Refuse station leachate treatment device

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a garbage station leachate treatment device. The system comprises an adjusting system, a pretreatment system, a filter pressing system, a first-stage biochemical system and a second-stage biochemical system which are connected in sequence, the adjusting system is used for removing floating oil in the leachate, the pretreatment system is used for adsorbing and precipitating a refractory medium in the leachate, and the filter pressing system is used for separating a solid medium after adsorption and precipitation; the first-stage biochemical system comprises a first-stage A2O biochemical pool and a sedimentation pool, and the second-stage biochemical system comprises a second-stage A2O biochemical pool and an MBR ultrafiltration membrane system; the sedimentation tank is in reflux connection with the first-stage A2O biochemical tank and / or the pretreatment system, and the MBR ultrafiltration membrane system is in reflux connection with at least one of the second-stage A2O biochemical tank, the first-stage A2O biochemical tank or the pretreatment system. The utility model is used for solving the problem that the effluent discharge standard of the leachate of the garbage station is difficult to reach the standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a leachate treatment device for a garbage station. Background Art

[0002] Due to the complexity of garbage components, the pollutants in leachate are complex. The pollutants in leachate include insoluble organic matter, colloids, inorganic ions and nutrients. Among them, ammonia nitrogen and various dissolved cations, heavy metals, phenols, soluble fatty acids and other organic pollutants are the main ones.

[0003] High concentration of ammonia nitrogen is one of the water quality characteristics of leachate. Compared with urban sewage, the ammonia nitrogen concentration of landfill leachate is tens to hundreds of times higher. On the one hand, high concentration of ammonia nitrogen has a certain inhibitory effect on the biological treatment system; on the other hand, high concentration of ammonia nitrogen causes the carbon-nitrogen ratio in the leachate to be unbalanced, making it difficult for biological denitrification to proceed, resulting in the final effluent being difficult to meet discharge standards. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a garbage station leachate treatment device for solving the problem that the effluent discharge standard of the garbage station leachate is difficult to meet.

[0005] The utility model solves the above technical problems with the following technical solutions: A garbage station leachate treatment device, which includes a regulating system, a pretreatment system, a filter press system, a primary biochemical system and a secondary biochemical system connected in sequence;

[0006] The regulating system is used to remove floating oil in the leachate, the pretreatment system is used to adsorb and precipitate the refractory medium in the leachate, and the filter press system is used to separate the solid medium after adsorption and precipitation;

[0007] The primary biochemical system includes a primary A2O biochemical pool and a sedimentation pool, and the secondary biochemical system includes a secondary A2O biochemical pool and an MBR ultrafiltration membrane system;

[0008] The sedimentation tank is connected to the primary A2O biochemical tank and / or the pretreatment system for reflux, and the MBR ultrafiltration membrane system is connected to at least one of the secondary A2O biochemical tank, the primary A2O biochemical tank or the pretreatment system for reflux.

[0009] Compared with the prior art, the above technical solution has the following beneficial effects:

[0010] The floating oil is removed by adjusting the system, and the difficult-to-degrade heavy metals, insoluble organic matter, colloids, etc. are flocculated and precipitated by the pretreatment system. The precipitate is then discharged by the filter press system. After a series of physical and chemical combined treatments, the treated leachate is passed into the A2O biochemical pool for biochemical treatment. After nitrification and denitrification treatment in the A2O biochemical pool, it is combined with the MBR external membrane to improve the denitrification effect and ensure that the effluent ammonia nitrogen meets the standard. By adopting a combined treatment process of physical and chemical treatment plus multi-stage biochemical treatment plus an external membrane reactor of the MBR ultrafiltration membrane system, the landfill leachate can meet better discharge standards.

[0011] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0012] In one embodiment, it also includes a blowing device, which is connected to a plurality of air stirring components, and the air stirring components are used to provide a bubbling gas source. The air stirring components are arranged in the regulating system, the pretreatment system, the primary biochemical system and the secondary biochemical system.

[0013] In one embodiment, the regulating system includes a plurality of regulating tanks arranged in sequence, an oil scraper is arranged at the liquid surface of the regulating tank, and the air stirring assembly is arranged at the bottom of the regulating tank.

[0014] In one embodiment, it also includes a storage and dispensing system, which includes a plurality of storage and dispensing tanks, the air stirring assembly is installed at the bottom of the storage and dispensing tank, a water inlet valve and a dosing valve group are installed on the storage and dispensing tank, and the dosing valve group is connected to the regulating tank, the pretreatment system and the filter press system for conveying the agent.

[0015] In one embodiment, the pretreatment system comprises: a reaction tank, a pH adjustment tank, a coagulation tank and a sludge tank arranged in sequence;

[0016] The reaction tank, pH regulating tank and coagulation tank are respectively connected to several storage and dispensing tanks through the dosing valve group, which are used to transport demulsifier, liquid alkali and coagulant to the reaction tank, pH regulating tank and coagulation tank. The sludge tank is reflux connected to the sedimentation tank and the MBR ultrafiltration membrane system.

[0017] In one embodiment, the filter press system comprises:

[0018] A sludge dewatering machine, wherein an input end of the sludge dewatering machine is connected to the sludge tank;

[0019] A filtrate collecting tank, wherein the input end of the filtrate collecting tank is connected to the liquid outlet end of the sludge dewatering machine, and the output end of the filtrate collecting tank is connected to the primary biochemical system through a pipeline heater.

[0020] In one embodiment, the A2O biochemical pool includes an anaerobic pool, an anoxic pool and an aerobic pool connected in sequence, the bottom of the aerobic pool is provided with the air stirring assembly, and the anaerobic pool is reflux-connected with the sedimentation tank and the MBR ultrafiltration membrane system.

[0021] In one embodiment, the output end of the MBR ultrafiltration membrane system is connected to a discharge pool, and the discharge pool is connected to a sewage pipe network. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall process of the utility model.

[0024] Figure 2 for Figure 1 Schematic diagram of the overall structure.

[0025] Reference numerals:

[0026] 1. Regulating tank; 2. Oil scraper; 3. Air stirring assembly; 4. Blowing device;

[0027] 5. Storage tank; 6. Water inlet valve; 7. Batching valve group;

[0028] 8. Reaction tank; 9. PH adjustment tank; 10. Coagulation tank; 11. Sludge tank;

[0029] 13. Sludge dewatering machine; 14. Filtrate collection tank; 15. Pipeline heater;

[0030] 16. Anaerobic tank; 17. Anoxic tank; 18. Aerobic tank; 19. Sedimentation tank; 20. MBR ultrafiltration membrane system;

[0031] 21. Drain the pool. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0033] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] like Figure 1-2 As shown, the utility model provides a garbage station leachate treatment device, which includes a regulating system, a pretreatment system, a filter press system, a primary biochemical system and a secondary biochemical system connected in sequence;

[0038] The regulating system is used to remove floating oil in the leachate, the pretreatment system is used to adsorb and precipitate the difficult-to-degrade medium in the leachate, and the filter press system is used to separate the solid medium after adsorption and precipitation.

[0039] Among them, the regulating system includes: a number of regulating tanks arranged in sequence, an oil scraper is arranged at the liquid surface in the regulating tank to scrape off the floating oil on the upper layer of the leachate, and the air stirring component is arranged at the bottom of the regulating tank to generate bubbles at the bottom of the regulating tank to fully agitate the liquid in the entire regulating tank. At the same time, a demulsifier can be added to the regulating tank to separate the oil and water in the leachate, so as to facilitate the oil scraper to scrape off the oil.

[0040] The pretreatment system comprises: a reaction tank, a pH adjustment tank, a coagulation tank and a sludge tank which are arranged in sequence;

[0041] The reaction tank, pH adjustment tank and coagulation tank are respectively connected to the plurality of storage tanks through the dosing valve group, which is used to transport demulsifier, liquid alkali and coagulant to the reaction tank, pH adjustment tank and coagulation tank. Before sedimentation, the dosing valve group is used to transport alkali solution to the pH adjustment tank to balance the acidity and alkali of the leachate, and then the coagulant is used to remove COD, heavy metals and polymers that are difficult to biodegrade. The sludge tank is reflux-connected to the sedimentation tank and the MBR ultrafiltration membrane system.

[0042] The filter press system includes a sludge dewatering machine and a filtrate collecting tank;

[0043] The input end of the sludge dewatering machine is connected to the sludge pool, the input end of the filtrate collecting pool is connected to the liquid outlet end of the sludge dewatering machine, and the output end of the filtrate collecting pool is connected to the primary biochemical system through a pipeline heater. It is used to separate the solid and liquid from the mixture added with coagulant in the coagulation pool and sent to the sludge pool, and the compressed solid sludge is sent to an external compression box, etc. The liquid is always in the filtrate collecting pool for further transportation. When the filtrate collecting pool is sent to the subsequent primary biochemical system, the filtrate is heated to a suitable temperature through the pipeline heater for subsequent biochemical reactions.

[0044] In this embodiment, the primary biochemical system includes a primary A2O biochemical tank and a sedimentation tank, and the secondary biochemical system includes a secondary A2O biochemical tank and an MBR ultrafiltration membrane system;

[0045] The sedimentation tank is connected to the primary A2O biochemical tank and / or the pretreatment system for reflux, and the MBR ultrafiltration membrane system is connected to at least one of the secondary A2O biochemical tank, the primary A2O biochemical tank or the pretreatment system for reflux.

[0046] Specifically, the sedimentation tank is connected to the primary A2O biochemical tank and the sludge tank in the pretreatment system through pipelines, and valves are provided in the inlet pipelines connected to the sedimentation tank, the primary A2O biochemical tank and the sludge tank. The opening and closing of the valves are used to control the sludge in the sedimentation tank to flow back to the primary A2O biochemical tank or the sludge tank or the sludge tank and the primary A2O biochemical tank. Similarly, the sludge in the MBR ultrafiltration membrane system is also connected to the secondary A2O biochemical tank, the primary A2O biochemical tank and the sludge tank in the pretreatment system through pipelines. A valve is provided in each inlet pipeline. The opening and closing of the valves are used to control whether the sludge in the MBR ultrafiltration membrane system is sent to the secondary A2O biochemical tank, the primary A2O biochemical tank, the sludge tank, or other transportation methods.

[0047] Among them, the MBR ultrafiltration membrane system can use an external membrane biochemical reactor. In terms of reaction sludge concentration, the external type can withstand higher sludge concentration. In terms of floor space, the volume of the external membrane biochemical reactor is only about 50%-70% of the internal membrane biochemical reactor, saving floor space. In terms of membrane flux, the flux attenuation rate of the external membrane biochemical reactor is lower than that of the internal type, and its service life is longer. From the cleaning perspective, the external type is fully automatic cip online cleaning, which is simple to operate and has a low cleaning frequency.

[0048] The floating oil is removed by adjusting the system, and the difficult-to-degrade heavy metals, insoluble organic matter, colloids, etc. are flocculated and precipitated by the pretreatment system. The precipitate is then discharged by the filter press system. After a series of physical and chemical combined treatments, the treated leachate is passed into the A2O biochemical pool for biochemical treatment. After nitrification and denitrification treatment in the A2O biochemical pool, it is combined with the MBR external membrane to improve the denitrification effect and ensure that the effluent ammonia nitrogen meets the standard. By adopting a combined treatment process of physical and chemical treatment plus multi-stage biochemical treatment plus an external membrane reactor of the MBR ultrafiltration membrane system, the landfill leachate can meet better discharge standards.

[0049] In this embodiment, since the primary A2O biochemical pool and the secondary A2O biochemical pool are basically the same, they are described uniformly. Specifically, the A2O biochemical pool includes an anaerobic pool, an anoxic pool and an aerobic pool connected in sequence. The bottom of the aerobic pool is provided with the air stirring assembly for providing a large amount of oxygen. The anaerobic pool is reflux-connected with the sedimentation tank and the MBR ultrafiltration membrane system.

[0050] The reflux connection is mainly to reflux sludge with microorganisms. Since the A2O biochemical pool is a biochemical treatment system composed of anaerobic, anoxic and aerobic, it mainly relies on microorganisms to degrade pollutants, and the microorganisms exist in the form of sludge. The sludge reflux is to replenish the microorganisms carried away by the water flow. If it is not refluxed, the microorganisms in the biochemical system will become fewer and fewer, and they will be useless in the future. Therefore, a suction pump is set downstream of the primary A2O biochemical pool and the secondary A2O biochemical pool to return the sludge to the anaerobic pool at the upstream of the A2O biochemical pool; on the other hand, since the sludge will grow and proliferate with the microorganisms, it will cause too much sludge, and the subsequent primary and secondary biochemical systems will not be able to enter water. When there is too much sludge, open the inlet valve of the reflux pipe connected to the sludge pool, send the excess sludge into the sludge pool, and then send it into the filter press system to be discharged outside the entire garbage station leachate treatment device.

[0051] In this embodiment, it also includes a blowing device, which is connected to a plurality of air stirring components. The air stirring components are used to provide a bubbling gas source. The air stirring components can use closed pipes, and a plurality of nozzles are arranged on the pipes, and the pipes are connected to the blowing device. The air stirring components are arranged in the regulating system, the pretreatment system, the primary biochemical system and the secondary biochemical system. The air stirring components are arranged at the bottom of the regulating tank, the bottom of the entire pretreatment system, the bottom of the primary aerobic tank, the bottom of the secondary aerobic tank and the MBR ultrafiltration membrane system.

[0052] It also includes a storage and distribution system, which includes a plurality of storage and distribution tanks, the air stirring assembly is installed at the bottom of the storage and distribution tank, a water inlet valve and a dosing valve group are installed on the storage and distribution tank, the water inlet valve is connected to an external water source, a feeding port is provided on the storage and distribution tank, and the dosing valve group is connected to the regulating tank, the pretreatment system and the filter press system for conveying medicines.

[0053] The output end of the MBR ultrafiltration membrane system is connected to a discharge pool, and the discharge pool is connected to a sewage pipe network.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A garbage station leachate treatment device, characterized in that: It includes a regulating system, a pretreatment system, a filter press system, a primary biochemical system and a secondary biochemical system connected in sequence; The regulating system is used to remove floating oil in the leachate, the pretreatment system is used to adsorb and precipitate the refractory medium in the leachate, and the filter press system is used to separate the solid medium after adsorption and precipitation; The primary biochemical system includes a primary A2O biochemical pool and a sedimentation pool, and the secondary biochemical system includes a secondary A2O biochemical pool and an MBR ultrafiltration membrane system; The sedimentation tank is connected to the primary A2O biochemical tank and / or the pretreatment system for reflux, and the MBR ultrafiltration membrane system is connected to at least one of the secondary A2O biochemical tank, the primary A2O biochemical tank or the pretreatment system for reflux.

2. The processing device according to claim 1, characterized in that It also includes a blowing device, which is connected to a plurality of air stirring components. The air stirring components are used to provide a bubbling gas source. The air stirring components are arranged in the regulating system, the pretreatment system, the primary biochemical system and the secondary biochemical system.

3. The processing device according to claim 2, characterized in that The regulating system comprises a plurality of regulating tanks arranged in sequence, an oil scraper is arranged at the liquid surface of the regulating tank, and the air stirring assembly is arranged at the bottom of the regulating tank.

4. The processing device according to claim 3, characterized in that It also includes a storage and distribution system, which includes a plurality of storage and distribution tanks, the air stirring assembly is installed at the bottom of the storage and distribution tank, and a water inlet valve and a batching valve group are installed on the storage and distribution tank. The batching valve group is connected to the regulating tank, the pretreatment system and the filter press system for conveying medicines.

5. The processing device according to claim 4, characterized in that The pretreatment system comprises: a reaction tank, a pH adjustment tank, a coagulation tank and a sludge tank which are arranged in sequence; The reaction tank, pH regulating tank and coagulation tank are respectively connected to several storage and dispensing tanks through the dosing valve group, which are used to transport demulsifier, liquid alkali and coagulant to the reaction tank, pH regulating tank and coagulation tank. The sludge tank is reflux connected to the sedimentation tank and the MBR ultrafiltration membrane system.

6. The processing device according to claim 5, characterized in that The filter press system comprises: A sludge dewatering machine, wherein an input end of the sludge dewatering machine is connected to the sludge tank; A filtrate collecting tank, wherein the input end of the filtrate collecting tank is connected to the liquid outlet end of the sludge dewatering machine, and the output end of the filtrate collecting tank is connected to the primary biochemical system through a pipeline heater.

7. The processing device according to claim 5, characterized in that The A2O biochemical pool comprises an anaerobic pool, an anoxic pool and an aerobic pool which are connected in sequence. The bottom of the aerobic pool is provided with the air stirring assembly. The anaerobic pool is reflux-connected with the sedimentation tank and the MBR ultrafiltration membrane system.

8. The processing device according to claim 1, characterized in that The output end of the MBR ultrafiltration membrane system is connected to a discharge pool, and the discharge pool is connected to a sewage pipe network.

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