Landfill leachate purification treatment and hydrogen production equipment

Abstract

The utility model discloses landfill leachate purification treatment and hydrogen production equipment which can be used for electrolytic hydrogen production by utilizing landfill leachate. Comprising a pretreatment system used for pretreating the landfill leachate, so that the pretreated wastewater reaches the inlet water quality of a subsequent biochemical treatment system; the biochemical treatment system is used for carrying out biochemical treatment on the pretreated wastewater, so that the wastewater subjected to biochemical treatment reaches the inlet water quality of the subsequent wastewater purification coupling electrolytic hydrogen production system; and the wastewater purification coupling electrolytic hydrogen production system is used for carrying out electrocatalytic oxidation coupling hydrogen production on the wastewater subjected to biochemical treatment and outputting the wastewater subjected to electrocatalytic oxidation purification. The wastewater purification coupling electrolytic hydrogen production system is arranged behind the biochemical treatment system, and the wastewater purification coupling electrolytic hydrogen production system is used for carrying out electrocatalytic oxidation coupling hydrogen production on the wastewater subjected to biochemical treatment, so that the wastewater subjected to biochemical treatment can be further purified, and meanwhile, electrolytic hydrogen production can be realized.

Description

Technical Field

[0001] The utility model relates to garbage leachate purification and hydrogen production equipment and a biological nitrogen and phosphorus removal system. Background Art

[0002] Wastewater treatment methods mainly include physical and chemical methods and biochemical methods (biochemical methods). Among them, physical and chemical methods mainly include adsorption, chemical precipitation, chemical oxidation, ion exchange, electrochemical reaction (electrolysis), membrane treatment, etc. At present, the treatment of landfill leachate mainly adopts a process that combines physical and chemical pretreatment with biochemical denitrification and phosphorus removal. With the development of the hydrogen energy industry, the demand for hydrogen is increasing, but there is no idea of ​​purifying landfill leachate by electrolysis while producing hydrogen by electrolysis.

[0003] The electrochemical reactors currently available for wastewater treatment are mainly electrocatalytic oxidation (ECO) reactors and electrocoagulation (EC) reactors. Their basic structures are similar, that is, they both contain an electrolysis device and a DC power supply, and the anode and cathode of the electrolysis device are connected to the positive and negative electrodes of the DC power supply respectively. The main difference between the two is the difference in electrode materials.

[0004] Electro-Catalytic Oxidation (EO) is a process that utilizes the oxidation of the anode (usually a titanium-based metal oxide coated electrode) and / or the electric field to generate free radicals to promote the oxidation and decomposition of pollutants, thereby achieving wastewater treatment. It can be divided into direct oxidation and indirect oxidation. The direct oxidation method is to directly oxidize pollutants on the surface of the anode to achieve the purpose of removing pollution. The indirect oxidation method is to decompose water molecules through an electric field to produce oxidants such as hydroxyl radicals, which react with pollutants in the wastewater to remove pollution.

[0005] Electro-coagulation (EC) is a process in which metal ions in the anode (usually aluminum or iron electrodes) are dissolved in wastewater, and metal hydroxides are generated through hydrolysis reaction. Metal hydroxides act as flocculants to condense suspended solids and colloids in wastewater, thereby achieving the purpose of removing pollution. At the same time, hydrogen ions in the cathode are reduced to hydrogen after receiving electrons, and overflow in the form of fine bubbles, and floccules and oily substances in the wastewater float to the surface of the water through flotation.

[0006] At present, the functions of electrocatalytic oxidation technology and electrocoagulation technology are relatively simple and have not yet achieved the recovery and utilization of hydrogen.

[0007] In addition, in the existing biochemical denitrification and phosphorus removal process, the AAO process (anaerobic-anoxic-aerobic treatment process) is a commonly used process. The corresponding equipment of this process includes an anaerobic reactor, an anoxic reactor, an aerobic reactor and a sludge sedimentation tank connected in series in the order of water treatment. A sludge return channel for returning the activated sludge in the sedimentation tank to the anaerobic reactor is connected between the anaerobic reactor and the sedimentation tank, and a mixed liquid return channel for returning the mixed liquid in the aerobic reactor to the anoxic reactor is connected between the anoxic reactor and the aerobic reactor. In the above-mentioned AAO process, the main function of the anaerobic reactor is to release phosphorus, ammoniation and denitrification of some organic matter; the main function of the anoxic reactor is denitrification; the main function of the aerobic tank is oxidation removal of BOD, nitrification and aerobic phosphorus removal.

[0008] In the prior art, there is also an improved AAO process that combines the above-mentioned AAO process with the anaerobic ammonium oxidation method (Anammox technology) (refer to the patent document with publication number CN111908735A). The improved AAO process mainly adds anaerobic ammonium oxidizing bacteria to the above-mentioned anoxic reactor, so that the anoxic reactor can perform anaerobic ammonium oxidation denitrification, thereby improving the denitrification performance. The inventor noted that if the effluent of the above-mentioned improved AAO process is used for electrolytic hydrogen production, the effluent quality can be further improved by further improving the above-mentioned improved AAO process. Utility Model Content

[0009] One of the purposes of the utility model is to provide a garbage leachate purification and hydrogen production equipment, which can utilize garbage leachate to produce hydrogen through electrolysis.

[0010] The second purpose of the utility model is to provide a biological denitrification and phosphorus removal system, so as to further improve the above-mentioned improved AAO process to improve the effluent water quality.

[0011] In the first aspect, a landfill leachate purification and hydrogen production equipment is provided, including: a pretreatment system for pretreating the landfill leachate so that the pretreated wastewater reaches the inlet water quality of a subsequent biochemical treatment system; a biochemical treatment system for biochemically treating the pretreated wastewater so that the biochemically treated wastewater reaches the inlet water quality of a subsequent wastewater purification coupled electrolytic hydrogen production system; a wastewater purification coupled electrolytic hydrogen production system for electrocatalytically oxidizing and coupling hydrogen production to the biochemically treated wastewater and outputting the electrocatalytically oxidized purified wastewater.

[0012] Furthermore, the biochemical treatment system includes an anaerobic reactor, a first anoxic reactor, a first aerobic reactor, a second anoxic reactor, a second aerobic reactor and a sludge sedimentation tank which are connected in series in the order of water treatment. A sludge return channel for returning the activated sludge in the sludge sedimentation tank to the anaerobic reactor is connected between the anaerobic reactor and the sedimentation tank. A mixed liquid return channel for returning the mixed liquid in the first aerobic reactor to the first anoxic reactor is connected between the first anoxic reactor and the first aerobic reactor. The anaerobic reactor is configured as an anaerobic reactor capable of releasing phosphorus, ammoniation of part of organic matter and denitrification. The first anoxic reactor and the second anoxic reactor are both configured as anoxic reactors capable of anaerobic ammonia oxidation denitrification, denitrification denitrification and denitrification phosphorus removal. The first aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal, oxidative BOD removal and nitrification. The second aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal.

[0013] Furthermore, it comprises a sludge concentrator, which is arranged after the sludge sedimentation tank and is used for solid-liquid separation of the sludge discharged from the sludge sedimentation tank.

[0014] Furthermore, the wastewater purification coupled electrolysis hydrogen production system includes: a first device for preparing water to be electrolyzed, the input end of the first device for preparing water to be electrolyzed is connected to the drain outlet of the sludge sedimentation tank and the output end is connected to the first electrolysis hydrogen production device, and is used to adjust the wastewater obtained from the drain outlet of the sludge sedimentation tank to the first water to be electrolyzed; a first electrolysis hydrogen production device, the first electrolysis hydrogen production device is used to perform electrocatalytic oxidation coupled hydrogen production on the first water to be electrolyzed, and output the electrocatalytically oxidized purified wastewater; a second device for preparing water to be electrolyzed, the input end of the second device for preparing water to be electrolyzed is connected to the first electrolysis hydrogen production device and the output end is connected to the second electrolysis hydrogen production device, and is used to adjust the electrocatalytically oxidized purified wastewater to the second water to be electrolyzed; a second electrolysis hydrogen production device, the second electrolysis hydrogen production device is used to perform alkaline water electrolysis hydrogen production, PEM water electrolysis hydrogen production or brine electrolysis hydrogen production on the second water to be electrolyzed.

[0015] Furthermore, the second electrolysis hydrogen production device includes a plurality of independent second electrolysis hydrogen production modules, and the second device for preparing water to be electrolyzed includes a water storage device capable of providing second water to be electrolyzed to each of the plurality of second electrolysis hydrogen production modules.

[0016] Furthermore, the first electrolysis hydrogen production device is a 100kW-class electrolysis hydrogen production device or a MW-class electrolysis hydrogen production device, and the power of each second electrolysis hydrogen production module in the multiple second electrolysis hydrogen production modules is one order of magnitude lower than that of the first electrolysis hydrogen production device and adopts a 10kW-class electrolyzer or a 100kW-class electrolyzer respectively.

[0017] Furthermore, the first water to be electrolyzed preparation device is used to temporarily store the wastewater obtained from the drainage outlet of the sludge sedimentation tank and then directly transport the first water to be electrolyzed to the first electrolytic hydrogen production device.

[0018] Furthermore, the first device for preparing water to be electrolyzed and / or the second device for preparing water to be electrolyzed respectively constitute a movable skid-mounted structure; a water treatment module configuration area, a water storage module configuration area and a water pumping module configuration area are provided in the movable skid-mounted structure, and the water treatment module configuration area is configured and installed with all or part of the water treatment modules selected from a plurality of different water treatment modules, the water storage module configuration area is configured and installed with an input side water storage device and an output side water storage device which are connected one-to-one with each water treatment module installed in the water treatment module configuration area, and the water pumping module configuration area is configured and installed with water pumping modules which are corresponding one-to-one with each water treatment module installed in the water treatment module configuration area, and each water pumping module is used to drive the water in the input side water storage device connected to the corresponding water treatment module to pass through the corresponding water treatment module and then enter the output side water storage device connected to the corresponding water treatment module.

[0019] Furthermore, the second device for preparing water to be electrolyzed comprises a cascade reverse osmosis membrane filtration device, a continuous electrolysis desalination device, and an ion exchange desalination device using a polishing resin, which are arranged in sequence.

[0020] The above-mentioned landfill leachate purification and hydrogen production equipment is equipped with a wastewater purification coupled electrolytic hydrogen production system after the biochemical treatment system. The wastewater purification coupled electrolytic hydrogen production system can further purify the wastewater after biochemical treatment and produce hydrogen by electrocatalytic oxidation coupled with hydrogen production.

[0021] According to a second aspect, a biological denitrification and phosphorus removal system is provided, comprising an anaerobic reactor, a first anoxic reactor, a first aerobic reactor, a second anoxic reactor, a second aerobic reactor and a sludge sedimentation tank which are connected in series in the order of water treatment, a sludge return channel for returning activated sludge in the sludge sedimentation tank to the anaerobic reactor is connected between the anaerobic reactor and the sedimentation tank, a mixed liquid return channel for returning mixed liquid in the first aerobic reactor to the first anoxic reactor is connected between the first anoxic reactor and the first aerobic reactor, the anaerobic reactor is configured as an anaerobic reactor capable of releasing phosphorus, ammoniation of part of organic matter and denitrification, the first anoxic reactor and the second anoxic reactor are both configured as anoxic reactors capable of anaerobic ammonia oxidation denitrification, denitrification denitrification and denitrification phosphorus removal, the first aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal, oxidative BOD removal and nitrification, and the second aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal.

[0022] Furthermore, the biological denitrification and phosphorus removal system includes a wastewater pretreatment system, which is arranged before the anaerobic reactor and is used to pretreat the wastewater so that the inlet water quality of the anaerobic reactor reaches the required conditions.

[0023] Furthermore, the biological denitrification and phosphorus removal system includes a sludge concentrator, which is arranged after the sludge sedimentation tank and is used for solid-liquid separation of the sludge discharged from the sludge sedimentation tank.

[0024] Furthermore, the drain outlet of the sludge sedimentation tank is connected to a wastewater purification coupled electrolysis hydrogen production system, which is used to perform electrocatalytic oxidation coupled hydrogen production on the wastewater discharged from the sludge sedimentation tank and output the electrocatalytically oxidized purified wastewater.

[0025] Furthermore, the wastewater purification coupled electrolysis hydrogen production system includes: a first device for preparing water to be electrolyzed, the input end of the first device for preparing water to be electrolyzed is connected to the drain outlet of the sludge sedimentation tank and the output end is connected to the first electrolysis hydrogen production device, and is used to adjust the wastewater obtained from the drain outlet of the sludge sedimentation tank to the first water to be electrolyzed; a first electrolysis hydrogen production device, the first electrolysis hydrogen production device is used to perform electrocatalytic oxidation coupled hydrogen production on the first water to be electrolyzed, and output the electrocatalytically oxidized purified wastewater; a second device for preparing water to be electrolyzed, the input end of the second device for preparing water to be electrolyzed is connected to the first electrolysis hydrogen production device and the output end is connected to the second electrolysis hydrogen production device, and is used to adjust the electrocatalytically oxidized purified wastewater to the second water to be electrolyzed; a second electrolysis hydrogen production device, the second electrolysis hydrogen production device is used to perform alkaline water electrolysis hydrogen production, PEM water electrolysis hydrogen production or brine electrolysis hydrogen production on the second water to be electrolyzed.

[0026] Furthermore, the second electrolysis hydrogen production device includes a plurality of independent second electrolysis hydrogen production modules, and the second device for preparing water to be electrolyzed includes a water storage device capable of providing second water to be electrolyzed to each of the plurality of second electrolysis hydrogen production modules.

[0027] Furthermore, the first electrolysis hydrogen production device is a 100kW-class electrolysis hydrogen production device or a MW-class electrolysis hydrogen production device, and the power of each second electrolysis hydrogen production module in the multiple second electrolysis hydrogen production modules is one order of magnitude lower than that of the first electrolysis hydrogen production device and adopts a 10kW-class electrolyzer or a 100kW-class electrolyzer respectively.

[0028] Furthermore, the first water to be electrolyzed preparation device is used to temporarily store the wastewater obtained from the drainage outlet of the sludge sedimentation tank and then directly transport the first water to be electrolyzed to the first electrolytic hydrogen production device.

[0029] Furthermore, the first device for preparing water to be electrolyzed and / or the second device for preparing water to be electrolyzed respectively constitute a movable skid-mounted structure; a water treatment module configuration area, a water storage module configuration area and a water pumping module configuration area are provided in the movable skid-mounted structure, and the water treatment module configuration area is configured and installed with all or part of the water treatment modules selected from a plurality of different water treatment modules, the water storage module configuration area is configured and installed with an input side water storage device and an output side water storage device which are connected one-to-one with each water treatment module installed in the water treatment module configuration area, and the water pumping module configuration area is configured and installed with water pumping modules which are corresponding one-to-one with each water treatment module installed in the water treatment module configuration area, and each water pumping module is used to drive the water in the input side water storage device connected to the corresponding water treatment module to pass through the corresponding water treatment module and then enter the output side water storage device connected to the corresponding water treatment module.

[0030] Furthermore, the second device for preparing water to be electrolyzed comprises a cascade reverse osmosis membrane filtration device, a continuous electrolysis desalination device, and an ion exchange desalination device using a polishing resin, which are arranged in sequence.

[0031] The above-mentioned biological denitrification and phosphorus removal system, based on the improved AAO process mentioned in the background technology, adds a second anoxic reactor and a second aerobic reactor. The second anoxic reactor is configured as an anoxic reactor capable of anaerobic ammonia oxidation denitrification, denitrification and denitrification phosphorus removal, and the second aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal. In this way, the denitrification, phosphorus removal and BOD removal effects of the biological denitrification and phosphorus removal system are further improved.

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of this specification are used to assist the understanding of the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0034] Figure 1 This is a schematic diagram of a garbage leachate purification and hydrogen production equipment according to an embodiment of the utility model.

[0035] Figure 2 This is a schematic diagram of a biological nitrogen and phosphorus removal system according to an embodiment of the utility model.

[0036] Figure 3 This is a structural schematic diagram of a wastewater purification coupled electrolysis hydrogen production system according to an embodiment of the utility model.

[0037] Figure 4 for Figure 3 Schematic diagram of the structure of the second device for preparing water to be electrolyzed.

[0038] Figure 5 for Figure 3 Schematic diagram of the structure of the second device for preparing water to be electrolyzed. DETAILED DESCRIPTION

[0039] The utility model is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly noted that:

[0040] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0041] The embodiments of the utility model involved in the following description are usually only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0042] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0043] Figure 1 This is a schematic diagram of a garbage leachate purification and hydrogen production equipment according to an embodiment of the utility model. Figure 1 As shown, the garbage leachate purification and hydrogen production equipment includes: a pretreatment system 11, a biochemical treatment system 12 and a wastewater purification coupled electrolysis hydrogen production system 13.

[0044] The pretreatment system 11 is used to pretreat the landfill leachate so that the pretreated wastewater reaches the inlet water quality of the subsequent biochemical treatment system.

[0045] Specifically, in this embodiment, the pretreatment system 11 includes a regulating tank 111 and a coagulation sedimentation reactor 112. The regulating tank 111 plays the role of connecting, buffering, homogenizing and regulating the landfill leachate to meet the water inlet requirements (pH value, temperature, etc.) of the coagulation sedimentation reactor 112. It is an existing technology to treat landfill leachate by coagulation sedimentation reactor 112.

[0046] The biochemical treatment system 12 is used to perform biochemical treatment on the pretreated wastewater, so that the biochemically treated wastewater reaches the inlet water quality of the subsequent wastewater purification coupled electrolytic hydrogen production system 13.

[0047] Figure 2 This is a schematic diagram of a biological nitrogen removal and phosphorus removal system according to an embodiment of the utility model. Figure 2 As shown, the biochemical treatment system 12 adopts Figure 2 The biological nitrogen and phosphorus removal system shown.

[0048] Specifically, the biochemical treatment system 12 includes an anaerobic reactor 121, a first anoxic reactor 122, a first aerobic reactor 123, a second anoxic reactor 124, a second aerobic reactor 125 and a sludge sedimentation tank 126 which are connected in series in the order of water treatment. A sludge return channel for returning the activated sludge in the sludge sedimentation tank 126 to the anaerobic reactor 121 is connected between the anaerobic reactor 121 and the sludge sedimentation tank 126. A sludge return channel for returning the activated sludge in the sludge sedimentation tank 126 to the anaerobic reactor 121 is connected between the first anoxic reactor 122 and the first aerobic reactor 123. The mixed liquid in 23 returns to the mixed liquid reflux channel of the first anoxic reactor 122, the anaerobic reactor 121 is configured as an anaerobic reactor capable of releasing phosphorus, ammoniation of part of organic matter and denitrification, the first anoxic reactor 122 and the second anoxic reactor 124 are both configured as anoxic reactors capable of anaerobic ammonia oxidation denitrification, denitrification denitrification and denitrification phosphorus removal, the first aerobic reactor 123 is configured as an aerobic reactor capable of aerobic phosphorus removal, oxidative BOD removal and nitrification, and the second aerobic reactor 125 is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal.

[0049] The above-mentioned biochemical treatment system 12 (biological denitrification and phosphorus removal system) is based on the improved AAO process mentioned in the background technology, and further adds a second anoxic reactor 124 and a second aerobic reactor 125. The second anoxic reactor 124 is configured as an anoxic reactor capable of anaerobic ammonia oxidation denitrification, denitrification and denitrification phosphorus removal, and the second aerobic reactor 125 is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal. In this way, the denitrification, phosphorus removal and BOD removal effects of the biological denitrification and phosphorus removal system are further improved. More specifically: the improved AAO process combines anaerobic-anoxic-aerobic (AAO) with anaerobic ammonium oxidation (Anammox technology), specifically in the present application, by adding anaerobic ammonium oxidizing bacteria to the first anoxic reactor 122, the first anoxic reactor 122 can perform anaerobic ammonium oxidation denitrification, thereby improving the denitrification performance; since the second anoxic reactor 124 is added, the second anoxic reactor 124 is configured as an anoxic reactor capable of anaerobic ammonium oxidation denitrification, denitrification denitrification and denitrification phosphorus removal. At this time, it is equivalent to setting the original single anoxic reactor in the improved AAO process to two, thereby improving the anaerobic ammonium oxidation denitrification effect; and after the second anoxic reactor 124, a second aerobic reactor 125 is added, and the second aerobic reactor 125 is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidation BOD removal, further removing organic matter and phosphorus. Since the effluent quality of the biochemical treatment system 12 (biological denitrification and phosphorus removal system) is higher, it is more conducive to the operation of the wastewater purification coupled electrolytic hydrogen production system 13.

[0050] The wastewater purification coupled electrolysis hydrogen production system 13 is used to perform electrocatalytic oxidation coupled hydrogen production on the wastewater after biological denitrification and phosphorus removal treatment, and output the electrocatalytically oxidized purified wastewater.

[0051] The biochemical treatment system 12 (biological denitrification and phosphorus removal system) further includes a sludge concentrator 127, which is arranged after the sludge sedimentation tank 126 and is used to perform solid-liquid separation on the sludge discharged from the sludge sedimentation tank 126. The supernatant after solid-liquid separation can flow back to the regulating tank 128 at the entrance of the biochemical treatment system 12.

[0052] The wastewater purification coupled electrolytic hydrogen production system 13 comprises: a first device for preparing water to be electrolyzed 131 , a first electrolytic hydrogen production device 132 , a second device for preparing water to be electrolyzed 133 , and a second electrolytic hydrogen production device 134 .

[0053] The input end of the first water preparation device 131 is connected to the drain outlet of the sludge sedimentation tank 126 and the output end is connected to the first electrolysis hydrogen production device 132, which is used to adjust the wastewater obtained from the drain outlet of the sludge sedimentation tank 126 into the first water to be electrolyzed.

[0054] The first electrolytic hydrogen production device 132 is used to perform electrocatalytic oxidation coupled hydrogen production on the first water to be electrolyzed, and output electrocatalytically oxidized purified wastewater.

[0055] The input end of the second water preparation device 133 is connected to the first electrolytic hydrogen production device 132 and the output end is connected to the second electrolytic hydrogen production device 134, and is used to adjust the electrocatalytically oxidized purified wastewater into second water to be electrolyzed.

[0056] The second electrolysis hydrogen production device 134 is used to produce hydrogen by alkaline water electrolysis, PEM water electrolysis or brine electrolysis on the second water to be electrolyzed.

[0057] Among them, the electrocatalytic oxidation coupled hydrogen production means that the first electrolytic hydrogen production device 132 uses the oxidation of the anode (usually a titanium-based metal oxide coating electrode) and / or uses the electric field to generate free radicals to promote the oxidation and decomposition of pollutants, thereby achieving wastewater treatment. At the same time, the first electrolytic hydrogen production device 132 uses the cathode to generate hydrogen and recycle it. The above-mentioned biochemical treatment system 12 (biological denitrification and phosphorus removal system) can meet the water quality requirements of the first electrolytic hydrogen production device 132 for the first water to be electrolyzed.

[0058] The alkaline water electrolysis hydrogen production and PEM water electrolysis hydrogen production are both conventional water electrolysis hydrogen production technologies. The second water to be electrolyzed entering the second electrolysis hydrogen production device 134 in the brine electrolysis hydrogen production is brine, rather than the alkaline water required for alkaline water electrolysis hydrogen production and the pure water required for PEM water electrolysis hydrogen production.

[0059] Since the raw material entering the first electrolyzed water preparation device 131 is the wastewater output by the above-mentioned biochemical treatment system 12 (biological denitrification and phosphorus removal system), the first electrolyzed water preparation device 131 no longer needs to perform complex and large-scale wastewater pretreatment, and only needs simple adjustments such as temporary storage.

[0060] Since the first electrolysis hydrogen production device 132 can perform electrocatalytic oxidation treatment on the first water to be electrolyzed, the electrocatalytic oxidation treatment can effectively remove residual pollutants (such as organic matter and salt) in the water. Therefore, it helps to simplify the structure and function of the second electrolysis water preparation device 133 so that the second water to be electrolyzed meets the water quality requirements for hydrogen production by alkaline water electrolysis, PEM water electrolysis or brine electrolysis.

[0061] In addition, hydrogen production is increased by jointly producing hydrogen through the first electrolytic hydrogen production device 132 and the second electrolytic hydrogen production device 134 .

[0062] In an optional implementation manner, the first electrolytic hydrogen production device specifically includes: a first electrocatalytic oxidation coupled hydrogen production device 132a and a second electrocatalytic oxidation coupled hydrogen production device 132b.

[0063] Among them, the first electrocatalytic oxidation coupled hydrogen production device 132a is used to perform the first electrocatalytic oxidation coupled hydrogen production on the first water to be electrolyzed and output the first electrocatalytically oxidized purified wastewater. The anode electrochemical reaction of the first electrocatalytic oxidation coupled hydrogen production is mainly used to remove organic matter and ammonia nitrogen in water.

[0064] The second electrocatalytic oxidation coupled hydrogen production device 132b is used to perform a second electrocatalytic oxidation coupled hydrogen production on the first electrocatalytically oxidized purified wastewater and output second electrocatalytically oxidized purified wastewater. The anode electrochemical reaction of the second electrocatalytic oxidation coupled hydrogen production is mainly used for desalination.

[0065] The second electrocatalytically oxidized purified wastewater is the electrocatalytically oxidized purified wastewater outputted from the first electrolytic hydrogen production device.

[0066] Furthermore, the first electrolytic hydrogen production device may also include: a first electrocatalytically oxidized purified wastewater adjustment device 132c, the input end of the first electrocatalytically oxidized purified wastewater adjustment device 132c is connected to the first electrocatalytically oxidized coupled hydrogen production device and the output end is connected to the second electrocatalytically oxidized coupled hydrogen production device, and is used to adjust the first electrocatalytically oxidized purified wastewater output by the first electrocatalytically oxidized coupled hydrogen production device to the first electrocatalytically oxidized purified wastewater that meets the water inlet requirements of the second electrocatalytically oxidized coupled hydrogen production device.

[0067] The first electrolytic hydrogen production device is divided into a first electrocatalytic oxidation coupled hydrogen production device 132a and a second electrocatalytic oxidation coupled hydrogen production device 132b, so that different types of pollutants in the wastewater can be removed step by step, thereby improving the wastewater treatment efficiency.

[0068] The first electrocatalytic oxidation coupled hydrogen production device 132a mainly removes organic matter and ammonia nitrogen in the wastewater. Organic matter and ammonia nitrogen are the main pollutants in the wastewater and need to be removed first. Through the anode electrochemical reaction of the first electrocatalytic oxidation coupled hydrogen production device 132a, the organic matter in the wastewater can be oxidized and decomposed, and the ammonia nitrogen can be converted into nitrogen. At the same time, hydrogen is generated at the cathode, realizing the coupling of pollutant removal and hydrogen production.

[0069] The second electrocatalytic oxidation coupled hydrogen production device 132b is mainly used for desalination. After being treated by the first electrocatalytic oxidation coupled hydrogen production device 132a, most of the organic matter and ammonia nitrogen in the wastewater have been removed, and the remaining main pollutants are salts. Through the anode electrochemical reaction of the second electrocatalytic oxidation coupled hydrogen production device 132b, the salt in the wastewater can be removed, further improving the quality of wastewater treatment, while continuing to produce hydrogen at the cathode.

[0070] The first electrocatalytically oxidized purified wastewater adjustment device 132c is provided to ensure that the inlet water quality of the second electrocatalytically oxidized coupled hydrogen production device 132b meets the requirements. Different electrocatalytically oxidized coupled hydrogen production devices have different requirements for the inlet water quality. By making necessary adjustments to the first electrocatalytically oxidized purified wastewater through the adjustment device 132c (for example, adding chloride salts to generate highly oxidizing hypochlorite during electrolysis), the effect of subsequent treatment can be ensured.

[0071] Furthermore, the second electrolysis hydrogen production device 134 includes a plurality of independent second electrolysis hydrogen production modules 134a, and the second device for preparing water to be electrolyzed 133 includes a water storage device capable of providing second water to be electrolyzed to each of the plurality of second electrolysis hydrogen production modules 134a.

[0072] When the green electricity production system provides the wastewater purification coupled electrolysis hydrogen production system through the green electricity transmission network to a peak stage, the first electrolysis hydrogen production device 132 and each of the multiple second electrolysis hydrogen production modules 134a are all in operation.

[0073] When the green electricity production system provides the wastewater purification coupled electrolysis hydrogen production system through the green electricity transmission network to a trough stage, the first electrolysis hydrogen production device 132 stops operating, and the multiple second electrolysis hydrogen production modules 134a operate in whole or in part according to the green electricity supply situation.

[0074] In this way, the peak and valley characteristics of green electricity can be fully utilized to improve the operating efficiency and economy of the system.

[0075] First, by setting up a plurality of independent second electrolytic hydrogen production modules 134a, the number of operating modules can be flexibly adjusted according to the supply of green electricity, thereby avoiding the problem of low operating efficiency of high-power electrolytic hydrogen production equipment during the trough phase of green electricity.

[0076] Second, during the peak period of green electricity, the supply of green electricity is sufficient. At this time, all the first electrolytic hydrogen production devices 132 and all the second electrolytic hydrogen production modules 134a are operated, so that green electricity can be used to the maximum extent for hydrogen production and wastewater treatment.

[0077] Third, during the trough phase of green electricity, the supply of green electricity is relatively insufficient. At this time, the first electrolysis hydrogen production device 132 is stopped, and only part or all of the second electrolysis hydrogen production module 134a is operated according to the supply of green electricity. This can ensure the hydrogen production and wastewater treatment tasks while avoiding energy waste caused by insufficient green electricity.

[0078] Fourthly, a water storage device is provided in the second device for preparing water to be electrolyzed 133, which can store more water to be electrolyzed when the green electricity is sufficient, and continue to supply the water to the second electrolysis hydrogen production module 134a when the green electricity is insufficient, so as to ensure the continuity and stability of its operation.

[0079] In an optional embodiment, the first electrolysis hydrogen production device is a 100kW-class electrolysis hydrogen production device or a MW-class electrolysis hydrogen production device, and the power of each second electrolysis hydrogen production module in the multiple second electrolysis hydrogen production modules is one order of magnitude lower than that of the first electrolysis hydrogen production device and adopts a 10kW-class electrolyzer or a 100kW-class electrolyzer respectively.

[0080] The first electrolysis hydrogen production device adopts a relatively large power (100kW or MW level), which can quickly process a large amount of wastewater and produce hydrogen during the peak period of green electricity, making full use of the surplus power of green electricity and improving the efficiency of hydrogen production.

[0081] The second electrolytic hydrogen production module uses a smaller power (10kW or 100kW), and can flexibly adjust the number of modules in operation according to the power supply during the green electricity valley stage. When green electricity is insufficient, only some modules can be operated, avoiding the problem of low efficiency of high-power devices under low load, and also reducing energy waste.

[0082] The power of the second electrolysis hydrogen production module is one order of magnitude lower than that of the first electrolysis hydrogen production device, which means that the second electrolysis hydrogen production device contains multiple second electrolysis hydrogen production modules. This design can achieve more refined regulation. For example, when green electricity is slightly insufficient, one or two second electrolysis hydrogen production modules can be stopped; when green electricity is seriously insufficient, only a minimum number of second electrolysis hydrogen production modules can be kept running. This flexibility helps to ensure the continuity and stability of the system in the event of green electricity fluctuations.

[0083] In summary, electrolyzers of different grades differ in manufacturing cost, operating efficiency, and maintenance difficulty. The unit hydrogen production cost of 100kW and MW electrolyzers is usually lower than that of 10kW electrolyzers, but 10kW electrolyzers are more flexible. Combining the two grades of electrolyzers can achieve a balance between economy and flexibility.

[0084] Figure 4 for Figure 3 Schematic diagram of the structure of the second device for preparing water to be electrolyzed. Figure 5 for Figure 3 The schematic diagram of the structure of the second electrolyzed water preparation device. Figure 4-Figure 5 As shown, the first device for preparing water to be electrolyzed 131 and / or the first device for preparing water to be electrolyzed 133 respectively constitute a movable skid-mounted structure; a water treatment module configuration area, a water storage module configuration area and a water pumping module configuration area are provided in the movable skid-mounted structure, and the water treatment module configuration area is configured and installed with all or part of water treatment modules selected from a variety of different water treatment modules, the water storage module configuration area is configured and installed with an input side water storage device and an output side water storage device connected to each water treatment module installed in the water treatment module configuration area in a one-to-one correspondence, and the water pumping module configuration area is configured and installed with water pumping modules corresponding to each water treatment module installed in the water treatment module configuration area, and each water pumping module is used to drive the water in the input side water storage device connected to the corresponding water treatment module to pass through the corresponding water treatment module and then enter the output side water storage device connected to the corresponding water treatment module.

[0085] The first device for preparing water to be electrolyzed 131 and / or the second electrolysis hydrogen production device 133 are designed as a movable skid-mounted structure, and a water treatment module configuration area, a water storage module configuration area and a water pumping module configuration area are set therein. The main purpose is to improve the modularity, flexibility and adaptability of the system, and to facilitate rapid assembly, disassembly and movement according to different application scenarios and needs.

[0086] Specifically, by adopting a movable skid-mounted structure, the first water preparation device to be electrolyzed 131 and / or the second electrolytic hydrogen production device 133 can be manufactured into standardized modules, which are convenient for factory prefabrication and on-site assembly. This design can significantly shorten the construction period of the system, reduce the difficulty of on-site construction, and improve the construction quality and efficiency. In the movable skid-mounted structure, a water treatment module configuration area, a water storage module configuration area, and a water pumping module configuration area are set, and suitable water treatment modules, water storage devices, and water pumping modules can be flexibly selected and configured according to different water quality conditions and processing requirements. This flexibility enables the system to adapt to different application scenarios and meet different processing requirements. Connecting the water treatment module, the water storage device, and the water pumping module one by one and configuring them in different areas can achieve orderly flow and efficient processing of water flow. The water pumping module can drive water to flow between different water treatment modules and water storage devices to ensure the continuous operation of the system. At the same time, this layout is also convenient for the operation, maintenance and management of the system. Due to the use of a removable skid-mounted structure, when the system needs to be upgraded, modified or repaired, each module can be easily disassembled, replaced or maintained without causing a significant impact on the operation of the entire system. This maintainability and upgradeability can extend the service life of the system and reduce the operating cost of the system. The removable skid-mounted structure also allows the system to be easily moved and redeployed according to actual needs. In short, designing the first water preparation device to be electrolyzed 131 and / or the second electrolysis hydrogen production device 133 as a removable skid-mounted structure and reasonably dividing the functional areas can improve the modularity, flexibility and adaptability of the system, facilitate rapid assembly, disassembly and movement, and meet different application requirements.

[0087] Specifically, the second device for preparing water to be electrolyzed 133 comprises a cascade reverse osmosis membrane filtration device, a continuous electrolysis desalination device, and an ion exchange desalination device using a polishing resin, which are arranged in sequence.

[0088] Specifically, Figure 4-Figure 5 As shown, the stepped reverse osmosis membrane filtration device includes a high-pressure reverse osmosis membrane filtration device 133a and a low-pressure reverse osmosis membrane filtration device 133b which are arranged in sequence in front and behind, the clean water outlet of the high-pressure reverse osmosis membrane filtration device 133a is connected to the water inlet of the low-pressure reverse osmosis membrane filtration device 133b, the clean water outlet of the low-pressure reverse osmosis membrane filtration device 133b is connected to the water inlet of the continuous electrolysis desalination device, and the concentrated water outlet of the low-pressure reverse osmosis membrane filtration device 133b is connected to the water inlet of the second device for preparing water to be electrolyzed 133.

[0089] Specifically, the low-pressure reverse osmosis membrane filtration device 133b adopts a roll-type reverse osmosis membrane filtration device, and the high-pressure reverse osmosis membrane filtration device 133a adopts a disc-tube reverse osmosis membrane filtration device.

[0090] Specifically, such as Figure 4-Figure 5 As shown, each input-side water storage device and each output-side water storage device are designed to be water tanks 133c installed in sequence in the water storage module configuration area.

[0091] In addition, from Figure 4-Figure 5 It can be seen that the water tank 133c is arranged and installed on one side of the movable skid-mounted structure base; and the water treatment module configuration area is arranged on the opposite side of the water tank 133c.

[0092] Specifically, the water pumping module uses a water pump 133d. In addition, the water pumping module configuration area is set at the end area of ​​the water treatment module configuration area.

[0093] The above is a description of the relevant contents of the utility model. A person skilled in the art will be able to implement the utility model based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. Landfill leachate purification and hydrogen production equipment, characterized by: include: Pretreatment system, used to pretreat the landfill leachate so that the pretreated wastewater reaches the inlet water quality of the subsequent biochemical treatment system; Biochemical treatment system, used to biochemically treat the pre-treated wastewater, so that the biochemically treated wastewater reaches the inlet water quality of the subsequent wastewater purification coupled electrolytic hydrogen production system; The wastewater purification coupled electrolysis hydrogen production system is used to perform electrocatalytic oxidation coupled hydrogen production on the wastewater after biochemical treatment, and output the electrocatalytically oxidized purified wastewater.

2. The garbage leachate purification and hydrogen production equipment according to claim 1, characterized in that: The pretreatment system comprises a coagulation sedimentation reactor.

3. The garbage leachate purification and hydrogen production equipment according to claim 1, characterized in that: The biochemical treatment system comprises an anaerobic reactor, a first anoxic reactor, a first aerobic reactor, a second anoxic reactor, a second aerobic reactor and a sludge sedimentation tank which are connected in series in the order of water treatment. A sludge return channel for returning the activated sludge in the sludge sedimentation tank to the anaerobic reactor is connected between the anaerobic reactor and the sludge sedimentation tank. A mixed liquid return channel for returning the mixed liquid in the first aerobic reactor to the first anoxic reactor is connected between the first anoxic reactor and the first aerobic reactor. The anaerobic reactor is configured as an anaerobic reactor capable of releasing phosphorus, ammoniation of part of organic matter and denitrification. The first anoxic reactor and the second anoxic reactor are both configured as anoxic reactors capable of anaerobic ammonia oxidation denitrification, denitrification denitrification and denitrification phosphorus removal. The first aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal, oxidative BOD removal and nitrification. The second aerobic reactor is configured as an aerobic reactor capable of aerobic phosphorus removal and oxidative BOD removal.

4. The garbage leachate purification and hydrogen production equipment according to claim 3, characterized in that: The utility model comprises a sludge concentrator, which is arranged after the sludge sedimentation tank and is used for performing solid-liquid separation on the sludge discharged from the sludge sedimentation tank.

5. The garbage leachate purification and hydrogen production equipment according to claim 3, characterized in that: The wastewater purification coupled electrolysis hydrogen production system comprises: A first device for preparing water to be electrolyzed, wherein the input end of the first device for preparing water to be electrolyzed is connected to the drain outlet of the sludge sedimentation tank and the output end is connected to the first electrolytic hydrogen production device, and is used to adjust the wastewater obtained from the drain outlet of the sludge sedimentation tank into the first water to be electrolyzed; A first electrolytic hydrogen production device, the first electrolytic hydrogen production device is used to perform electrocatalytic oxidation coupled hydrogen production on the first water to be electrolyzed, and output electrocatalytically oxidized purified wastewater; A second device for preparing water to be electrolyzed, wherein the input end of the second device for preparing water to be electrolyzed is connected to the first electrolytic hydrogen production device and the output end is connected to the second electrolytic hydrogen production device, and is used to adjust the electrocatalytically oxidized purified wastewater into second water to be electrolyzed; The second electrolysis hydrogen production device is used to produce hydrogen by alkaline water electrolysis, PEM water electrolysis or brine electrolysis on the second water to be electrolyzed.

6. The garbage leachate purification and hydrogen production equipment according to claim 5, characterized in that: The second electrolytic hydrogen production device includes a plurality of independent second electrolytic hydrogen production modules, and the second device for preparing water to be electrolyzed includes a water storage device capable of providing second water to be electrolyzed to each of the plurality of second electrolytic hydrogen production modules.

7. The garbage leachate purification and hydrogen production equipment according to claim 6, characterized in that: The first electrolytic hydrogen production device is a 100kW-class electrolytic hydrogen production device or a MW-class electrolytic hydrogen production device. The power of each of the multiple second electrolytic hydrogen production modules is one order of magnitude lower than that of the first electrolytic hydrogen production device and each adopts a 10kW-class electrolyzer or a 100kW-class electrolyzer.

8. The garbage leachate purification and hydrogen production equipment according to claim 5, characterized in that: The first water to be electrolyzed preparation device is used to temporarily store the wastewater obtained from the drainage outlet of the sludge sedimentation tank and then directly transport the first water to be electrolyzed to the first electrolytic hydrogen production device.

9. The garbage leachate purification and hydrogen production equipment according to claim 5, characterized in that: The first device for preparing water to be electrolyzed and / or the second device for preparing water to be electrolyzed respectively constitute a movable skid-mounted structure; The movable skid-mounted structure is provided with a water treatment module configuration area, a water storage module configuration area and a water pumping module configuration area; the water treatment module configuration area is configured and installed with all or part of the water treatment modules selected from a variety of different water treatment modules; the water storage module configuration area is configured and installed with an input side water storage device and an output side water storage device connected one-to-one with each water treatment module installed in the water treatment module configuration area; the water pumping module configuration area is configured and installed with water pumping modules corresponding one-to-one with each water treatment module installed in the water treatment module configuration area; each water pumping module is used to drive the water in the input side water storage device connected to the corresponding water treatment module to pass through the corresponding water treatment module and then enter the output side water storage device connected to the corresponding water treatment module.

10. The garbage leachate purification and hydrogen production equipment according to claim 5, characterized in that: The second device for preparing water to be electrolyzed comprises a cascade reverse osmosis membrane filtration device, a continuous electrolysis desalination device, and an ion exchange desalination device using a polishing resin, which are sequentially arranged one after the other.

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