171 results about "Membrane distillation" patented technology

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 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.

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 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.

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.

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.

A kind of multi-energy complementary vacuum membrane distillation wastewater treatment system and method, belong to energy-saving and environmental protection field.The system includes solar heat collector, middle-deep layer geothermal well, vapor compression heat pump, vacuum membrane assembly, circulating pump, heat exchanger, vacuum pump and other equipment.Its characterized in that: with liquid water as working substance, first sequentially through the middle-deep layer geothermal well group buried in underground 1500m below, vacuum membrane distillation secondary steam, vapor compression heat pump and solar heat collection system gradually improve heat, then through heat exchanger heat transfer to the industrial wastewater to be treated, so that it reaches the required temperature, using circulating pump to fill vacuum membrane assembly, under negative pressure environment, through vacuum membrane distillation process purification separation, the produced secondary steam passes through heat exchanger and transfers sensible heat and latent heat to liquid working substance water to condense and collect, the produced concentrated liquid returns to water tank to continue circulating concentration, after reaching the required concentration, recycling.The invention maximizes the recycling of geothermal energy, solar energy and secondary steam heat energy, meets the energy demand in the process of vacuum membrane distillation wastewater treatment through multi-energy complementation, has the advantages of high energy utilization efficiency, low operating cost, strong operating stability, etc., suitable for industrial heating, building heating, ventilation and air conditioning and other fields.

The invention discloses a low-temperature seawater desalination method and device.The seawater desalination method specifically comprises the following steps that S100, raw seawater is introduced into pretreatment equipment and sequentially subjected to grating filtration, ultrafiltration membrane filtration and ion exchange resin adsorption, and pretreated seawater is obtained; s200, feeding the pretreated seawater into seawater heating equipment for heating, and heating the seawater to 50-60 DEG C; s300, the heated seawater is sequentially fed into each stage of flash evaporation chamber of the multi-stage flash evaporation equipment, and in each stage of flash evaporation chamber, the seawater is subjected to flash evaporation due to pressure reduction, and steam is generated; s400, the concentrated seawater subjected to multi-stage flash evaporation is introduced into membrane distillation equipment, a hydrophobic microporous membrane is adopted as a membrane distillation assembly, and water molecules in the concentrated seawater penetrate through membrane holes to form steam under the action of the temperature difference between the two sides of the membrane; and S500, introducing the water vapor generated in the steps S300 and S400 into seawater heating equipment for heat exchange, and heating the seawater while generating condensed fresh water.

The invention discloses a freeze-dried coffee powder preparation method based on an integrated membrane process. The freeze-dried coffee powder preparation method comprises the following steps: baking and frying cleaned coffee beans; the coarse grinding particles are crushed into coffee powder through an airflow impact device; filling the coffee powder into an extraction device, and performing ultrasonic extraction in a low-temperature environment to obtain a coffee extract; filling the coffee extract into a forward osmosis concentration device, concentrating to obtain a coffee concentrated solution, and recycling the drawn solution in the forward osmosis concentration process in a membrane distillation process driven by baking waste heat for regeneration; filtering and sterilizing the coffee concentrated solution by adopting a microfiltration membrane to obtain a sterile concentrated solution; and freeze-drying the sterile concentrated solution in a vacuum environment, and crushing the freeze-dried concentrated solution through a low-temperature crushing device to obtain the freeze-dried coffee powder. High-temperature operation is avoided in the whole preparation process, heat-sensitive functional components in the coffee can be reserved to the maximum extent through low-temperature ultrasonic extraction and normal-temperature non-thermal concentration, and the original flavor and fragrance of the coffee can be effectively reserved through low-temperature freeze drying.

The application belongs to the technical field of membrane distillation, and discloses a kind of persistent super-hydrophobic uniform pore separation membrane and its preparation method and application, monomer, polymer membrane material, solvent, pore-forming agent, initiator are mixed according to proportion, constant temperature stirring, under nitrogen atmosphere and polymer membrane material conventional dissolution temperature, initiate in-situ copolymerization, form casting solution containing strong hydrophobic crosslinkable copolymer A-B, then the casting solution is made into nascent liquid membrane, through short time spray treatment accelerates liquid membrane surface interface phase separation, then the membrane is immersed in coagulation bath and crosslinked and solidified, to obtain persistent super-hydrophobic uniform pore separation membrane, its water contact angle is greater than 150°, and the tensile strength is greater than 3.5 MPa. The preparation method is simple in operation, and the reaction conditions are mild. In the process of membrane preparation, the membrane material is persistent super-hydrophobic and the pore size is uniform, which promotes the improvement of the membrane anti-wetting ability.

The application discloses a method for separating organic salt by Donnan dialysis coupled with membrane distillation process, which comprises the following steps: placing acid wastewater and electrocatalytic synthesis liquid on both sides of a cation exchange membrane in Donnan dialysis, wherein the electrocatalytic synthesis liquid is an alkaline organic aqueous solution; separating a first side chamber and a second side chamber by using a hydrophobic membrane in a membrane distillation process, wherein the solution in the first side chamber is a KOH solution, and the solution in the second side chamber is the electrocatalytic synthesis liquid, and the electrocatalytic synthesis liquid is circulated in the membrane distillation process and the Donnan dialysis; and using a KOH solution as an electrolyte in electrolytic water, and circulating the KOH solution in the first side chamber and the electrolytic water. The method realizes synchronous solution of organic salt dealkalization and acid wastewater neutralization, and reduces the crystallization separation step in the traditional process.

The invention relates to the technical field of water treatment devices, in particular to a waste heat driven membrane distillation water purification device which comprises a membrane distillation reactor, a circulating pipe, a condenser and an oxidizing agent adding device, the membrane distillation reactor is provided with a water inlet component, a water outlet component and a distillation steam outlet, and the water inlet component is communicated with the water outlet component through the circulating pipe; the distilled steam outlet is communicated with the condenser; the oxidant adding device is communicated with the water inlet component and is used for adding peroxydisulfate and percarbonate; a plurality of hollow fiber membranes are arranged in the membrane distillation reactor, and a catalyst is loaded on the inner surfaces of the hollow fiber membranes. According to the invention, industrial waste heat of high-heat wastewater is utilized to activate disulfate and percarbonate to degrade organic matters difficult to degrade in wastewater, meanwhile, a catalyst loaded on the membrane is utilized to synergistically catalyze and degrade pollutants in a water body, and hydrophobic micropores of the hollow fiber membrane drive water vapor to pass through the membrane by utilizing vapor pressure difference inside and outside the membrane so as to realize thorough water purification; the membrane distillation purification efficiency is improved.

The invention discloses a pervaporation-membrane distillation coupling separation method for advanced urine water reuse, and belongs to the technical field of water treatment. The method comprises the following steps: soaking a microporous hydrophobic membrane in a strong alkali solution, and treating at 60-80 DEG C for 4-6 hours; preparing a gel precursor solution through a gel monomer and a cross-linking agent, and coating the gel precursor solution on the surface of one side of the hydrophobic microporous membrane; stabilizing the human urine; the coupling separation membrane with the pervaporation functional layer and the hydrophobic substrate is placed in a membrane pool with the effective working area of 10 cm < 2 >; urine and pure water circulate on the two sides of the separation membrane respectively; one side of a urine feeding liquid is heated to 60 DEG C by using a water bath kettle, and 300-500ml of pure water is used as a condensate; after the urine is treated until about 90% of water is recycled, the feed liquid is replaced with pure water to wash the separation membrane. According to the invention, the problems of low water recovery rate and low reuse water quality in the urine treatment process of the traditional distillation membrane are solved, the reuse rate of urine water is greatly improved, the separation membrane is not wetted, and the conductivity of discharged water is greatly reduced.

The invention belongs to the technical field of water treatment, and particularly relates to a modularized multi-stage membrane distillation synchronous concentration device and method. The device comprises one or two of a concentration module and a desalination module, the concentration module and the desalination module comprise the following devices which are stacked in sequence: a concentration piece, a porous membrane and a vacuum piece; each group of the sequentially stacked devices forms a membrane separation unit, and the number of the membrane separation units is one or more. The system adopts an innovative multi-stage modular expansion framework, and the core of the system is an inter-stage isolation structure based on gradient pressure balance. The whole process integration of front-end desalination and impurity removal, middle-end gradient concentration and tail-end pure water production is realized in the same set of plate and frame type assembly. According to the structure, the hydrophobic microporous membranes and the plate frame type assemblies are alternately stacked to form the concentration chamber and the desalination chamber, flexible expansion from a single stage to multiple stages is supported, and high concentration and desalination application scenes with different scales and treatment requirements are perfectly adapted.

The wastewater treatment system according to an embodiment of the present invention is used for treating wastewater containing a sodium sulfate solution, and comprises: an electrodialysis device for separating the sodium sulfate solution of the wastewater into a first solution containing sulfate ions, a second solution containing sodium ions, and circulating wastewater from which sodium sulfate has been removed; a first membrane distillation device that extracts purified water from the first solution in order to concentrate the first solution; and a second membrane distillation device that extracts purified water from the second solution in order to concentrate the second solution. According to the wastewater treatment system disclosed by the embodiment of the invention, salt compounds and other harmful ions in the wastewater can be selectively separated through the electrodialysis device so as to effectively separate a high-concentration ionic solution. Therefore, not only can substances after wastewater treatment be recycled to the maximum extent, but also the environmental harmfulness of salt compounds can be greatly reduced.

The invention discloses a closed system electrolyte repairing process based on a membrane distillation technology. The closed system electrolyte repairing process comprises the following steps: step 1, preparing a composite membrane; step 2, preparing a deionized water sump; step 3, spraying a PVA (Polyvinyl Alcohol) strengthening layer on the outer wall of the deionized water sump; the deionized water sump is made of a composite membrane containing a super-hydrophobic layer, the super-hydrophobic layer is characterized in that the membrane distillation technology is used for isolating water from electrolyte, the vapor pressure difference on the two sides of the microporous hydrophobic membrane is used as pushing force, water, namely, the material hot side, in the membrane makes direct contact with the membrane, and the membrane is not damaged. Water in the membrane is evaporated into water vapor on the membrane surface and then enters the cold side through membrane holes to be condensed, other solute molecules cannot pass through the membrane, and therefore controllable transfer of deionized water is achieved.

This invention discloses a spiral-wound electrochemical carbon capture membrane distillation assembly, a lithium extraction system, and a lithium extraction method, belonging to the field of membrane separation technology. The spiral-wound electrochemical carbon capture membrane distillation assembly includes a shell and a cylindrical electrode and a co-wound assembly disposed within the shell. The co-wound assembly includes a conductive membrane bag assembly, an aeration guide net assembly, and an electrolyte bag assembly, which are stacked and co-wound in a spiral shape. The aeration guide net assembly is used to introduce high-temperature CO2 gas. The conductive membrane bag assembly can permeate, collect, and discharge water vapor. The electrolyte bag assembly is used to carry the electrolyte, and the electrolyte bag assembly and the conductive membrane bag assembly are respectively connected to the positive and negative terminals of an external power supply to perform anodic and cathodic electrochemical reactions, respectively. The cylindrical electrode is disposed outside the co-wound assembly and connected to the negative terminal of the external power supply. This invention can solve the problem of membrane interface scaling and has advantages such as low cost and negative carbon emissions.

The invention discloses a single-stage membrane distillation and vacuum compression integrated device and method, and relates to the field of gas field water treatment.The integrated device comprises a membrane distillation unit which is used for allowing part of gas field water to pass through a membrane and be converted into water vapor to be conveyed to the downstream of the membrane; the vacuum compression unit is connected with the membrane distillation unit and is used for compressing water vapor at the downstream of the membrane to normal pressure and increasing the temperature and enthalpy value of the water vapor; and the heat exchange unit is connected with the membrane distillation unit and the vacuum compression unit at the same time, and the heat exchange unit is arranged to carry out heat exchange on the water vapor heated by the vacuum compression unit and the gas field water before entering the membrane distillation unit. By arranging the vacuum compression unit, the downstream of the membrane can be conveyed to the heat exchange unit for heat exchange with gas field water entering the membrane distillation unit, so that the purposes of saving energy consumption, improving efficiency and reducing cost are achieved.

The utility model discloses an aluminum foil electrolytic waste liquid membrane distillation device which comprises a distillation box, a sealing partition plate and a perforated partition plate are arranged in the distillation box, a vacuum machine is arranged on the left side of the sealing partition plate, a distillation cavity is formed between the sealing partition plate and the perforated partition plate, and a distillation cylinder is arranged in the distillation cavity and made of corrosion-resistant plastic materials. A temperature monitoring assembly used for monitoring the temperature of the distillation cylinder is arranged in the distillation cavity and comprises a temperature sensor and a heating layer, the temperature sensor is arranged on the right side of the sealing partition plate, the heating layer is arranged at the bottom in the distillation cylinder, an electric heating pipe is arranged in the heating layer, and a polytetrafluoroethylene film is arranged on the left side of the partition plate with holes. According to the utility model, different vacuum values are set in the distillation cavity through the vacuum machine, so that the waste aluminum foil electrolyte can be distilled at a low temperature, and the waste aluminum foil electrolyte does not need to be heated to boil, so that the energy consumption can be reduced, and the problem of high energy consumption is solved.

This invention relates to the field of separation membrane technology, and particularly to a photothermal nanofiber membrane capable of retaining volatile organic compounds (VOCs), its preparation method, and its applications. This photothermal nanofiber membrane employs a multi-structure synergistic design to comprehensively optimize the overall performance of membrane distillation. In the gradient wettability structure of the photothermal nanofiber membrane, the hydrophobic layer, with its low thermal conductivity, suppresses heat conduction loss and alleviates temperature polarization; the hydrophilic layer, through its hydration effect, suppresses solute enrichment and alleviates concentration polarization; the nano-thin-coated PDA photothermal layer achieves efficient photothermal conversion through the light trapping effect, while simultaneously providing sufficient anchoring points for the loaded defective UiO-66 nanoparticles; the synergistic effect of each functional layer achieves multifunctional integration of thermal management, anti-fouling, photothermal conversion, and VOCs retention, comprehensively improving the operating efficiency and stability of the membrane distillation system. The preparation method provided by this invention offers strong process controllability and possesses good reproducibility and potential for large-scale application.

A PVT heat pump vacuum membrane distillation wastewater treatment system belongs to the field of energy saving and environmental protection. The system comprises a photovoltaic-thermal (PVT) heat pump, a vacuum membrane distillation assembly, a circulating pump, a vacuum pump and other equipment. Its characteristics are as follows: firstly, industrial wastewater is pretreated into a dilute solution, which is driven into a first heat exchanger by the circulating pump, and the dilute solution is preheated by using the heat energy generated by photovoltaic power generation. Secondly, the dilute solution is evaporated in the vacuum membrane distillation assembly, the produced secondary steam is compressed by a compressor to increase temperature and pressure, and then enters a second heat exchanger to condense and release heat to the concentrated liquid, and the heated concentrated liquid returns to the feed water tank for continuous concentration, and is recycled after reaching the required concentration. The invention makes full use of photovoltaic-thermal and secondary steam latent heat, meets the energy demand of the vacuum membrane distillation wastewater treatment process, has the advantages of high energy utilization efficiency, low operation cost, strong operation stability and the like, and is suitable for industrial heating, wastewater treatment and other fields.

This invention relates to the field of EDB (Electrode Dewatering) processes, specifically to an EDB wastewater recovery process. This invention uses lime and ethylene glycolamine, through a polysaccharide reaction, to effectively reduce the formaldehyde content in the wastewater. The resulting polysaccharide is concentrated by membrane distillation to obtain industrial-grade polysaccharide. This polysaccharide can be used to cultivate bacteria for wastewater treatment in the company. Methanol is recovered by distillation for use in product manufacturing. The treated wastewater is then treated by biochemical bacteria before being discharged in a green manner, significantly reducing the costs of EDB production and wastewater treatment.

The greenhouse brackish water desalination irrigation system coupled with membrane distillation and humidification-dehumidification technology belongs to the field of rural agricultural water resources utilization. The system couples membrane distillation and humidification-dehumidification technology to improve the efficiency of brackish water desalination and regulate the microenvironment in the greenhouse; solar energy is used to heat the underground brackish water to drive the membrane distillation subsystem to utilize brackish water desalination for agricultural irrigation. The high-temperature brackish water with residual heat and low-temperature fresh water discharged from the membrane distillation subsystem are introduced into the wet curtain and condenser in the greenhouse, and the brackish water is desalinated by the humidification-dehumidification technology to improve the utilization rate, and the high-temperature brackish water introduced into the wet curtain is used to heat the low-temperature air, which helps the greenhouse to maintain an environment suitable for crop growth in winter. A regenerator is provided in the system to preheat the underground brackish water with the brackish water discharged from the membrane distillation subsystem with residual heat, which reduces the installation area of the solar collector and the cost of the system.

The invention discloses a direct contact type pervaporation membrane distillation separation device, which comprises a membrane pool, a membrane assembly, a vibrating membrane frame, a reciprocating driving mechanism, a bubbling unit, a shunting module, a confluence module, a liquid collection tank and an industrial personal computer, and the vibrating membrane frame is longitudinally and slidably arranged in the membrane pool and realizes front-back reciprocating motion. The bubbling unit comprises a bubbling machine, a high-pressure air pipe I and a high-pressure air pipe II, an aeration disc is arranged on the high-pressure air pipe I, and a micro-nano aeration head is arranged on the high-pressure air pipe II. Cavities are formed in the membrane assemblies, all the membrane assemblies located at the same position are vertically and sequentially connected in series, and a low-temperature fluid medium sequentially passes through the flow dividing module, the cavities of all the membrane assemblies and the flow dividing module to reach the liquid collecting tank. Vibration and bubbling are combined, so that the flux of the membrane is increased while energy consumption is reduced, turbulent flow and shear flow are formed on the surface of the membrane, pollution to the surface of the membrane is reduced, and the service life of the membrane is prolonged.

This invention relates to the fields of membrane distillation and PVDF membrane composite technology, and discloses a method for preparing a PVDF superhydrophobic composite membrane, comprising the following steps: 1) synthesizing ZIF-8@MWCNT composite material; 2) dissolving ZIF-8@MWCNT and PVDF powder in ethanol; 3) immersing the PVDF membrane in the solution after sonication and drying; 4) placing the dried PVDF membrane and the silane coupling agent 1H,1H,2H,2H-perfluorooctyltrichlorosilane in the same container for sealed reaction and vaporization to obtain the ZIF-8@MWCNTPVDF superhydrophobic composite membrane. This invention successfully constructs a superhydrophobic layer on the surface of a PVDF membrane using ZIF-8@MWCNT. The prepared superhydrophobic composite membrane exhibits high salt rejection rate and high permeation flux, while also demonstrating good thermal and chemical stability, excellent antifouling properties, and antiwetting properties.

The present application relates to a kind of wastewater zero discharge treatment method, belong to water treatment and purification field, the method includes: using the discharge treatment mechanism including activated carbon adsorption device, electrodialysis device and membrane distillation device;Traversal the numerical combination of the specific value of three parameters of set activated carbon concentration, set current value and set membrane thickness to obtain each three-parameter value combination, intelligently predict the backwater water consumption ratio and the volume of concentrated crystalline solid corresponding to each three-parameter value combination;The three-parameter value combination corresponding to the backwater water consumption ratio exceeding limit is used as zero discharge treatment configuration data.Through the present application, in view of the technical problem that zero discharge treatment configuration data needs to be analyzed by repeated load cumbersome debugging test in the prior art, the discharge treatment analysis model of customized structure design can be introduced to intelligently predict the backwater water consumption ratio and the volume of concentrated crystalline solid corresponding to each three-parameter value combination, thereby solving the above technical problems.

The application relates to a preparation method and application of a super-hydrophobic membrane with high-temperature self-repairing performance, and relates to a preparation method and application of a super-hydrophobic membrane.The application aims to solve the problems that the super-hydrophobic membrane used for membrane distillation will appear in flux decline and a large increase in the conductivity of the permeate after a long time of operation, and the water treatment performance of the membrane will be reduced after acid washing, and even the membrane cannot continue to operate.Method: I, Fenton reaction pretreatment;II, preparation of a bottom super-hydrophobic layer;III, preparation of a PVA middle layer;IV, preparation of a top super-hydrophobic layer.The super-hydrophobic membrane with high-temperature self-repairing performance is used as a membrane for membrane distillation.The prepared membrane with high-temperature self-repairing performance has high super-hydrophobic performance and self-repairing performance.A super-hydrophobic membrane with high-temperature self-repairing performance can be obtained.