249 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 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.

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.

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 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.

The invention relates to the technical field of seawater desalination, and discloses a seawater desalination closed circulation device and system.The seawater circulation unit stores seawater containing inorganic salt and can heat the seawater to the preset temperature of membrane distillation; the membrane distillation unit is used for desalting the heated seawater conveyed by the seawater circulation unit and generating desalted water vapor, and a condensation assembly of the purge gas circulation unit is used for performing multi-stage cooling on the desalted water vapor and producing and recycling condensed water; the purging assembly is used for collecting dry and cold gas discharged from the condensation assembly and pumping the dry and cold gas into the membrane distillation unit for cyclic utilization; the thermal circulation unit is located between the seawater circulation unit and the condensation assembly, and the thermal circulation unit is used for conveying the circulation working medium of the condensation assembly to the seawater circulation unit for thermal circulation utilization and conducting cooling circulation utilization on the circulation working medium subjected to thermal circulation utilization. Compared with the prior art, the energy consumption can be saved by about 20%, and the seawater desalination cost is reduced by about 25%.

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.

A method 30 and apparatus 31 for performing a primary and a secondary process using thermal energy of a body of water comprising a dissolved mineral. The method 30 comprising providing 40 high temperature water 34 from the body of water 33 and low temperature water 35 at from the body of water 33 to a primary apparatus 41, wherein the high temperature water 34 is at a first temperature which is higher than a second temperature of the low temperature water 35. Performing a primary process 50 in the primary apparatus 41, wherein the primary process comprises distilling the high temperature water 34 by membrane distillation to extract freshwater vapour from the high temperature water 34, wherein either the temperature difference between the high 34 and low 35 temperature water provides a temperature gradient to drive the membrane distillation or the low temperature water 35 is used to condense freshwater vapour. Removing the low temperature water 35 from the primary apparatus 60 and performing a secondary process 70 using the low temperature water 35.

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 invention relates to the technical field of phosphoric acid waste liquid purification, and particularly discloses a phosphoric acid waste liquid purification and concentration full-membrane system and process, and the system comprises an ultrafiltration system, a nanofiltration system and a membrane distillation system which are arranged in sequence. According to the ultrafiltration system disclosed by the invention, the water inlet amount is adjusted at normal temperature, so that a certain pressure is reached, and suspended solid particles contained in the phosphoric acid waste liquid are removed through the ultrafiltration membrane assembly; polyvalent ions (such as aluminum ions, zinc ions and iron ions) contained in the phosphoric acid waste liquid are removed through the nanofiltration membrane assembly, the nanofiltration produced water is subjected to water quantity adjustment through the membrane distillation system to reach a certain pressure, the nanofiltration produced water is heated to 85 DEG C through the heat exchanger, and then the nanofiltration produced water passes through the membrane system; according to the phosphoric acid waste liquid purification and concentration device, phosphoric acid waste liquid is purified and concentrated, the automation degree is high, and the occupied area is small.

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 discloses a steel surface hydrochloric acid treatment device which comprises an ultrasonic acid pickling box, a waste acid heating box, a gas condenser, a membrane distillation module and bipolar membrane electrodialysis equipment, the ultrasonic acid pickling box is communicated with the waste acid heating box through a drainage pump, the waste acid heating box is communicated with the gas condenser through a corrugated pipe, and the gas condenser is communicated with the membrane distillation module. Corrugated hoses are assembled on two sides of the membrane distillation module, the two groups of corrugated hoses are respectively communicated with the bipolar membrane electrodialysis equipment and the gas condenser, a stirring mechanism is assembled at the top of the waste acid heating box, and the stirring mechanism comprises a servo motor. According to the hydrochloric acid treatment device and process for the steel surface, the production cost is reduced, and the negative influence on the environment is reduced, so that a green production mode is really realized, the speed of gas entering the gas condenser is greatly increased, the speed of obtaining regenerated hydrochloric acid through condensation treatment is increased, and the overall processing speed of the device is increased.

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.