55 results about "Seawater reverse osmosis" patented technology

A desalination process is disclosed which combining two or more substantially different water treatment processes in a unique manner to desalinate saline water, especially sea water, to produce a high yield of high quality fresh water, including potable water, at an energy consumption equivalent to or less than much less efficient prior art desalination processes. In this process a nanofiltration step is synergistically combined with at least one of sea water reverse osmosis, multistage flash distillation. multieffect distillation of vapor compression distillation to provide an integrated desalination system by which sea water can be efficiently and economically converted to high quality potable water in yields which are at least 70%-80% greater than the yields available from the prior art processes. Typically a process of this invention using the nanofiltration initial step will produce, with respect to sea water feed properties, calcium, magnesium, sulfate and bicarbonate ion content reductions of 63%-94%, pH decreases of about 0.4-0.5 units and total dissolved solids content reductions of 35%-50%.

The present invention discloses a desalination plant that operates with a sea water or brackish water feed and produces a concentrated and selectively improved salt reject stream and a pure water permeate stream from a first treatment section that is arranged to produce primarily water at high recovery using membrane desalination processes. The reject stream from the first treatment line has a component distribution that is substantially reduced in native di- and polyvalent scaling ions, essentially depleted of sulfate, has substantially higher total dissolved solids than a traditional sea water reverse osmosis reject, yet is suitable for thermal treatment processes. The system may be enhanced by monovalent salt components. The unit may be integrated with a second treatment section, in which the first reject stream is further concentrated, purified, and processed to produce a high purity salt product.

An optimal two stage NF2 membrane pretreatment unit is synergistically combined with a following two stage SWRO2 desalination unit, where each of the two stage NF2 and SWRO2 has an energy recovery device (ERD) turbocharger (TC) in between the stages to form a dual hybrid of NF2-SWRO2 (FIG. 1 ); alternatively the two stage NF2 unit is synergistically combined with one stage ERD equipped SWRO, unit operated at up to 85 bar (FIG. 2 a, b); or the two stage NF2 unit combined with one stage ERD equipped SWRO1 unit, with part of its reject recycled constituting part of the feed to the NF units (FIG. 3 a,b). The process of this invention raises significantly the product water recovery ratio, producing SWRO hybrids that exceed all prior arts in efficiency, including water yield, product recovery ratio, dramatically reduces both the energy consumption and water production unit cost.

The invention discloses a seawater desalinating technique through film integrated method, which comprises the following steps: passing the seawater through self-rinsing filter; predisposing the rinsed seaward into hyperfilter device; boosting the seawater through the boost pump; removing possible micro-particle in the inlet water of counter-osmosis system of the seawater through seawater safety filter; elevating the inlet pressure of the counter-osmosis system of the seawater; desalinating through counter-osmosis system of the seawater; removing micro-particle in the inlet water of counter-osmosis system of the fresh water through fresh water safety filter; elevating the inlet pressure of the counter-osmosis system of the fresh water; desalinating through counter-osmosis system of the fresh water. The invention reduces the adding quantity of the chemicals and rinsing times of reverse osmosis membrane effectively, which improves automatic degree with stable property and small equipment occupying area.

The invention relates to a novel membrane-process sea water desalination and fresh water and salt preparation system and technique. The novel membrane-process sea water desalination and fresh water and salt preparation system comprises a raw water tank, an ultrafiltration device, an ultrafiltration water tank, a sea water reverse-osmosis desalination device, a water production tank, an electroosmosis salt and water separation device and a concentrated salt water tank, wherein the raw water tank, the ultrafiltration device, the ultrafiltration water tank, the sea water reverse-osmosis desalination device and the water production tank are connected sequentially through pipelines or pipelines and pumps. The sea water reverse-osmosis desalination device, the electroosmosis salt and water separation device and the concentrated salt water tank are sequentially connected through pipelines. By the aid of the technique, high-quality refined salt or salt chemical raw materials and high-quality fresh water can be produced, and meanwhile, adverse effects on the ecological environment of the sea area from discharge of SWRO (sea water reverse osmosis) concentrated salt water are avoided, costs for salt manufacturing by sea water and sea water desalination can be greatly reduced, and particularly, the novel membrane-process sea water desalination and fresh water and salt preparation system has high use value for water-deficient regions in northern of China.

The invention discloses a seawater desalination, resource comprehensive utilization and zero discharge processing system. The system comprises an ultrafiltration (UF) system, a seawater reverse osmosis (SWRO) system, a deionized water processing system, namely an UPW system, a mechanical compression system capable of preventing scaling and a salt manufacturing and salt chemical engineering system, wherein the UF system is used for generating pure seawater; the SWRO system is used for generating desalted water and concentrated seawater; the concentrated seawater can be produced into calcium sulfate, sodium chloride, potassium chloride, magnesium sulfate, bromine, magnesium chloride and steam condensed water by virtue of the mechanical compression system and the salt manufacturing and salt chemical engineering system; and the steam condensed water and a part of desalted water flow into the UPW system to generate deionized water. According to the processing system, the relevant projects of seawater desalination, energy source utilization, industrial salt manufacturing and salt chemical engineering are organically combined, so that reasonable allocation and utilization of resources are realized, and the aims of energy conservation, emission reduction, circular economy and zero discharge are fulfilled.

The invention relates to the technical field of reverse osmosis membrane modification and especially relates to a metal organic framework reverse osmosis membrane and a preparation method thereof. According to the metal organic framework reverse osmosis membrane disclosed by the invention, a metal organic framework and a polymer function layer are combined; a high flux and low energy consumption seawater membrane with a reverse osmosis membrane thickness as 100nm can be prepared through preparation steps of a polymer supporting player, a metal organic framework nanoparticle, a seawater membrane function layer and the like and by adjusting technological parameters in a preparation process. By means of existence of the metal organic framework, a lot of hydrogen bonds are provided for the function layer; the metal organic framework further can perform crosslinking condensation polymerization with free amino in the function layer, so that a crosslinking degree of the reverse osmosis membrane is improved. The seawater reverse osmosis membrane has a thinner membrane thickness, and manufacturing cost is greatly saved; more importantly, under the premise that a salt removing rate is not affected, membrane flux is greatly improved; thus, operation energy consumption of the seawater membrane is reduced, and the low energy consumption seawater membrane has excellent performance.

The invention relates to the field of seawater desalinization, in particular to a wind-power complementary pneumatic seawater desalting device, which comprises a pneumatic water pressure booster pump, an electric water pump, a gas pipeline and a wind-driven air compressor unit. The air compressor unit comprises a cabin, a wind turbine impeller mounted in the front part of the cabin, and an impeller main shaft, an accelerating gearbox, a coupler and an air compressor fixedly connected with each other in sequence and mounted in the cabin. Output compressed air of the air compressor is communicated with the pneumatic water pressure booster pump via the gas pipeline. The air compressor is driven directly by wind power to generate the compressed air, and the compressed air is used as the main power of the pneumatic water pressure booster pump for performing seawater reverse osmosis desalination; and when the wind power is inadequate or no wind exists, the electric water pump can be startedproperly to pressurize in order to guarantee the operation of a seawater desalting facility. The invention is applied to reverse osmosis seawater desalination and reduces the electric energy consumption, and has the advantages of saved investment, high efficiency, low operation and maintenance cost and the like, and is particularly suitable for many islands and coastal areas.

The invention discloses a seawater reverse osmosis desalination and seawater concentration method by using concentration polarization and a periodic instantaneous flushing principle. The method comprises the following steps: extracting pre-treated seawater from a seawater tank by using a seawater pump through an opened seawater inlet electric adjusting valve and a seawater inlet electromagnetic valve, and then feeding the extracted seawater into a reverse osmosis membrane core, wherein along with the fact that fresh water in the seawater is reversely permeated to a fresh water area from the reverse osmosis membrane core gradually, the later the section of the reverse osmosis membrane core is, the higher the concentrations of impurities and salts in the seawater are. A computer controller adjusts a concentrated seawater electromagnetic valve according to a data signal given by a seawater concentration test sensor, and adjusts the outflow volume of the concentrated seawater to control the concentration of the concentrated seawater within a set value range; the reverse osmosis membrane core is vibrated, so that the impurities and salts are not easily attached to the reverse osmosis membrane core; fresh water in the closed fresh water area is pressurized periodically and instantaneously by compressed air, and fresh water penetrates through the reverse osmosis membrane core to flush the reverse osmosis membrane core, so that micropores of the micropore are maintained smoothly all the way.

The invention discloses a coupling device for a sea water reverse osmosis system and a refrigeration system and an operating method of the device, belonging to the technical fields of sea water desalinization and air-conditioning refrigeration. The coupling device is composed of a sea water reverse osmosis system, a refrigeration system and a power system, wherein an energy recovery device of the sea water reverse osmosis system is coupled with the power system through a clutch; an open-type compressor of the refrigeration system is coupled with the power system through a clutch; and the refrigeration system is coupled with the sea water reverse osmosis system through the power system. The device disclosed by the invention can heat sea water entering a preheating processor by utilizing excess heat recovered by a prime motor cylinder liner, so that the temperature of the sea water entering the preheating processor is kept within the range of 25-30 DEG C, thereby enhancing the work efficiency of the reverse osmosis membrane; and since the sea water reverse osmosis system is coupled with the refrigeration system driven by the prime motor, the prime motor can still operate under rated conditions, thereby preventing the prime motor from operating in a low-load region or even in an idle region, and enhancing the thermal efficiency of the prime motor.

The invention belongs to the technical field of treatment of desulfurization wastewater and particularly provides a membrane separation combination zero-emission system for deeply treating desulfurization wastewater with a whole membrane method. The system comprises a pretreatment water tank, a water quality regulating water tank, a first reaction tank, a sedimentation water tank, a second reaction tank, a concentrated water tank, an TMF (tubular micro-filtration) assembly, a produced water tank and an NF (nanofiltration) assembly which are sequentially communicated through a pipeline, wherein a produced water outlet of the NF assembly is connected and communicated with an SWRO (seawater reverse osmosis) assembly through a pipeline, a concentrated water outlet of the SWRO assembly is connected and communicated with a DTRO (disk tubular reverse osmosis) assembly through a pipeline, and a concentrated water outlet of the NF assembly is communicated with a wastewater collecting tank through a pipeline. With the adoption of the membrane separation combination zero-emission system for deeply treating desulfurization wastewater with the whole membrane method, the pure water recovery rate is higher, the occupied area is small, the cost is low, resource utilization is realized, membrane assemblies cannot be blocked by dirt, stable operation of the membrane system is guaranteed, the wastewater treatment efficiency is improved, resource waste is avoided, and meanwhile, unnecessary environmental pollution is reduced.

The invention discloses a seawater reverse osmosis desalination apparatus for boats. The apparatus comprises a pretreatment unit and a reverse osmosis membrane treatment unit, and the pretreatment unit comprises a self cleaning filter, a multi-medium filter and a water tank which are sequentially connected through a water pipe; and the reverse osmosis membrane treatment unit comprises a reverse osmosis membrane device, a self cleaning system and a high-pressure water pump, the motor of the high-pressure water pump is provided with a frequency converter, and the pressure and the flow of the pump can be adjusted through the frequency converter. The invention also discloses a seawater reverse osmosis desalination technology for boats. A reverse osmosis membrane is used to desalinate seawater in order to develop the seawater reverse osmosis desalination apparatus for boats, having the advantages of compact structure, high automation degree, high reliability and flexible power matching.

The invention relates to a seawater desalination device which comprises a coagulation and clarification pool, a clean water pool, a clean water pump, a fine sand filter, a seawater safety filter, a high pressure pump, a seawater reverse osmosis device, a fresh-water tank and a deep desalting system, wherein the output end of the coagulation and clarification pool is communicated with the input end of the clean water pool; the output end of the clean water pool is connected with the input end of the clean water pump; the output end of the clean water pump is connected with the input end of the fine sand filter; the output end of the fine sand filter is communicated with the input end of the seawater safety filter; the output end of the seawater safety filter is connected with the input end of the high pressure pump; the output end of the high pressure pump is connected with the input end of the seawater reverse osmosis device; the output end of the seawater reverse osmosis device is connected with the fresh water tank; and the output end of the fresh water tank is connected with the deep desalting system. The seawater desalination device provided by the invention has the characteristics of small size and low cost.

The invention provides a heat film coupled water feeding allocating system for desalting seawater and belongs to the technical field of seawater desalting. The heat film coupled water feeding allocating system comprises a seawater lifting pump, a low-temperature and multi-effect seawater desalting device, a concentrated water lifting pump, a seawater reverse osmosis device, a heat exchanger, a first lifting pump, a seawater mixing and allocating box, a first lifting pump, a second lifting pump, a third lifting pump, a temperature sensor, a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, a sixth control valve, a first shut-off valve and a second shut-off valve. The heat film coupled water feeding allocating system for desalting the seawater has the advantages that residual heat and residual energy of a desalting system are utilized to the greatest extent; the problem that reverse osmosis seawater desalting cannot be normally operated, caused by the fact that the temprature of the seawater in North China is low in winter, is solved; the recovery rate of freshwater is remarkably improved.

A lifting device includes: at least one first magnetic body, which is positioned on a platform and driven by a driving unit so as to move along a predetermined track; at least one second magnetic body, which is positioned above a part of track of the first magnetic body by a supporting device, and the magnetism of which is repulsive to that of the first magnetic body; and a lifting mechanism, which is fixedly connected to the second magnetic body, the second magnetic body is lifted or lowered according to the first magnetic body passing through or leaving from the second magnetic body during its movement course so as to cause the lifting mechanism to be lifted, lowered or swung. The lifting device can lift heavy objects by magnetic energy existing in the nature and has a simple structure, broad applicability, energy saving and high enviromental protectionability. A power generation device and a sea reverse osmosis device that have the lifting device are disclosed.

The invention discloses a seawater desalination device and composite system utilizing temperature difference drive. The device comprises a reverse osmosis membrane system, a first pressure maintainingsystem and a drive system, the drive system comprises a first phase-change cylinder and a first drive cylinder, and the first phase-change cylinder is provided with a phase change working medium anda temperature regulating system; the first drive cylinder is provided with a first seawater inlet and a first seawater outlet, the interior of a cylinder body is provided with a drive piston, and thefirst seawater outlet and the first pressure maintaining system are separately connected with a water inlet of the reverse osmosis membrane system; and temperature of the first phase-change cylinder is adjusted to make a phase change working medium have phase change, and the phase change working medium drives the drive piston to enter seawater raw water, and after pressurizing is performed, seawater desalination is performed. According to the device provided by the invention, the multi-stage drive system and an energy recovery system are added in the composite system, the energy recovery system absorbs and utilizes residual pressure of reverse osmosis concentrated brine and partial heat of the concentrated brine by combining temperature difference drive, supplements seawater to the reverseosmosis membrane system, and better solves the problem of high energy consumption costs in seawater reverse osmosis desalination.

The invention relates to a solar photovoltaic direct-drive seawater reverse osmosis desalting device and belongs to the technical field of seawater desalting. The solar photovoltaic direct-drive seawater reverse osmosis desalting device comprises a solar photovoltaic panel, a power supply control system, a water-taking pump, a reverse osmosis membrane module as well as a DC-DC circuit, a DC motor set and an electric control valve, wherein the solar photovoltaic panel is connected with an electrical input interface of the DC-DC circuit; the electrical output of the DC-DC circuit is connected with the electrical input of the DC motor set; the water output of the water-taking pump is connected with a water inlet of the reverse osmosis membrane module, a concentrated seawater outlet pipeline of the reverse osmosis membrane module is connected with the electric control valve, a control signal output interface of the power supply control system is respectively electrically connected with a control signal output interface of the DC-DC circuit and the electric control valve; and the DC motor set is connected with the water-taking pump and a high-pressure pump by virtue of couplers. According to the device, a storage battery and an inverter are not required, the energy consumption, the size and the cost are decreased, operating parameters can be adjusted in response to changes in solar irradiance so that the efficient and the normal running of the reverse osmosis membrane module is ensured.

The invention discloses a seawater desalination energy recovery device combined with temperature difference driving and a composite system of seawater desalination energy recovery devices combined with the temperature difference driving. The device comprises a phase change cavity and a seawater cavity. A concentrated brine tank is arranged in the phase change cavity. A phase change working mediumis arranged in the portion, positioned at the outer periphery of the concentrated brine cylinder, of the phase change cavity, and a temperature regulation system controlled by a logic program and usedfor enabling the phase change working medium to generate phase change is arranged in the phase change working medium. The concentrated brine with residual pressure and desalinated by a seawater reverse osmosis desalination system enters the concentrated brine tank, the energy of the concentrated brine with residual pressure initially pressurizes seawater raw water before desalination through energy transfer, the capacity of the seawater cavity is adjusted and the pressure of the initial pressurization is maintained, the temperature of the phase change working medium is adjusted to enable thephase change working medium to generate phase change and drive a second piston to move, and the second piston drives seawater entering the seawater cavity to be pressurized and enter the reverse osmosis desalination system. According to the energy recovery device, temperature difference driving and residual pressure driving are combined, and the energy recovery efficiency can theoretically reach more than 100%.

The invention relates to a seawater desalination system, which includes a coagulation clarification pool, a clean water pool, a clean water pump, an ultrafiltration device, an ultrafiltration water pump, a seawater cartridge filter, a high pressure pump, a seawater reverse osmosis device, a fresh water tank and a deep desalting system. The output end of the coagulation clarification pool is communicated with the input end of the clean water pool, the output end of the clean water pool is connected to the input end of the clean water pump, the output end of the clean water pump is connected to the input end of the ultrafiltration device, the output end of the ultrafiltration device is connected to the input end of the ultrafiltration water pump, the output end of the ultrafiltration water pump is communicated with the input end of the seawater cartridge filter, the output end of the seawater cartridge filter is connected to the input end of the high pressure pump, the output end of the high pressure pump is connected to the input end of the seawater reverse osmosis device, the output end of the seawater reverse osmosis device is connected to the fresh water tank, and the output end of the fresh water tank is connected to the deep desalting system. By treating seawater with the seawater desalination system provided by the invention, the obtained fresh water has high quality.

The invention discloses a coal bed gas produced water disposal system, mainly comprising a regulating tank, a novel multimedia filter, a security filter, a reverse osmosis device, a first level concentrated water tank, a concentrated water reverse osmosis device, a second level concentrated water tank and a reuse water tank. The novel multimedia filter adopts porcelain sands and ceramsites as the filtering media, a reverse osmosis membrane assembly of the reverse osmosis device employs reverse osmosis membrane elements special for brackish water (BW type), and a concentrated water reverse osmosis membrane assembly employs specific reverse osmosis membrane elements for brackish water with high salinity or seawater. The coal bed gas produced water disposal system provided in the invention provides a solution to the problems of high salinity content, abundant surfactant of petroleum, selenium or heavy metals in excess of the standards, complex water quality and hard recycling of the coal bed gas produced water. Characterized by simple structure, low operation cost, good disposal effect and the like, the disposal system can recover the coal bed gas produced water of hypersalinity at a rate of 90%, thus being at a leading level in the industry.

The invention relates to an intelligent power network-based northern basin city dry-type haze treatment method. In order to solve haze problems, at night of a clear day, water mist is sprayed to a northern basin city suffering from dry-type haze so that air in the basin has high water content. The sprayed water mist is driven through night off-peak electricity of a city smart power network. A water source of the sprayed water mist comprises fresh water produced from the existing city surface water source or from seawater through reverse osmosis. The reverse osmosis method utilizes night off-peak electricity of a city smart power network as powder. From a seaside water source to a basin city seawater reverse osmosis-based fresh water preparation device, multiple pumping stations for seawater conveying are orderly cascaded. Between the adjacent pumping stations, multiple parallel cascaded seawater-culture ponds allowing seawater self-flowing are connected in series from upstream to downstream. The pumping stations are driven through night off-peak electricity of the city smart power network. The method fully utilizes off-peak electricity of the city smart power network, realizes treatment on haze without increasing of city energy use and water resource burden, produces seawater culture products and sea salt as side products, provides bittern for city pavement ice prevention, substantially improves a city atmosphere environment and has good input-output benefits.

The invention relates to a seawater desalination system for removing boron by using electrodeionization, comprising a water pipe, a seawater pretreatment system, a seawater reverse osmosis desalting and boron-removing desalination system, an electrodeionization boron-removing desalination system and a seawater deep treatment system, wherein the seawater pretreatment system, the seawater reverse osmosis desalting and boron-removing desalination system, the electrodeionization boron-removing desalination system and the seawater deep treatment system are sequentially connected in series to the water pipe. The seawater desalination system is characterized in that a reverse osmosis technology and an electrodeionization technology are jointly used to remove boron in seawater with high efficiency and low consumption; with the adoption of the technologies, more than 99% of salt and more than 92% of boron in the seawater can be removed, so that produced water reaches Sanitary Standard for Drinking Water (GB5749-2006). The seawater desalination system for removing boron by using the electrodeionization has the advantages of small space occupation, low energy and agent consumption, low operation cost, safety and reliability for equipment operation and simplicity in maintenance.

The invention provides a resource recovery system device and method for desulfurization wastewater. The resource recovery system device comprises a wastewater concentration unit, a conditioning precipitation unit, a membrane filtration unit and an evaporative crystallization unit which are connected in sequence in a material flow direction, wherein the conditioning precipitation unit comprises atleast two stages of conditioning modules which are sequentially connected in the material flow direction, and the membrane filtration unit comprises a nanofiltration device and a seawater reverse osmosis device which are sequentially connected along the material flow direction. According to the invention, chemical conditioning treatment and physical membrane filtration treatment are combined, ionsprone to precipitation are removed in advance after chemical conditioning so as to prevent membrane holes from being blocked or prevent scaling from being formed on the surface of a membrane in a membrane filtration process, and concentrated water generated by membrane filtration flows back to a wastewater concentration unit, so that magnesium ions and sulfate ions in the desulfurization wastewater entering the wastewater concentration unit are increased, and the working pressure of the wastewater concentration unit is reduced.

The present invention relates to a method and apparatus for having a integrated fluid media filtration and membrane unit within the hull of a sea-bound vessel. The vessel's propulsion will drive the flow of seawater into the media filtration and membrane unit. Multiple stages of the passing of seawater via the membrane and / or a series of progressive membranes can be implemented to reduce the level of sodium chloride present in seawater to desirable specifications.

The invention belongs to the technical field of reverse osmosis membrane separation performance testing, and discloses a testing method for the de-boron rate of a coiled seawater reverse osmosis membrane element. The seawater reverse osmosis membrane element is swashed with deionized water or distilled water at room temperature, then a boric acid test solution containing sodium chloride is prepared in a water tank of a reverse osmosis membrane element permeability testing device, and the pH value is adjusted; after the reverse osmosis membrane element is loaded into a membrane shell, the inletwater pressure, temperature and recovery rate are adjusted, prepressing is performed for a certain period of time under the conditions, inlet water and produced water of the testing device are respectively collected for multiple times and the concentrations of boron elements are analyzed, then the average value is used as the final boron concentration of the inlet water and the produced water, and the de-boron rate of the coiled seawater reverse osmosis membrane element is calculated. The requirements needing to be met by the reverse osmosis membrane element and the pretreatment method duringde-boron rate testing are definite, the concentration of the testing solution, the pH value, the inlet water temperature, the pressure and the recovery rate are controlled and defined, and the reliability of the testing method and the comparability and repeatability of the test results are improved.

The invention provides a novel efficient seawater desalting device. The novel efficient seawater desalting device comprises a reverse osmosis seawater desalting system, a vacuum distillation system, acondensation and water production system, a heat energy circulating system and a product water tank, wherein the vacuum distillation system is communicated with the condensation and water productionsystem, the reverse osmosis seawater desalting system and the heat energy circulating system respectively; and the product water tank is communicated with the condensation and water production systemand the reverse osmosis seawater desalting system respectively. The novel efficient seawater desalting device provided by the invention has the beneficial effects that 1, power is provided for runningof subsequent equipment through negative-pressure suction energy generated by a spraying effect of seawater reverse osmosis concentrated water through a spraying device; 2, heat exchange is carried out on concentrated water in a membrane distillation box by adopting the sprayed concentrated water, so that the heat energy is recycled to a great extent and power consumption of a heater is reduced;3, a distillation membrane assembly is adopted, is a hydrophobic membrane, has good permeability on water steam and is used for stopping osmosis of the concentrated water; and 4, the heat energy is recycled by adopting a water steam method in a seawater cooling condenser, and temperature raising treatment is carried out on seawater and the water yield of a reverse osmosis membrane is improved.

The invention discloses a reverse osmosis system capable of increasing the seawater desalination recovery rate and a recovery method. The water inflow is often increased to guarantee certain producedwater volume with traditional seawater reverse osmosis methods, which results in large pretreated water volume, high flow of a water inlet high-pressure pump, high system energy consumption and high operation cost. The reverse osmosis system comprises a primary desalination system (11) and a secondary desalinization system (12), wherein the primary desalination system comprises a primary reverse osmosis membrane front end (1) and a primary reverse osmosis membrane back end (2), and a concentrated water outlet of the primary reverse osmosis membrane front end and a seawater inlet of the primaryreverse osmosis membrane back end are connected through a high-pressure pipeline.

The invention relates to a seawater desalting device, a seawater desalting method and a medicinal liquid washing method. A seawater reverse osmosis filtering device comprises a water inlet valve, a high-pressure pump, a reverse osmosis membrane group, a pressure adjusting valve, a water outlet valve, a fresh water outlet valve, a liquid level valve, a washing water tank and a washing valve, wherein the water inlet valve and the washing valve are first duplex integrated control valves; a fluid channel I is formed inside the water inlet valve; a fluid channel II is formed inside the washing valve; the fluid channel I and the fluid channel II are rotated and matched synchronously with valve core rods; touch points are arranged on the valve core rods; the touch points respectively correspond to a first touch point switch and a second touch point switch in different positions; the first touch point switch is electrically connected with a high-pressure pump switch so as to form a first power-on switch circuit; the second touch point switch is electrically connected with a time controller and the high-pressure pump switch so as to form a second power-on switch circuit. By adopting the structure, procedures of stopping and washing machines and washing by using a medicinal liquid in seawater desalting are reduced, the structure is simplified, and the efficiency can be improved.