Anaerobic ammonia oxidation treatment system and method for wine brewing wastewater

Abstract

The invention provides an anaerobic ammonia oxidation treatment system and method for wine-making wastewater, the treatment system removes COD (Chemical Oxygen Demand) in high-concentration organic wine-making wastewater through an anaerobic digestion unit, most of the wastewater is converted into biogas, then the biogas is subjected to dehydration, desulfurization and membrane separation of CO2 through a biogas treatment unit, and the biogas with the CH4 content of 90% or above is obtained and can be used for power generation; anaerobic digestion effluent enters an MBBR-PN / A unit for denitrification, then passes through a deep biochemical unit for further removal of nitrate nitrogen, finally enters a deep treatment unit for disinfection, and is discharged after reaching the standard; excess sludge generated by the units is adjusted by a sludge tank, dewatered by a filter press and then enters a fermentation tower, a compound fertilizer is prepared after composting, residual heat of distillation tower residue is collected by a heat energy recovery unit, and the residual heat is transferred to an MBBR-PN / A unit or an anaerobic composting fermentation tower according to seasons. According to the invention, coupling of the anaerobic digestion unit and the MBBR-PN / A unit is taken as a core process, so that raw water is prevented from being used as a carbon source supply, the recovery rate of organic matters in the system is enhanced, and resource utilization and up-to-standard discharge of the wine brewing wastewater are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to an anaerobic ammonia oxidation treatment system and method for brewing wastewater. Background Art

[0002] As people's living standards continue to improve, the brewing industry, as an important branch of the food industry, has shown a clear expansion in market demand and production scale. In this process, the treatment of brewing wastewater has gradually become a prominent environmental issue that cannot be ignored in the development of the industry. Brewing wastewater has unique composition characteristics, especially high chemical oxygen demand (COD), ammonia nitrogen (NH 3 -N) and suspended solids (SS) content, posing a great potential threat to the environment.

[0003] Brewing wastewater can be divided into two categories according to the concentration of organic matter: low-concentration organic wastewater and high-concentration organic wastewater. Low-concentration organic wastewater mainly comes from cooling water, bottle washing water, and site washing water; high-concentration organic wastewater comes from bottom pot water, yellow water, and grain soaking water. These wastewaters contain a large amount of organic matter such as starch, protein, and sugar that has not been completely converted. At the same time, they may also be mixed with heavy metals and other harmful chemicals. If they are directly discharged into the water body, it will cause water quality deterioration and affect the ecological environment and human health.

[0004] At present, the main treatment technologies for brewing wastewater are physical and chemical methods and biological methods, including coagulation and sedimentation, advanced oxidation, flotation, aerobic treatment, etc. The combination of these treatment technologies can generally achieve a good treatment effect on brewing wastewater, but they often ignore the resources contained in the wastewater, and the direct greenhouse gas emissions caused by the traditional process itself and the indirect emissions caused by high energy consumption. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a system and method for anaerobic ammonia oxidation treatment of brewing wastewater.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides an anaerobic ammonia oxidation treatment system for brewing wastewater, which comprises an anaerobic digestion unit, an MBBR-PN / A unit, a deep biochemical unit and a deep treatment unit connected in sequence, wherein the anaerobic digestion unit is also connected to a biogas treatment unit, and the anaerobic digestion unit, the MBBR-PN / A unit and the deep biochemical unit are all connected to a sludge treatment unit; wherein the anaerobic digestion unit is used to perform anaerobic digestion on the wastewater, converting organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H2 O, and perform mud and water separation, then the generated raw biogas is transported to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit; the biogas treatment unit is used to purify and refine the generated raw biogas; the MBBR-PN / A unit is used to denitrify the wastewater and remove most of the ammonia nitrogen; the deep biochemical unit is used to treat the remaining nitrate nitrogen in the wastewater and perform mud and water separation; the sludge treatment unit is used to sequentially regulate, dehydrate and treat the remaining sludge generated by the treatment system in an anaerobic composting fermentation tower; the deep treatment unit is used to disinfect the wastewater with chlorine dioxide to remove pathogenic bacteria and make the effluent meet the discharge standard.

[0008] Furthermore, the anaerobic digestion unit includes a connected anaerobic reactor and an anaerobic sedimentation tank; wherein the anaerobic reactor is used to decompose organic matter under anaerobic conditions using anaerobic microorganisms, including four stages of hydrolysis, acidification, acid production and methanogenesis, to convert organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2 The anaerobic sedimentation tank is used to separate the effluent from the anaerobic reactor into mud and water, and to transport the supernatant produced by the separation to the MBBR-PN / A unit.

[0009] Furthermore, the pretreatment unit includes a high-concentration regulating tank and a low-concentration regulating tank; wherein the high-concentration regulating tank is arranged before the anaerobic reactor, and is used to regulate the water quality and water quantity of the high-concentration organic wastewater; the low-concentration regulating tank is arranged before the deep biochemical unit, and is used to regulate the water quality and water quantity of the low-concentration organic wastewater.

[0010] Furthermore, the deep biochemical unit includes an A / O tank and a deep biochemical sedimentation tank; wherein the A / O tank is used to use low-concentration organic wastewater as a carbon source to treat residual nitrate nitrogen in the wastewater; the deep biochemical sedimentation tank is used to separate mud and water from the effluent of the A / O tank, and transport the generated supernatant to the deep treatment unit; the treatment system also includes a blower, which is used to aerate the MBBR-PN / A unit and the deep biochemical unit.

[0011] Furthermore, the biogas processing unit includes a biogas dehydration and desulfurization tank and a biogas membrane separation device; wherein the biogas dehydration and desulfurization tank is used to sequentially dehydrate, desulfurize and filter and remove particulate matter from the raw biogas; the biogas membrane separation device is used to use the gas partial pressure difference on both sides of the membrane as a driving force, and utilize the different permeation rates of the components in the mixed gas in the gas separation membrane to separate the components, and after the primary membrane separation and the secondary membrane separation, CH 4Purification and CO 2 of removal.

[0012] Furthermore, the MBBR-PN / A unit comprises a first reactor cell and a second reactor cell connected in sequence, a honeycomb suspended carrier is added into the first reactor cell, anaerobic ammonia-oxidizing bacteria are attached to the honeycomb suspended carrier, and the honeycomb suspended carrier is used for shearing and colliding in water to make the bubbles smaller, thereby increasing the oxygen transfer efficiency and reducing the aeration amount; during operation, the dissolved oxygen concentration is controlled between 0.3 and 0.6 mg / L, and organic nitrogen and ammonia nitrogen are converted into nitrite nitrogen through short-range nitrification, and the anaerobic ammonia-oxidizing bacteria use nitrite nitrogen as an electron acceptor to oxidize ammonia nitrogen into nitrogen gas; the second reactor cell is used to form anaerobic ammonia-oxidizing granular sludge by bottom aeration, further remove ammonia nitrogen in wastewater, and has a built-in integrated mud and water separation device, and a matching air lift sludge return device to return the sludge to the front end of the unit.

[0013] Furthermore, the sludge treatment unit includes a sludge tank, a filter press dewatering machine and an anaerobic composting fermentation tower which are connected in sequence; wherein the sludge tank is used to regulate the residual sludge generated by the treatment system; the filter press dewatering machine is used to dehydrate the regulated sludge to a water content of 65% to 70%; the anaerobic composting fermentation tower is used to deodorize, sterilize and humify the dehydrated sludge, and during the composting process, the pH is controlled at 6.0 to 8.5, the temperature at 50°C to 60°C and the C / N at 20:1 to 30:1.

[0014] Furthermore, the heat recovery unit includes a wide-channel plate heat exchanger and a heat dissipation platform connected in sequence; wherein the wide-channel plate heat exchanger is used to recover heat energy in the bottom liquid of the high-temperature distillation tower, and utilizes the narrow channels between the plates to achieve heat exchange, and controls the operating pressure to be 3-5MPa; the heat dissipation platform is used to transfer the recovered waste heat to other units, to the MBBR-PN / A unit in winter to ensure its optimal operating temperature of 30-35°C, and to the anaerobic composting fermentation tower in summer to reduce its high-temperature fermentation energy consumption.

[0015] The present invention also provides an anaerobic ammonium oxidation treatment method for brewery wastewater, which is applied to the above-mentioned brewery wastewater anaerobic ammonium oxidation treatment system; the treatment method comprises: the anaerobic digestion unit performs anaerobic digestion on the wastewater entering the treatment system, converting the organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2O-based crude biogas is produced, and mud and water are separated, and then the produced crude biogas is transported to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit; the biogas treatment unit purifies and refines the produced crude biogas; the MBBR-PN / A unit denitrifies the wastewater; the deep biochemical unit treats the remaining nitrate nitrogen in the wastewater and separates mud and water; the sludge treatment unit sequentially regulates, dehydrates and treats the residual sludge produced by the treatment system in an anaerobic composting fermentation tower; the deep treatment unit uses chlorine dioxide to disinfect the wastewater to remove pathogenic bacteria and ensure that the effluent meets the discharge standard.

[0016] Furthermore, the treatment method also includes: after the anaerobic composting fermentation tower, the sludge is dried, crushed, and extruded into granules to produce organic compound fertilizer for agricultural production.

[0017] Furthermore, the processing method also includes: a heat recovery unit is used to transfer the recovered waste heat to other units to reduce energy consumption.

[0018] Compared with the prior art, the technical solution provided by the present invention has at least the following advantages:

[0019] The present invention provides a system and method for treating brewery wastewater with anaerobic ammonia oxidation. The treatment system removes COD in high-concentration organic wastewater from brewery through an anaerobic digestion unit, converts most of it into biogas, and then dehydrates, desulfurizes, and separates CO through a membrane through a biogas treatment unit. 2 After that, we get CH 4 Biogas with a content of more than 90% can be used for power generation; the effluent from anaerobic digestion enters the MBBR-PN / A unit for denitrification, and then further removes nitrate nitrogen in the deep biochemical unit, and finally enters the deep treatment unit for disinfection, and is discharged after reaching the "Emission Standard of Water Pollutants for Fermented Alcohol and Liquor Industry" (GB 27631-2011); the residual sludge produced by the above units is dehydrated by a filter press dehydrator and then treated in an anaerobic composting fermentation tower, and then dried, crushed, and extruded into organic compound fertilizer. The present invention uses the coupling of the anaerobic digestion unit and the MBBR-PN / A unit as the core process, avoids the use of raw water as a carbon source, enhances the recovery rate of organic matter in the system, and realizes the resource utilization and standard discharge of brewing wastewater.

[0020] The present invention is provided with an anaerobic digestion unit, which mainly includes an anaerobic reactor and an anaerobic sedimentation tank. Winery wastewater often contains extremely high organic matter, and the COD can reach more than 40,000 mg / L. If the traditional biochemical treatment process is directly used, not only a large amount of CO will be generated, but also a large amount of CO will be generated. 2The high aeration rate will also affect the sustainability of wastewater treatment from both economic and environmental aspects. However, the anaerobic digestion unit uses anaerobic microorganisms to decompose organic matter under anaerobic conditions, including four stages of hydrolysis, acidification, acid production and methanogenesis, converting most of the organic matter in the wastewater into biogas, which can be used as clean energy for power generation after treatment. In addition, combined with the unique advantage of the anaerobic ammonium oxidation process that does not require an external carbon source, more raw water can be used for anaerobic digestion to produce biogas, which improves the economic and environmental benefits compared to the combination with the traditional denitrification process.

[0021] The present invention is provided with a biogas processing unit, in which the crude biogas produced by the anaerobic digestion unit is subjected to dehydration, desulfurization, membrane separation and purification, CH 4 The recovery rate is above 95%, CO 2 The removal rate is above 99%, the treatment unit has a simple structure, the process is easy to operate, and high-purity CH 4 Used to generate electricity.

[0022] The present invention uses MBBR-PN / A unit as the core denitrification process. No organic carbon source and oxygen are required during the reaction process, which has obvious advantages over the traditional nitrification / denitrification denitrification method. It completely changes the traditional way of denitrification that requires the addition of carbon source in the past, and uses more organic matter for anaerobic digestion to produce biogas for power generation, saving more than 60% of aeration energy consumption, which also means less CO 2 At the same time, the anaerobic ammonium oxidation process can also minimize the production of residual sludge, thereby saving a lot of sludge disposal costs. It is a sustainable, green and low-carbon wastewater biological denitrification technology.

[0023] The present invention sets up a deep biochemical unit after the MBBR-PN / A unit. Since the effluent of the MBBR-PN / A unit contains a certain amount of nitrate nitrogen, it needs to be removed in this unit. The COD of low-concentration organic water is 600-800 mg / L, NH 3 -N is 50-80 mg / L, which can be used as a denitrification carbon source to supply the A / O pool. The effluent from the A / O pool is then disinfected in a deep biochemical sedimentation tank and a deep treatment unit before being discharged, thus achieving the rational allocation and utilization of wastewater resources and meeting discharge standards.

[0024] The present invention is provided with a sludge treatment unit, including a sludge tank, a filter press dewatering machine and an anaerobic composting fermentation tower. Brewing wastewater sludge contains more nutrients such as protein, organic matter, nitrogen, phosphorus, magnesium, etc., and has a lower heavy metal content. Compared with the residual sludge of urban sewage, it is more suitable for making organic compound fertilizer. The present invention utilizes this characteristic, first dehydrates the sludge to a standard moisture content through a filter press dewatering machine, then deodorizes, sterilizes, and humifies it through an anaerobic composting fermentation tower, and finally dries, crushes, and extrudes granules to make organic fertilizer, thereby achieving full utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute proportional limitations.

[0026] Figure 1 It is a schematic diagram of the structure of the anaerobic ammonia oxidation treatment system for brewing wastewater provided by an embodiment of the present invention.

[0027] In the figure, 1- low concentration regulating tank, 2- high concentration regulating tank, 3- anaerobic reactor, 4- anaerobic sedimentation tank, 5- blower, 6- MBBR-PN / A unit, 7- A / O tank, 8- deep biochemical sedimentation tank, 9- deep treatment unit, 10- sludge tank, 11- filter press dehydrator, 12- anaerobic composting fermentation tower, 13- biogas dehydration and desulfurization tank, 14- biogas membrane separation device, 15- wide flow plate heat exchanger, 16- heat dissipation platform. DETAILED DESCRIPTION

[0028] The inventors have found that the Chinese National Invention Patent Publication No. (CN 114249488 A) discloses an aerated biological filter and treatment unit for brewing wastewater treatment, including a filter body, a filter filling component, an aeration component and a wastewater input component. The brewing wastewater is input into the filter filling component through the wastewater input component, and the effluent from the aeration filter enters the grid tank, the primary sedimentation tank, the regulating tank and the flocculation sedimentation tank. The flocculation sedimentation tank combines physical and biochemical processes to achieve efficient removal of pollutants, improve the pollutant removal rate, reduce the tank capacity, reduce the floor space, and reduce investment and operating costs. However, the invention only treats wastewater from the perspective of meeting discharge standards, ignoring the organic resources in the wastewater. At the same time, there will inevitably be a higher aeration volume and sludge production, and there is room for gain in both economic benefits and environmental impacts. In contrast, in order to achieve the synchronous development of brewing wastewater resource utilization and standard discharge, the present invention adopts anaerobic digestion process to remove organic matter in wastewater. High-concentration organic wastewater uses anaerobic microorganisms in anaerobic conditions to decompose organic matter, including four stages of hydrolysis, acidification, acid production and methanogenesis, to convert most of the organic matter in the wastewater into CH4 4 , CO 2 With a small amount of H 2 S and H 2 The gas obtained can be used for power generation after passing through the biogas treatment unit. The effluent from anaerobic digestion is denitrified by the anaerobic ammonium oxidation unit and disinfected by the deep treatment unit before being discharged in compliance with the emission standards.

[0029] The Chinese National Invention Patent Publication No. (CN 112592003 A) discloses a method for treating brewery wastewater, which includes: removing the slag from the wastewater, adjusting the acid and alkali, entering a two-stage parallel anaerobic reaction section to precipitate anaerobic sludge, adding chemicals to the flotation tank, and then entering a multi-stage aerobic section to precipitate aerobic sludge, and finally passing through an A 2 After the / O pool is aerated, the super magnetic phosphorus removal separates the chemical sludge and then discharges it. This invention achieves the standard treatment of brewing wastewater, and the waste gas and sludge are also properly disposed of, but the anaerobic denitrification process consumes a large amount of organic matter in the raw water, thereby reducing the amount of biogas produced by anaerobic digestion. At the same time, a higher aeration volume will also cause a large indirect carbon emission. From the perspective of resource utilization and carbon emission reduction, there is still room for optimization in this aspect. Different from it, the denitrification process of the present invention adopts MBBR-PN / A (moving bed membrane bioreactor-short-range nitrification / anaerobic ammonia oxidation) unit. No organic carbon source is required during the reaction process, so that more organic matter in the wastewater is used for anaerobic digestion to produce biogas and generate electricity. It has obvious advantages over traditional nitrification / denitrification denitrification methods, saving more than 60% of aeration energy consumption, and also reducing the residual sludge production to a minimum, saving a lot of sludge disposal costs, and the reduction in energy consumption also means a reduction in carbon emissions.

[0030] The present invention is described in detail below in conjunction with specific implementation modes.

[0031] The present invention provides an anaerobic ammonium oxidation treatment system for brewing wastewater, such as Figure 1 As shown, the treatment unit includes an anaerobic digestion unit, an MBBR-PN / A unit 6, a deep biochemical unit and a deep treatment unit 9 which are connected in sequence. The anaerobic digestion unit is also connected to a biogas treatment unit. The anaerobic digestion unit, the MBBR-PN / A unit 6 and the deep biochemical unit are all connected to the sludge treatment unit. The anaerobic digestion unit is used to perform anaerobic digestion on the wastewater, converting the organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2 O, and perform mud and water separation, then the generated raw biogas is transported to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit 6; the biogas treatment unit is used to purify and refine the generated raw biogas; the MBBR-PN / A unit 6 is used to denitrify the wastewater; the deep biochemical unit is used to treat the remaining nitrate nitrogen in the wastewater and perform mud and water separation; the sludge treatment unit is used to regulate, dehydrate and treat the remaining sludge generated by the treatment system in turn with the anaerobic composting fermentation tower 12; the deep treatment unit 9 is used to disinfect the wastewater with chlorine dioxide to remove pathogenic bacteria and make the effluent meet the discharge standard.

[0032] Furthermore, the anaerobic digestion unit includes an anaerobic reactor 3 and an anaerobic sedimentation tank 4 connected to each other; wherein the anaerobic reactor 3 is used to decompose organic matter under anaerobic conditions by using anaerobic microorganisms, including four stages of hydrolysis, acidification, acid production and methanogenesis, to convert organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2 The anaerobic sedimentation tank 4 is used to separate the mud and water from the effluent of the anaerobic reactor 3, and to transport the supernatant produced by the separation to the pretreatment unit.

[0033] Furthermore, the pretreatment unit includes a high-concentration regulating tank 2 and a low-concentration regulating tank 1; wherein the high-concentration regulating tank 2 is arranged before the anaerobic reactor 3, and is used to regulate the water quality and water quantity of the high-concentration organic wastewater; the low-concentration regulating tank 1 is arranged before the deep biochemical unit, and is used to regulate the water quality and water quantity of the low-concentration organic wastewater.

[0034] Furthermore, the deep biochemical unit includes an A / O (anaerobic / anoxic) tank 7 and a deep biochemical sedimentation tank 8; wherein the A / O tank 7 is used to utilize low-concentration organic wastewater as a carbon source to treat the remaining nitrate nitrogen in the wastewater; the deep biochemical sedimentation tank 8 is used to separate the mud and water from the effluent of the A / O tank 7, and transport the generated supernatant to the deep treatment unit 9; the treatment system also includes a blower 5, which is used to aerate the MBBR-PN / A unit 6 and the deep biochemical unit.

[0035] Furthermore, the biogas processing unit includes a biogas dehydration and desulfurization tank 13 and a biogas membrane separation device 14; wherein the biogas dehydration and desulfurization tank 13 is used to sequentially perform dehydration, dry fine desulfurization and filtration to remove particulate matter on the raw biogas; the biogas membrane separation device 14 is used to use the gas partial pressure difference on both sides of the membrane as a driving force, and utilize the different permeation rates of the components in the mixed gas in the gas separation membrane to separate the components, and after the primary membrane separation and the secondary membrane separation, CH 4 Recovery and CO 2 of removal.

[0036] Furthermore, the MBBR-PN / A unit 6 includes a first reactor cell and a second reactor cell connected in sequence. A honeycomb suspended carrier is added into the first reactor cell, and anaerobic ammonia-oxidizing bacteria are attached to the honeycomb suspended carrier. The honeycomb suspended carrier is used for shearing and colliding in water to make the bubbles smaller, thereby increasing the oxygen transfer efficiency and reducing the aeration volume. During operation, the dissolved oxygen concentration is controlled between 0.3 and 0.6 mg / L, and organic nitrogen and ammonia nitrogen are converted into nitrite nitrogen through short-range nitrification. The anaerobic ammonia-oxidizing bacteria use nitrite nitrogen as an electron acceptor to oxidize ammonia nitrogen into nitrogen gas. The second reactor cell is used to form anaerobic ammonia-oxidizing granular sludge by using bottom aeration to further remove ammonia nitrogen in wastewater, and has a built-in integrated mud-water separation device and a matching air lift sludge return device to return the sludge to the front end of the unit.

[0037] Furthermore, the sludge treatment unit includes a sludge pool 10, a filter press dewatering machine 11 and an anaerobic composting fermentation tower 12 which are connected in sequence; wherein the sludge pool 10 is used to regulate the residual sludge generated by the treatment system; the filter press dewatering machine 11 is used to dehydrate the regulated sludge to a water content of 65% to 70%; the anaerobic composting fermentation tower 12 is used to deodorize, sterilize and humify the dehydrated sludge, and during the composting process, the pH is controlled at 6.0 to 8.5, the temperature is controlled at 50°C to 60°C, and the C / N is controlled at 20:1 to 30:1.

[0038] Furthermore, the heat recovery unit includes a wide-channel plate heat exchanger 15 and a heat dissipation platform 16 connected in sequence; wherein the wide-channel plate heat exchanger 15 is used to recover the heat energy in the bottom liquid of the high-temperature distillation tower, and the narrow channels between the plates are used to realize heat exchange, and the operating pressure is controlled to be 3-5MPa; the heat dissipation platform 16 is used to transfer the recovered waste heat to other units, to the MBBR-PN / A unit in winter to ensure its optimal operating temperature of 30-35°C, and to the anaerobic composting fermentation tower in summer to reduce its high-temperature fermentation energy.

[0039] The present invention also provides an anaerobic ammonium oxidation treatment method for brewery wastewater, which is applied to the above-mentioned anaerobic ammonium oxidation treatment system for brewery wastewater; the treatment method comprises: an anaerobic digestion unit performs anaerobic digestion on the wastewater entering the treatment system, converting organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2O, and perform mud and water separation, then the generated raw biogas is transported to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit 6; the biogas treatment unit purifies and refines the generated raw biogas; the MBBR-PN / A unit 6 denitrifies the wastewater; the deep biochemical unit treats the remaining nitrate nitrogen in the wastewater and performs mud and water separation; the sludge treatment unit sequentially regulates, dehydrates and treats the remaining sludge generated by the treatment system in the sludge treatment tower 12; the deep treatment unit 9 uses chlorine dioxide to disinfect the wastewater to remove pathogenic bacteria and make the effluent meet the discharge standard.

[0040] Furthermore, the treatment method also includes: after the anaerobic composting fermentation tower 12, the sludge is dried, crushed, and extruded into granules to produce organic compound fertilizer for agricultural production.

[0041] Furthermore, the processing method also includes: a heat recovery unit is used to transfer the recovered waste heat to other units to reduce energy consumption.

[0042] Specifically, the present invention provides a system and method for anaerobic ammonia oxidation treatment of brewery wastewater, the treatment system comprising:

[0043] 1. Anaerobic digestion unit: mainly includes anaerobic reactor 3 and anaerobic sedimentation tank 4. After passing through the regulating tank, high-concentration organic wastewater enters anaerobic reactor 3 for anaerobic digestion, using anaerobic microorganisms to decompose organic matter under anaerobic conditions, including four stages of hydrolysis, acidification, acid production and methane production. The operating temperature is controlled at 32-36°C, pH at 7.3-7.9, and the operating time is 15-35 days. The organic matter in the wastewater is converted into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2 The crude biogas composed of O enters the biogas treatment unit for further purification and purification; the effluent from the anaerobic reactor 3 enters the anaerobic sedimentation tank 4 for mud-water separation, the sludge return ratio is controlled at 50-70%, and the supernatant enters the pretreatment unit.

[0044] 2. Biogas treatment unit: mainly includes biogas dehydration and desulfurization tank 13 and biogas membrane separation device 14. The raw biogas produced by anaerobic reactor 3 is partially dehydrated by water removal filter and then enters atmospheric pressure cold dryer for further dehydration. The dehydrated biogas enters dry fine desulfurization unit to make H 2 S decreased to 10 mg / m 3 Afterwards, the particles are removed by the filter. Then, the gas enters the biogas membrane separation device 14. The unit is mainly composed of the biogas membrane separation device 14. The gas partial pressure difference on both sides of the membrane is used as the driving force, and the different permeation rates of the components in the mixed gas in the gas separation membrane are used to separate the components. After the primary membrane separation and the secondary membrane separation, CH4 The recovery rate is above 95%, CO 2 The removal rate is above 99%.

[0045] 3. MBBR-PN / A unit 6: MBBR-PN / A unit 6 includes a first reactor cell and a second reactor cell connected in sequence. A certain amount of honeycomb suspended carriers suitable for the growth of anaerobic ammonia-oxidizing bacteria are added to the first reactor cell, which is completely mixed with the wastewater during aeration, which is conducive to their attachment and growth. At the same time, the shearing and collision of the suspended carriers in the water make the bubbles smaller, greatly increasing the oxygen transfer efficiency. Therefore, the required aeration volume is small. During operation, the dissolved oxygen concentration is controlled between 0.3 and 0.6 mg / L. Organic nitrogen and ammonia nitrogen are converted into nitrite nitrogen through short-range nitrification. Anaerobic ammonia-oxidizing bacteria use nitrite nitrogen as an electron acceptor to oxidize ammonia nitrogen into nitrogen gas. The second reactor cell is used to form anaerobic ammonia-oxidizing granular sludge by bottom aeration, further remove ammonia nitrogen in the wastewater, and has a built-in integrated mud and water separation device and a matching air lift sludge return device to return the sludge to the front end of the unit.

[0046] 4. Deep biochemical unit: mainly includes A / O tank 7 and deep biochemical sedimentation tank 8. Since the effluent of MBBR-PN / A unit 6 contains low-concentration nitrate nitrogen, in order to ensure that the effluent meets the discharge standards, A / O tank 7 is set to treat the remaining nitrate nitrogen in the wastewater, and low-concentration organic wastewater can be used to meet its carbon source needs; the effluent of A / O tank 7 enters the deep biochemical sedimentation tank for mud and water separation, and the sludge return ratio is controlled at 50-100%, and the supernatant enters the deep treatment unit 9.

[0047] 5. Advanced treatment unit 9: After the above biochemical treatment, the sewage is treated more thoroughly to further reduce the pollutant content and meet higher emission standards. This unit uses chlorine dioxide to disinfect the wastewater to remove pathogenic bacteria.

[0048] 6. Sludge treatment unit: The residual sludge produced by the above units enters the sludge pool 10 for adjustment, and then is dehydrated in the filter press dehydrator 11 to a water content of 65% to 70%, and then is subjected to anaerobic composting fermentation tower 12 to achieve deodorization, sterilization and humification. During the composting process, the pH is controlled at 6.0 to 8.5, the temperature is controlled at 50 to 60°C, and the C / N is controlled at 20:1 to 30:1. After drying, crushing, extrusion granulation, it can be made into organic compound fertilizer for agricultural production.

[0049] 7. Heat recovery system: including a wide-channel plate heat exchanger 15 and a heat dissipation platform 16 connected in sequence; wherein the wide-channel plate heat exchanger 15 is used to recover the heat energy in the bottom liquid of the high-temperature distillation tower, and the narrow channels between the plates are used to achieve heat exchange, and the operating pressure is controlled to be 3-5MPa; the heat dissipation platform 16 is used to transfer the recovered waste heat to other units, to the MBBR-PN / A unit in winter to ensure its optimal operating temperature of 30-35°C, and to the anaerobic composting fermentation tower in summer to reduce its high-temperature fermentation energy.

[0050] Embodiment 1:

[0051] The brewing wastewater to be treated and the water quality indicators of the effluent at different stages are shown in Table 1. The brewing wastewater is treated using the brewing wastewater anaerobic ammonia oxidation treatment system and method.

[0052] Table 1 Example 1 Brewing wastewater inlet and outlet water quality indicators

[0053]

[0054] In the anaerobic digestion unit, high-concentration organic wastewater enters the anaerobic reactor 3 for anaerobic digestion after passing through the regulating tank. The operating temperature is controlled at 32-36°C, the pH is 7.3-7.9, and the operating time is 15-35 days. Anaerobic microorganisms are used to decompose organic matter under anaerobic conditions, converting the organic matter in the wastewater into a large amount of CH 4 , CO 2 and a small amount of H 2 S and H 2 The crude biogas composed of O enters the biogas treatment unit for further purification and purification; the effluent from the anaerobic reactor 3 enters the anaerobic sedimentation tank 4 for mud-water separation, the sludge return ratio is controlled at 50-70%, and the supernatant enters the pretreatment unit.

[0055] In the biogas treatment unit, the raw biogas passes through the dehydration filter to remove part of the water, and then enters the atmospheric pressure cold dryer for further dehydration. The dehydrated biogas enters the dry fine desulfurization unit to reduce the H 2 S decreased to 10 mg / m 3 Then, the particles are removed by the filter. Then, in the biogas membrane separation device 14, the gas partial pressure difference on both sides of the membrane is used as the driving force, and the different permeation rates of the components in the mixed gas in the gas separation membrane are used to separate the components. After the primary membrane separation and the secondary membrane separation, CH 4 The recovery rate is above 95%, CO 2 The removal rate is above 99%.

[0056] The MBBR-PN / A unit 6 includes a first reactor cell and a second reactor cell connected in sequence. A certain amount of honeycomb suspended carriers suitable for the growth of anaerobic ammonia-oxidizing bacteria are added to the first reactor cell, which is completely mixed with the wastewater during aeration, which is conducive to their attachment and growth. At the same time, the shearing and collision of the suspended carriers in the water make the bubbles smaller, greatly increasing the oxygen transfer efficiency. Therefore, the required aeration volume is small. During operation, the dissolved oxygen concentration is controlled between 0.3 and 0.6 mg / L. Organic nitrogen and ammonia nitrogen are converted into nitrite nitrogen through short-range nitrification. The anaerobic ammonia-oxidizing bacteria use nitrite nitrogen as an electron acceptor to oxidize ammonia nitrogen into nitrogen gas. The second reactor cell is used to form anaerobic ammonia-oxidizing granular sludge by bottom aeration, further remove ammonia nitrogen in the wastewater, and has a built-in integrated mud and water separation device and a matching air lift sludge return device to return the sludge to the front end of the unit.

[0057] In the deep biochemical unit, an A / O tank 7 is set up to treat the remaining nitrate nitrogen in the wastewater to meet the effluent standard, and only low-concentration organic wastewater can be used to meet its carbon source demand; the effluent from the A / O tank 7 enters the deep biochemical sedimentation tank 8 for mud and water separation, and the sludge return ratio is controlled at 50-100%, and the supernatant enters the deep treatment unit 9.

[0058] In the deep treatment unit 9, the sewage is treated more thoroughly to further reduce the pollutant content and reach a higher emission standard. Chlorine dioxide is used to disinfect the wastewater to remove pathogenic bacteria therein.

[0059] In the sludge treatment unit, the excess sludge produced by the above units enters the sludge pool 10 for adjustment, and then is dehydrated in the filter press dehydrator 11 to a water content of 65% to 70%, and then is treated in the anaerobic composting fermentation tower 12, and the pH is controlled at 6.0 to 8.5, the temperature is 50 to 60°C, and the C / N is 20:1 to 30:1. After drying, crushing, extrusion granulation, it can be made into organic compound fertilizer for agricultural production.

[0060] In the heat recovery system, the wide-channel plate heat exchanger 15 is used to recover the heat energy in the high-temperature distillation tower bottom liquid, and the narrow channels between the plates are used to achieve heat exchange, and the operating pressure is controlled to be 3-5 MPa; the heat dissipation platform 16 is used to transfer the recovered waste heat to other units, to the MBBR-PN / A unit in winter to ensure its optimal operating temperature of 30-35°C, and to the anaerobic composting fermentation tower in summer to reduce its high-temperature fermentation energy.

[0061] Embodiment 2:

[0062] The brewing wastewater to be treated is different from that in Example 1, and various water quality indicators are increased. The brewing wastewater to be treated and the water quality indicators of the effluent at different stages are shown in Table 2. The brewing wastewater is treated using the same brewing wastewater anaerobic ammonia oxidation treatment system and method as in Example 1.

[0063] Table 2 Example 2 Brewing wastewater inlet and outlet water quality indicators

[0064]

[0065] Embodiment 3:

[0066] The high-temperature distillation tower bottom liquid in brewing wastewater has a high water temperature, often reaching 80°C. The heat energy contained therein can be used in subsequent processes. In different seasons, due to changes in ambient temperature, the way of utilizing heat energy is also different. In summer, the wastewater treated by the heat recovery system can maintain a temperature of 30-35°C to ensure the normal living environment of anaerobic ammonia-oxidizing bacteria. The recovered heat energy is transferred to the anaerobic composting fermentation tower through the heat dissipation platform; in winter, the temperature of untreated wastewater in northern regions is generally 8-12°C, which will seriously affect the activity of anaerobic ammonia-oxidizing bacteria. In this embodiment, while installing insulation materials on the biological denitrification reaction tank, the heat dissipation platform is connected to the MBBR-PN / A unit, and the outlet water temperature of the heat recovery system is appropriately increased to reduce the impact of the water temperature drop caused by the ambient temperature on the treatment effect.

[0067] It can be seen from Examples 1, 2 and 3 that the treatment system and method disclosed in the present invention can effectively treat pollutants such as organic matter and ammonia nitrogen in brewing wastewater to meet the effluent water quality standards when the water quality indicators of the brewing wastewater are high; when the influent water quality of the brewing wastewater changes, the good treatment effect can still be maintained; in summer and winter, when the ambient temperature changes significantly, the water temperature of the MBBR-PN / A unit can also be adjusted through the heat recovery system.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An anaerobic ammonium oxidation treatment system for brewing wastewater, characterized in that: The treatment system comprises an anaerobic digestion unit, an MBBR-PN / A unit, a deep biochemical unit and a deep treatment unit which are connected in sequence, wherein the anaerobic digestion unit is also connected to a biogas treatment unit, and the anaerobic digestion unit, the MBBR-PN / A unit and the deep biochemical unit are all connected to a sludge treatment unit; The anaerobic digestion unit is used to perform anaerobic digestion on wastewater, convert organic matter in the wastewater into raw biogas consisting of a large amount of CH4, CO2 and a small amount of H2S and H2O, and perform mud-water separation, and then transport the generated raw biogas to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit; The biogas processing unit is used to purify and refine the generated raw biogas; The MBBR-PN / A unit is used to denitrify wastewater; The deep biochemical unit is used to treat the remaining nitrate nitrogen in the wastewater and perform mud-water separation; The sludge treatment unit is used to sequentially regulate, dehydrate and treat the excess sludge produced by the treatment system in an anaerobic composting fermentation tower; The deep treatment unit is used to disinfect wastewater using chlorine dioxide to remove pathogenic bacteria and ensure that the effluent meets the discharge standard.

2. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 1, characterized in that: The anaerobic digestion unit includes an anaerobic reactor and an anaerobic sedimentation tank connected to each other; The anaerobic reactor is used to decompose organic matter under anaerobic conditions using anaerobic microorganisms, including four stages of hydrolysis, acidification, acid production and methanogenesis, to convert organic matter in wastewater into crude biogas composed of a large amount of CH4, CO2 and a small amount of H2S and H2O; the anaerobic sedimentation tank is used to separate the effluent from the anaerobic reactor into mud and water, and to transport the supernatant produced by the separation to the MBBR-PN / A unit.

3. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 2, characterized in that: The pretreatment unit includes a high-concentration regulating tank and a low-concentration regulating tank; Among them, the high-concentration regulating tank is arranged before the anaerobic reactor, and is used to regulate the water quality and water quantity of high-concentration organic wastewater; the low-concentration regulating tank is arranged before the deep biochemical unit, and is used to regulate the water quality and water quantity of low-concentration organic wastewater.

4. The anaerobic ammonium oxidation treatment system for brewing wastewater according to claim 3, characterized in that: The deep biochemical unit includes an A / O tank and a deep biochemical sedimentation tank; The A / O tank is used to use low-concentration organic wastewater as a carbon source to treat the remaining nitrate nitrogen in the wastewater; the deep biochemical sedimentation tank is used to separate the effluent from the A / O tank into mud and water, and transport the resulting supernatant to the deep treatment unit; The treatment system further comprises a blower for aerating the MBBR-PN / A unit and the deep biological unit.

5. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 1, characterized in that: The biogas processing unit includes a biogas dehydration and desulfurization tank and a biogas membrane separation device; Among them, the biogas dehydration and desulfurization tank is used to dehydrate, desulfurize and filter and remove particulate matter from the raw biogas in sequence; the biogas membrane separation device is used to use the gas partial pressure difference on both sides of the membrane as the driving force, and utilize the different permeation rates of each component in the mixed gas in the gas separation membrane to achieve separation of each component, and after primary membrane separation and secondary membrane separation, CH4 purification and CO2 removal are achieved.

6. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 1, characterized in that: The MBBR-PN / A unit comprises a first reactor cell and a second reactor cell connected in sequence, wherein a honeycomb suspension carrier is added into the first reactor cell, and anaerobic ammonia-oxidizing bacteria are attached to the honeycomb suspension carrier, and the honeycomb suspension carrier is used for shearing and colliding in water to miniaturize bubbles, thereby increasing oxygen transfer efficiency and reducing aeration volume; during operation, the dissolved oxygen concentration is controlled between 0.3 and 0.6 mg / L, and organic nitrogen and ammonia nitrogen are converted into nitrite nitrogen through short-range nitrification, and the anaerobic ammonia-oxidizing bacteria use nitrite nitrogen as an electron acceptor to oxidize ammonia nitrogen into nitrogen gas; the second reactor cell is used to form anaerobic ammonia-oxidizing granular sludge by bottom aeration, further remove ammonia nitrogen in wastewater, and has a built-in integrated mud-water separation device, and a matching air lift sludge return device, so that the sludge returns to the front end of the unit.

7. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 1, characterized in that: The sludge treatment unit comprises a sludge pool, a filter press dewatering machine and an anaerobic composting fermentation tower which are connected in sequence; The sludge pool is used to regulate the residual sludge generated by the treatment system; the filter press dewatering machine is used to dehydrate the regulated sludge to a water content of 65% to 70%; the anaerobic composting fermentation tower is used to deodorize, sterilize and humify the dehydrated sludge, and the pH is controlled at 6.0 to 8.5, the temperature at 50°C to 60°C, and the C / N ratio at 20:1 to 30:1 during the composting process.

8. The anaerobic ammonium oxidation treatment system for brewery wastewater according to claim 1, characterized in that: The heat recovery unit comprises a wide-channel plate heat exchanger and a heat dissipation platform connected in sequence; Among them, the wide-channel plate heat exchanger is used to recover the heat energy in the bottom liquid of the high-temperature distillation tower, and the narrow channels between the plates are used to realize heat exchange, and the operating pressure is controlled to be 3-5MPa; the heat dissipation platform is used to transfer the recovered waste heat to other units; in winter, it is transferred to the MBBR-PN / A unit to ensure its optimal operating temperature of 30-35°C, and in summer, it is transferred to the anaerobic composting fermentation tower to reduce its high-temperature fermentation energy.

9. The anaerobic digestion unit performs anaerobic digestion on the wastewater entering the treatment system, converts the organic matter in the wastewater into raw biogas consisting of a large amount of CH4, CO2 and a small amount of H2S and H2O, and performs mud and water separation, and then transports the generated raw biogas to the biogas treatment unit, and the treated wastewater is transported to the MBBR-PN / A unit; The biogas processing unit purifies and refines the generated raw biogas; The MBBR-PN / A unit denitrifies the wastewater and removes most of the ammonia nitrogen; The deep biochemical unit treats the remaining nitrate nitrogen in the wastewater and performs mud-water separation; The sludge treatment unit sequentially regulates, dehydrates and processes the excess sludge produced by the treatment system in an anaerobic composting and fermentation tower; The deep treatment unit uses chlorine dioxide to disinfect the wastewater to remove pathogenic bacteria and ensure that the effluent meets the discharge standards.

10. The method for treating brewery wastewater by anaerobic ammonia oxidation according to claim 9, characterized in that: The treatment method also includes: after the anaerobic composting fermentation tower, the sludge is dried, crushed, and extruded into granules to prepare organic compound fertilizer for agricultural production.

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