5181 results about "Reverse osmosis" patented technology

The invention provides a zero-discharge treatment process for recycling production wastewater, and relates to the technical field of water treatment and recycling, and the zero-discharge treatment process comprises the following steps: S1, oxidizing and degrading COD through ozone and a Fenton reagent, and generating a flocculatable intermediate; s2, intercepting suspended matters by using a gradient aperture filter bed in a grading manner, and monitoring a dynamic membrane resistance coefficient delta Rm in real time to automatically trigger backwashing; s3, coupling an ultrafiltration reverse osmosis membrane to realize that the organic matter rejection rate eta is greater than or equal to 98%, and synchronously regulating and controlling flux and operation pressure by an online spectrometry; s4, regulating and controlling the current density by adopting a rotational flow electric flocculation reactor for directional crystallization to produce industrial salt with Cl <-> less than or equal to 50mg / L; and S5, based on the total dissolved solid recovery rate TR and the comprehensive energy consumption, establishing a multi-target optimization model for real-time parameter adjustment. According to the method, a membrane pollution early warning and backwashing dynamic response mechanism is constructed through cross-scale cooperative regulation and control of delta Rm and the retention rate eta, and a catalytic oxidation effect strengthening and electric crystallization parameter self-tuning technology is combined, so that the problem of cooperative optimization of high-salinity wastewater salt gradient separation and pollutant deep removal is solved.

The invention discloses a method for extracting lithium from a salt lake and an extraction device. The method for extracting lithium from the salt lake provided by the invention comprises the following steps: salt lake brine is subjected to aluminum adsorbent adsorption, ultrafiltration impurity removal, multi-stage nanofiltration magnesium and boron removal, reverse osmosis concentration, ultrafiltration softening deep magnesium removal, resin magnesium and boron removal, MVR evaporation and other technological processes, and a battery-grade lithium carbonate product is obtained. According to the method, the membrane separation technology serves as a core, resin and an evaporation system serve as auxiliary materials, deep separation of magnesium and lithium in the salt lake brine is achieved, the boron removal rate and the lithium recovery rate are high, meanwhile, recycling of water resources is guaranteed, and the whole process has the advantages of being controllable, high in automation degree, low in production cost, small in pollution, high in water recovery rate and suitable for industrial production. The method can be applied to large-scale production of salt lake lithium extraction.

The invention discloses a method and a device for recycling industrial organic waste liquid, belongs to the technical field of waste liquid treatment, and provides the method and the device for recycling the industrial organic waste liquid in order to solve the problems that the treatment efficiency of equipment on waste water is low and the overall treatment cost is increased. Comprising the following steps: S1, respectively collecting industrial organic waste liquid in a collecting tank, adjusting a proper temperature in the collecting tank according to the characteristics of the waste liquid, stirring the waste liquid in the collecting tank at a low speed by utilizing a stirring device, preliminarily filtering the waste liquid by virtue of a filter screen after stirring is completed, and conveying obtained filtrate into a temporary storage tank by virtue of a pipeline, through collection, temporary storage, acid-base neutralization, precipitation, flocculation, sedimentation, ultrasonic treatment, reverse osmosis, supercritical oxidation and the like, organic waste liquid is fully treated step by step, the treatment efficiency is improved, meanwhile, the pollution of wastewater discharge to the environment is reduced, the wastewater can be stirred while a precipitator is added, and the precipitation efficiency of sewage is improved.

The invention discloses a perchlorate wastewater treatment method which comprises the following steps: discharging perchlorate wastewater into an adjusting tank, and adjusting and buffering water quality in the adjusting tank; discharging the adjusted wastewater into a coagulating basin, and adding a coagulant to react with suspended solids in the wastewater; feeding the wastewater subjected to the coagulation reaction into a sedimentation tank, and completing solid-liquid separation in the sedimentation tank; discharging the precipitate, and enabling the treated wastewater to enter a microbial catalysis tank; perchlorate in the treated wastewater is subjected to biodegradation in a microbial catalysis tank; carrying out MBR (Membrane Biological Reactor) treatment on the wastewater subjected to biodegradation, intercepting microorganisms in the wastewater in a biological catalysis tank, and discharging the wastewater which does not contain the microorganisms and is subjected to biodegradation into an RO (Reverse Osmosis) membrane treatment device; the wastewater is subjected to reverse osmosis treatment at the RO membrane treatment device, reverse osmosis concentrated water is conveyed to the biological catalysis tank, and reverse osmosis fresh water is conveyed back to the water purification tank. The biological enzyme catalysis and membrane separation method is adopted, so that the perchlorate wastewater can be discharged after reaching the standard, and the treatment process is efficient, convenient and low in cost.

The invention discloses a preparation method of a reverse osmosis membrane and the reverse osmosis membrane. The preparation method comprises the following steps: (1) adding polyethersulfone into N, N-dimethylacetamide in a heating and stirring state, and stirring for a period of time after charging is completed, so as to obtain a mixed solution; (2) cooling the mixed solution, continuing to add a pore-foaming agent, and stirring for a period of time after charging is completed to obtain a precursor solution; (3) performing vacuum defoaming treatment on the precursor solution to obtain a membrane casting solution; (4) loading the membrane casting solution on a carrier, and then carrying out gel bath treatment to obtain a base membrane; and (5) performing polyamide treatment on the surface of the base membrane to obtain the reverse osmosis membrane. The preparation method disclosed by the invention is simple in process and low in material cost, and the obtained reverse osmosis membrane has more uniform and more through-type pore structures, higher separation efficiency, more excellent chemical stability and better mechanical properties, can adapt to higher operation pressure, and can continuously and stably operate at higher flux under high pressure.

The invention discloses a treatment device and process based on zero discharge of high-concentration coating wastewater, wastewater passes through an adjusting tank and then enters a pretreatment module through a pipeline, the coating wastewater passes through a Fenton tank body, a coagulation tank body and a primary sedimentation tank of the pretreatment module in sequence through the pipeline to be treated, and the coating wastewater is continuously conveyed to a biochemical treatment module; the biochemical treatment module is used for carrying out anaerobic environment treatment through an anaerobic granular sludge bulking bed and then carrying out aerobic environment treatment through an aerobic aeration tank; and introducing the wastewater into a secondary sedimentation tank to separate the formed sludge from water, entering a biochemical tank, carrying out ultrafiltration and reverse osmosis treatment through a deep treatment module, recycling the treated wastewater to a production line, and recycling the generated condensate water and RO fresh water. The adopted wastewater treatment device is combined and optimized by various advanced technologies, so that the treatment efficiency and the water quality are improved, efficient recovery and reutilization of resources are also realized, and the system has good economic benefits and environmental benefits and is suitable for the requirements of modern coating wastewater treatment.

The invention belongs to the technical field of wastewater treatment, and provides an ammonium nitrate production wastewater treatment process which is mainly composed of a neutralization tank, a tubular heat exchanger, a precision filter, a ceramic filter, a concentrated stock solution box, an ionic membrane concentration device, a desalination stock solution box, an ionic membrane desalination device, a reverse osmosis water inlet box, an RO security filter and a reverse osmosis device. The neutralization adjusting system enables the content of dilute nitric acid or free ammonia in the condensate to be reduced to the minimum, normal operation of subsequent treatment procedures is not affected, the condensate is filtered by the filter and then enters a concentrated stock solution box of the electrodialysis system, and stable and normal work of the electrodialysis system is ensured; the concentrated solution containing ammonium nitrate is collected by the concentrated solution box, and then is recycled to a factory area for production by the concentrated solution recycling pump; produced water enters a qualified water tank to serve as circulating water supplementary water, and concentrated liquid returns to an electrodialysis system to be treated again; recycled liquid is recycled, energy is saved, cost is saved, and environment friendliness is achieved.

The invention relates to a water inlet separation net, a reverse osmosis membrane unit, a reverse osmosis membrane element, a filter element and a filter system in the technical field of reverse osmosis membranes. The reverse osmosis membrane unit comprises a water inlet separation net body and a reverse osmosis membrane attached to the reverse osmosis membrane element; the water inlet separation net body is provided with water blocking parts which are arranged at intervals and in a staggered mode in the extending direction of the water inlet separation net body, so that the water inlet separation net forms a water diversion flow channel which is continuously bent; and the distance between every two adjacent water blocking parts is reduced in sequence. The water diversion flow channel is designed to be bent, and the distance between every two adjacent water blocking parts is sequentially reduced, so that the flow speed of raw water is gradually increased, on the basis that the water diversion flow channel is designed to be relatively long, the flow speed of the raw water can be maintained to be gradually increased, the raw water spirally flows in the water diversion flow channel, and the flow area of the raw water is gradually reduced; the shear flow velocity of the concentrated water end is improved, and concentration polarization caused by poor water quality of the concentrated water end is weakened, so that the reverse osmosis membrane can more effectively resist pollution and blockage.

The invention relates to the technical field of water treatment equipment, and particularly discloses intelligent dynamic water-saving two-stage reverse osmosis water treatment equipment which comprises a treatment pipe, the two ends of the treatment pipe are fixedly connected between two sections of water conveying pipes in a sealed mode through bolts, and the outer surface of the treatment pipe is fixedly sleeved with a baffle ring. According to the intelligent dynamic water-saving two-stage reverse osmosis water treatment equipment, along with continuous upward movement of a driving rod, a sealing disc is driven to move upwards along a sliding rod, so that the water pressure of a cavity above the sealing disc is increased, a reverse extrusion force is generated on a filter plate, and impurities blocked at the filter plate generate a reverse extrusion force; after the filtering disc is dredged, the pressure disc and the sealing disc are reset under the action of elastic force to enable the filtering disc to work again, so that the filtering disc is automatically dredged after the filtering disc is blocked in the water treatment process, and the working time of equipment is greatly prolonged; the problem of insufficient water treatment efficiency caused by frequent cleaning of equipment is avoided.

The invention belongs to the technical field of water treatment processes and devices, and particularly relates to a pharmaceutical wastewater treatment process and a pharmaceutical wastewater treatment device. According to the treatment process of the pharmaceutical wastewater, the pharmaceutical wastewater is subjected to the following processes: an electric flocculation process, a catalytic ozonation process, a ceramic membrane separation process and a reverse osmosis process; the membrane aperture of the reverse osmosis process is 0.3-0.4 nm, the transmembrane pressure difference is 2.0-3.0 bar, reverse osmosis desalted fresh water and reverse osmosis strong brine are respectively obtained, the reverse osmosis desalted fresh water directly reaches the standard for reuse, and the reverse osmosis strong brine is returned to the electric flocculation process for repeated treatment. The pharmaceutical wastewater treatment process provided by the invention not only can realize synchronous removal of suspended matters and organic matters, but also can realize desalination and deep purification of pharmaceutical wastewater, and provides a feasible and sustainable solution for pharmaceutical wastewater treatment, and the invention also provides a treatment device thereof.

The invention discloses an intelligent detection and dynamic early warning system based on machine learning and multi-source data fusion, which relates to the technical field of membrane separation process monitoring and consists of a data acquisition and preprocessing part, a physical model and data driving model part, a dynamic weight fusion and self-adaptive mechanism part and a man-machine interaction and alarm part. According to the system, parameters such as membrane flux, transmembrane pressure difference, solution concentration, temperature, water inlet flow and operation pressure are collected, an improved XGBoost machine learning model is combined, and a comprehensive pollution index is constructed to quantify the membrane pollution degree; the model realizes double analysis of a pollution mechanism and a data rule through feature engineering. The system supports full-closed-loop management from minute-level early warning to hour-level cleaning decision making, the threshold value is dynamically adjusted through Bayesian optimization, the generalization and anti-interference capacity of the system are remarkably improved, and the system is suitable for intelligent operation and maintenance of membrane separation processes such as reverse osmosis and ultrafiltration.

The invention relates to the technical field of water resource purification, in particular to a control method and equipment of a reverse osmosis water purification system.The control method comprises the steps that firstly, on the fluctuation dimension of the pre-membrane pressure, the adjusting requirement of the frequency of a high-pressure pump is preliminarily determined on the dimension of the pre-membrane pressure according to an obtained pressure fluctuation index; determining a membrane resistance increase factor representing the pollution state of the reverse osmosis membrane on the basis of the transmembrane pressure difference on the dimension of separation function failure of the reverse osmosis membrane; finally, a membrane separation abnormal value is comprehensively represented by combining a pressure fluctuation index and a membrane resistance increase factor, and a purified water recovery rate is introduced to a membrane separation result end, so that the finally obtained frequency reduction demand degree is more accurate, and the control effect of the reverse osmosis water purification system is improved; therefore, the stable, efficient and sustainable operation of the reverse osmosis water purification system can be ensured while the membrane surface pollutant deposition driving force can be effectively reduced and the membrane pollution speed can be slowed down.

The invention discloses an integrated process for cooperative treatment and up-to-standard discharge of industrial wastewater and domestic wastewater of a power plant, and relates to the field of cooperative treatment of wastewater and sewage, and the integrated process comprises the following steps: configuring a raw water collection system, setting a raw water source, configuring a multi-stage filtration and heating pretreatment process, configuring an ultrafiltration membrane system, and setting a fine filtration path. A first-stage reverse osmosis system is configured, reverse osmosis parameters are set, a second-stage reverse osmosis system is configured, a low-conductivity water treatment path is set, a mixed ion exchanger is configured, a desalted water output path is set, a standby pool body is set, and the adjusting capacity is set. A raw water collecting system, a multi-stage filtering and heating pretreatment process, an ultrafiltration membrane system, a first-stage reverse osmosis system, a second-stage reverse osmosis system, a mixed ion exchanger and a standby pool body are sequentially arranged in the process. The problems of unstable effluent quality, insufficient deep desalination capability and poor emergency regulation capability in a traditional power plant wastewater treatment mode can be effectively solved.

The invention provides a low-carbon circulating technological process for treating high-total-nitrogen wastewater. A main treatment unit and a resource recycling and circulating unit are included; the main treatment unit is characterized in that high-total-nitrogen wastewater sequentially passes through a pH regulating tank, a sulfur autotrophic denitrification tank, a biochemical system, a secondary sedimentation tank, a deep treatment line and ultrafiltration reverse osmosis, produced reclaimed water enters produced water for delivery, and a part of produced concentrated water enters a resource recovery and circulation unit; the resource recovery and circulation unit is characterized in that after concentrated water is treated by a vertical electrophoresis device, mixed acid, mixed alkali and low-salt water are separated out, the mixed alkali is sent to a sulfur autotrophic denitrification tank to be used for supplementing alkalinity consumption of the sulfur autotrophic denitrification system, and the mixed acid sequentially passes through an anaerobic regulating tank, an anaerobic reactor, an alkali washing tower, a biological desulfurization reactor and a sedimentation tank; the recovered sulfur can be sold as elemental sulfur or reused in the sulfur autotrophic denitrification tank, and supernate flows back to the alkaline tower; a green, low-carbon and recyclable water treatment process flow is realized.

The invention discloses an energy-saving and consumption-reducing method for a reverse osmosis membrane system, which belongs to the technical field of water treatment and comprises the following steps: step 1, acquiring various parameter data of the reverse osmosis membrane system in real time; 2, establishing an energy consumption prediction mathematical model of the reverse osmosis membrane system; 3, inputting the real-time parameter data into the energy consumption prediction mathematical model, and judging whether the operation power of the high-pressure pump is reasonable or not according to an output result; 4, when the operation power is not reasonable, the operation power of the high-pressure pump is adjusted in real time; and 5, establishing a membrane pollution concentration early warning model, and carrying out alarm response. According to the method, comprehensive analysis can be carried out in real time according to various parameters of inflow water quality to accurately predict the predicted power, so that whether the set operation power of the high-pressure pump is reasonable or not is judged, the operation power of the high-pressure pump can be dynamically adjusted, the output of energy consumption can be reduced as much as possible under the condition that treatment is qualified, and the operation efficiency of the high-pressure pump is improved. And the cost is saved.

The utility model discloses a throttle valve and water purification equipment, the throttle valve comprises a valve body, a driving assembly, a throttle element and a diaphragm assembly, a valve cavity is formed in the valve body, and a mounting seat is arranged in the valve body; the driving assembly comprises a valve element seat and a valve element, the valve element seat is connected to the valve body, and the valve element is located in the valve element seat; the throttling element is arranged in the valve cavity, the throttling element and the installation base are matched in a sealed mode to divide the valve cavity into a high-pressure cavity and a low-pressure cavity, and when the throttling valve is in a throttling mode, the valve element abuts against the diaphragm assembly on the two protruding ribs and the sealing rib. According to the technical scheme, the two protruding ribs and the sealing rib are arranged on the throttling piece, the throttling channels are formed when the diaphragm assembly abuts against the two protruding ribs, the supporting rib is arranged between the throttling channels in a protruding mode, and therefore the diaphragm assembly is supported, the diaphragm assembly is prevented from being excessively deformed to extrude the throttling channels, and the service life of the diaphragm assembly is prolonged. Therefore, the pre-membrane pressure of the reverse osmosis membrane is improved, and the service life of the water purification equipment is prolonged.

The invention discloses a high-salt-rejection and pollution-resistant polyamide reverse osmosis membrane, which is characterized in that an aromatic cationic surfactant containing two benzene ring structures is adopted to regulate and control the interfacial polymerization reaction of a polyamine monomer and a polyacyl chloride monomer, and a high-salt-rejection and pollution-resistant polyamide functional layer is generated on a porous ultrafiltration base membrane. The effective specific surface area of the polyamide functional layer of the reverse osmosis membrane is gt; 1.2, the surface potential gt when the pH is equal to 7; -20 mV; the molecular weight cut-off of the polyamide reverse osmosis membrane is 1t; the molecular weight is 100Da, and the retention rate for 2000ppm of NaCl is gt; the anti-fouling coating has the advantages of good hydrophilicity and excellent anti-fouling performance. The preparation process of the polyamide reverse osmosis membrane is simple and efficient, and has industrial application potential. The polyamide reverse osmosis membrane can be used for purification and treatment of different types of water, and has important application value.

The invention discloses a modularized ultrapure water preparation and on-line monitoring system, which comprises a pretreatment module, a purification module, a monitoring module and a control module, and is characterized in that a dynamic monitoring end is arranged, and when ultrapure water preparation is monitored in real time, a multi-parameter fusion detection mechanism and self-adaptive threshold analysis are integrated; meanwhile, the abnormal state of the water quality is dynamically judged based on the conductivity, TOC and particulate matter data collected in real time, the sudden change risk of the water quality output by the purification module can be recognized in real time, error accumulation caused by traditional single-point monitoring is avoided, and therefore the purity detection reliability of the ultrapure water is improved; and the reverse osmosis unit and the electrode deionization unit of the purification module can immediately respond to the effluent parameter change of the pretreatment module, so that the hidden dangers of membrane blockage and recovery rate reduction caused by water quality fluctuation are reduced, and the energy consumption redundancy is reduced while the water quality stability is ensured.

The invention discloses a method for purifying disilane, which comprises the following steps: A, filtration and adsorption treatment: mixed gas is sequentially introduced into at least one stage of filter and at least one stage of adsorber to remove solid impurities, the filter is selected from a porous ceramic filter, and the adsorber is selected from an activated carbon adsorber; b, primary rectification: introducing the filtered and adsorbed mixed gas into a heavy component removal tower for primary rectification to remove heavy component impurities, wherein the heavy component impurities are selected from gas impurities of which the molecular weight is greater than that of disilane; c, membrane separation: introducing the mixed gas subjected to primary rectification into a membrane separator, and enabling the mixed gas to pass through an organic polymer reverse osmosis membrane made of an inert material; and D, secondary rectification: introducing the mixed gas subjected to membrane separation treatment into a light component removal tower, and carrying out secondary rectification to remove monosilane. The method disclosed by the invention is simple to operate and few in working procedures, and is beneficial to quickly realizing high-quality separation and purification of disilane.

The utility model discloses a reverse osmosis membrane testing device which comprises a testing table, a placing groove, a valve, a water storage tank, a water suction pump and a water conveying pipe hydraulic oil cylinder, the placing groove is formed in the testing table, a first elastic piece is arranged in the placing groove, a sewage draining opening is formed in the bottom of the placing groove, a water purifying pipe is arranged in the sewage draining opening, and a water outlet is formed in the water purifying pipe. A sealing gasket is arranged at the top of the water purification pipe, a water purification bin is connected to the bottom of the sealing gasket, a sewage bin is arranged at the bottom of the sewage outlet, and a partition plate is arranged in the sewage bin and the water purification bin. A clamping and fixing joint composed of a placing groove, an extrusion cover, a fixing table and a hydraulic oil cylinder is arranged on the test table, so that a reverse osmosis membrane placed in the placing groove can be quickly clamped and fixed through the extrusion cover by virtue of the movement of the hydraulic oil cylinder, and the extrusion cover is connected to the fixing table through a threaded rod, so that different heights at different positions are avoided; fine adjustment can be carried out through rotation of the threaded rod, and a first spring piece is arranged in the containing groove.

The invention relates to the technical field of water treatment, in particular to a high-recovery-rate short-process salt-tolerant reverse osmosis system and treatment method.The system comprises a pretreatment unit, a sensor monitoring unit, a self-adaptive pressure-flow coupling control unit, an intelligent operation and maintenance unit and a gradient boosting reverse osmosis membrane set. According to the invention, ultrahigh recovery rate and desalination performance are realized, gradient boost membrane module design is combined with concentration polarization inhibition technology, membrane surface flow state distribution is optimized, osmotic pressure influence is significantly reduced, pressure-flow coupling control and concentrated water excess pressure energy recovery technology are integrated, energy dynamic cyclic utilization is realized, energy consumption is reduced, and the method is suitable for industrial production. By monitoring the membrane flux attenuation rate and the transmembrane pressure difference in real time and dynamically optimizing a pulse cleaning strategy, dynamic optimization of high-salinity wastewater treatment is realized, and the problems of low recovery rate, high energy consumption and quick membrane pollution in high-salinity wastewater treatment are solved.

The invention provides a method and system for salt separation, evaporation and crystallization of printing and dyeing wastewater, and the method comprises the following steps: sequentially carrying out multi-stage synergistic pretreatment on textile printing and dyeing wastewater to remove suspended solids, degrade organic matters and reduce hardness; the pretreated wastewater is subjected to membrane salt separation treatment, and preliminary separation of salt is achieved through reverse osmosis pre-concentration and nanofiltration salt separation; and respectively carrying out evaporative crystallization treatment on the separated high-concentration salt solution to obtain high-purity sodium sulfate and sodium chloride products. According to the method, the salt recovery rate and the product purity are remarkably improved, the energy consumption and the operation cost are reduced, meanwhile, the problems that in traditional printing and dyeing wastewater treatment, salt is difficult to separate, and the crystallization purity is low are solved, and an innovative solution is provided for high-valued resource recovery of industrial wastewater.

Provided are methods of extracting lithium from a lithium containing solution, as well as the resulting compositions. The method includes supplying a lithium containing solution to a lithium capture step, the lithium capture step being operable to capture lithium from the lithium salt containing solution. The method further includes recovering lithium from the lithium capture step to produce a lithium rich stream. In especially preferred methods, the lithium capture step is performed to increase the lithium to sodium ratio above at least 1:1. Optionally, the lithium rich stream can be purified to remove divalent ions and borate ions. The lithium rich stream is then concentrated by supplying the lithium rich stream to a reverse osmosis step to produce a concentrated lithium rich stream.

The invention relates to the technical field of reverse osmosis membranes, in particular to a polyamide reverse osmosis membrane for high-salinity wastewater treatment and a preparation method of the polyamide reverse osmosis membrane. The invention solves the problem that the polyamide reverse osmosis membrane cannot give consideration to both desalination rate and water flux. The polyamide reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone porous layer, a transition layer and a polyamide layer. The polysulfone porous layer is prepared, and the modified pore-forming agent is added to improve the water flux of the reverse osmosis membrane; the hydrophilicity of the reverse osmosis membrane is improved by preparing the transition layer and adding a hydrophilic auxiliary agent when the polyamide layer is prepared; the flux attenuation rate of the polyamide reverse osmosis membrane is reduced by preparing the polyamide layer; the desalination rate of the reverse osmosis membrane is improved by introducing a composite ion complexing agent and graphene quantum dots into the polyamide layer.

Described herein are methods of recovering lithium from dilute lithium sources. The methods include extracting lithium from an extraction feed using direct lithium extraction in an extraction stage to yield a lithium intermediate, performing one or more concentration operations, each concentration operation concentrating an input stream to yield an output feed, wherein the input stream is obtained from the lithium intermediate and / or the extraction feed is obtained from the output feed. At least one of the concentration operations includes a membrane separation operation having a plurality of reactors in series each having a semi-permeable membrane, such as a counter-flow reverse osmosis operation. Methods may also include generating a low TDS stream as a permeate from any of the one or more concentration operations, wherein the low TDS stream is recycled or used as fresh water.

The invention provides a hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane and a preparation method thereof, and the preparation method comprises the following steps: preparing a polyethersulfone hollow fiber ultrafiltration membrane: mixing sultone, aluminum chloride or tin chloride according to a set mass ratio to obtain a sultone stock solution; the method comprises the following steps: soaking a polyethersulfone hollow fiber ultrafiltration membrane in a sultone stock solution for a set time period, adding RO water to prepare a sultone solution, soaking for the set time period, transferring to an acid environment for cleaning, transferring the cleaned polyethersulfone hollow fiber ultrafiltration membrane to an alkaline environment for cleaning, and drying to obtain the polyethersulfone hollow fiber ultrafiltration membrane. Taking out the cleaned polyethersulfone hollow fiber ultrafiltration membrane, sequentially soaking the polyethersulfone hollow fiber ultrafiltration membrane with reverse osmosis water and a glycerol solution, and airing to obtain the hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane. The hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane which is high in hydrophilicity and uniform in sulfonation is obtained through sulfonation post-treatment of the polyethersulfone hollow fiber ultrafiltration membrane.

The invention discloses a method for directly extracting lithium from lithium-containing brine by adopting an adsorption process, which comprises the following steps of: feeding pretreated brine into a continuous countercurrent adsorption system comprising an N-stage continuous overflow adsorption stirring tank, and extracting lithium from the lithium-containing brine through N-stage continuous countercurrent adsorption, then the washed loaded adsorbent is fed into a continuous countercurrent desorption system containing M-stage continuous overflow desorption stirring tanks, and desorption of lithium is achieved through M-stage continuous countercurrent desorption; the lithium-rich liquid obtained through desorption is pretreated and then subjected to reverse osmosis, nanofiltration and further concentration, and finally the obtained concentrated liquid is prepared into the required lithium product. Compared with the traditional lithium extraction process, the method provided by the invention has the advantages of low equipment requirement, low investment, high adsorption and desorption rate, high adsorbent utilization rate and controllable desorption process, and can flexibly adapt to the change of lithium concentration and capacity of the brine.

The invention discloses a method for extracting lithium from gas field produced water with a high sodium-lithium ratio, and belongs to the technical field of chemical engineering. The mass ratio of sodium to lithium in the gas field produced water is (100-1000): 1, and the method comprises the following steps: S1, nanofiltration: carrying out nanofiltration on the gas field produced water, and intercepting divalent ions to obtain nanofiltration produced water and nanofiltration concentrated water; s2, adsorbing and extracting lithium, namely adjusting the pH value of the sodium-filtered produced water, treating the sodium-filtered produced water through a lithium-sodium adsorption and separation device filled with an adsorbent to realize sodium-lithium separation, and collecting the adsorbed lithium-extracted produced water; s3, desorption of lithium ions: eluting the adsorbent with an acid solution to desorb the lithium ions from the adsorbent, and collecting an eluent; s4, concentration: carrying out reverse osmosis treatment on the eluent, and treating the reverse osmosis concentrated solution through an electrodialysis device to obtain a concentrated lithium-containing concentrated solution; and S5, lithium precipitation: adjusting the pH value of the lithium-containing concentrated solution, adding a lithium precipitation agent, and crystallizing and precipitating lithium to obtain industrial-grade lithium carbonate. The process is simple, the lithium recovery rate during lithium precipitation can be effectively increased, and full-automatic continuous operation can be achieved.

The invention discloses a regulation and control method for stably improving the water quality of water produced by a reverse osmosis system of a power plant, and relates to the field of water quality regulation and control, which comprises the following steps: configuring a water inlet flow regulation device, performing initial setting, configuring the position of an online sensor, performing data acquisition, setting judgment rules of turbidity, differential pressure and transmembrane pressure difference, and determining the water quality. And configuring a flocculant adding device and adding control logic, configuring a backwashing and adding linkage control state machine, and carrying out data smoothing, trend analysis and self-adaptive threshold adjustment. When the water quality of the raw water fluctuates for a short time or the pollution load is increased, dynamically adjusting the water inlet flow, the backwashing intensity and the flocculant adding concentration based on parameters such as turbidity, pollution index, conductivity and pressure difference which are acquired by an online sensor in real time; and meanwhile, the concentrated water reflux proportion and the high-pressure pump frequency are automatically corrected by continuously calculating the desalting rates of the first-stage and second-stage reverse osmosis devices, so that the running state of the membrane component is kept in an optimal interval.

The invention relates to the technical field of ammonia water preparation, in particular to a raw water reverse osmosis treatment device for ammonia water preparation, which comprises a shell, the shell is formed by fixing an upper shell and a lower shell, a water inlet pipe is fixed in the middle of the top of the shell, a high-pressure water inlet component is arranged at the top of the water inlet pipe, and a concentrated water outlet pipe is fixed in the middle of the bottom of the shell. A drain valve is fixedly mounted at the bottom of the concentrated water outlet pipe; and the water pressure stabilizing assembly is arranged at the top of the inner wall of the shell. A multi-level pressure regulation and control mechanism is constructed in the reverse osmosis process, the problem of instantaneous pressure impact when the high-pressure pump is started is solved, physical damage to the membrane is avoided, a dual anti-blocking system of active rotary cleaning and back flushing is constructed, the membrane blocking probability is greatly reduced, meanwhile, the impact force of water flow is fully weakened in the back flushing stage, and the reverse osmosis efficiency is improved. It is ensured that the reverse osmosis membrane bears stable pressure all the time, and the problem of secondary damage to the reverse osmosis membrane caused by too large instantaneous pressure in the backwashing stage is avoided.