298 results about "Membrane distillation" patented technology

The invention discloses a disilane mixed gas dissolving and mixing system and a control method, and relates to the technical field of gas mixing preparation, the disilane mixed gas dissolving and mixing system comprises seven modules, a storage module realizes accurate pressure control through a honeycomb gas storage tank matrix, and the tank wall adopts a nano composite structure for corrosion prevention; the premixing module forms a chaotic flow field by using a double-helix micro-channel and pulse injection; the reaction module is combined with supercritical and electromagnetic resonance to accelerate the reaction; the monitoring module fuses multispectral detection; the control system is based on deep reinforcement learning, in addition, a gradient condensation-membrane distillation separation module, a bionic safety interlocking module and other modules are further arranged, and all the modules cooperate to achieve efficient mixing and production. According to the device and the method, high-precision preparation of disilane mixed gas, precise pressure-controlled material storage, molecular-level efficient mixed reaction, multispectral precise monitoring, intelligent regulation and control, stability guarantee, high safety interlocking and intelligent maintenance are realized, faults can be reduced, the product quality and the production efficiency are improved, and the cost is reduced.

The invention discloses a recovery treatment process of heavy metal production wastewater, and relates to the technical field of wastewater treatment. Adjusting the pH value of the wastewater through pretreatment and stirring; 5%-10% of nanometer seed crystals are added in the seed crystal reinforced vulcanization process, a vulcanizing agent is controllably added, and large-particle-size precipitates are generated through pulse stirring; magnetic field separation is performed after magnetic microsphere adsorption; carrying out selective adsorption and acid regeneration on the chitosan-based magnetic resin; micro pollutants are removed through cooperation of the three-dimensional electrode and photocatalysis; concentrating 10-20 times by membrane distillation to enrich heavy metals; metal simple substances with the purity larger than or equal to 99.5% are recycled through pulse electrodeposition; and after deep treatment, the wastewater reaches the standard to be discharged or recycled (the recycling rate is greater than or equal to 70%). The process innovation comprises the steps of enhancing the seed crystal to improve the vulcanization efficiency by 30%, realizing rapid separation by a magnetic material, reducing the energy consumption by 40% by a three-dimensional electrode coupling membrane method, and constructing a vulcanizing agent regeneration (the regeneration rate is greater than or equal to 85%) and heavy metal closed-loop recovery system. Compared with a traditional process, the heavy metal removal rate is larger than or equal to 99.8%, the treatment cost of each ton of water is reduced by 25%-30%, and the method has the advantages of high efficiency, low consumption, environmental protection and recycling and is suitable for multi-metal complex wastewater.

The invention relates to a kitchen waste oil recovery treatment method, which comprises: S1, carrying out multi-field synergistic pretreatment: sequentially carrying out ultrasonic wave and high-frequency pulse electric field treatment on waste oil to break an emulsion layer, adding magnetic nanoparticles to adsorb polar impurities, and carrying out magnetic field separation to obtain high-purity oil; s2, supercritical catalytic reaction: under the CO2 supercritical condition, using a core-shell structure composite catalyst to synchronously perform transesterification reaction and glycerol dehydration reaction; s3, dynamic membrane separation: separating biodiesel and glycerol in real time through an intelligent membrane assembly; s4, gradient utilization of energy: recovering reaction waste heat to drive membrane distillation to concentrate wastewater, and using tail gas CO2 for carbonation reaction to generate calcium carbonate. Through four core technologies of multi-field collaborative pretreatment, low-temperature supercritical catalysis, dynamic membrane separation and energy gradient utilization, triple limitations on efficiency, cost and environmental protection in the prior art are remarkably broken through.

The present invention discloses a method for synergistically preparing a superhydrophobic membrane by spray-induced nonsolvent phase inversion and click chemistry. The method uses a polymer with a polyvinylidene fluoride as the main structure as a raw material, constructs a micro-nano hierarchical structure in bulk by the spray-induced nonsolvent phase inversion method, and covalently bonds a low surface energy substance to the membrane surface with the assistance of click chemistry technology to achieve the superhydrophobicity of the membrane. The superhydrophobic membrane of the present invention can resist the wetting of liquids with different surface tensions, has good anti-wetting and anti-inorganic fouling properties as well as excellent wastewater treatment capabilities, and can be applied to fields such as membrane distillation seawater desalination, deep treatment of shale gas wastewater and clean water regeneration, etc., broadening the types and application ranges of MD membrane materials.

The invention discloses a membrane assembly with flexible turbulent flow fins for a membrane distillation seawater desalination system, which is characterized by comprising an upper wall, a lower wall, a distillation membrane and flexible fin plates, a hot material liquid channel is formed in the upper wall; a cold material liquid channel is formed in the lower wall; the distillation film is arranged between the upper wall and the lower wall, and two sides of the distillation film are respectively communicated with the hot feed liquid channel and the cold feed liquid channel; a plurality of flexible fins are arranged on the side, facing the distillation film, of the flexible fin plate, and the flexible fin plate is arranged in the hot material liquid channel. The membrane module can effectively weaken the polarization phenomenon and improve the heat and mass transfer capacity and the anti-pollution capacity.

The utility model relates to a treatment system for purifying high-salinity wastewater, which is suitable for treating high-salinity wastewater, particularly desulfurization wastewater of a coal-fired power plant and coal chemical wastewater. By combining efficient flocculation, ozone catalysis and membrane distillation technologies, a self-made chitosan-based flocculant is added in a flocculation stage, and suspended solids and heavy metal ions in wastewater are removed by utilizing good adsorption performance and flocculation capacity of the self-made chitosan-based flocculant; in the ozone catalysis stage, a self-made ternary composite catalyst is added, ozone decomposition is promoted, and organic pollutants are further removed; in the membrane distillation stage, a self-made antifouling and moisture-resistant composite membrane is used for efficient desalination and concentration, and finally efficient purification and recycling of the high-salinity wastewater are achieved. The process can significantly improve the wastewater treatment effect, reduce the concentration of salt and harmful substances in the wastewater, also reduce the operation cost, and is suitable for large-scale industrial wastewater treatment.

The invention discloses a method for intensifying mass transfer by electrolyzed water driven bilateral air-blowing membrane distillation, which comprises the following steps: a three-chamber device is sequentially provided with a positive chamber, a negative chamber and a concentration chamber, the positive chamber and the negative chamber are separated by a nylon diaphragm, and the negative chamber and the concentration chamber are separated by a composite membrane; the method comprises the following steps: preparing materials, wherein an alkaline solution is used as electrolyte of an anode chamber and a cathode chamber; water molecule mass transfer: liquid water molecules in the concentration chamber are driven by vapor pressure difference, and the liquid water molecules absorb heat, are vaporized, penetrate through the composite membrane, enter the cathode chamber and are condensed into a liquid state; uniformizing: uniformizing the concentration of the electrolyte in the cathode chamber by using hydrogen generated in the cathode chamber in the water electrolysis process; and air blowing operation: oxygen generated by the anode is blown into the concentration chamber after being subjected to gas-liquid separation. The problem of absorbent regeneration is solved through the electrolyte of alkaline electrolyzed water, low-value oxygen generated by the electrolyzed water is reasonably utilized, and continuous concentration of high-salinity wastewater at room temperature is realized by coupling absorption membrane distillation and bubbling membrane distillation.

The invention discloses a thermal gradient temperature control type membrane distillation treatment device for industrial wastewater, relates to the technical field of wastewater treatment, and aims to solve the problems that the fluid resistance of a local area is increased in the membrane distillation process, and the separation and purification effect is poor as the temperature difference between the two sides of a membrane is smaller than the fluid temperature difference. The membrane distillation device specifically comprises a membrane shell and water distribution assemblies arranged in the membrane shell and is mainly applied to the membrane distillation treatment process of industrial wastewater, the water distribution assemblies are synchronously arranged on the water inlet side and the water outlet side of the wastewater, the flow direction of the wastewater is changed through tangential grooves and vertical grooves in the water distribution assemblies, and the fluid resistance of a local area in a concentration boundary layer is weakened; and secondary flow guide mixed hot working media and wastewater are adopted to jointly complete cyclic distillation, and based on reduction of membrane interface local area fluid resistance and damage of membrane interface temperature and concentration polarization phenomena, the driving force of the membrane distillation process is increased, and the separation and purification effect is improved.

The utility model discloses a multi-stage treatment system for high-salinity wastewater, which comprises a water sample detection and analysis system for sampling and analyzing the high-salinity wastewater in at least three batches to obtain the pH value, COD (Chemical Oxygen Demand), TDS (Total Dissolved Solids), hardness and the numerical value range of each pollutant content of the wastewater; the ozonization system is used for fully contacting the detected and analyzed high-salinity wastewater with ozone to obtain ozonized effluent; the pretreatment system is used for settling and filtering the ozonized effluent to obtain pretreated effluent and a pretreated concentrated solution; the electrolytic hydrogen production system is used for carrying out in-situ electrolysis on the pretreated effluent to obtain hydrogen, oxygen and a wastewater concentrated solution; the membrane distillation system is used for carrying out membrane distillation treatment on the wastewater concentrated solution to obtain pure water and a membrane distillation concentrated solution; the evaporation system is used for carrying out evaporation treatment on the pretreatment concentrated solution and the membrane distillation concentrated solution to obtain solid waste. According to the utility model, the wastewater utilization rate is greater than 80%, the hydrogen purity is greater than 99.9%, and the TDS of membrane distillation pure water is less than 50mg / L.

Methods and systems for generating electricity or hydrogen from thermal energy are disclosed. The method includes separating a first saline solution from a second saline solution by a selective permeable membrane (104), receiving thermal energy from a heat source by the first saline solution and / or the second saline solution, and mixing the first saline solution and the second saline solution in a controlled manner, the first saline solution being separated from the second saline solution as a salinity difference between the first saline solution and the second saline solution decreases. At least some salinity gradient energy is captured as electrical power. The method further includes transferring thermal energy from the first saline solution to the second saline solution by a heat pump (320), causing an increase in salinity difference between the first saline solution and the second saline solution. The methods and systems may include regeneration processes such as membrane distillation, forward osmosis, electrodialysis, salt evaporation, and / or salt decomposition for further energy efficiency and power generation.

The invention relates to an efficient flocculation, ozone catalysis and membrane distillation combined process which is suitable for treating high-salinity wastewater, especially desulfurization wastewater of a coal-fired power plant and coal chemical wastewater. According to the technology, efficient flocculation, ozone catalysis and membrane distillation technologies are ingeniously fused, a specially-made chitosan-based flocculant is added in the flocculation stage, and suspended solids and heavy metal ions in wastewater are effectively removed by means of the excellent adsorption and flocculation efficiency of the specially-made chitosan-based flocculant; in the ozone catalysis stage, an ozone decomposition process is accelerated by adding a self-developed ternary composite catalyst, so that organic pollutants are deeply purified; in the membrane distillation stage, a self-made antifouling and moisture-resistant composite membrane is used for efficient desalination and concentration, and finally efficient purification and recycling of the high-salinity wastewater are achieved. The process can significantly improve the wastewater treatment effect, reduce the concentration of salt and harmful substances in the wastewater, also reduce the operation cost, and is suitable for large-scale industrial wastewater treatment.

The invention discloses a high-salinity wastewater resourceful treatment system and method. The system comprises a water sample detection and analysis system, a pretreatment system, an ozonization system, an ultrafiltration membrane system, a reverse osmosis system, a membrane distillation system, an electrolytic hydrogen production system, an ozone generation system and an evaporation system. Only reverse osmosis pure water, membrane distillation high-purity water, high-purity hydrogen and evaporated solid residues are generated in the whole process, and zero emission of high-salinity wastewater is achieved. Membrane distillation, electrolytic hydrogen production and ozonized water treatment are combined for use, so that zero discharge of wastewater is realized, and cyclic utilization of resources such as water, oxygen and a low-grade heat source is also realized.

The invention discloses a membrane contactor-membrane distillation device and method for shale gas produced water treatment, and relates to the technical field of water treatment and resource recovery, the membrane contactor-membrane distillation device comprises a membrane contactor system and a membrane distillation system, and the membrane distillation system and the membrane contactor system are connected through a first water outlet tank; the membrane contactor system comprises a water inlet tank, a membrane contactor membrane assembly and a water outlet tank I, the water outlet tank I is connected with the membrane contactor membrane assembly through a water outlet pipeline, and the membrane contactor membrane assembly is connected with the water inlet tank through a water inlet pipeline; the membrane distillation system comprises a membrane distillation membrane assembly and a second water outlet tank. According to the membrane contactor-membrane distillation device and method for treating the shale gas produced water, the membrane contactor system realizes selective and efficient recovery of ammonia by adjusting the pH value of wastewater and circularly absorbing by using a phosphoric acid solution; the membrane distillation system is used for carrying out advanced treatment on the effluent of the membrane contactor after fully absorbing ammonia, and high-quality fresh water is produced under the driving of the temperature difference between heating and condensation.

The invention provides a silicon carbide-based Janus membrane as well as a preparation method and application thereof. The method comprises the following steps: a) ultrasonically spraying a silicon carbide separation layer slurry on a single side of a silicon carbide support body, and carrying out air sintering to obtain a silicon dioxide bonded silicon carbide-based ceramic membrane; and b) performing single-sided super-hydrophobic modification on the silicon dioxide bonded silicon carbide-based ceramic membrane prepared in the step a) by adopting a graft polymerization method to obtain the silicon carbide-based Janus membrane. The super-hydrophobic / hydrophilic Janus membrane prepared by the invention not only has an excellent super-hydrophobic separation layer and an excellent hydrophilic support body, but also has excellent acid and alkali resistance, friction resistance, thermal stability and anti-scaling performance, and the membrane distillation flux is remarkably improved. Meanwhile, a simple cleaning method is used, so that the membrane flux of the membrane can maintain a recovery rate of 90% in vacuum membrane distillation long-acting circulation. Therefore, the super-hydrophobic / hydrophilic composite Janus filter membrane prepared by the preparation method disclosed by the invention has an efficient and environment-friendly seawater desalination application prospect.

The invention relates to the field of industrial production waste liquid treatment, and particularly provides a low-energy-consumption waste acid recycling method. The main process comprises the steps of pretreatment, ultrafiltration, resin adsorption and membrane distillation. Impurities such as oil in the waste acid raw material are removed in the pretreatment link; sS, foam and the like in the waste acid are removed in the ultrafiltration link; impurities such as heavy metals in the waste acid are removed in the resin adsorption link; in the membrane distillation link, a hydrophobic membrane is used as a filtering medium, the steam pressure difference on the two sides of the membrane is used as mass transfer driving force, under the heating condition, water molecules in the raw material liquid are evaporated into water vapor penetrating through the membrane, the solution cannot penetrate through the membrane, the raw material is concentrated along with continuous evaporation of the water molecules, the purpose of concentrating the material liquid is achieved, and waste acid recovery is achieved. According to the method, waste acid is recycled, waste heat of the system is recycled, and the whole technological process is simple, low in operation cost, stable in operation and high in automation degree.

The present invention relates to a falling film distillation system for separating dichloromethane and white oil, which comprises a distillation tower and an evaporator, wherein the distillation tower comprises an upper tower body and a lower tower body; the evaporator comprises an upper tube plate and a lower tube plate respectively arranged at the top and bottom of the upper tower body and forming a closed evaporation chamber with the circumferential inner wall of the upper tower body, a plurality of evaporation tubes, and a steam supply component, wherein the plurality of evaporation tubes are arranged spaced apart from each other, and the upper ports of the plurality of evaporation tubes are connected to the liquid inlet pipe, and the lower ports are connected to the cavity formed by the lower tower body; the distillation system also comprises a gas-liquid separator that can be connected to the gas outlet pipe. The present invention adopts a falling film evaporator, the material residence time is short, the steam working pressure is small and the steam consumption is low, and the evaporated white oil concentrate has a low temperature, light color and high purity, and the evaporated dichloromethane gas is separated and subsequently condensed and dehydrated, and the white oil content in the dichloromethane is within 20ppm.

The present invention relates to processes for electrolysis of water to generate hydrogen by means of osmotic membrane distillation plants, and to osmotic membrane distillation plants designed and suitable for such processes.

The disclosure relates to a purification system and a purification bag (6) for use therein, configured for (solar) heat-driven water purification of contaminated water. The purification bag (6) comprises a distillation assembly (601,..60n), comprising: - a contaminated water chamber (30) for collecting contaminated water, the contaminated water chamber (30) comprising a top sheet configured for absorbing heat; - a purified water chamber (50) for collecting purified water, the purified water chamber (50) comprising a condensation sheet configured for collecting condensed purified water; - a membrane (40) arranged between the top sheet and condensation sheet, the membrane dividing the distillation assembly into the contaminated water chamber (30) and the purified water chamber (50), wherein the membrane (40) comprises a membrane sheet configured for separation of the associate part of the contaminated water portion received by the distillation assembly into the purified water portion and a residual water portion comprising water and contaminants remaining in the contaminated water chamber by at least one of membrane distillation and pervaporation through the membrane sheet; wherein the top sheet and the membrane sheet are polymeric sheets that are bonded to each other by welding according to a welding pattern.

The utility model discloses a resourceful treatment system for ammonia nitrogen of manganese slag percolate. The resourceful treatment system comprises a water collecting tank, a manganese precipitation reaction tank, a first filter pressing device, a hardness removal reaction tank, a second filter pressing device, an intermediate water tank, a precise filtering device, an ultrafiltration device, a gaseous membrane deamination device, a bipolar membrane electrodialysis device, a rectification device and a multi-effect membrane distillation device which are sequentially connected in series. Manganese residue leachate obtained after manganese precipitation, hardness removal and filtration enters a gaseous membrane method deamination device, ammonia nitrogen in the leachate is removed to reach the standard to be recycled, a by-product ammonium sulfate solution is treated through a bipolar membrane electrodialysis device to obtain dilute ammonia water and dilute sulfuric acid, the dilute ammonia water is rectified, concentrated and recycled in electrolytic manganese production, and the dilute sulfuric acid is recycled. Dilute sulphuric acid is concentrated by the multi-effect membrane distillation device and then returns to the gaseous membrane deamination device to be recycled as an absorbent. According to the device, ammonia nitrogen in the manganese residue leachate can be removed to reach the standard, ammonia nitrogen resource recycling is realized, and the process is water-saving, energy-saving and efficient.

A membrane distillation regenerator can include a first liquid channel through which a first liquid flows at a first temperature, a second liquid channel through which a second liquid flows from the first liquid channel and at a second temperature higher than the first temperature, a condensation cell disposed between the first liquid channel and the second liquid channel, and a permeable membrane disposed between the second liquid channel and the condensation cell. The regenerator can include several distillation stages in which the vapor separated from the second liquid can pass from an evaporation chamber of the second liquid channel through the membrane and into a corresponding condensation chamber of the condensation cell.

The invention relates to the field of ocean energy utilization, in particular to an ocean temperature difference energy water, electricity and hydrogen cogeneration system based on a non-azeotropic working medium and membrane distillation. The system comprises a direct contact type membrane distillation module, a non-azeotropic working medium circulation module and a seawater hydrogen production module, the direct contact type membrane distillation module comprises a direct contact type membrane distillation assembly which is internally provided with a first hydrophobic breathable membrane and is divided into a feed liquid side and a fresh water side by the first hydrophobic breathable membrane, a hot seawater pump for conveying hot seawater to the feed liquid side, a fresh water tank circularly communicated with the fresh water side, and a heat exchanger positioned between the fresh water side and the fresh water tank; the seawater hydrogen production module comprises an electrolytic cell which is internally provided with a second hydrophobic breathable membrane and is divided into a seawater side and an alkali liquor side by the second hydrophobic breathable membrane, a seawater pump for conveying hot seawater to the seawater side, an oxygen separator and a hydrogen separator for separating oxygen from hydrogen, and a hydrogen treatment assembly. According to the invention, seawater is spontaneously evaporated into water vapor which is absorbed by alkali liquor, so that seawater desalination without electric energy consumption is realized, and hydrogen is prepared by using the alkali liquor.

A water desalination system including a sweeping gas membrane distillation (SGMD) unit in integration with a Jet Impingement Condenser (JIC) unit. The SGMD unit includes a water heater and a water pump connected through an inlet and an outlet to a semi-permeable membrane placed inside a distillation unit. The SGMD unit further includes an air compressor coupled to a humidity sensor, a pressure gauge, a temperature probe, and a flow meter. The JIC unit includes an air accumulation enclosure with an inlet, an air compressor outlet, and a coolant. The JIC unit further includes a perforated plate, and a condenser surface in contact with a sweeping gas inlet. The water desalination system further includes a power unit connected to the water heater and the coolant.

A system for desalinating water using membrane distillation (MD) integrated with an ejector includes an ejector module and a membrane module. The ejector module includes a water ejector, a first water circulation pump, and a freshwater tank. Freshwater is continuously pumped from the freshwater tank, through the water ejector, and back to the freshwater tank. The membrane module includes a feed tank, a second water circulation pump, a water heater, and a membrane distillation unit. Salt water from the feed tank is pumped through the water heater to form vapor, which is then directed to the membrane distillation unit. The membrane distillation unit comprises a feed chamber, a membrane, and a vapor chamber. Vapor passes through the membrane to the vapor chamber connected to the water ejector. The vapor chamber, under a vacuum, does not include an outlet configured to receive a sweeping gas.

The utility model discloses a negative carbon recycling and circulating system based on membrane separation and s-CO2 circulation, which relates to the technical field of waste gas and wastewater treatment and energy recycling and comprises a membrane distillation wastewater device, a membrane separation CO2 trapping device and an s-CO2 power generation device. The membrane separation CO2 trapping device comprises a dust remover, an absorber, a membrane separation assembly and a storage device; the s-CO2 power generation device comprises an evaporator, a turbine, a heat regenerator, a condenser and a power generator; a diverter valve is arranged on the two-way reversible loop, a pipeline where waste gas is located is communicated with the diverter valve, the waste gas enters the two-way reversible loop through the diverter valve, and a membrane distillation device, an s-CO2 power generation device and a membrane separation CO2 trapping device are arranged in the two-way reversible loop. The method is used for solving the problems of low waste heat utilization efficiency of industrial waste gas and waste water and high energy consumption of waste water treatment and CO2 capture in a traditional process, intelligent waste heat distribution and multi-system collaborative optimization are achieved, then efficient energy conversion, water resource recycling and negative carbon emission are achieved, and the purposes of energy conservation, efficiency improvement and green development are achieved.

This invention discloses an ultrasonic-assisted membrane distillation system, comprising a liquid supply device for providing raw water; an ultrasonic-assisted membrane distillation assembly including multiple circulating filtration components, with adjacent circulating filtration components connected together, and the circulating filtration component at the starting end connected to the liquid supply device; and a liquid storage device, with at least a portion of the circulating filtration components connected to the liquid storage device. This invention also discloses a processing method for the ultrasonic-assisted membrane distillation system, wherein the ultrasonic-assisted membrane distillation system is the aforementioned ultrasonic-assisted membrane distillation system. The ultrasonic-assisted membrane distillation system and processing method disclosed in this invention can solve the problem of poor performance in existing membrane distillation systems.

A method and system of generating electrical power or hydrogen from thermal energy is disclosed. The method includes separating, by a selectively permeable membrane, a first saline solution from a second saline solution, receiving, by the first saline solution and / or the second saline solution, thermal energy from a heat source, and mixing the first saline solution and the second saline solution in a controlled manner, capturing at least some salinity-gradient energy as electrical power as the salinity difference between the first saline solution and the second saline solution decreases. The method further includes transferring, by a heat pump, thermal energy from the first saline solution to the second saline solution, causing the salinity difference between the first saline solution and the second saline solution to increase. The method may include a process of membrane distillation, forward osmosis, evaporation, electrodialysis, and / or salt decomposition for further energy efficiency and power generation.

The application provides a polytetrafluoroethylene / polyamide subcomposite fiber membrane and a preparation method and application thereof. The preparation method of the polytetrafluoroethylene / polyamide subcomposite fiber membrane comprises the following steps: providing a spinning solution and performing electrostatic spinning, performing heat treatment after obtaining a fiber membrane, and finally obtaining a polytetrafluoroethylene / polyamide subcomposite fiber membrane; the spinning solution comprises a spinning aid, polytetrafluoroethylene and a polyamide acid salt; the spinning aid is selected from one or more of polyethylene oxide, polyvinylpyrrolidone and polyvinyl alcohol. The composite fiber membrane prepared by the technical scheme has good hydrophobicity and good wet resistance, and has uniform and stable pore structure, good pore connectivity and good air permeability of the membrane, and is very suitable for being used in the fields of membrane distillation and the like.

The utility model relates to a system for treating landfill leachate by coupling forward osmosis and membrane distillation, which mainly solves the following problems in landfill leachate concentrated water treatment: high comprehensive energy consumption, membrane pollution risk and difficulty in regeneration of drawn liquid. The device comprises a pretreatment unit, a forward osmosis module, a membrane distillation module and a draw solution storage tank, a water inlet of the pretreatment unit is connected with a landfill leachate concentrated water source, and a discharge port of the pretreatment unit is connected to a leachate side inlet of the forward osmosis module through a first delivery pump; a draw liquid side outlet of the forward osmosis module is connected to a liquid inlet of the membrane distillation module through a membrane distillation heater and a second delivery pump; a concentrated liquid outlet of the membrane distillation module and a draw liquid side inlet of the forward osmosis module form a closed loop through a draw liquid storage tank; an on-line conductivity monitor is arranged in the draw solution storage tank, and a salt supplementing valve is arranged at a feeding port of the draw solution storage tank. And a reflux pump is arranged between the draw solution storage tank and the forward osmosis module. The method is used for treating the leachate concentrated water of the domestic waste landfill.

The invention discloses a membrane distillation coupling adsorption lithium extraction device and a lithium extraction method, and belongs to the field of low-grade brine resource development. The membrane distillation coupling adsorption lithium extraction device comprises a membrane distillation assembly and an adsorption unit, and low-grade salt lake brine is heated by photo-thermal / geothermal resources and enters the membrane distillation assembly to realize fresh water recovery and brine concentration upgrading, so that the low-grade salt lake brine enters the adsorption unit to realize efficient extraction of lithium resources. The device synchronously realizes upgrading of low-grade brine and recovery of fresh water, effectively reduces the lithium extraction period of the low-grade brine, and improves the adsorption lithium extraction performance.