Anaerobic membrane bioreactor for landfill leachate

Abstract

The utility model discloses a landfill leachate anaerobic membrane bioreactor which comprises an anaerobic reactor, a membrane component and a recovery component, a water inlet pipe and a water return pipe are arranged between the membrane component and the anaerobic reactor, a water inlet pump is arranged on the water inlet pipe, and a water outlet pump is arranged on the water return pipe. The recovery assembly comprises a water-sealed tank, a gas inlet pipe, a connecting pipe, a fan and a boiler which are arranged on the connecting pipe, a heating coil arranged in the anaerobic reactor, and a hot water pipe and a return pipe which are arranged between the boiler and the heating coil. Compared with a traditional built-in membrane assembly, the external membrane assembly has the advantages that the water inlet pump is used for providing the flow speed required by cross-flow filtration, the cross-flow filtration effectively reduces membrane pollution, and meanwhile, the external membrane assembly does not need to use biogas to wash the membrane surface, so that the membrane assembly is more convenient and safer to maintain and replace; in addition, the risk of biogas poisoning and even explosion during membrane replacement is reduced, and the operation stability of the landfill leachate anaerobic membrane bioreactor is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste water treatment technical field, especially, relate to a kind of landfill leachate anaerobic membrane bioreactor. BACKGROUND

[0002] Traditionally, aerobic biological treatment technology dominates due to its ability to decompose organic matter in an aerobic environment. When treating high-concentration wastewater such as landfill leachate, the required aeration quantity and electrical energy consumption also increase significantly due to the extremely high content of organic matter, and its high energy consumption and operating cost become a significant problem. The traditional treatment mode of energy consumption for water quality is gradually transforming to a new energy-saving and low-carbon mode that integrates high-efficiency pollutant removal and simultaneous energy recovery.

[0003] Anaerobic biological treatment technology does not require aeration and can produce biogas, but it faces problems such as low methane yield, poor system stability, and poor effluent quality. This is mainly due to the slow growth rate of anaerobic microorganisms and their sensitivity to environmental changes, which leads to system instability, especially when treating landfill leachate, where the mud running phenomenon is particularly severe.

[0004] To further improve the efficiency of anaerobic biological treatment technology and retain the sludge that plays a major role in degradation, membrane bioreactor technology is introduced and combined with it to form an anaerobic membrane bioreactor. Through the high-efficiency interception of the membrane, complete separation of sludge and water is achieved, resulting in high-quality effluent, no suspended solids, high chemical oxygen demand removal rate, and higher biogas production. However, anaerobic membrane bioreactor technology still faces many challenges in application. Due to the presence of a large amount of organic matter in the water, these substances easily deposit on the membrane surface and form a pollution layer, leading to a decrease in membrane flux. Therefore, the membrane needs to be cleaned frequently. In the existing technology, the membrane assembly is set inside the anaerobic reactor, making it difficult to clean, replace, and assemble the membrane. SUMMARY

[0005] Therefore, it is necessary to provide a landfill leachate anaerobic membrane bioreactor with easy-to-clean and replaceable membrane assembly.

[0006] The utility model solves its technical problem and adopts the technical scheme: a landfill leachate anaerobic membrane bioreactor, the landfill leachate anaerobic membrane bioreactor includes anaerobic reactor and the membrane assembly and recovery assembly connected with the anaerobic reactor, the water inlet pipe and the backwater pipe are arranged between the membrane assembly and the anaerobic reactor, the water inlet pump is arranged on the water inlet pipe, the recovery assembly includes water seal tank, air inlet pipe connected between the anaerobic reactor and the water seal tank, connecting pipe connected with the water seal tank, fan and boiler arranged on the connecting pipe, heating coil arranged in the anaerobic reactor, and hot water pipe and backflow pipe arranged between the boiler and the heating coil.

[0007] Further, the boiler is provided with a water inlet and a water outlet, the water inlet is arranged adjacent to the water outlet, one end of the hot water pipe is connected with the water outlet, the other end of the hot water pipe is connected with the heating coil, one end of the return pipe is connected with the other end of the heating coil, and the other end of the return pipe is connected with the water inlet.

[0008] Further, the hot water pipe is provided with a hot water circulating pump.

[0009] Further, the recovery assembly further comprises a torch connected with the connecting pipe through a pipeline.

[0010] Further, the bottom of the membrane assembly is provided with a water outlet pipe, and the water outlet pipe is provided with an electric butterfly valve.

[0011] Further, the anaerobic reactor is provided with a feeding pipe, one end of the feeding pipe extends into the inner cavity of the anaerobic reactor from the top of the anaerobic reactor and extends to the bottom of the inner cavity of the anaerobic reactor.

[0012] Further, the anaerobic reactor is further connected with a sludge discharge pipe, and the sludge discharge pipe is provided with a sludge discharge pump.

[0013] Further, the anaerobic reactor adopts a ceramic spliced tank structure.

[0014] Further, the membrane assembly adopts PDVF material, the membrane pipe has a diameter of 13mm, the cross-flow flow rate is 5m / s, and the ultrafiltration membrane has a filter pore diameter of 30nm.

[0015] The garbage leachate anaerobic membrane bioreactor provided by the utility model has the advantages that: the membrane assembly is externally arranged, the concentrated water in the membrane assembly is returned to the anaerobic reactor, compared with the traditional internally arranged membrane assembly, the necessary upflow velocity can be provided in the anaerobic reactor, the cross-flow filtration flow rate is provided by using the water inlet pump, the membrane pollution is effectively reduced, the membrane does not need to be cleaned frequently, the externally arranged membrane assembly does not need to use biogas to flush the surface of the membrane, the maintenance and replacement of the membrane assembly are more convenient and safe, the risk of biogas poisoning or explosion during the replacement of the membrane is reduced, and the operation stability of the garbage leachate anaerobic membrane bioreactor is enhanced; meanwhile, the biogas generated in the fermentation reaction process of the anaerobic reactor is fully utilized, the water in the boiler is heated by using the heat of the biogas, the heated water is transported into the heating coil for anaerobic heating, and then the medium-temperature operation environment in the anaerobic reactor is maintained, therefore, a steam device does not need to be additionally arranged in the anaerobic reactor for heating, the efficient utilization of energy and the double energy-saving effect are realized, and the overall energy efficiency and environmental protection performance of the system are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in connection with the drawings and embodiments.

[0017] Figure 1 It is the structure schematic diagram of the garbage leachate anaerobic membrane bioreactor of the utility model.

[0018] The names and numbers of parts in the figure are as follows: 1, anaerobic reactor;11, feed pipe;12, sludge discharge pipe;120, sludge discharge pump;2, membrane assembly;21, water inlet pipe;211, water pump;22, return water pipe;23, water outlet pipe;3, recovery assembly;31, air inlet pipe;32, water seal tank;33, connecting pipe;34, fan;35, boiler;351, water inlet;352, water outlet;36, torch;361, pipeline;37, hot water pipe;38, heating coil;39, reflux pipe. DETAILED DESCRIPTION

[0019] The utility model will be further described below in connection with the drawings and embodiments. This figure is a simplified schematic diagram, and only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0020] Please refer to Figure 1 The utility model provides a kind of garbage leachate anaerobic membrane bioreactor, it includes anaerobic reactor 1, membrane assembly 2 and recovery assembly 3, membrane assembly 2 and recovery assembly 3 are connected with anaerobic reactor 1. When using, leachate first enters anaerobic reactor 1 and carries out fermentation reaction, and the methane produced enters recovery assembly 3 and is recycled, and treated wastewater enters membrane assembly 2 and carries out solid-liquid separation, and concentrated water is refluxed to anaerobic reactor 1, and water is then entered subsequent processing system.

[0021] Anaerobic reactor 1 is provided with feed pipe 11, and one end of feed pipe 11 extends into the inner cavity of anaerobic reactor 1 from the top of anaerobic reactor 1 and extends to the bottom of the inner cavity of anaerobic reactor 1. When using, leachate enters anaerobic reactor 1 by feed pipe 11. Anaerobic reactor 1 is also connected with sludge discharge pipe 12, and sludge discharge pump 120 is arranged on sludge discharge pipe 12. When using, start sludge discharge pump 120, so that the on-off of sludge discharge pipe 12 can be controlled, and then the residual sludge accumulated in anaerobic reactor 1 can be discharged regularly. In the embodiment, anaerobic reactor 1 adopts ceramic splicing tank structure, so that installation construction is more convenient.

[0022] The water inlet pipe 21 and the backwater pipe 22 are arranged between the membrane assembly 2 and the anaerobic reactor 1. Specifically, one end of the water inlet pipe 21 is connected to the side wall of the anaerobic reactor 1, the other end of the water inlet pipe 21 is connected to the inlet end of the membrane assembly 2, one end of the backwater pipe 22 is connected to the outlet end of the membrane assembly 2, the other end of the backwater pipe 22 extends into the inner cavity of the anaerobic reactor 1 from the top of the anaerobic reactor 1 and extends to the bottom of the inner cavity of the anaerobic reactor 1, and the bottom end of the backwater pipe 22 is higher than the bottom end of the feed pipe 11. By returning the concentrated water from the backwater pipe 22 to the anaerobic reactor 1, the necessary upward flow rate can be provided in the anaerobic reactor 1, so that the anaerobic reactor 1 does not need to be additionally configured with a stirring system or an anaerobic circulating pump. In the embodiment, the membrane assembly 2 is made of PDVF material, the membrane pipe diameter is 13 mm, the cross-flow flow rate is 5 m / s, and the ultrafiltration membrane with a filter pore size of 30 nm is used, so that the mud running phenomenon is solved, the biogas production and the treatment efficiency of the anaerobic reactor 1 are improved.

[0023] Further, the water inlet pipe 21 is provided with a water inlet pump 211, so as to control the on-off of the water inlet pipe 21. When the water inlet pipe 21 is in an open state, the sludge-water mixture in the anaerobic reactor 1 enters the membrane assembly 2 through the water inlet pipe 21, providing the cross-flow flow rate for the membrane assembly 2 and providing the necessary upward flow rate for the membrane assembly 2 at the same time, and the membrane assembly 2 uses the water inlet pump 211 to provide the flow rate required for cross-flow filtration, without the need to additionally configure a circulating pump for the membrane assembly 2. Compared with the traditional built-in membrane assembly, the water inlet pump 211 is used to provide the flow rate required for cross-flow filtration, the cross-flow filtration effectively reduces the membrane pollution, and the external membrane assembly 2 does not need to be flushed with biogas to clean the membrane surface, so that the maintenance and replacement of the membrane assembly 2 are more convenient and safe, the risk of biogas poisoning or even explosion during membrane replacement is reduced, and the running stability of the landfill leachate anaerobic membrane bioreactor is enhanced.

[0024] The water outlet pipe 23 is arranged on the membrane assembly 2, and an electric butterfly valve (not shown in the figure) is arranged on the water outlet pipe 23. The electric butterfly valve is arranged so as to control the on-off of the water outlet pipe 23.

[0025] The recovery assembly 3 comprises an air inlet pipe 31, a water seal tank 32, a connecting pipe 33, a fan 34 and a boiler 35. The air inlet pipe 31 is connected between the anaerobic reactor 1 and the water seal tank 32. Specifically, one end of the air inlet pipe 31 is connected to the top of the anaerobic reactor 1, and the other end of the air inlet pipe 31 extends into the water seal tank 32. The water seal tank 32 is arranged to maintain the pressure of the anaerobic reactor 1 stable and prevent backfire. The fan 34 and the boiler 35 are arranged on the connecting pipe 33. One end of the connecting pipe 33 extends into the water seal tank 32, and the end of the connecting pipe 33 is arranged higher than the end of the air inlet pipe 31. In use, the leachate is subjected to fermentation reaction in the anaerobic reactor 1, and the produced biogas enters the water seal tank 32 through the air inlet pipe 31. The fan 34 is started to convey the biogas from the water seal tank 32 to the boiler 35, and the biogas heats the water in the boiler 35.

[0026] Further, the recovery assembly 3 further comprises a flare 36 connected to the connecting pipe 33 through a pipeline 361. The flare 36 is arranged to enable the landfill leachate membrane bioreactor to serve as an emergency combustion device for biogas in special cases.

[0027] The boiler 35 is provided with a water inlet 351 and a water outlet 352 arranged adjacent to each other.

[0028] The recovery assembly 3 further comprises a hot water pipe 37, a heating coil 38 and a return pipe 39. The heating coil 38 is arranged in the anaerobic reactor 1. One end of the hot water pipe 37 is connected to the water outlet 352 of the boiler 35, and the other end of the hot water pipe 37 is connected to the heating coil 38. One end of the return pipe 39 is connected to the other end of the heating coil 38, and the other end of the return pipe 39 is connected to the water inlet 351 of the boiler 35. Further, a hot water circulating pump 371 is arranged on the hot water pipe 37 to convey the heated water in the boiler 35 to the heating coil 38 for anaerobic heating, and the cooled water is returned to the boiler 35. The heating coil 38 is arranged to make full use of the biogas produced in the fermentation reaction process of the anaerobic reactor 1. The boiler 35 heats the water in the boiler 35 by using the heat of the biogas, and the heated water is conveyed to the heating coil 38 for anaerobic heating, so that a medium-temperature operating environment is maintained in the anaerobic reactor 1. Therefore, it is not necessary to additionally increase a steam device in the anaerobic reactor 1 for heating, thereby realizing efficient use of energy and double energy-saving effect, and further improving the overall energy efficiency and environmental protection performance of the system.

[0029] In use, the leachate first enters the anaerobic reactor 1 through the feed pipe 11 to carry out fermentation reaction, and the produced biogas enters the water seal tank 32 through the gas inlet pipe 31, then the biogas enters the boiler 35 under the action of the fan 34 through the connecting pipe 33, the biogas heats the water in the boiler 35, the heated water is transported into the heating coil 38 through the hot water pipe 37 to carry out anaerobic heating, the cooled water returns to the boiler 35, at the same time, the treated sewage enters the membrane module 2 through the water inlet pipe 21 to carry out solid-liquid separation, the concentrated water returns to the anaerobic reactor 1 through the backwater pipe 22, and the produced water enters the subsequent treatment system through the water outlet pipe 23.

[0030] The garbage leachate anaerobic membrane bioreactor provided by the utility model, through the external membrane module 2, and the concentrated water in the membrane module 2 returns to the anaerobic reactor 1, compared with the traditional internal membrane module, can provide the necessary upflow velocity in the anaerobic reactor 1, at the same time, the cross-flow filtration required flow velocity is provided by the water inlet pump 211, the cross-flow filtration effectively reduces the membrane pollution, at the same time, the external membrane module 2 does not need to use the biogas to flush the membrane surface, so that the maintenance and replacement of the membrane module 2 are more convenient and safe, and the biogas poisoning or even explosion risk during the membrane replacement is reduced, and the operation stability of the garbage leachate anaerobic membrane bioreactor is enhanced.

[0031] Based on the above ideal embodiments of the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the scope of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A landfill leachate anaerobic membrane bioreactor, characterized by: The anaerobic membrane bioreactor for landfill leachate includes an anaerobic reactor and a membrane assembly and a recovery assembly connected to the anaerobic reactor. A water inlet pipe and a water return pipe are arranged between the membrane assembly and the anaerobic reactor. A water inlet pump is arranged on the water inlet pipe. The recovery assembly includes a water seal tank, an air inlet pipe connected between the anaerobic reactor and the water seal tank, a connecting pipe connected to the water seal tank, a fan and a boiler arranged on the connecting pipe, a heating coil arranged in the anaerobic reactor, and a hot water pipe and a return pipe arranged between the boiler and the heating coil.

2. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The boiler is provided with a water inlet and a water outlet, the water inlet is arranged adjacent to the water outlet, one end of the hot water pipe is connected to the water outlet, the other end of the hot water pipe is connected to the heating coil, one end of the return pipe is connected to the other end of the heating coil, and the other end of the return pipe is connected to the water inlet.

3. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The hot water pipe is provided with a hot water circulation pump.

4. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The recovery component further comprises a torch, which is connected to the connecting pipe via a pipeline.

5. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: A water outlet pipe is provided at the bottom of the membrane assembly, and an electric butterfly valve is provided on the water outlet pipe.

6. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The anaerobic reactor is provided with a feed pipe, one end of which extends from the top of the anaerobic reactor into the inner cavity of the anaerobic reactor and to the bottom of the inner cavity of the anaerobic reactor.

7. The anaerobic membrane bioreactor for landfill leachate according to claim 6, wherein: The anaerobic reactor is also connected to a mud discharge pipe, and a mud discharge pump is provided on the mud discharge pipe.

8. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The anaerobic reactor adopts a ceramic spliced ​​tank structure.

9. The anaerobic membrane bioreactor for landfill leachate according to claim 1, wherein: The membrane assembly is made of PDVF material, and the membrane tube diameter is 13 mm, the cross-flow velocity is 5 m / s, and the ultrafiltration membrane has a filtration pore size of 30 nm.

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