416results about How to "Increase water production" patented technology

The invention discloses a preparation method of a high-throughput anti-pollution composite nanofiltration membrane. The preparation method comprises the following steps: inorganic nanoparticles are uniformly dispersed in a porous polymer supporting layer, a surface active agent is added in solution A, a polyamide layer is prepared on the porous polymer supporting layer through interfacial polymerization, hot water soaking treatment and glycerol moisturization treatment are adopted, and then drying is performed, and thus, the high-throughput anti-pollution composite nanofiltration membrane is prepared. According to the method, the porous supporting layer microstructure is changed by inorganic nano particles, the surface active agent is added in the solution A, and the flux and the antifouling property of the composite nanofiltration membrane are improved. The preparation method is easy, the raw material is cheap, the preparation process is simple and the method has good industrial applicability.

It is to provide a process for manufacturing potable water from a liquid to be treated, such as seawater by using forward osmosis membrane, wherein the solution after the separation of water from dilute draw solution diluted by the migration of water from the liquid to be treated, is stably regenerated and reutilized and an apparatus therefor, and the process and apparatus are a process for manufacturing potable water which comprises, a forward osmosis step wherein a liquid of which solvent is water is allowed to contact with a draw solution produced by dissolving a prescribed amount of a volatile material in water through a semi-permeable membrane, and water in said liquid is allowed to migrate to said draw solution through said semi-permeable membrane, a distillation step wherein a dilute draw solution having been diluted with water which was produced in said step is adjusted to a prescribed temperature, and then is delivered to a distillation column where gas comprising the volatile material and water vapor is discharged from the top of the column and potable water is discharged from the bottom of the column, and a cooling • regeneration step wherein said draw solution is regenerated by cooling said gas and an apparatus therefor.

This invention relates to coupling apparatus and method for desalting seawater by using nuclear energy. The apparatus comprises: a small-scale nuclear thermal reactor, a reverse osmosis seawater desalting system, a distillation seawater desalting system, and auxiliary apparatus. The method comprises: (1) transferring the heat generated from the small-scale nuclear thermal reactor to the steam generator, and driving the reverse osmosis high-pressure pump with the generated saturated steam in the turbine for seawater desalting; (2) introducing the saturated steam exhausted from the end stage of the turbine to the distillation seawater desalting system for seawater desalting; (3) returning the condensed water to the steam generator; (4) introducing seawater into the distillation seawater desalting system, cooling at the heat discharge section, sending to the reverse osmosis high-pressure pump, pressurizing, sending to the reverse osmosis seawater desalting system, storing the product water in a desalted water tank, and utilizing the condensed seawater or discharging into sea. The method has such advantages as advanced technology, high heat utility, high water productivity and high water quality.

The invention discloses an internal-combustion engine assisted sea water desalinization / poor-quality water purification method and a device thereof. The method comprises the following steps: 1, purifying high-temperature tail gas exhausted from a smoke exhaust pipe of an internal-combustion engine; 2, allowing the purified high-temperature tail gas to enter an evaporation chamber from the bottom of the evaporation chamber, meanwhile, heating raw water to form high-temperature raw water by the high-temperature tail gas, then spraying the high-temperature raw water from a spraying nozzle arranged in the middle of the evaporation chamber to form atomized high-temperature raw water, and carrying out explosive evaporation on the high-temperature tail gas and the atomized high-temperature raw water after meeting in the evaporation chamber to form high-temperature water vapor; 3, allowing the water vapor to pass through a condensate heat exchange chamber arranged on the upper part of the evaporation chamber to form condensate water; and 4, discharging the condensate water from a condensate water discharge pipe, and inputting the condensate water after being purified into a drinking water cabinet. The invention can make full use of the residual heat of cooling water and the tail gas of the internal-combustion engine, has high heat transfer efficiency, large water production rate and good effluent quality, can be used in the places or units which use the internal-combustion engine, and can also be used as pretreatment equipment of various reverse osmosis systems, therefore, the invention can be widely used in small and medium-sized boats such as ocean-going ships or ocean-going fishing-boats and the like which have a long time for sailing at sea.

A unit-type external-pressure hollow fibre membrane module used for biological membrane reactor is composed of frame, tree-type membranes, filtered liquid outlet pipe, and air distributing pipe. A single tree-type membrane consists of top and bottom ends, and external-pressure hollow fibre membrane between both ends. Multiple membrane are parallelly connected via water collecting tube to form a tree-type membrane frame. Multiple air distributing pipes are parallelly connected to form an air distributing pipe frame. Both frames are alternatively arranged. Its advantages are high water output, high strength and high resistance to pollution.

Disclosed is a support for a separation membrane, which exhibits an excellent film-forming property and excellent mechanical strength when used for supporting a separation membrane such as a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane and a reverse osmotic membrane. Also disclosed are a separation membrane and a fluid separation element each utilizing the support. Specifically disclosed is a support for a separation membrane, which comprises a long-fiber nonwoven fabric composed of a thermoplastic continuous filament. The thermoplastic continuous filament is preferably a complex-type filament comprising a high-melting-point polymer and a low-melting-point polymer having a melting point lower by 10 to 140 DEG C than that of the high-melting-point polymer and arranged around the high-melting-point polymer.

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 method for cleaning a reverse osmosis system. The method comprises a step of cleaning a reverse osmosis membrane by using reverse osmosis system cleaning liquid, wherein the cleaning liquid is cleanser-containing aqueous solution; the pH value of the cleaning liquid is controlled to be 11.0+ / -0.5; the cleanser consists of a chelating agent, an anionic surfactant and a polymer dirt dispersion agent; the chelating agent is at least one selected from polyphosphates and ethylenediamine tetraacetic acid; the anionic surfactant is at least one selected from C8-C16 alkylbenzene sulfonate and N-oleoyl-N-methyl taurine; and the polymer dirt dispersion agent is at least one selected from acrylate homopolymer and acrylate copolymer. By cleaning the reverse osmosis membrane with the method provided by the invention, the problems of colloid, organic and microbial pollution and the like which slowly occur on the reverse osmosis membrane can be intensively solved; the salinity of water produced by the reverse osmosis system can be effectively reduced; the water yield of the reverse osmosis system can be increased; and the pressure difference before and after the reverse osmosis membrane can be reduced.

The invention relates to a high-flux polyvinylidene fluoride hollow fiber membrane which is in an asymmetrical structure. From outside membrane fibers to the hollow inside, the high-flux polyvinylidene fluoride hollow fiber sequentially comprises a compact outer skin layer, a first structural layer with finger-like pores, a spongy layer with abundant pores, a second structural layer with finger-like pores and an inner skin layer, wherein the finger-like pores in the first structural layer are larger than those in the second structural layer. The high-flux polyvinylidene fluoride hollow fiber membrane is prepared through a dry-wet spinning process. According to the invention, the polyvinylidene fluoride hollow fiber membrane is in a five-layer structure; above all, the loose spongy layer structure ensures that the polyvinylidene fluoride hollow fiber membrane has high pure water flux and high filtration accuracy; and meanwhile, the polyvinylidene fluoride hollow fiber membrane also has the advantages of satisfactory flexibility and chemical resistance of a polyvinylidene fluoride material. Thus, the water yield in unit membrane area can be effectively increased, and the manufacturing and use cost of a membrane component can be lowered.

The invention relates to a hollow fiber compound nanofiltration membrane. The nanofiltration membrane takes a porous supporting layer as an inner layer and a separating function layer as an outer layer. A casting membrane solution of the porous supporting layer contains an inner layer macromolecular polymer which is selected from one or more of polysulfone, polyether sulfone, polyvinylidene fluoride, polyvinyl chloride and polyacrylonitrile; a casting membrane solution of the separating function layer contains an outer layer macromolecular polymer which is selected from one or more of polyetherimide, polyether-ether-ketone, sulfonated polyether-ether-ketone, polymethyl methacrylate and polyvinyl alcohol; a preparation method comprises the following steps: synchronously extruding and molding the inner layer casting membrane solution and the outer layer casting membrane solution; solidifying to obtain a membrane filament in a nascent state; and carrying out an oxidizing agent aqueous solution to obtain the hollow fiber compound nanofiltration membrane. The invention further provides the preparation method of the nanofiltration membrane correspondingly. According to the hollow fiber compound nanofiltration membrane provided by the invention, the flux of the nanofiltration membrane is remarkably improved, and moreover, the nanofiltration membrane further has the certain desalinization rate.

The invention discloses a water generating method by utilizing separating membrane to enrich air water vapor and device thereof. The water generating method includes that membrane dehumidification assembly and compression method are adopted to carry out air dehumidification treatment, then sweep gas is input into the water vapor side of the membrane dehumidification assembly by virtue of pipeline to realize enrichment of water vapor, and finally condensing is carried out on the high humidity sweep gas for enriching water vapor, thus obtaining water in liquid state or solid state. Compared with absorption method, the invention has the advantages of continuous operation process, no corrosion problem, easy maintenance and low energy consumption; the adopted refrigeration working medium is air, no pollution problem is produced, and compressor and expansion machine are all centrifugal machineries, rotating speed is high, thus equipment volume is small and weight is light under unit water production rate; and meanwhile the low temperature water vapor cooling medium at the outlet of the cold side passage of the main water generating device is led into the cold side passage of the secondary water generating device, so as to cool the air from atmosphere environment and obtain extra water yield.

The invention relates to a chemical cleaning method for a reverse osmosis membrane element, and belongs to the technical field of water treatment. The method comprises the following steps: (1) soaking a first section and a second section of the reverse osmosis membrane element by using an isothiazolinone solution with the content of active matters of 5 to 7 percent, wherein the soaking time is not less than 6 hours; (2) judging a pollutant polluting the reverse osmosis membrane element, and then selecting corresponding chemical cleaning agents; (3) according to chemical cleaning agents selected in the step (2), cleaning the reverse osmosis membrane element in the following three situations, namely cleaning the reverse osmosis membrane element by only using an acid cleaning agent, cleaning the reverse osmosis membrane element by only using an alkaline cleaning agent, and cleaning the reverse osmosis membrane element by using the acid cleaning agent and the alkaline cleaning agent simultaneously. The cleaning effect of the chemical cleaning method is obviously better than that of a conventional cleaning formula; the water yield and the recovery rate can be increased obviously; the operating pressure difference and the conductivity of produced water of reverse osmosis equipment can be reduced; meanwhile, the damage to the membrane element caused by the chemical cleaning times and the chemical agents when the membrane element is cleaned is reduced.

The invention relates to a multistage double effect distillation seawater desalination technology with heating seawater by solar energy. The technology comprises the following steps: seawater is delivered to a high cistern by a seawater pump; the seawater in the high cistern is delivered to a system for water supply through a water supply tube and a condenser inlet tube; the seawater is heated to a certain temperature by adsorbing latent heat of steam in an evaporator through all condensers of the system, and enters the evaporator after being heated to a designed temperature by a rapid heater with solar energy; the seawater enters the evaporator, becomes superheated water and is gasified rapidly and partially because a pressure in the evaporator is controlled to be lower than a saturation vapor pressure corresponding to a temperature of hot seawater; and a part of ungasified hot seawater enters a next stage evaporator and a part enters heat-collecting tubes at two sides of the evaporator. The heat-collecting tubes are provided with annular imbibition films, and the hot seawater flows from top to bottom after entering the heat-collecting tubes. In a flow process, the hot seawater is delivered to upper half parts of inner cavities of the heat-collecting tubes because of capillary imbibition actions of the imbibition films. The hot seawater is evaporated to steam because the heat-collecting tubes have a high temperature under the sunlight, the steam rises along the inner cavities of the heat-collecting tubes and enters the condenser to obtain fresh water which flows into a fresh water tank and then is output by a fresh water tube. Unevaporated concentrated seawater enters a concentrated water tank and is ouput by an inlet / outlet tube.

The invention relates to a wetting-resisting super-hydrophobic membrane and a preparation method thereof. Combined nanoparticles are coated with a low surface energy solution to form a rough structure, and a PDMS-SiO2-PDMS sandwich compound layer is formed on the surface of the membrane. The compound layer has the advantages of rough structure and low surface energy, the membrane has super hydrophobicity, and the membrane further has high wetting resistance in a membrane distilling process. The membrane can be utilized to perform direct contact type membrane distillation to treat a water bodycontaining a surface active agent, so that membrane distillation operation time is obviously prolonged, stable operation time is 20 times or more of that of a PVDF original membrane, and water production capacity can be improved by 15 times or more.

The invention relates to a spiral wound film element, which comprises a central water collecting pipe, sealant, a separation diaphragm, water producing guide cloth and water inlet guide cloth. The spiral wound film element uses multi-folding of the integral separation diaphragm to form a plurality of film blades so as to enlarge the effective film area of the film element, reduce the use of the sealant and achieve the aims of increasing the water yield and reducing the cost.

A Sabatier process involving contacting carbon dioxide and hydrogen in a first reaction zone with a first catalyst bed at a temperature greater than a first designated temperature; feeding the effluent from the first reaction zone into a second reaction zone, and contacting the effluent with a second catalyst bed at a temperature equal to or less than a second designated temperature, so as to produce a product stream comprising water and methane. The first and second catalyst beds each individually comprise an ultra-short-channel-length metal substrate. An apparatus for controlling temperature in an exothermic reaction, such as the Sabatier reaction, is disclosed.

The invention relates to an advanced treatment system for municipal domestic wastewater, and in particular relates to an advanced treatment system and method for municipal domestic wastewater. The advanced treatment system for the municipal domestic wastewater comprises a water inlet pipe and a water outlet pipe, as well as a composite lift bed bio-membrane reactor, a flocculation reactor, a compression type filtering material filter, a chemical dosing device and an aerating apparatus, wherein the aerating apparatus is used for ventilating the composite lift bed bio-membrane reactor, the flocculation reactor and the compression type filtering material filter. According to the advanced treatment system for the municipal domestic wastewater, the treatment effect can be improved; the technological process and the structure arrangement are simplified; the management and operation strength is reduced; and the floor area and the operation cost are reduced.

The invention discloses a method for treating waste water containing ammonia and nitrogen, comprising the steps of: firstly, separating and recycling high content substances in ammonium nitrate waste water and enabling the discharged water to reach the national discharge standard through employing that electrodialysis has operation capacity under the working conditions of sparingly soluble salt and over-saturation; and secondly, deeply treating the discharged water meeting the standard by utilizing reverse osmosis to enable the discharged water to totally meet the indexes of desalted soft water used in ammonium nitrate industry, and simultaneously carrying out electrodialysis separation circulating treatment and recycling to achieve the effect of zero discharge of waste water in an entire system.

The invention discloses an atmospheric purification water generator. The water generator comprises a shell, a control panel arranged on the shell and a refrigeration system consisting of an evaporator, a condenser, a compressor and a fan; an air filter screen is arranged between the evaporator and the fan, a water collection tray is arranged below the evaporator and is connected with an original water tank, the original water tank is internally provided with a water level detection device, a booster pump is connected with the lower part of the original water tank, an outlet of the booster pump is connected with a water filtering system, an outlet of the water filtering system is connected with a water purification tank, the water purification tank is internally provided with an ultraviolet sterilization device, the bottom of the water purification tank is respectively connected with a heating tank and a refrigerating tank, the heating tank is connected with a heat water drain valve, and the refrigerating tank is connected with a cold water drain valve. The water generator has a large water generation amount, and can be connect with an external water source to be used for drinking fountains.

Photovoltaic-powered reverse osmosis system. The system includes a photovoltaic panel for generating electricity and includes a heat exchanger in thermal contact with the photovoltaic panel. The salt-containing feed water is fed to a reverse osmosis unit to produce clean water therefrom. Fluid circuitry, including a pump, circulates the feed water through the heat exchanger to cool the photovoltaic panel and to heat the feed water. It also delivers the heated feed water to the reverse osmosis unit for desalination. Cooling the solar panel and heating the RO feed water increases the total amount of clean water produced. In a preferred embodiment, a thermal controller manages the temperatures of the photovoltaic panel and the feed water by controlling the flow of feed water through the fluid circuitry. The photovoltaic panel temperature is minimized and the temperature of the feed water is maximized subject to a constraint on maximum feed water temperature.

The invention discloses an integrated pressure-bearing heat pipe flat-plate solar water heater and belongs to the field of flat-plate solar water heaters. The solar water heater comprises main components, such as a water tank, a flat-plate heat collector, a bracket and the like, wherein a heat absorption plate core of the flat-plate heat collector is formed by welding a heat pipe and an aluminum plate or a copper plate on which a heat absorption coating is plated; and a condensation section of the heat pipe is positioned outside the heat collector and inserted into the water tank and directly exchanges heat with water in the water tank. Due to an integrated design, the flat-plate solar water heater has the characteristics of high heat collection efficiency and heat absorption speed, compression resistance, frost resistance, high impact resistance, long service life and the like.

The invention relates to a full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and a full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis, wherein the nanofiltration seawater softening recovery rate can be increased, and the membrane surface scaling tendency can be reduced. According to the present invention, the nanofiltration system is a three-stage nanofiltration system, wherein the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly are adopted as the pretreatment of the reverse osmosis, and the third-stage nanofiltration membrane assembly further treats the concentrated water obtained through the first-stage nanofiltration and the second-stage nanofiltration, such that the seawater recovery rate is increased, and the scaling tendency on the nanofiltration membrane surface of the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly is reduced so as to reduce the seawater desalting cost and reduce the scaling tendency of the third-stage nanofiltration membrane assembly during the high salinity concentrated water treatment.

The invention discloses a hollow fibrous membrane module, the two ends of which can have water flowing out for immersing, and aims to provide a membrane module, of which the support tube not only has support function, but also serves as a water channel with the two ends having water flowing out, the structure is simple and the aeration is even. An aeration inlet column is arranged at an air inlet, one end of the aeration inlet column communicates with an aeration device, and the other end is spliced with an inlet pipe. The aeration device comprises an aeration body, in which an air collecting chamber and a water collecting chamber are arranged, the outer side of the aeration body is connected with a plurality of sealed air chambers, and a plurality of aeration holes are arranged on each sealed air chamber. The water collecting chamber is internally provided with a plurality of water outlets, the lower end of the aeration body is provided with a plurality of water inlets, and water passages communicating the water inlets with the water outlets are arranged on the aeration body. One end of the support tube is opened on the end surface of the sealing layer of the water outlet end, and the other end communicates with the water collecting chamber of the aeration device. The support tube has the support function and serves as the water channel with the two ends having water flowing out, thereby simplifying the structure of the membrane module, reducing the volume of the membrane core, reducing the construction cost, and improving the utilization ratio and the water yield of membrane threads.

The invention discloses a pumping injection technology system with a single tube and the same well, which comprises a packer and an inserting and sealing, moveable connectors for connecting an oil tube and an electric pump assembly, a steel pipe with big path for an electric pump with high flow rate to establish a water sampling channel, and the electric pump with high flow rate is coated in the steel pipe with big path, and the water sampling channel passes through from the steel pipe with big path, injected water passes from the outer side of the steel pipe with big path, the lower entering of the electric pump with high flow rate is achieved, the injected water passes through from the center of the lower end of the steel pipe with big path, water which is sampled passes through from the outer to achieve a purpose of sampling the upper layer to inject the lower layer, the channel for sampling water is opposite to a water injecting and sampling channel of the steel pipe with big path. A change-over and shunt device is arranged on the positioning packer to achieve the purpose of overlap changeover of the water injecting and sampling channel, the lower end of a bridge type channel of the change-over and shunt device is communicated with a water sampling layer, and the lower end of a core tube is connected with an oil tube which leads to an water injection layer, boundary surfaces of the water injection layer system and the water sampling layer system are provided with the layer separating packer and the inserting and sealing, thereby the channel is divided.

The invention provides a control method and control device for initial frequency of a frequency conversion compressor of a heat pump heater. The control method for the initial frequency of the frequency conversion compressor of the heat pump heater, disclosed by the invention, comprises the following steps: step S1: obtaining the water temperature Tw of a water tank, the set temperature Ts of the water tank and the outdoor environment temperature Te; step S2: determining the upper limiting frequency Fu for the operation of the frequency conversion compressor according to the outdoor environment temperature Te; step S3: determining the proportion coefficient K of the initial frequency F0 to the upper limiting frequency Fu of the frequency conversion compressor according to the difference value Ts-Tw between the set temperature Ts of the water tank and the water temperature Tw of the water tank and the outdoor environment temperature Te, and determining the initial frequency F0 according to F0=K Fu. According to the control method and control device, disclosed by the invention, the initial frequency is close to the stable operation frequency, so that the frequency conversion compressor of the heat pump heater rapidly achieves a stable state, hot water is complemented timely and stably, and the water yield of a machine set is increased.

A composite nano-filter membrane especially used in an integrated intelligent water purifying tap and a preparation method thereof. The invention belongs to the technical field of sewage treatment. The nano-filter membrane is a composite membrane which includes a non-woven cloth support layer, an ultrathin middle support layer, and an ultrathin compact separation layer. The non-woven cloth support layer is connected to one side of the ultrathin middle support layer. The ultrathin compact separation layer is connected to the other side of the ultrathin middle support layer. A filter core has smaller size, more functions and larger throughput, and is better in purifying effect. The filter membrane is high in throughput even under low pressure, and can selectively remove harmful substances in tap water and maintain the small-molecular organic substances and low-valent inorganic salts that are beneficial to body. The filtered water has good taste, and no water scale is generated in a container after boiling water, thereby satisfying the demands on yield and quality of produced water. At present, the main researching direction of high-throughput nano-filter membranes is modified separation layers, and there is little researching work of improving the throughput and separation performance of the nano-filter membranes from the angle of the support layer and middle layer.

There is disclosed a device for purifying oily wastewater, including a vertical tank of an atmospheric pressure, inside which a central coagulation reaction tube, a reverse cone-shaped cyclone flocculation stage, a suspended sludge filtering zone and a purified water commutation stage of inclined plates are included from bottom to top sequentially, oily wastewater is sequentially subjected to a coagulation reaction, suspended sludge filtering and a purified water commutation process and then discharged, a sludge collecting groove collects and guides the suspended sludge to a sludge concentrating zone for further sedimentation and concentration processes and then discharges it to external to the tank, in this way, the purification reaction, flocculation and fine filtration of wastewater and the sludge concentration process are integrated within the same wastewater purifying device. Thus, the device is equivalent to the existing wastewater pretreatment system plus a fine filtration system.

The invention discloses an inner-loop three-phase biological fluidized bed type membrane bioreactor (MBR). The reactor comprises an inner-loop fluidization region and an MBR membrane bioreaction region, wherein the bottom of the inner-loop fluidization region is communicated with a water inlet pipe; the inner-loop fluidization region comprises an internal cylinder and an external cylinder sleeving the internal cylinder; a gap serving as a downstream area is formed between the internal cylinder and the external cylinder; the internal cylinder is provided with a channel serving as an upstream area; an air-blast system for driving water to rise along the upstream area is arranged inside or at the bottom of the internal cylinder; a packing is arranged in or at the bottom of the internal cylinder; an MBR membrane component is mounted in the MBR membrane bioreaction region; an aerator pipe is arranged at the bottom of the MBR membrane component; the water outlet of the MBR membrane component is communicated with a water producing pipe. The inner-loop three-phase biological fluidized bed is combined with the MBR to form the inner-loop three-phase biological fluidized bed type MBR which is reasonable in spatial arrangement, and therefore, the energy consumption can be further reduced; in addition to treating domestic sewage, the inner-loop three-phase biological fluidized bed type MBR is further capable of treating industrial wastewater in the fields of printing and dyeing process, oils and fats, food, leather and the like.

Provided is an apparatus for producing reclaimed water based on electrolysis and double membrane technologies. The apparatus is disposed with an electrolysis system, an MBR system and a reverse osmosis system. Further provided is a method for producing reclaimed water using the apparatus, comprising the following steps: retrieving biochemical sewage through a water pump (12) and inputting the biochemical sewage into an electrolysis apparatus (13) of the electrolysis system to be electrolyzed, then enabling the sewage to enter an MBR reaction tank (26) through a grid (22) to obtain primary reclaimed water, pumping the primary reclaimed water into the reverse osmosis system with a high pressure pump (45) to separate dialysis water and concentrated water, enabling the dialysis water to enter a reclaimed water storage tank (48) to obtain ultrapure reclaimed water, enabling a part of the concentrated water to flow back for cyclic membrane filtering and separation, enabling a part of the concentrated water to flow back to enter an electrolysis procedure for cyclic use, and discharging the rest part of the concentrated water.

The invention relates to a powdered activated carbon reflux / ultrafiltration combined technology for a water treatment plant. The technology is characterized in that powdered activated carbon are fed into an ultrafiltration membrane tank, and the powdered activated carbon which are kept in the ultrafiltration membrane tank for a proper time are refluxed to a pre-treatment coagulation period at a proper reflux ratio through utilizing a reflux pump, wherein the addition amount of the powdered activated carbon is 5-20mg / L, the reflux ratio is 1%-5% of a system flow, and the retention time of the powdered activated carbon is 2-24 hours. The organic pollutant content of raw water is reduced through fully utilizing the adsorptive capability of the powdered activated carbon in a mixed liquid of the technology, powdered activated carbon particles serve as flocculation cores so as to enhance coagulation, and a treatment effect of a coagulation period is improved; and moreover, the operation stability of a system is improved, and the water production rate is increased. The technology can be widely applied to an ultrafiltration combined technology for the water treatment plant.