according to the water quality indicators of the Maotai-flavor liquor wastewater.

[0064] Specifically, the regulating unit 2 is a regulating tank, and anaerobic sludge and a sludge stirring device for stirring the anaerobic sludge are arranged in the regulating unit 2.

[0065] like Figure 1As shown, in this embodiment, it is exemplarily explained that the regulating unit 2 can be set as a regulating tank, and anaerobic sludge can be arranged inside it. The concentration of anaerobic sludge and the hydraulic retention time in the regulating unit 2 can be set accordingly according to the water quality index of the obtained Maotai-flavor liquor wastewater to ensure the effect of the hydrolysis acidification reaction in the regulating unit 2. A sludge stirring device is also provided in the regulating unit 2. The sludge stirring device can be a stirring assembly driven by a driving device such as a motor. The stirring assembly can include a stirring shaft driven by the output end of the motor and a stirring blade arranged on the stirring shaft. After the Maotai-flavor liquor wastewater is filtered through the filtering unit 1 and enters the regulating unit 2, the Maotai-flavor liquor wastewater and the anaerobic sludge in the regulating unit 2 can be stirred by the stirring device so that the two are fully mixed to further improve the effect of the hydrolysis acidification reaction. The pre-treated water produced in the regulating unit 2 can be lifted to the anaerobic treatment unit by a pump.

[0066] It can be understood that this embodiment reasonably sets the structure of the regulating unit 2 and provides a stirring device in the regulating unit 2, so as to ensure that the regulating unit 2 provides a favorable environment for the hydrolysis and acidification reaction of macromolecular organic matter in the regulating unit 2.

[0067] Specifically, the chemical denitrification and phosphorus removal unit 6 is a reaction tank, and divalent magnesium ions are added into the chemical denitrification and phosphorus removal unit 6 through a dosing device. A chemical stirring device is provided in the chemical denitrification and phosphorus removal unit 6, and the chemical stirring device is used to stir the anaerobic treatment water produced after the divalent magnesium ions are added.

[0068] like Figure 1 As shown, in this embodiment, it is exemplified that the chemical denitrification and phosphorus removal unit 6 can be set as a reaction tank, and the pretreated water produced in the regulating unit 2 can also be supplied to the chemical denitrification and phosphorus removal unit 6 through the cooperation of the pump and the first transcending pipeline 13. The way of adding divalent magnesium ions can be to add magnesium chloride solution. At this time, the dosing device can include a first container and a first valve. The outlet of the first container can be set at its bottom and face the chemical denitrification and phosphorus removal unit 6. The magnesium chloride solution can be temporarily stored in the first container. The first valve can be set at the outlet of the first container. When the first valve is opened, the magnesium chloride solution can be added to the chemical denitrification and phosphorus removal unit 6 under the action of dead weight or pressure. The structure and principle of the chemical stirring device can be similar to the sludge stirring device, and the main difference can be the difference in stirring blades. The chemical stirring device can stir the anaerobic treatment water produced after the addition of divalent magnesium ions, so that the phosphate and ammonium ions produced in the previous step are precipitated in the form of magnesium amine phosphate solids.

[0069] It can be understood that, in this embodiment, the structure of the chemical denitrification and phosphorus removal unit 6 is reasonably set, and a stirring device is provided in the chemical denitrification and phosphorus removal unit 6, so as to ensure that phosphate and ammonium ions react fully with divalent magnesium ions.

[0070] More specifically, the chemical precipitation unit 7 is a precipitation tank, and polyaluminium chloride and polyacrylamide are added into the chemical precipitation unit 7 through a dosing device.

[0071] like Figure 1 As shown, in this embodiment, it is exemplified that the chemical precipitation unit 7 can be a sedimentation tank continuously arranged with the chemical denitrification and phosphorus removal unit 6, that is, the anaerobic treatment water can enter the chemical precipitation tank under the action of self-weight or pressure after adding divalent magnesium ions and stirring. In the chemical precipitation tank, the anaerobic treatment water after adding divalent magnesium ions can be further added with polyaluminum chloride (PAC) and polyacryl icamide (PAM), and polyaluminum chloride and polyacryl amide can be added in the form of solution. The dosing device can also include a second container, a second valve, a third container and a third valve, wherein the second container and the third container can be used for temporarily storing polyaluminum chloride solution and polyacrylamide solution, respectively, and the second valve and the third valve can be respectively arranged at the bottom of the second container and the third container, and the bottom is its outlet position. When the second valve and the third valve are opened, the polyaluminum chloride solution and the polyacryl amide solution can be added to the chemical precipitation unit 7 under the action of self-weight or pressure. After coagulation and precipitation by polyaluminium chloride and polyacrylamide, the supernatant of the chemical precipitation unit 7 is the chemically treated product water.

[0072] It can be understood that, in this embodiment, by reasonably arranging the structures of the chemical precipitation unit 7 and the dosing device, it is convenient to perform coagulation and precipitation on the anaerobic treatment water produced after the addition of divalent magnesium ions.

[0073] Specifically, a biochemical precipitation unit is arranged at the outlet of the biochemical treatment unit, a sludge return pipe is arranged in the biochemical precipitation unit, and the outlet of the sludge return pipe is arranged at the inlet of the biochemical treatment unit.

[0074] like Figure 1 As shown, in this embodiment, it is exemplified that the biochemical precipitation unit can also be set as a sedimentation tank, and the sedimentation tank can be continuously set at the end of the five-stage biochemical treatment unit. When the biochemical treatment water is discharged from the five-stage biochemical treatment unit, it can enter the biochemical precipitation unit for sludge precipitation. A sludge return pipe is provided in the biochemical precipitation unit, and one end of the sludge return pipe away from the biochemical precipitation unit can extend to the entrance position of the biochemical treatment unit. The sludge deposited in the biochemical precipitation unit can be re-flowed back to the biochemical treatment unit through the sludge return pipe, and the sludge return can be driven by a pump.

[0075] It can be understood that, in this embodiment, by providing a biochemical precipitation unit and providing a sludge return pipe between the biochemical precipitation unit and the biochemical treatment unit, it is convenient to precipitate the sludge in the biochemical treatment produced water and to realize the reuse of the sludge.

[0076] Specifically, the first anaerobic unit 3 is an anaerobic baffle reactor, the second anaerobic unit 5 is an upflow anaerobic sludge blanket reactor, the first anaerobic unit 3 and the second anaerobic unit 5 are connected in series, and an anaerobic sedimentation tank 4 is arranged between the first anaerobic unit 3 and the second anaerobic unit 5 .

[0077] like Figure 1 As shown, in this embodiment, it is exemplarily explained that the first anaerobic unit 3 and the second anaerobic unit 5 are operated in series, wherein the first anaerobic unit 3 is configured as an anaerobic baffled reactor (ABR), and the second anaerobic unit 5 is configured as an upflow anaerobic sludge blanket reactor (UASB). The anaerobic sedimentation tank 4 is arranged between the first anaerobic unit 3 and the second anaerobic unit 5, and is used to precipitate the effluent of the first anaerobic unit 3. After precipitation, the supernatant in the anaerobic sedimentation tank 4 can enter the second anaerobic unit 5 through a lift pump.

[0078] It can be understood that, in this embodiment, by reasonably arranging the structures of the first anaerobic unit 3 and the second anaerobic unit 5, it is convenient to realize the anaerobic treatment of the pre-treated produced water.

[0079] Embodiment 2

[0080] Embodiment 2 of the present application provides a method for treating Maotai-flavor liquor wastewater, which comprises the following steps:

[0081] S100, obtain water quality index of Maotai-flavor liquor wastewater;

[0082] S200, filtering the Maotai-flavor liquor wastewater, and subjecting the filtered Maotai-flavor liquor wastewater to a hydrolysis and acidification reaction to obtain pre-treated product water;

[0083] S300, subjecting the pretreated produced water to an anaerobic hydrogen-methane reaction, and subjecting the supernatant of the pretreated produced water after the hydrogen-methane reaction to an anaerobic hydrolysis and acidification reaction, to obtain anaerobic treated produced water, wherein part of the pretreated produced water is directly supplied to the outlet position of the anaerobic treated produced water, or part of the pretreated produced water after the hydrogen-methane reaction is directly supplied to the outlet position of the anaerobic treated produced water, and the flow rate of part of the pretreated produced water directly supplied to the outlet position of the anaerobic treated produced water or the pretreated produced water after the hydrogen-methane reaction is determined by the water quality index of the Maotai-flavor liquor wastewater;

[0084] S400, adding divalent magnesium ions to the anaerobic treatment produced water, and continuing to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after the addition of divalent magnesium ions for coagulation and precipitation to obtain chemically treated produced water;

[0085] S500, performing biochemical denitrification and phosphorus removal treatment on the chemically treated produced water to obtain biochemically treated produced water;

[0086] S600, performing ozone oxidation treatment on the biochemical treatment produced water, and adding polyaluminium chloride and polyacrylamide to the biochemical treatment produced water after the ozone oxidation treatment for coagulation and precipitation to obtain discharged water;

[0087] S700. Obtain the water quality index of the discharged water, and determine whether the water quality index of the discharged water meets the discharge standard; if not, resupply the discharged water to the inlet position of the pre-treated water product to serve as the sauce-flavor liquor wastewater of the next treatment process, and in the next treatment process, adjust the flow rate of the pre-treated water product directly supplied to the outlet position of the anaerobic treatment water product, or adjust the flow rate of the pre-treated water product after the hydrogen and methane production reactions directly supplied to the outlet position of the anaerobic treatment water product.

[0088] like Figure 1 and Figure 2 As shown, in step S100, the water quality indicators of Maotai-flavor liquor wastewater include but are not limited to COD Cr concentration, ammonia nitrogen concentration, total nitrogen concentration (TN) and total phosphorus concentration (TP).

[0089] In step S200, it is exemplified that the Maotai-flavor liquor wastewater can be filtered through the filtering unit 1, and the filtering unit 1 can be a device such as a filter net. The filtered Maotai-flavor liquor wastewater can be subjected to a hydrolysis and acidification reaction in the regulating unit 2, and the regulating unit 2 can be a regulating tank. The filtering unit 1 and the regulating unit 2 can constitute a pretreatment unit for pretreating the Maotai-flavor liquor wastewater to obtain pretreated product water.

[0090] In step S300, the pretreated water can undergo an anaerobic hydrogen-methane production reaction in the first anaerobic unit 3, and the supernatant of the pretreated water after the hydrogen-methane production reaction can undergo an anaerobic hydrolysis acidification reaction in the second anaerobic unit 5. The first anaerobic unit 3 can be an anaerobic baffle reactor, and the second anaerobic unit 5 can be an upflow anaerobic sludge blanket reactor. The pretreated water after the hydrogen-methane production reaction can be precipitated by an anaerobic sedimentation tank 4 provided between the first anaerobic unit 3 and the second anaerobic unit 5. The first anaerobic unit 3 and the second anaerobic unit 5 can constitute an anaerobic treatment unit to treat the pretreated water and obtain anaerobic treatment water. At the same time, part of the pretreated water can also be directly supplied to the outlet position of the anaerobic treatment water according to the water quality index of the obtained sauce-flavor liquor wastewater. This step can be completed by the first bypass pipe 13 in Example 1. Alternatively, part of the pre-treated water produced after the hydrogen and methane production reactions can be directly supplied to the outlet of the anaerobic treatment water. This step can be completed through the second bypass pipeline 14 in the first embodiment.

[0091] In step S400, the anaerobic treatment water can be added with divalent magnesium ions in the chemical denitrification and phosphorus removal unit 6, and the divalent magnesium ions can be added to the chemical denitrification and phosphorus removal unit 6 in the form of magnesium chloride solution through a dosing device. The anaerobic treatment water after adding divalent magnesium ions can continue to be coagulated and precipitated by adding polyaluminum chloride and polyacrylamide in the chemical precipitation unit 7, and polyaluminum chloride and polyacrylamide can be added in the form of solution through a dosing device. The chemical denitrification and phosphorus removal unit 6 and the chemical precipitation unit 7 can constitute a chemical treatment unit to treat the anaerobic treatment water and obtain chemical treatment water.

[0092] In step S500, the chemical treatment water can be subjected to biochemical denitrification and phosphorus removal treatment by a biochemical treatment unit to obtain biochemical treatment water. The biochemical treatment unit can include a five-stage treatment unit 8 consisting of an anaerobic unit, a primary anoxic unit, a primary aerobic unit, a secondary anoxic unit, and a secondary aerobic unit.

[0093] In step S600, the biochemical treatment water can be subjected to ozone oxidation treatment in the ozone oxidation unit 10, and the biochemical treatment water after the ozone oxidation treatment can be subjected to coagulation and precipitation of polyaluminum chloride and polyacrylamide in the final sedimentation unit 12. The ozone oxidation unit 10 and the final sedimentation unit 12 can constitute a deep treatment unit to treat the biochemical treatment water and obtain discharged water.

[0094] In step S700, the water quality indicators of the discharged water also include but are not limited to COD CrConcentration, ammonia nitrogen concentration, total nitrogen concentration (TN) and total phosphorus concentration (TP). When the water quality index of the discharged water does not meet the discharge standard, the discharged water can be reintroduced into the treatment system provided in Example 1 for secondary treatment. During the secondary treatment, that is, according to the water quality index of the discharged water, the flow rate of the pretreated water produced in the next treatment process directly supplied to the outlet position of the anaerobic treatment water produced is adjusted, or the flow rate of the pretreated water produced after the hydrogen and methane production reactions in the next treatment process directly supplied to the outlet position of the anaerobic treatment water produced is adjusted. Specifically, it can be adjusted by controlling the opening of the first bypass pipe 13 and the second bypass pipe 14.

[0095] The present invention can realize the COD control of the chemical treatment water produced by the chemical treatment unit by coarse adjustment and fine adjustment. Cr / TN value is precisely adjusted so that the water produced by chemical treatment can be well treated in the biochemical treatment unit, and further, during the entire brewing cycle of Maotai-flavor liquor, the treatment of Maotai-flavor liquor wastewater will not be poorly treated as the number of wine extraction rounds increases and the water quality indicators change, thus avoiding the situation where the treatment fails to meet the emission standards or causes cost waste.

[0096] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A Maotai-flavor liquor wastewater treatment system, characterized in that: The Maotai-flavor liquor wastewater treatment system is used to treat Maotai-flavor liquor wastewater, and the Maotai-flavor liquor wastewater treatment system comprises: A pretreatment unit, comprising a filtering unit (1) and a regulating unit (2), wherein the Maotai-flavor liquor wastewater passes through the filtering unit (1) and the regulating unit (2) in sequence, wherein the filtering unit (1) filters the Maotai-flavor liquor wastewater, and the regulating unit (2) causes the filtered Maotai-flavor liquor wastewater to undergo a hydrolysis and acidification reaction to obtain pretreated product water; The anaerobic treatment unit comprises a first anaerobic unit (3) and a second anaerobic unit (5), wherein the pretreated produced water passes through the first anaerobic unit (3) and the second anaerobic unit (5) in sequence, wherein the first anaerobic unit (3) causes the pretreated produced water to undergo an anaerobic reaction of producing hydrogen and methane, and the second anaerobic unit (5) causes the supernatant of the pretreated produced water after the reaction of producing hydrogen and methane to undergo an anaerobic hydrolysis and acidification reaction to obtain anaerobic treated produced water; A chemical treatment unit, comprising a chemical denitrification and phosphorus removal unit (6) and a chemical precipitation unit (7), wherein the anaerobic treatment produced water passes through the chemical denitrification and phosphorus removal unit (6) and the chemical precipitation unit (7) in sequence, wherein the chemical denitrification and phosphorus removal unit (6) adds divalent magnesium ions to the anaerobic treatment produced water, and the chemical precipitation unit (7) continues to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after the addition of divalent magnesium ions for coagulation and precipitation, so as to obtain chemical treatment produced water; A biochemical treatment unit, wherein the chemically treated water passes through the biochemical treatment unit, and the biochemical treatment unit performs biochemical denitrification and dephosphorization treatment on the chemically treated water to obtain biochemically treated water; A deep treatment unit, comprising an ozone oxidation unit (10) and a final settling unit (12), wherein the biochemically treated water passes through the ozone oxidation unit (10) and the final settling unit (12) in sequence, wherein the ozone oxidation unit (10) performs ozone oxidation treatment on the biochemically treated water, and the final settling unit (12) adds polyaluminium chloride and polyacrylamide to the biochemically treated water after the ozone oxidation treatment for coagulation and sedimentation, so as to obtain discharged water; A first bypass pipe (13) is provided between the regulating unit (2) and the chemical denitrification and phosphorus removal unit (6), and a second bypass pipe (14) is provided between the first anaerobic unit (3) and the chemical denitrification and phosphorus removal unit (6). The first bypass pipe (13) is used to supply the pretreated water produced after the hydrolysis and acidification reaction to the chemical treatment unit so as to roughly adjust the CODCr / TN value in the chemical treatment unit; the second bypass pipe (14) is used to supply the pretreated water produced after the hydrogen and methane production reactions to the chemical treatment unit so as to finely adjust the CODCr / TN value in the chemical treatment unit; the first bypass pipe (13) and the second bypass pipe (14) are configured to control their openings according to the water quality index of the Maotai-flavor liquor wastewater.

2. The Maotai-flavor liquor wastewater treatment system according to claim 1, characterized in that: The Maotai-flavor liquor wastewater treatment system further comprises a membrane bioreactor unit (9); the Maotai-flavor liquor wastewater passes through the membrane bioreactor unit (9) after passing through the biochemical treatment unit and before passing through the ozone oxidation unit (10); a third bypass pipe (15) is provided between the biochemical treatment unit and the ozone oxidation unit (10); the third bypass pipe (15) is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater or the biochemical treatment water product.

3. The Maotai-flavor liquor wastewater treatment system according to claim 2, characterized in that: The deep treatment unit further comprises an activated carbon filter unit (11); the biochemical treatment produced water further passes through the activated carbon filter unit (11) after passing through the ozone oxidation unit (10) and before passing through the final sedimentation unit (12); a fourth bypass pipe (16) is provided between the ozone oxidation unit (10) and the final sedimentation unit (12); the fourth bypass pipe (16) is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater.

4. The Maotai-flavor liquor wastewater treatment system according to claim 3 is characterized in that: The biochemical treatment unit comprises a five-stage treatment unit (8) and a reflux pump (17). The five-stage treatment unit (8) comprises an anaerobic unit, a primary anoxic unit, a primary aerobic unit, a secondary anoxic unit and a secondary aerobic unit in sequence. The reflux pump (17) is connected between the five-stage treatment units (8) and is used for reflux of nitrification liquid. The inlet of the reflux pump (17) is the outlet position of the primary aerobic unit, and the outlet of the reflux pump (17) is the inlet position of the primary anoxic unit and the anaerobic unit. The reflux pump (17) is configured to control its opening according to the water quality index of the Maotai-flavor liquor wastewater.

5. The Maotai-flavor liquor wastewater treatment system according to claim 1, characterized in that: The regulating unit (2) is a regulating tank, and anaerobic sludge and a sludge stirring device for stirring the anaerobic sludge are arranged in the regulating unit (2).

6. The Maotai-flavor liquor wastewater treatment system according to claim 1, characterized in that: The chemical denitrification and dephosphorization unit (6) is a reaction tank, the divalent magnesium ions are added into the chemical denitrification and dephosphorization unit (6) through a dosing device, and a chemical stirring device is provided in the chemical denitrification and dephosphorization unit (6), and the chemical stirring device is used to stir the anaerobic treatment product water after the divalent magnesium ions are added.

7. The Maotai-flavor liquor wastewater treatment system according to claim 6, characterized in that: The chemical precipitation unit (7) is a precipitation tank, and the polyaluminium chloride and the polyacrylamide are added into the chemical precipitation unit (7) through the dosing device.

8. The Maotai-flavor liquor wastewater treatment system according to claim 1, characterized in that: A biochemical precipitation unit is arranged at the outlet of the biochemical treatment unit, and a sludge return pipe is arranged at the biochemical precipitation unit. The outlet of the sludge return pipe is arranged at the inlet of the biochemical treatment unit.

9. The Maotai-flavor liquor wastewater treatment system according to claim 1, characterized in that: The first anaerobic unit (3) is an anaerobic baffle reactor, the second anaerobic unit (5) is an upflow anaerobic sludge blanket reactor, the first anaerobic unit (3) and the second anaerobic unit (5) are connected in series, and an anaerobic sedimentation tank (4) is arranged between the first anaerobic unit (3) and the second anaerobic unit (5).

10. A method for treating Maotai-flavor liquor wastewater, characterized in that: The method for treating Maotai-flavor liquor wastewater is implemented by the Maotai-flavor liquor wastewater treatment system according to any one of claims 1 to 9, and the method for treating Maotai-flavor liquor wastewater comprises: Obtain water quality indicators of Maotai-flavor liquor wastewater; Filtering the Maotai-flavor liquor wastewater, and subjecting the filtered Maotai-flavor liquor wastewater to a hydrolysis and acidification reaction to obtain pre-treated product water; The pretreated produced water is subjected to an anaerobic hydrogen-methane production reaction, and the supernatant of the pretreated produced water after the hydrogen-methane production reaction is subjected to an anaerobic hydrolysis acidification reaction to obtain anaerobic treated produced water, wherein part of the pretreated produced water is directly supplied to the outlet position of the anaerobic treated produced water, or part of the pretreated produced water after the hydrogen-methane production reaction is directly supplied to the outlet position of the anaerobic treated produced water, and the flow rate of the part of the pretreated produced water directly supplied to the outlet position of the anaerobic treated produced water or the pretreated produced water after the hydrogen-methane production reaction is determined by the water quality index of the Maotai-flavor liquor wastewater; Adding divalent magnesium ions to the anaerobic treatment produced water, and continuing to add polyaluminium chloride and polyacrylamide to the anaerobic treatment produced water after adding the divalent magnesium ions for coagulation and precipitation to obtain chemically treated produced water; Performing biochemical denitrification and phosphorus removal on the chemically treated produced water to obtain biochemically treated produced water; The biochemical treatment produced water is subjected to ozone oxidation treatment, and polyaluminium chloride and polyacrylamide are added to the biochemical treatment produced water after the ozone oxidation treatment for coagulation and precipitation to obtain discharged water; The water quality index of the discharged water is obtained, and it is determined whether the water quality index of the discharged water meets the discharge standard; if not, the discharged water is re-supplied to the inlet position of the pre-treated water product to serve as the Maotai-flavor liquor wastewater of the next treatment process, and in the next treatment process, the flow rate of the pre-treated water product directly supplied to the outlet position of the anaerobic treatment water product is adjusted, or the flow rate of the pre-treated water product after hydrogen and methane production reactions directly supplied to the outlet position of the anaerobic treatment water product is adjusted.

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