CN210764701U - Domestic waste leachate pretreatment device based on deamination membrane component - Google Patents

Abstract

The utility model discloses a domestic garbage leachate pretreatment device based on a deamination membrane module, comprising a raw water sedimentation tank, a pretreatment unit and a deamination membrane system connected in sequence, the pretreatment unit comprising a sand filter tank, a foam separation tank The bottom of the sand filter tank is connected to the raw water sedimentation tank through a pipeline, and the upper part of the sand filter tank is connected to a foam separator through a pipeline, and the foam separator is connected to the precision filter through a pipeline. One side of the filter is connected, and the rear side of the precision filter is connected to the deamination membrane system. The utility model comprises a raw water settling tank, a sand filter tank, a foam separator, a precision filter and a deamination membrane system, the device is easy to operate, and can effectively remove the macromolecules and organic macromolecular substances in the landfill leachate and the surface in the leachate. The active agent substance can reduce the ammonia nitrogen in the landfill leachate, make the post-treatment section reach a reasonable carbon-nitrogen ratio, and reduce its impact on the subsequent biological treatment and advanced treatment.

Description

A pre-treatment device for domestic waste leachate based on deamination membrane module

technical field

The utility model relates to the technical field of wastewater deamination, in particular to a pre-treatment device for domestic garbage leachate based on a deamination membrane assembly.

Background technique

Municipal solid waste leachate is a black or yellow-brown liquid with a foul odor. The leachate contains a large amount of organic matter, inorganic salts and metal ions, including refractory benzene and its various derivatives. The COD of wastewater can be up to Up to 20000mg/L, ammonia nitrogen up to 2000mg/L. The leachate contains a large amount of macromolecular organic matter such as humic and humic acid. Although this organic matter has a large molecular weight, it has good chemical stability; this wastewater containing toxic aromatic compounds and high ammonia nitrogen cannot be directly and effectively degraded by microorganisms. .

At present, the landfill mainly adopts the method of building a separate sewage station for treatment. These leachate treatment plants generally use a combination of physicochemical pretreatment + biochemical + advanced treatment to achieve standard discharge. Among them, the main function of the pretreatment stage is to degrade part of the organic matter and ammonia nitrogen, reduce the biological toxicity of the leachate, and improve the biodegradability of the leachate. The main processes include flocculation sedimentation, ozone oxidation and ammonia stripping. To remove biochemical organic matter and ammonia nitrogen in leachate, the main processes are A/O, A/A/O, SBR, UASB, MBR, etc. The main function of advanced treatment is to further remove organic matter and total nitrogen in leachate to ensure its The main processes are Fenton oxidation, electrochemistry, activated carbon adsorption and membrane treatment process. The application of membrane technology in leachate treatment is also basically mature. Due to the complex composition of landfill leachate, for different treatment purposes, microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) technology have been applied to some extent.

The hollow fiber microporous membrane materials commonly used in membrane absorption and deamination technology include hydrophobic materials such as polypropylene (PP), polytetrafluoroethylene (PTFE), and polyvinylidene fluoride (PVDF).

Membrane absorption deamination technology generally uses low-concentration acids (sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, etc.) as the absorption liquid, which will not cause secondary pollution, and can also obtain ammonium salts as by-products to make up part of the cost input. The production process of shell-and-tube deamination membrane contactor is to put an appropriate amount of hollow fiber microporous membrane filaments woven to a certain extent into the hollow shell, and then seal the two sides with glue prepared by epoxy resin and curing agent in a certain proportion. , forming the initial form of the deamination membrane module.

The principle of the new deamination membrane technology is that the free ammonia in the ammonia-containing wastewater is vaporized into the micropores on the hydrophobic microporous membrane on the feed liquid tube side, and diffuses through the shell side air, and then enters the microporous membrane on the absorption liquid side to the other side of the microporous membrane. The strand membrane wire is irreversibly absorbed by the acid absorption liquid to generate non-volatile ammonium ions. This process directly uses the chemical potential change of the acid-base neutralization reaction as the driving force for the deamination process. Due to the gas-liquid interface on the acid absorption liquid side The concentration (or partial pressure) of ammonia in the gas phase is strictly zero, so the stable gas film process provides the maximum driving force for the separation of ammonia and nitrogen mass transfer, and at the same time, high-purity and high-concentration ammonium salts (ammonium sulfate, ammonium chloride, Ammonium nitrate, ammonium dihydrogen phosphate or diammonium hydrogen phosphate) by-products.

The use of membrane absorption deamination technology to treat municipal solid waste leachate (ammonia nitrogen concentration can reach 2000mg/L) has disadvantages such as limited treatment efficiency or easy pollution of membrane pores. This technology has high requirements on the influent water quality of wastewater, ss≤5ppm, and has strict restrictions on the content of surfactants, oxidants, organic solvents, etc., and the surface tension is ≥55mN/m. One of the most effective ways to solve the post-biochemical treatment and the final effluent compliance is to seek high-efficiency landfill leachate deamination process.

Utility model content

The purpose of the present utility model is to: in view of the above problems, to provide a domestic waste leachate pretreatment device based on deamination membrane components, which can effectively remove the organic macromolecular substances and surfactant substances in the leachate that affect biochemical treatment. and ammonia nitrogen.

In order to realize the above-mentioned purpose of the utility model, the technical scheme adopted by the present utility model is as follows:

A domestic waste leachate pretreatment device based on a deamination membrane module, comprising a raw water sedimentation tank, a pretreatment unit and a deamination membrane system connected in sequence, the pretreatment unit comprising a sand filter tank, a foam separator and a precision filter , the bottom of the sand filter tank is connected to the raw water sedimentation tank through a pipeline, the upper part of the sand filter tank is connected to a foam separator through a pipeline, and the foam separator is connected to one side of the precision filter through a pipeline , the back side of the precision filter is connected to the deamination membrane system.

Preferably, the deamination membrane system includes a pH adjustment tank, a constant temperature water tank, a deamination membrane assembly and an acid circulation tank, and one side of the upper part of the pH adjustment tank is connected to the bottom of the precision filter through a pipeline, and the The other side of the upper part of the pH adjustment tank is connected to the lower part of the constant temperature water tank through a pipeline, and the upper part of the constant temperature water tank is connected to the bottom of the deamination membrane module through a pipeline installed with a clean water pump. The upper part is connected to the acid circulation tank through a pipeline.

Preferably, the deamination membrane module is of grade 3 or above, and is composed of polytetrafluoroethylene hollow fiber membranes.

Preferably, the bottom end of the outer side of the membrane filament of each stage of deamination membrane module is the waste water inlet, the top end of the outer side of the membrane filament is the waste water outlet, the upper end of the inner side of the membrane filament of each stage of deamination membrane module is the acid inlet, and the inner side of the membrane filament is the acid inlet. The lower end is the acid discharge port; the waste water inlet of the first-stage deamination membrane module is connected to the upper part of the constant temperature water tank through a pipeline, the waste water outlet of each stage of deamination membrane module is connected to the waste water inlet of the next stage, and the last stage of deamination membrane The wastewater outlet of the module is connected to the constant temperature water tank through a pipeline; the acid inlet of each stage of deamination membrane module is connected to the bottom of the acid circulation tank through a pipeline, and the acid discharge port of each stage of deamination membrane module is connected to the acid circulation tank through a pipeline. top connection.

Preferably, a central pipe is arranged in the middle of the raw water settling tank, the bottom of the raw water settling tank has an inverted cone structure, and an emptying valve is opened at the end of the inverted cone structure.

Preferably, the sand filter tank is provided with a filter material layer and a backwashing air-washing pipe, the backwashing air-washing pipe is arranged below the filter material layer, and the filter material layer includes pebbles arranged in sequence from bottom to top. layer, quartz sand layer and anthracite coal layer.

Preferably, a water distribution pipe, a wire mesh filler layer and an aeration pipe are arranged in the foam separator, the wire mesh filler layer is arranged in the middle of the foam separator, and the water distribution pipe is arranged above the wire mesh filler layer. , the aeration pipe is arranged below the wire mesh packing layer; the top of the foam separator is provided with a foam pipe.

Preferably, a stirrer is provided in the pH adjustment tank.

Preferably, a lift pump is provided on the pipeline connecting the precision filter and the pH adjusting tank.

Preferably, a heating pipe is arranged in the constant temperature water tank.

The technical scheme proposed by the utility model is as follows: a pre-treatment device for domestic waste leachate based on deamination membrane components, including a raw water settling tank, a pretreatment unit and a deamination membrane system; wherein the deamination membrane system includes a pH adjustment tank, a constant temperature water tank, Deamination membrane module and acid circulation tank. The front of the deamination membrane system is equipped with a pH adjustment tank. The pH meter in the tank is designed to automatically add alkali to adjust the pH of the effluent water to control the pH of 10 to 11; The water temperature control system is set to automatically control the temperature and control the outlet water temperature to be 35-45°C; the raw water is pressurized by the clean water pump and enters the series circulating membrane for deamination, the waste water passes through the inner side of the membrane wire, and the absorbed acid passes through the outer side of the membrane wire. It migrates to the acid side, reacts with sulfuric acid to generate ammonium sulfate, and the ammonia nitrogen on the water side decreases continuously; the pH of the dilute sulfuric acid solution in the acid circulation tank is controlled at 1-2, and the acid circulation pump is used to absorb the acid circulation and enter the outer side of the membrane filament of the deamination membrane module. There is a 98% concentrated sulfuric acid storage tank and a concentrated sulfuric acid metering pump, and the ammonium salt that reaches a certain concentration enters the ammonium salt storage tank through the ammonium salt extraction pump. The multi-stage membrane module is installed vertically. The wastewater enters from the bottom of the module and flows on the shell side of the membrane module (the outer side of the hollow fiber membrane); the acid absorption liquid enters from the top side and flows on the tube side of the membrane module (the hollow fiber membrane). the inner side of the membrane filament). The top waste liquid outlet of the first-stage assembly is connected with the bottom waste liquid inlet of the second-stage assembly to realize multi-stage series treatment.

Pretreatment unit: At the front end, after filtering with anthracite and quartz sand, it can remove the macromolecular particle size above 10μm and some unsettled suspended particles. The leachate produced by anaerobic composting of domestic waste has complex components, including surfactants, oxidants, organic solvents and other components. It can be removed by air bubble separation after sand filtration and precision filtration. The bottom of the separation column is bubbling with air. When it is sent into the solution, on the surface of the bubbles, the solute and dispersed particles in the solution are adsorbed and attached, so that the solute or solid particles are separated, and the foam layer generated at the top of the column can be removed by a filter; System - precision filter, the mechanical filter element installed in the precision filter device uses a PP filter element with 1μm pores, and the trace suspended particles, colloids, microorganisms, etc. remaining in the water are trapped or adsorbed on the surface and pores of the filter element. With the increase of water production time, the filter element will gradually increase its operating resistance due to the pollution of the retentate. When the water pressure difference between the inlet and outlet reaches 0.1MPa, the filter element can be replaced.

By setting up the pH adjustment tank and heater, it is ensured that the pH of the wastewater entering the deamination membrane module is above 10, and the temperature is above 35 °C (below 45 °C), so that the NH ₄ ⁺ in the wastewater phase will continuously become NH ₃ migrates to the absorption liquid phase, which improves the removal efficiency of NH ₄ ⁺ in wastewater.

To sum up, due to the adoption of the above-mentioned technical solutions, the beneficial effects of the present utility model are:

The utility model of the pre-treatment device for domestic landfill leachate comprises a raw water settling tank, a sand filter tank, a foam separator, a precision filter and a deamination membrane system. Molecular substances and surfactant substances in the leachate can reduce the ammonia nitrogen in the landfill leachate, make the post-treatment section reach a reasonable carbon-nitrogen ratio, and reduce its impact on subsequent biological treatment and advanced treatment.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present utility model;

Fig. 2 is the structural drawing of the sand filter tank of the present utility model;

Fig. 3 is the structural representation of the utility model precision filter;

FIG. 4 is a schematic structural diagram of the deamination membrane module of the present invention.

In the figure, 1-raw water settling tank, 2-center pipe, 3-sand filter tank, 4-filter material layer, 5-backwash gas washing pipe, 6-water distribution pipe, 7-foam separator, 8-wire mesh packing layer, 9-aeration pipe, 10-foam pipe, 11-precision filter, 12-lift pump, 13-stirrer, 14-pH adjusting tank, 15- constant temperature water tank, 16-heating pipe, 17-clean water pump, 18-Deamination membrane module, 19-acid discharge valve, 20-water outlet valve, 21-acid circulation pump, 22-acid circulation tank, 23-ammonium salt discharge valve, 24-wastewater inlet, 25-wastewater outlet, 26-inlet Sour mouth, 27 - diarrhoea acid mouth, 401 - cobblestone layer, 402 - quartz sand layer, 403 - anthracite coal layer.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, preferred embodiments are given below to further describe the present invention in detail. It should be noted, however, that many of the details listed in the specification are only for the purpose of giving the reader a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention may be practiced without these specific details.

Example 1

As shown in FIG. 1 , a pre-treatment device for domestic waste leachate based on a deamination membrane module of the present invention includes a raw water sedimentation tank 1, a pretreatment unit and a deamination membrane system connected in sequence, and the pretreatment unit includes Sand filter tank 3, foam separator 7 and precision filter, the bottom of the sand filter tank 3 is connected with the raw water sedimentation tank 1 through pipelines, and the upper part of the sand filter tank 3 is connected with the foam separator 7 through pipelines, The foam separator 7 is connected to one side of the precision filter 11 through a pipeline, the rear side of the precision filter 11 is connected to a deamination membrane system, and the precision filter 11 is connected to the pipeline of the pH adjustment tank 14 A lift pump 12 is arranged on it; a central pipe 2 is arranged in the middle of the raw water settling tank 1, the bottom of the raw water settling tank 1 is an inverted cone structure, and an emptying valve is provided at the end of the inverted cone structure; as shown in Figure 2 As shown, the sand filter tank 3 is provided with a filter material layer 4, a backwash air wash pipe 5 and a water wash pipe, and the backwash air wash pipe 5 and the water wash pipe are arranged below the filter material layer 4. The sand filter tank 3. There is a filter plate inside for support, and a filter material layer 4 is laid on the top of the filter plate. The filter material layer 4 includes a cobblestone layer 401, a quartz sand layer 402 and an anthracite layer 403 arranged in sequence from bottom to top; The leachate enters the water from the upper part of the central pipe 2 in the middle of the raw water sedimentation tank 1, and a water outlet weir is arranged around the upper part of the cylinder of the raw water sedimentation tank 1. The water outlet pipe of the raw water sedimentation tank 1 is connected with the water inlet pipe at the bottom of the sand filter tank 3; The source comes from the blower, and the water washing is realized by an external high-power clean water pump. At this stage, the particulate matter and macromolecular substances in the landfill leachate are effectively removed, reducing the load of precision filtration.

As shown in FIG. 3 , the foam separator 7 is provided with a water distribution pipe 6 , a wire mesh packing layer 8 and an aeration pipe 9 , the wire mesh packing layer 8 is arranged in the middle of the foam separator 7 , and the water distribution pipe 6 is arranged above the wire mesh packing layer 8, the aeration pipe 9 is arranged below the wire mesh packing layer 8; the top of the foam separator 7 is provided with a foam pipe 10. The upper part of the foam separator 7 goes deep into the water distribution pipe 6 for water distribution. The water distribution pipe 6 is provided with a plurality of nozzles. After uniform water distribution, the landfill leachate can be evenly dispersed in the foam separator 7 to improve the efficiency of foam separation; the foam separator 7 The lower part is connected with the aeration pipe 9, the air source of the aeration pipe 9 also comes from the blower, and the wire mesh packing layer 8 in the middle of the foam separator 7 is used for cutting air bubbles, and through the micropore aeration, the gas passes upward through the middle. In the wire mesh packing layer 8, the waste water is mixed with the gas downward, and foam is formed on the upper part of the wire mesh packing layer 8 to realize the initial separation of the foam; a foam pipe 10 is provided at the top, and the generated foam enters the external foam collection tank through the foam pipe 10. , turned into a liquid for storage. Through bubble separation, the foamed substances removed are mostly fine particles, oxidants and surfactants, so that the hollow fiber hydrophobic membrane in the deamination membrane module is free from the pollution of the above substances and affects the deamination efficiency.

The shell of the precision filter 11 is lined with PTFE stainless steel, and the top and bottom are cylindrical steel structures with elliptical heads. A porous plate with a filter element inside divides the cylinder into two parts: filtration and water outlet, and the built-in mechanical filter The filter element is made of PP filter element with 1μm pores. The waste water enters the water from the water inlet on the side of the precision filter 11 and enters the filter element for filtration. The residual trace suspended particles, colloids, microorganisms, etc. in the water are trapped or adsorbed on the surface and pores of the filter element. The water outlet of the precision filter 11 is arranged at the bottom and is connected to the lift pump 12 to discharge water through negative pressure.

The deamination membrane system includes a pH adjustment tank 14, a constant temperature water tank 15, a deamination membrane assembly 18 and an acid circulation tank 22. One side of the upper part of the pH adjustment tank 14 is connected to the bottom of the precision filter 11 through a pipeline. The other side of the upper part of the pH adjustment tank 14 is connected to the lower part of the constant temperature water tank 15 through a pipeline, and the upper part of the constant temperature water tank 15 is connected to the bottom of the deamination membrane module 18 through a pipeline installed with a clean water pump 17 , The upper part of the deamination membrane module 18 is connected to the acid circulation tank 22 through a pipeline, and the pH adjustment tank 14 is provided with an agitator 13;

The deamination membrane module 18 is of grade 3 or above, and the deamination membrane module 18 of this embodiment is of grade 3, which is composed of polytetrafluoroethylene hollow fiber membranes; as shown in FIG. 4 , the deamination membrane modules of each stage are The bottom end of the outer side of the membrane filament is the waste water inlet 24, the top end of the outer side of the membrane filament is the waste water outlet 25, the upper end of the inner side of the membrane filament of each stage of the deamination membrane module is the acid inlet 27, and the lower end of the inner side of the membrane filament is the acid outlet 27. ; The waste water inlet 24 of the first-stage deamination membrane assembly is connected to the upper part of the constant temperature water tank 15 through pipes, and the waste water outlet 25 of each stage of the deamination membrane assembly is connected to the waste water inlet 24 of the next stage. The waste water outlet 25 is connected to the constant temperature water tank 15 through a pipeline; the acid inlet 26 of each stage of deamination membrane module is connected to the bottom of the acid circulation tank 22 through a pipeline, and the acid outlet 27 of each stage of deamination membrane module is connected to the acid through a pipeline. The top of the circulation tank 22 is connected; the constant temperature water tank 15 is provided with a heating pipe 16 .

The wastewater is fed from the upper part of the pH adjustment tank 14, and the top of the tank is connected to a NaOH solution pipe, and the pH of the wastewater is adjusted to be between 10 and 11 by automatically adding alkali through the pH control system. The water outlet from the upper part of the tank 14 is communicated with the lower part of the constant temperature water tank 15. The constant temperature water tank 15 is provided with a heating pipe 16 and a water temperature control system, so that the water temperature in the tank is always maintained at 35 to 45°C; Entering the deamination membrane module 18, the wastewater containing ammonia nitrogen flows into the water from the waste water inlet at the bottom of the deamination membrane module 18, flows from bottom to top in the shell side of the deamination membrane module 18, and flows out from the waste water outlet at the top of the deamination membrane module 18 , the deamination process is a three-stage PTFE membrane module cycle treatment, and finally the waste water outlet 25 at the top of the third-stage deamination membrane module returns to the constant temperature water tank 15 or sets the water outlet valve 20 to discharge water; the acid absorption liquid is pumped by the acid circulation pump 21 under pressure The acid liquid in the acid circulation tank 22 enters the acid from the acid inlet 26 at the upper part of the deamination membrane module 18, flows from top to bottom in the tube side of the deamination membrane module 18, and flows through the acid outlet 27 at the lower part of the deamination membrane module Three acid discharge valves 19 are respectively set to discharge acid, and the respective acid discharge amounts of the three-stage deamination membrane modules can be mutually adjusted; during the acid absorption liquid circulation process, it is necessary to always ensure that the pH of the absorption liquid in the acid circulation tank 22 is 1-2 , a pH control system is set in the acid circulation tank 22, an acid pump and an industrial sulfuric acid storage tank are externally added, and industrial sulfuric acid is continuously supplemented into the acid circulation tank 22, and a tap water pipe is added to the top of the acid circulation tank 22 to replenish tap water in time; The microporous NH ₃ on the surface enters the acid absorption liquid phase of the tube side from the wastewater phase in the shell side, and is absorbed by the acid liquid and immediately becomes ionic NH ₄ ⁺ . When the mass concentration of the by-product ammonium sulfate in the circulating liquid reaches 10% , the ammonium sulfate solution is discharged from the ammonium salt discharge valve 23 . The ammonium salt is discharged to the storage tank, and is processed by subsequent evaporation, crystallization, centrifugation, drying and other processes to obtain the finished ammonium sulfate. The pre-treated leachate is drained through the outlet valve 20. After the deamination membrane method, the waste water still contains other pollutants and enter into the subsequent aerobic biochemical system for processing.

Although the utility model covers multi-stage pretreatment such as sand filtration, foam separation, precision filtration pretreatment unit and deamination membrane system, due to the particularity of the landfill leachate concentrate, only one process is used for pretreatment, which cannot meet the requirements of the later stage. the biochemical conditions; the aerobic biochemical reaction can be directly carried out after the multi-stage combined pretreatment. Although multi-stage pretreatment is set, the energy consumption (electricity consumption) during the operation period is low, and the ammonia nitrogen removal efficiency is high, so that the aerobic biochemical section can reach a reasonable carbon-nitrogen ratio, and the final effluent is easier to meet the standard.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. a domestic waste leachate pretreatment device based on deamination membrane assembly, is characterized in that: comprise raw water sedimentation tank, pretreatment unit and deamination membrane system connected successively, and described pretreatment unit comprises sand filter tank, foam Separator and precision filter, the bottom of the sand filter tank is connected to the raw water sedimentation tank through a pipeline, the upper part of the sand filter tank is connected to a foam separator through a pipeline, and the foam separator is connected to the precision filter through a pipeline One side of the filter is connected, and the rear side of the precision filter is connected to the deamination membrane system. 2. The household waste leachate pretreatment device based on deamination membrane assembly according to claim 1, wherein the deamination membrane system comprises a pH adjustment tank, a constant temperature water tank, a deamination membrane assembly and an acid circulation tank, One side of the upper part of the pH adjustment tank is connected to the bottom of the precision filter through a pipeline, and the other side of the upper part of the pH adjustment tank is connected to the lower part of the constant temperature water tank through a pipeline, and the upper part of the constant temperature water tank is installed through a pipeline. A pipeline with a clean water pump is connected to the bottom of the deamination membrane module, and an upper part of the deamination membrane module is connected to the acid circulation tank through a pipeline. 3 . The pre-treatment device for domestic waste leachate based on deamination membrane modules according to claim 2 , wherein the deamination membrane modules are grade 3 or above, and are composed of polytetrafluoroethylene hollow fiber membranes. 4 . . 4. The household waste leachate pretreatment device based on the deamination membrane module according to claim 3, characterized in that: the bottom end of the outer side of the membrane wire of each stage of the deamination membrane module is a waste water inlet, and the top end of the outer side of the membrane wire is a waste water inlet. Wastewater outlet, the upper end of the inner side of the membrane wire of each stage of deamination membrane module is the acid inlet, and the lower end of the inner side of the membrane wire is the acid outlet; the waste water inlet of the first-stage deamination membrane module is connected to the upper part of the constant temperature water tank through a pipeline, each The waste water outlet of the first-stage deamination membrane module is connected to the waste water inlet of the next stage, and the waste water outlet of the last-stage deamination membrane module is connected to the constant temperature water tank through the pipeline; the acid inlet of each stage of the deamination membrane module is connected to the acid circulation tank through the pipeline. The bottom of each deamination membrane module is connected to the top of the acid circulation tank through a pipeline. 5 . The pre-treatment device for domestic waste leachate based on deamination membrane modules according to claim 1 , wherein a central pipe is provided in the middle of the raw water sedimentation tank, and the bottom of the raw water sedimentation tank is in the shape of an inverted cone. 6 . structure, the end of the inverted cone structure is provided with an emptying valve. 6 . The household waste leachate pretreatment device based on the deamination membrane module according to claim 1 , wherein the sand filter tank is provided with a filter material layer and a backflushing gas washing pipe, and the backflushing gas The washing pipe is arranged below the filter material layer, and the filter material layer includes a cobblestone layer, a quartz sand layer and an anthracite coal layer sequentially arranged from bottom to top. 7 . The pre-treatment device for domestic waste leachate based on deamination membrane modules according to claim 1 , wherein the foam separator is provided with a water distribution pipe, a wire mesh packing layer and an aeration pipe, and the wire The mesh filler layer is arranged in the middle of the foam separator, the water distribution pipe is arranged above the wire mesh filler layer, and the aeration pipe is arranged below the wire mesh filler layer; the top of the foam separator is provided with a foam tube. 8 . The pre-treatment device for domestic waste leachate based on a deamination membrane module according to claim 2 , wherein a stirrer is provided in the pH adjustment tank. 9 . 9 . The pretreatment device for domestic waste leachate based on the deamination membrane module according to claim 2 , wherein a lift pump is provided on the pipeline connecting the precision filter and the pH adjusting tank. 10 . 10 . The pre-treatment device for domestic waste leachate based on a deamination membrane module according to claim 2 , wherein a heating pipe is arranged in the constant temperature water tank. 11 .

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