214results about How to "Good desalination effect" patented technology

The invention discloses a polysulfonamide nanofiltration or reverse-osmosis composite membrane, and a preparation method thereof. the preparation method for the polysulfonamide nanofiltration or reverse-osmosis composite membrane comprises the following steps: pretreatment of a porous supporting membrane; alternate layer-upon-layer assembling of a sulfonyl chloride organic-phase solution and a polyamine water-phase solution on the surface of the porous supporting membrane via reaction; heat treatment; etc.; wherein heat treatment can be carried out during or after layer-upon-layer assembling. Nanoparticles, a surfactant, a catalytic acid absorbent or catalyst, a pore forming agent and other additives are added into the sulfonyl chloride organic-phase solution and the polyamine water-phase solution. The polysulfonamide nanofiltration or reverse-osmosis composite membrane prepared by using the method has improved desalination performance and acid resistance, smoother surface and lower roughness compared with composite membranes prepared through traditional interfacial polymerization, and has good application prospects in the fields of nanofiltration and reverse osmosis.

The invention relates to a compound demulsifier and a use method thereof. The compound demulsifier comprises alkyl ester of styrene-maleic anhydride copolymer and ethylene oxide-propylene oxide block polymer, the mass ratio of which is 0.1 to 10: 1. The compound demulsifier of the invention, through compound use of the alkyl ester of styrene-maleic anhydride copolymer and the ethylene oxide-propylene oxide block polymer, can achieve better demulsification effect and is particularly applicable to the demulsification and dehydration of high-asphaltene viscous oil.

The invention discloses a method for removing salt by using a fluid battery and application thereof. According to the method, salt removal is performed by a salt-removing fluid battery device, whereinthe salt-removing fluid battery device uses a positive active material as a positive electrode of the fluid battery, a negative active material as a negative electrode of the fluid battery and a saltsolution as an intermediate fluid electrolyte of the fluid battery. According to the invention, organic or inorganic active materials are used as the positive and negative electrode materials of thefluid battery, a salt-removing fluid battery is built in a fixed order, and the salt removing purpose is achieved through charging and discharging; during charging, through respective redox reactionsof the organic active positive and negative electrode materials, under an interfacial effect of an ion exchange membrane, electrodialysis is coupled to remove anions and cations in the salt solution,so that the purposes of removing the salt and removing other ions are achieved. The salt-removing fluid battery used in the invention is simple, low in cost and environment-friendly, shows excellent electrochemical performance, good cycle stability and salt removing capacity, and is applicable to the field of seawater salt removal and the like.

The invention discloses bitter saline water desalination equipment, which comprises a raw water tank, and a high pressure pump, a reverse osmosis membrane component and a drinking water tank which are sequentially connected. The bitter saline water desalination equipment further comprises a physical-chemical program controlled composite coupling preprocessor consisting of a raw water pump, a laminated filter and a program controlled ultrafiltration device which are sequentially connected. The bitter saline water desalination equipment has the advantages that the process of physical-chemical program controlled composite coupling preprocessing filtration is adopted so that the raw water with different types and different qualities can be pretreated to meet the inlet water requirement for the reverse osmosis membrane component, thus the inlet water quality for the reverse osmosis desalination is improved, the rubber body pollution and the microorganism pollution to membrane elements in the reverse osmosis membrane component are prevented, the unit area permeation flux of the reverse osmosis membrane component is improved, and the protection of the reverse osmosis membrane elements is increased; at the same time, the chemical cleaning frequency of the reverse osmosis membrane elements is reduced, the service life of the membrane elements is prolonged, the operating cost is reduced, and the production efficiency is improved.

The invention relates to a method of preparing pure water using metallurgic sewage which comprises the following steps, (1) reclaiming sewage water, preparing recycled water, wherein the water outlet suspended matter <100mg / l, (2) treating the recycled water, subjecting the recycled water to fine grid filtration, sterilizing, micro-flocculation, entrapping hairs, making the COD <30mg / l, (3) ultra-filtration treatment, passing the recycled water through external pressured immersion type ultra-filtration apparatus for treatment, meeting the requirement of SDI<2, (4) reverse osmosis desalination treatment, loading the ultrafiltrated water into reverse osmosis apparatus for desalinization treatment.

The invention discloses a UiO-66-NH2 composite material as well as a preparation method thereof and an application of the composite material in seawater desalination. The UiO-66-NH2 composite materialcomprises a carrier modified by 3-aminopropyltriethoxysilane and a UiO-66-NH2 film layer, wherein the UiO-66-NH2 film layer is covalently attached to the carrier. According to the preparation methoddisclosed by the invention, the carrier modified by the 3-aminopropyltriethoxysilane is placed into a UiO-66-NH2 film reaction solution for a reaction to obtain the UiO-66-NH2 composite material; andthe UiO-66-NH2 composite material disclosed by the invention has the simple preparation method and excellent seawater desalination treatment performance, and is suitable for large-scale promotion.

The invention discloses a production method of a low-salt oyster polypeptide and oligosaccharide nutrition powder. According to the production method, oyster obtained via shell removing is taken as a raw material, is repeatedly immersed in ice water at 4 to 10 DEG C for 2 to 4h; the oyster obtained via immersion desalting is subjected to slurry homogenizing, and is subjected to high temperature treatment for disinfection and protein denaturation; obtained oyster slurry is cooled with normal temperature water; pH value is adjusted to be 7.0 to 9.0, and 0.5 to 1.0wt% of protease is added for protein enzymatic hydrolysis; after high pH protease enzymatic hydrolysis, the temperature is adjusted, and 0.5 to 1% of a weakly acidic protease is added for enzymatic hydrolysis; amylase is added for degradation of glycogen; an obtained product is subjected to high temperature treatment, filtering, and spray drying so as to obtain the oyster polypeptide and oligosaccharide nutrition powder. The production method is simple; cost is low; and the obtained oyster polypeptide and oligosaccharide nutrition powder can be absorbed by human body easily.

The present invention relates to a method capable of making auxiliary desalination by adopting ultrasonic technique before sea-water vegetable fresh-keeping and dehydration processing treatment, belonging to the field of sea-water vegetable food processing technology. Its main processing process includes the following several steps: selecting raw material, washing, scalding and inactivating enzyme (protecting color), freezing, desalination, flavouring, fresh-keeping or dehydration and packaging. Before the sea-water vegetable fresh-keeping treatment and dehydration said invention adopts and ultrasonic auxiliary desalination new process so as to make the sea-water vegetable finished product have good desalination effect (its desalination rate can be up to 30%-60%).

The invention discloses a liquid fertilizer for drip irrigation for a saline and alkaline inland. The liquid fertilizer comprises the following components: 20 to 40 parts of fulvic acid extracted by microbial fermentation, 20 to 30 parts of urea, 5 to 10 parts of ammonium polyphosphate, 10 to 20 parts of potassium dihydrogen phosphate, 2 to 5 parts of an inorganic additive, 2 to 3 parts of ferrous sulfate, 2 to 3 parts of zinc sulfate, 2 to 3 parts of manganese sulfate, and 0.5 to 1 part of 15 to 20wt% plant growth regulator ethanol solution. The pH value of the fertilizer is 3.5 to 4.0. The liquid fertilizer for drip irrigation provided by the invention has the advantages of effectively reducing the pH value of crop rhizosphere soil, improving the bioavailability of soil nutrients, achieving the balanced supply of water and nutrients, and improving the water and fertilizer use efficiency.

The invention discloses a CDI (Capacitive Deionization) based compound type constructed wetland desalination system. The technical scheme of the invention is that a pretreatment system in the compounded type constructed wetland desalination system is connected with a compound vertical flow constructed wetland system by virtue of a pipeline. The pretreatment system is that: the water inlet and the water outlet of a grille (22) are communicated with the water inlet of a corresponding first pressure pump (23) and the water inlet of a CDI device (3) by virtue of pipelines, andthe water outlet of the CDI device (3) is communicated with the water inlet of a compound vertical flow constructed wetland and the water inlet of a salt drying plate (9) respectively through pipelines.A bottom impervious layer (18) of the compound vertical flow constructed wetland system is sequentially provided with a gravel layer (17), a biological ceramisite layer (13), a zeolite layer (12) and a soil layer (11) upwards, the constructedwetland is uniformly separated into 2n+1 vertical flow treatment tanks (7)along the left and right direction, and the tops and the bottoms of the vertical flow treatment tanksare communicated with one another in a staggered manner. The CDI based compound type constructed wetland desalination system disclosed by the invention is environmentallyfriendly, can effectively solve the problem of clogging and saturation of the soil layer of the wetland, and is good in nitrogen and phosphorus removal effect and desalination effect.

The invention relates to a method for preparing a carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode, which belongs to the field of the capacitance desalination electrode preparation. The method comprises the following steps that: firstly, graphite oxide / carbon nanometer tube high-stability dispersing liquid is obtained, and the graphite oxide / carbon nanometer tube compounds are fast peeled at a low temperature to obtain carbon nanometer tube / graphene three-dimensional nanometer compound materials. The carbon nanometer tube / graphene three-dimensional nanometer compound materials and polytetrafluoroethylene emulsion are uniformly mixed and coated on graphite paper, the carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode is prepared after being baked. The method has the advantages that the temperature is low, simplicity is realized, and the operation is easy. The obtained carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode has good conductivity and better desalination performance, and potential prospects are realized in the capacitance desalination aspect.

The invention discloses a zero-emission system for treating landfill leachate. The zero-emission system comprises a primary sedimentation tank, an adjusting tank, a hydrolytic acidification tank, a UASB (Upflow Anaerobic Sludge Blanket) reactor, an A / O-MBR (Membrane Bioreactor) system, an MBR membrane water production tank, a nano-filtration (NF) device, a nano-filtration freshwater water production tank, an electrodialysis system, an electrodialysis freshwater tank and an RO (Reverse Osmosis) device, which are connected in sequence, wherein an output end of the RO device is connected with a reverse osmosis concentrated water tank and a reverse osmosis freshwater tank. A treatment technology with the primary sedimentation tank, the adjusting tank, the hydrolytic acidification tank, an efficient anaerobic reactor, the A / O-MBR system, an NF system, electrodialysis and an RO system is adopted, and organic matters and ammonia nitrogen in the leachate can be effectively degraded; a frequentreverse system of the electrodialysis is applied and a high desalting rate can be realized; a concentrated water reduction system combining chemical softening and a membrane is adopted to reduce therigidity of a concentrated solution and improve the total recovery rate; the whole technology has the advantages of low treatment cost, less investment, stable operation and high operability, and zeroemission of landfill leachate treatment is realized.

The invention relates to a preparation method of a carbon nano-tube / mesoporous-carbon composite capacitance-type desalting electrode, which belongs to the preparation field of capacitance-type desalting electrodes. The preparation method comprises the following steps of: adding a carbon nano-tube into a precursor of a mesoporous material, uniformly dispersing by utilizing ultrasonic and magnetic stirring, and forming a high-molecular compound with the mesoporous material around the carbon nano-tube through curing; carbonizing through inert-gas protection to obtain carbon nano-tube / mesoporous-carbon composite-mateiral powder with ordered height and large specific surface area; and finely grinding a sample, smearing the sample onto graphite paper after being mixed with a polytetrafluoroethylene emulsion, and drying to prepare the carbon nano-tube / mesoporous-carbon composite capacitance-type desalting electrode. The preparation method has a simple process and easily-controlled conditions. A carbon nano-tube electrode prepared by the method disclosed by the invention has good electrical conductivity and better desalting performance and has potential application prospects in the aspectof capacitance-type desalting.

The invention discloses a method for preparing a titanium dioxide slurry. The method comprises the following steps: pulping a titanium dioxide base material to obtain a titanium dioxide protoplasm; mixing and stirring the titanium dioxide protoplasm and an aluminum-containing compound to make the surfaces of titanium dioxide base material particles of the titanium dioxide protoplasm coated with an aluminum film in order to obtain aluminum coated titanium dioxide particles; adjusting the pH value of the slurry for coating the aluminum film to be less than 7 in order to obtain a pH value adjusted slurry; carrying out press filtration treatment on the pH value adjusted slurry to obtain a filter cake; and carrying out mixing and pulping treatment on the filter cake and a dispersant to obtain the titanium dioxide slurry. The method reduces or shields hydrogen bonds on the surfaces of the titanium dioxide base material particles through coating the surfaces of the titanium dioxide base material particles, so the titanium dioxide base material particles easily undergo solid-liquid separation to form the filter cake, sodium chloride is effectively removed, and the viscosity of the titanium dioxide slurry is reduced.

The invention discloses a method for preparing a hydrophobic porous wollastonite ceramic membrane for desalination by taking high-silicon high-calcium industrial solid waste as a raw material throughtape casting, belongs to the technical field of desalination, and aims to prepare the hydrophobic porous wollastonite ceramic membrane for membrane distillation desalination by taking high-silicon high-calcium solid waste as the raw material through low-cost tape casting. The method comprises the following steps: cleaning the solid waste with deionized water to neutrality, and activating the solidwaste; preparing a wollastonite raw material from the activated high-silicon high-calcium solid waste, activated calcium oxide and activated silicon dioxide in a mass ratio that the ratio of CaO: SiO2: solid waste is 13.6%: 35%: 51.4% (in mass percentage); mixing and ball-milling the wollastonite raw material, a binder that is polyethersulfone (PESf), a dispersant that is polyvinylpyrrolidone (PVP) and an organic solvent that is N-Methyl pyrrolidone (NMP), performing vacuum degassing, tape casting and phase inversion to obtain a ceramic membrane blank; then calcining, and finally modifying the blank with a hydrophobic agent to obtain the porous wollastonite ceramic membrane. The porous wollastonite ceramic membrane has a uniformly distributed pore structure, high hydrophobicity, high saltremoval rate and high salt removal flux.

The invention discloses a separating and purifying method for liraglutide, and belongs to the technical field of separation and purification. The separating and purifying method for the liraglutide comprises the following steps: dissolving a liraglutide crude product in dilute ammonia water which contains 4-6% of an organic solvent to obtain a crude peptide solution; filtering; enabling filtrate to separately pass through polymethacrylate polymer filler and octadecylsilane bonded silica gel filler, carrying out separation and purification in combination with purification conditions of different systems, and collecting a target product to finally obtain a product of which the total purity is 99.5% or above and the maximum single impurity is less than 0.1%. The method is simple, is high in yield and purity, and is quite suitable for batched production.

The invention relates to the technical field of medicine purification, and in particular discloses a method for purifying high-quality acarbose. The method comprises the following steps: removing cation salt of a pretreated fermented acarbose liquid by using a cation resin column, performing top washing by using a diluted hydrochloric acid solution so as to elute a small amount of acarbose adsorbed in the resin, and removing anions by using a common method. By adopting the method, the problems that a conventional process is poor in salt removing effect so that the pretreated fermented acarbose liquid needs to be purified with the cation resin column for multiple times, too long in production cycle, low in acarbose yield, large in use amount of an elution solvent, severe in environment pollution and unbeneficial to industrial large-scale production can be solved. The acarbose prepared by using the method is high in purity, stable quality and medicine use safety of the acarbose can be ensured, moreover a great deal of production cost of industrial large-scale production can be reduced, outstanding economic benefits can be made, and sustainable development of companies can be facilitated.

The invention relates to a preparation method of a nano silver modified polypropylene material for an electrodialyzer clapboard network. The preparation method comprises the following steps of: 1, modifying nano silver to obtain modified silver; 2, carrying out nano silver modification on polypropylene by using the modified nano silver obtained in the step 1. The nano silver modified polypropylene material clapboard network prepared by adopting the method has high flexibility and high strength as well as excellent bactericidal activity, thereby preventing microorganisms in an electrodialyzer from propagating, solving the problems of dirt blockage and the like of biological sludge of the electrodialyzer, improving desalination effect of the electrodialyzer, and prolonging service life.

The invention provides an agent and a method for surface treatment on a nanofiltration membrane. The agent for surface treatment comprises 0.01 to 10wt% of antibacterial nano-particles, 0.1 to 30wt% of one or more active agents and the balance one or more solvents. A preparation method of the agent comprises the following steps of dispersing the antibacterial nano-particles in the one or more solvents, stirring at a temperature of 20 to 40 DEG C until uniform dispersion, adding the one or more active agents into the mixed solution, and stirring for 1 to 10 hours until dissolution to obtain the agent for surface treatment on a nanofiltration membrane. The method for surface treatment on a nanofiltration membrane comprises the following steps of 1, coating or dipping of the agent for surface treatment on a nanofiltration membrane, 2, air-knife surface drying, and 3, drying in an oven. The agent and the method for surface treatment on a nanofiltration membrane have the advantages that a high desalinization rate is maintained and a nanofiltration membrane treated by the agent and the method has high flux under low pressure so that a nanofiltration membrane product having excellent flux performances and good desalination effects is obtained. The agent has high efficiency, can be operated easily, and has low equipment requirements and strong practicality.

The invention belongs to the technical field of agriculture and particularly relates to a biological improvement method of saline-alkali land. The method is implemented by combining a biological improvement agent and ground mulching, and the microorganism improvement agent can neutralize soil salt and alkali, lower the soil salt content and further has the multiple functions of phosphorus-dissolving, potassium-dissolving, nitrogen fixation and the like, so that other microorganisms in soil are activated, soil nutrients and varieties of the microorganisms are increased, and effectiveness of unavailable nutrients in soil is promoted.

The present invention discloses a water-absorption desalination composite material for soil relic desalination, wherein a modifier is uniformly dispersed in a starch grafted acrylamide polymer to obtain the composite material, the modifier is kaolin, a molecular sieve, alumina or silica gel, the modifier content in the composite material is 1-40 wt%, and the preparation method of the starch grafted acrylamide polymer comprises: adding starch to deionized water, continuously stirring to make the starch be uniformly dispersed in the deionized water, carrying out a gelatinization treatment on the system under nitrogen protection until the system presents a translucent colloid state, cooling, adding an initiator to initiate a reaction, adding a cross-linking agent, and carrying out grafting polymerization on the reactants under nitrogen protection so as to obtain the gelatinous starch grafted acrylamide polymer. The present invention further discloses applications of the composite material in desalination of the soil relic surface containing soluble salts. With the material of the present invention, the removal efficiency of the soluble salts is effectively improved.

The invention belongs to the field of coal chemical processes, and in particular relates to a coal tar desalination process which comprises the following steps: filling desalted water into coal tar, heating to 85-95 DEG C, performing first-stage dehydration by using a horizontal screw centrifuge to remove solid phase of which the particle size is greater than 50mu m, dehydrating until the water content is less than 2%, performing second-stage dehydration by using a flottweg separator so as to remove solid phase of which the particle size is within 5-50mu m, dehydrating until the water content is 0.5% or below, and performing hydrotreating on the treated coal tar. The coal tar desalination process provided by the invention is good in desalination effect, and stable to operate, the desalination rate is greater than 99.5%, the temperature is lower than that of electric desalination, the process is easy to operate, salt decomposition can be avoided, the problem that an oil-water interface cannot be completely separated in a conventional electric desalination process can be avoided, and the problem that an electric desalination tank has sedimentation and scaling can be also avoided.

The invention discloses a method for preparing a hydrophobic porous cordierite (2MgO.2Al2O3.5SiO2) ceramic membrane for desalination from high-silicon industrial solid waste as a raw material at a lowcost and belongs to the technical field of desalination. The hydrophobic porous cordierite ceramic membrane prepared from the high-silicon industrial solid waste as the raw material at a low cost isapplied to membrane distillation desalination. Firstly, the solid waste is cleaned with deionized water and then calcined; a cordierite material is prepared from the calcined solid waste, activated magnesium hydroxide, aluminum oxide and kaolin in the ratio of MgO, Al2O3, SiO2 and kaolin being 14%:25%:45%:16% (in percentage by mass); besides, a certain amount of starch is added, the mixture is subjected to ball milling, drying, crushing and sieving, obtained powder is pressed into sheets, then, calcination is performed, and finally, the hydrophobic porous cordierite ceramic membrane is obtained through hydrophobic modification. The ceramic membrane has good pore structures, hydrophobicity, salt removing rate and flux.

The invention provides an antihypertensive peptide derived from adductor muscle of mytiloida. The preparation steps are as follows: 1) preprocessing; 2) enzymolysis; 3) ultrafiltration; 4) purifying; and 5) drying. The beneficial effects are as follows: inorganic salt, metal ion and other micro-molecular water-soluble impurities and grease are removed in the manner of soaking with deionized water; the enzymolysis condition is mild and the antihypertensive peptide is not damaged; compound enzyme hydrolysis is adopted, the enzymolysis is sufficient, the acquired molecular weight is low, the antihypertensive peptide is easily absorbed by human bodies and the protein loss is prevented; when a centrifugal ultra-filtration pipe is used for extracting the antihypertensive peptide, no concentration gradient exists, the separation speed is high, the protein loss is avoided, the desalination effect is good, and the extraction rate of the antihypertensive peptide is high; through ultra-filtration again, the other proteins with the molecular weight of more than 30-50KD can be effectively removed, the antihypertensive peptide can be further purified and the acquired antihypertensive peptide is high in purity; the invention has the advantages of simple operation steps, advanced production technique, controllable product quality, low cost and high economic benefit.

The invention provides a takyr solonetz improvement method. A physicochemical soil improvement method, a method of salt elimination by irrigation and a crop cultivation method are integrated, an improver and fertilizer are applied to soil to condition the physicochemical properties of the soil, the soil structure is improved, ion exchange conditions are effectively provided and migration of soil salt is accelerated in cooperation with a measure of salt elimination by irrigation, soil desalination is facilitated, the physicochemical soil properties and structure can be effectively improved in cooperation with planting of saline-alkali tolerant plants, the permeability is improved, and leaching of soil salt is facilitated; the technical problems that soil absorbs water and expands and pores are choked with silt due to soil granule dispersion after irrigation, mud is not permeable, salt is difficult to rapidly leach, soil shrinks and hardens when soil dries, and the migration speed of soil salt under the leaching condition is low are solved. The method is favorable to development and utilization of saline-alkali soil resources in China and has remarkable economic, social and ecological benefits.

The invention discloses an electrostatic desalination testing device. The electrostatic desalination testing device comprises a direct-current voltage-stablizing power supply, a magnetic force heating stirrer, a conductivity determinator, a liquid storage container and an electrode module, wherein the upper part of the liquid storage container is open and the liquid storage container is filled with a water sample; the liquid storage container is put on the magnetic force heating stirrer. According to the testing method of the electrostatic desalination testing device, the interval between two electrode plates is adjusted by a telescopic rod; the voltage is regulated by the direct-current voltage-stablizing power supply; the magnetic force heating stirrer is adopted so that the water sample fully flows in the liquid storage container; the conductivity determinator monitors the conductivity of the water sample in the liquid storage container, and a curve graph which shows the change of the conductivity with time is drawn, thereby obtaining the optimal voltage and the optimal interval between the electrode plates. The electrostatic desalination testing device is simple in structure, is simple and convenient to operate, and is good in adsorption of the electrode module, and can be used for measuring the optimal voltage and the optimal interval between the electrode plates under the optimal desalination effect by regulating the applied voltage and the interval between the electrode plates.

The invention relates to a three-dimensional oxidized graphene frame film and a preparing method and application thereof. Particularly, the invention discloses a three-dimensional oxidized graphene frame film used for sea water desalination, the frame film comprises an oxidized graphene film layer modified by p-phenyl diisocyanate (PDI) and an optional porous alumina tubular carrier used for loading the oxidized graphene film layer modified by p-phenyl diisocyanate (PDI), and the porous alumina tubular carrier is modified by PDI. The invention further discloses the preparing method and application of the frame film. The frame film has the advantages that the preparation process is simple, the thickness and the interlayer spacing are controllable, and the frame film is uniform and dense, high in stability in water and excellent in sea water desalination performance and can greatly promote development of the sea water desalination technology.

The invention discloses a self-cleaning seawater desalination device which comprises a water inlet module, a membrane treatment module, a water collecting module, a condensing module and a water circulation module. The water inlet module is used for removing Ca<2+> ions and Mg<2+> ions in the seawater, and the seawater without ions is led to the membrane treatment module. The membrane treatment module adopts a PVDF hydrophobic microporous membrane coated with a nano photocatalyst active layer as a filter membrane, the seawater introduced by the water inlet module is heated by using a heating unit to form water vapor, the water vapor enters a cavity formed by the membrane by penetrating through the PVDF hydrophobic microporous membrane and then is condensed and liquified to form fresh water. The water collecting module is used for collecting the fresh water in the membrane treatment module. The condensing module is used for refrigerating the fresh water led from the membrane treatment module and then forming cold water. The water circulation module is used for water circulation of the whole device. The invention further discloses a self-cleaning seawater desalination method. The self-cleaning seawater desalination device is self-cleaning, low in cost, good in effect, convenient, simple and practical.

The invention discloses an operation method of a multistage oil-water separation tank of an intelligent pulse electrostatic coalescence electrode. The amount of high-water-content crude oil in an oil-water separation chamber is continuously increased, so that the liquid level continuously rises; the liquid level of the high-water-content crude oil sequentially enters a first-stage electrostatic coalescence oil-water separation area, a second-stage electrostatic coalescence oil-water separation area, a third-stage electrostatic coalescence oil-water separation area, a fourth-stage electrostaticcoalescence oil-water separation area and a fifth-stage electrostatic coalescence oil-water separation area upwards; the purpose of controlling the electric quantity of an electrostatic field in eacharea is achieved by adjusting the electric quantity on the first insulating electrode and the second insulating electrode through a controller, after water-containing crude oil enters the electrostatic field, water drops in the water-containing crude oil are polarized and deformed under the action of electrostatic field force, small water drops are coalesced into large water drops to settle downwards, and it is guaranteed that the water content of the separated crude oil is greatly reduced; the problems of low dehydration rate and high oil content in drained water of a secondary separator aresolved by adding the electrostatic fields, the dehydration efficiency is effectively improved, and the production cost is reduced.