250 results about "Reverse osmosis desalination" patented technology

An impulse-type "wave motor" employs a seabed-mounted or supported structure mounting a wave energy absorbing panel on a hinged lever arm for reciprocation motion to obtain optimal absorption of wave energy from wave motion in the sea. For deepwater wavelengths of L, the panel is optimally positioned in a region within L/2 depth from the sea surface. The panel motion is coupled by a connecting rod to a fluid pump which generates a high-pressure fluid output that may be used to drive a reverse osmosis desalination unit or to produce other useful work. Seawater or brackish water may be desalinated through reverse osmosis membranes to produce water quality for consumption, agricultural, or other uses. The submerged operating environment of the device in a region of one-half the design wavelength provides the maximum available energy flux and forced oscillations. The pump may be of the positive-displacement piston type, plunger type, or multi-staging driver type, or a variable volume pump.

This invention discloses energy-recovery device for strong brine based on desalination technique by reverse osmosis, which comprises hydraulic cylinder with guide bar connected to piston; water inlet three-way solenoid valve with one end connected to end of guide bar, and other two ends connected separately to water outlets of low and high pressure water-feed pumps; drainage three-way solenoid valve with one end connected to the hydraulic cylinder end far away guide bar, and other two ends connected to strong brine discharge pipes of reverse osmosis membrane; sensor, to obtain the position signal of piston; controller, to control the synchronized open and shut of two aforementioned three-way solenoid valves. It has high efficiency, runs stably, switches quickly and fit to spread in industry.

An apparatus for continuous closed-circuit consecutive sequential desalination of a salt water solution by reverse osmosis that comprises a closed circuit system comprising one or more desalination modules having their respective inlets and outlets connected in parallel by conducing lines, each of desalination modules comprising of one or more membrane elements, a pressurizing device for creating counter pressure to enable reverse osmosis desalination and replacement of released permeate by fresh, a circulation system for recycling the desalinated solution through the desalination modules, a conducting line systems for permeate collection from the desalination modules, a conducting line system for removing brine effluent a valve system to enable periodic discharge of brine from the closed circuit without stopping desalination, and monitoring and control systems to enable continuous closed circuit desalination of desired recovery proceed in consecutive sequential steps under variable or constant pressure conditions.

The invention discloses a reclaimed craft to dispose electroplating waste water, which comprises the following steps: adopting oxidation-reduction and chemical precipitation disposing method and film technology (fold filtration, hyperfiltration, Na filtration and reverse osmosis desalination) deep purifying method; avoiding accumulation of salt effectively; reverse osmosis sloughing monovalent salt at last grade; trapping bivalent salt in innocent treatment system; proceeding depositing treatment continually; removing accumulating BOD and COD in water body through biochemical treatment effectively; realizing zero discharge of waste water.

The invention discloses a coking wastewater deep treatment and reuse process and equipment thereof, belonging to the technical field of environmental protection, and the main steps are as follows: dosing a coagulant in biochemical treatment water, then leading the biochemical treatment water to enter into a sedimentation tank, discharging sludge from a sludge hopper, leading treated water to enter into a three-dimensional electrode reactor, leading the outlet water after electro-oxidation treatment to enter into a biological filter tank, and leading the water after the treatment of the biological filter tank to enter into a follow-up ultrafiltration treatment; the ultrafiltration outlet water has two selections, one is to reuse the outlet water as the process water directly, the other one is to continuously pass through a reverse osmosis membrane system for treatment; and the coagulation and sedimentation tank, the process equipment of the three-dimensional electrode reactor, the biological filter tank, the ultrafiltration system and the reverse osmosis desalination system are adopted during the treatment process, thereby achieving the purposes of removing residual refractory organic matters, suspended impurities and salt in the waste water, reusing the outlet water, simultaneously leading the content of the organic matters in the reverse osmosis concentrated water not to exceed the national environmental protection standard, also reusing the concentrated water in occasions with less stringent requirements on the water quality and achieving the purpose of zero emission of the wastewater.

The invention discloses an energy-saving reverse-osmosis desalination technique for seawater/salt water. Wherein, using lifting water pump to force some seawater/salt water into water cylinder by transfer valve to push piston and extrude strong brine on another side and discharge from another valve, and other seawater/salt water into reverse-osmosis membrane from high-pressure pump to discharge strong brine into another water cylinder and push piton to extrude seawater/salt water on another side into reverse-osmosis membrane from transfer valve and booster pump; adjusting and switching the operation of valves to realize desalination process. The said equipment also comprises energy-recovery device with transfer valves on two ends that composes of valve body, lining and valve core with two flow paths; there are four connection ports distributed evenly on the valve body and core. This method is flexible and reliable.

The invention discloses a process for reusing waste leachate and a device thereof. Which comprises a homogenization process stage, an anaerobic process stage, an aerobic process stage 1, an advance oxidization stage, an aerobic process stage 2 and a reverse osmosis desalination stage.The device comprises the following equipments connected in series by pipes in turn: a water regulating tank, a collecting well, an up-flow anaerobic sludge bed reactor, a reaction tank for continuous and interval aerating, an ozonation system, a membrane biological reactor, a middle tank in which a water pump is arranged, a reverse osmosis system in which a pump, a precise filter and reverse osmosis component are arranged as well as a clean water tank.The beneficial effects of the invention lie in that: a plurality of organic matters which are difficult to degrade can be effectively resolved; a whole set of processes such as the anaerobic process, the aerobic process, the advance oxidization process and the microfiltration are used as pretreatments of the reverse osmosis(RO) system and the water quality index fully meets the water quality requirements of the reverse osmosis system. The last desalination is carried out by using reverse osmosis system to ensure the water quality index reused by the leachate.

A process for desalinating seawater with high recovery rate of fresh water (more than 60%) includes such steps as depositing, disinfecting, filtering, ultrafiltering, pressurizing, taking reverse osmosis of raw water, energy recovering, intersegment pressurizing, taking reverse osmosis of fresh water, discharging concentrated water, disinfecting and discharging fresh water.

The invention relates to a treating method for desalting high-salt-content waste water in an oil and gas field during exploration and transmission of oil and natural gas. The method comprises the following steps of: a, adding a hard water softener and a flocculant to waste water, wherein based on each stere of waste water, the addition amounts of the components are as follows: 0.5-0.9kg of hydroxide, 0.5-0.9kg of carbonate and 1.5-3.0kg of the flocculant; b, filtering the waste water by utilizing an ultra-filtration membrane, and filtering by sequentially utilizing a quartz sand filter and a fine filter; and c, carrying out a reverse osmosis desalination treatment on filtered water. According to the treating method for desalting the high-salt-content waste water in the oil and gas field, disclosed by the invention, through various forms and multi-level treatments, organic matters and soluble salt-type matters in water bodies of the oil and gas filed are effectively removed, and thus the chloride concentration of the high-salt-content waste water of the oil and gas field is less than 250mg/L, and other indexes of the high-salt-content waste water can meet first-level standard requirements of the Sewage Comprehensive Drainage Standard (GB8978-1996).

The invention provides a zero discharge method of stainless steel cold rolling acidic waste water concentrated liquid, which orderly comprises the following steps: (1) softening, and coagulating sedimentation; (2) pH adjustment; (3) filtration; (4) membrane distillation, that is, heating the waste water concentrated liquid treated in step (3) to 55-75 DEG C, allowing the waste water concentrated liquid to enter a membrane distillation assembly, wherein the obtained condensed water can be recycled for production; (5) evaporative crystallization, that is, allowing the concentrated liquid discharged after membrane distillation treatment in step (4) to enter an evaporating crystallizer for evaporative crystallization to obtain crystal slurry, heating the crystal slurry in a heating chamber to 95-100 DEG C, allowing the heated crystal slurry to enter a crystallization chamber, boiling the crystal slurry to allow the solution to reach a saturation state, and discharging the generated crystals. The zero discharge method of the invention carries out membrane distillation and evaporative crystallization treatment of concentrated liquid generated by reverse osmosis desalination treatment of stainless steel cold rolling waste water, recycles obtained pure water for production, converts inorganic salt in the concentrated liquid into solids, realizes zero discharge of waste water, and has good social benefit and environment benefit.

This invention relates to heterogenous pore polymer nanotube membranes useful in filtration, such as reverse osmosis desalination, nanofiltration, ultrafiltration and gas separation.

A valve-controlled residual pressure recovering equipment for impervious seawater desalinating system is composed of hydraulic cylinder, free piston in the cylinder, and high-and low-pressure three-way electromagnetic valves at both ends of the said cylinder. The position and operating time of the cores of the said electromagnetic valves are controlled by computer program. The inlet of high-pressure concentrated saline and the outlet of pressurized seawater are opened or closed simultaneously. The inlet of raw seawater and the outlet of concentrated saline are opened or closed at same time. Its advantages are simple structure, high reliability,and high efficiency of recovering residual pressure (up to 70-90%).

The invention relates to a seawater desalination device and a method, and relates to the seawater device and its method by combining an electrolytic technology, a capacitance adsorption deionization technology and a low pressure reverse osmosis technology. The device comprises an electrolytic purifying system, a capacitance adsorption deionization system and a low pressure reverse osmosis system; the electrolytic purifying system comprises a stop valve, a water supply pump, an electrolytic machine, a deposition pot and a microfiltration apparatus; the capacitance adsorption deionization system comprises the stop valve, an elevator pump, a cartridge filter, the water supply pump, a capacitance adsorption deionization apparatus, a primary fresh water storage tank and a concentrated water booster pump; the low pressure reverse osmosis system comprises the stop valve, the water supply pump, the cartridge filter, a high pressure pump, a low pressure reverse osmosis membrane component and a fresh water storage tank. The method comprises the following steps: electrolyzing, performing capacitance adsorption deionization and primarily desalinating, finally performing low pressure reverse osmosis desalination. The method has the advantages of short process flow, small investment and less environmental pollution, the reverse osmosis system material has the advantages of low requirement and low cost, and solves the problem of nationalization, and the seawater desalination device has the advantages of high efficiency, low energy consumption, low production cost, high integrated level of the device, small volume, easy operation and the like.

The invention discloses a high-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis. The method comprises the following steps: 1, performing chemical precipitation hardness removal and pretreatment on raw water; 2, performing reverse osmosis desalination treatment; and 3, regulating the pH value of reverse osmosis concentrated saltwater with hydrochloric acid or sulfuric acid to be 4-6 so as to serve as raw electrodialysis water, and enabling the water to respectively enter a desalting chamber and a concentration chamber formed by an anode membrane and a cathode membrane at an interval in an electrodialysis membrane stack, thereby obtaining high-salt electrodialysis water and low-salt electrodialysis water. According to the method disclosed by the invention, extra equipment and devices are not needed, and two ions forming a scale forming matter are separated under the condition that the recovery rate is not changed, so that a scaling phenomenon caused by simultaneous interception or simultaneous permeation is avoided.

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 discloses a polymer containing phosphonate group. The polymer is prepared by mixing a monomer containing phosphonate group and a diphenol (dithio) monomer (or to different kinds of diphenol (dithio) monomers with dihalide monomer according to a certain proportion; heating to a certain temperature in high-boiling-point aprotic solvent with existence of medium strong base and methylbenzene, subjecting the mixture to backflowing and water diversion for some time before evaporating the methylbenzene, increasing reaction temperature, reacting for some time continuously, pouring reaction liquid into deionized water after reaction, and obtaining solid; then washing the solid three times by deionized water and obtaining a polymer I or II by drying in vacuum, wherein the monomer containing phophonate group is di (4-fluorine phenyl) (3'-diethyoxyl phosphonic acyl phenyl) phosphonic oxide or di (4-chlorphenyl) (3'-diethyoxyl phosphonic acyl phenyl) phosphonic oxide. The polymer containing phophonate group expresses excellent reverse osmosis desalination and proton conduction performances.

The invention provides a system and a process for desalting recycle-water of iron and steel combined sewage by a bi-membrane method, which belong to the technical field of treatment and recycling of sewage. The system comprises a cooling tower, a raw water tank, a micro-flocculation filter device, a flow by-pass activated carbon filter kettle, a laminated filter, an ultrafiltration system, an ultrafilter, a reverse osmosis system, and a reverse osmosis desalination water tank. The system and the process are used for solving the problem of desalination of the recycle-water of sewage by the bi-membrane method for steel enterprises. In the system and the process, the pretreated water is treated through the ultrafiltration device by bi-membrane desalination to meet the requirement that SDI is less than or equal to 3, and the water is subjected to desalinating treatment through the reverse osmosis device. The system and the process treat the recycle-water of the iron and steel combined sewage by a mode combining preoxidation, micro-flocculation filtration, flow by-pass activated carbon filtration and self-cleaning filtration, thereby greatly improving the operating stability and the service life of the bi-membrane desalination system, effectively realizing sewage reclamation and 'zero drainage' of the sewage, and having important practical value on the desalination of the recycle-water of the iron and steel combined sewage.

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 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 forward osmosis membrane bioreactor/reverse osmosis combined fresh water increasing method, which comprises the following steps: setting the first-stage and second-stage forward osmosis membrane components in the forward osmosis membrane bioreactor, after pretreatment The sewage water flow B is input into the forward osmosis membrane bioreactor, the pretreated seawater flow A is input into the first-stage forward osmosis membrane module, and the output water flow C is boosted by the booster pump and then input into the reverse osmosis membrane module for liquid Membrane separation, the output product water flow D becomes finished fresh water after being sterilized by the sterilizer, and the remaining concentrated brine flow E is input to the second-stage forward osmosis membrane module for infiltration, and the output water flow F is discharged to the sea, and is set in the forward osmosis membrane biological The aerator at the bottom of the reactor is used for aeration. The method of the invention improves the water recovery rate of the reverse osmosis desalination system and reduces system energy consumption; reduces the sea discharge concentration of seawater desalination concentrated brine; improves the flux of the forward osmosis membrane, prolongs the service life of the membrane, and improves the system water recovery rate.

The invention discloses a reverse osmosis container-type sea water desalination plant and a water producing process thereof. The reverse osmosis container-type sea water desalination plant comprises a container, a pre-treatment system, a sea water desalination system, an automatic control system, a reagent feeding system, a sea water inlet and a produced-water outlet, wherein the container is located outside; the pre-treatment system, the sea water desalination system, the automatic control system and the reagent feeding system are arranged in the container in sequence in a matching manner, and the sea water inlet and the produced-water outlet are formed in the same side of the container. The process flow sequences are shown as follows: taking source sea water, initially filtering by a sand filter, precisely filtering by a security filter, performing reverse osmosis desalination, supplying water by a water producing pump and feeding reagents by a supporting reagent feeding system; a reverse osmosis system also comprises an energy recovery plant and a chemical cleaning/fresh water replacement device, wherein the energy recovery plant is used for recovering energy, and the chemical cleaning/fresh water replacement device is used for performing cleaning or replacement. The reverse osmosis container-type sea water desalination plant and the water producing process thereof disclosed by the invention have the advantages that the energy conversion efficiency is high; the structure is compact; the occupied area is small, and while a high-pressure strong brine emission risk is lowered, the system investment and operating cost can be reduced.

The invention discloses a high-salt iron phosphate liquid waste zero-emission treatment device. The device structurally comprises a pre-treatment (PT) system, a reverse osmosis (RO) treatment system and an evaporative crystallization (VC) treatment system. The high-salt iron phosphate liquid waste zero-emission treatment device has the advantages as follows: the device is designed for high salt of the high-salt iron phosphate liquid waste, the high-salt iron phosphate liquid waste is subjected to pre-treatment to remove part of suspended solids and is subjected to reverse osmosis desalination, concentration reduction and reverse osmosis producing water recycling, reverse osmosis concentrated water is subjected to evaporative crystallization treatment finally, condensate water produced through evaporative crystallization is recycled, waste salt is conveyed outwards, and the purpose of zero liquid emission is achieved. The high-salt iron phosphate liquid waste zero-emission treatment device has the specific advantages as follows: pre-treatment, reverse osmosis and evaporative crystallization are organically combined; 2, the reverse osmosis is adopted for concentration reduction, so that the cost of follow-up evaporative crystallization is reduced; 3, an evaporative crystallization technology combining falling film evaporation and MVR (mechanical vapor recompression) is adopted, energy is saved, the efficiency is high, and the operation cost is reduced; 4, the purposes of water recycling and zero liquid emission are achieved.