230 results about "Produced water" patented technology

The technology relates to the use of a high salinity produced water stream from a gas oil separation plant (GOSP), as a wash water stream for the desalter unit in a GOSP. The produced water stream is pretreated by a sequence of steps and subsequently desalinated by a ultra-high pressure reverse osmosis (UHP-RO) membrane. The UHP-RO produces a permeate stream and a reject stream. A portion of the permeate stream is reused as a wash water stream in the desalter unit of the GOSP.

The utility model relates to the technical field of water collection and distribution device machining, and discloses a machining device for water collection and distribution device production, which comprises a bottom plate, two fixing plates are fixedly connected to the top side of the bottom plate, two clamping blocks are connected to the bottom side of the bottom plate through sliding assemblies, and a plurality of telescopic rods are arranged on the sides, away from each other, of the two clamping blocks. A plurality of springs are arranged on the sides, close to each other, of the two fixing plates, one ends of the springs are connected with the interiors of the telescopic rods, the other ends of the springs are connected with the sides, close to each other, of the two fixing plates, a water collecting and distributing device body is arranged on the sides, close to each other, of the two clamping blocks, and the water collecting and distributing device body is connected with the two fixing plates through a cleaning assembly. According to the utility model, the rejection rate is reduced, the production efficiency and the product quality are improved, the influence of sweeps on subsequent processing or use is avoided, the processing environment is cleaner, the interference of the sweeps on equipment and operators is reduced, and a guarantee is provided for safe production.

A process is described for synthesising hydrocarbons comprising the steps of: (a) feeding a gas mixture comprising hydrogen and carbon dioxide to a reverse water-gas shift unit to form a crude synthesis gas comprising hydrogen, carbon monoxide carbon dioxide and steam, (b) cooling the crude synthesis gas to condense water and removing water, and optionally carbon dioxide, from the crude synthesis gas to produce a feed stream comprising hydrogen and carbon monoxide, (c) passing the feed stream though a hydrocarbon synthesis unit comprising a reactor containing a Fischer-Tropsch catalyst to form a product stream comprising a mixture of liquid hydrocarbons, a co-produced water stream, and a tail gas stream containing hydrogen, carbon monoxide and gaseous hydrocarbons, and (d) upgrading the product stream in an upgrading unit to produce an upgraded product stream, wherein a naphtha stream is separated from the product stream or the upgraded product stream, at least a portion of the tail gas stream is fed with steam to a first derichment vessel containing a derichment catalyst to form a first gas mixture containing methane, at least a portion of the naphtha stream is fed with hydrogen and steam to a second derichment vessel containing a derichment catalyst to form a second gas mixture containing methane, and the first and second gas mixtures containing methane are fed to the reverse water gas shift unit. A system for performing the process is also provided.

This invention relates to the field of industrial wastewater technology, and discloses a resource recovery and zero-discharge treatment process and system for coal gasification wastewater. The resource recovery and zero-discharge treatment process for coal gasification wastewater provided by this invention achieves zero discharge and resource recovery after treatment, with the produced water fully meeting reuse requirements. No wastewater enters conventional downstream advanced treatment and zero-discharge systems. Simultaneously, the salt content in the wastewater is utilized to produce high-value products for sale. The system is not affected by the temperature and quality of the coal gasification wastewater, thus completely solving the shortcomings of conventional biological methods for treating coal gasification wastewater.

This utility model discloses a hot and cold circulating water supply mechanism and device, relating to the field of hot and cold circulating water supply mechanisms and devices. It includes a mounting frame, with a hot water storage tank fixedly connected to the front of the mounting frame, and a cold water storage tank fixedly connected to the front of the mounting frame. A refrigeration unit is fixedly connected to the bottom of the cold water storage tank. Both the hot water storage tank and the refrigeration unit are equipped with a mixing temperature control mechanism at their bottoms. Through this mixing temperature control mechanism, a linear regulating valve precisely controls the mixing ratio of hot and cold water, causing the mixed water to impact the turbine blades under gravity, generating vortices and ensuring thorough mixing within the mixing tank. Temperature sensors feed back data to the control panel for closed-loop control, directly producing water at an intermediate temperature. This avoids the energy waste of secondary heating of cold water or secondary cooling of hot water, reducing energy consumption and further avoiding frequent start-ups and shutdowns of the refrigeration unit and heating elements, thus extending equipment lifespan.

The invention particularly relates to a novel self-power-generation system and method for an offshore unmanned platform. According to the system, ORC power generation is conducted through waste heat resources generated when the offshore unmanned platform produces water and crude oil, electric power generated by the ORC power generation system is adjusted and used through the load adjusting control system, the electric power is supplied to the offshore unmanned platform, and fluctuation of a power grid is prevented. Self power generation of the offshore unmanned platform can be achieved, the isolated network problem is solved, meanwhile, ORC power generation is used for replacing a turbine generator set, fossil fuel and operation and maintenance cost are saved, the economical efficiency of the offshore unmanned platform is improved, and the method can be widely applied to the field of industrial waste heat utilization.

The present application belongs to the technical field of oil and gas field produced water treatment, and particularly relates to an ammonia nitrogen treatment system and method for oil field sulfur-containing produced water. The method comprises the following steps: sending the oil field sulfur-containing produced water into a first buffer pool, reducing sulfides through two-stage aeration of a cyclone aerator and an aeration nozzle device, overflowing from the first buffer pool to a second buffer pool when the first buffer pool reaches a water outlet height, and removing ammonia nitrogen by adding an ammonia nitrogen remover through a conventional dosing port of a dosing device. The present application fully utilizes the characteristics of aeration sulfur removal, and through the addition of a targeted chemical agent and the control of key parameters, purifies and softens the oil field sulfur-containing produced water in one step. After treatment, the water quality only needs to be further filtered by two stages of fine filtration, and the outlet water quality directly meets the steam boiler feed water requirements.

The application discloses a filtering method based on a circulating water path, which is applied to a filtering system, and the filtering system comprises a raw water branch, a booster device, a water production branch, a waste water discharge branch, a pure water discharge branch, a pure water return branch and a preposition device. When it is judged that the water production branch meets a flushing condition, the filtering system is controlled to perform a flushing operation, and the flushing operation comprises first stage flushing and / or second stage flushing. When it is judged that the water production branch meets a water production condition, the filtering system is controlled to perform first stage water production and second stage water production. It can be seen that the application can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water for the filtering system, significantly improve the intelligent control level of the filtering system, improve the flushing efficiency of the filter core, improve the water production rate of the filtering system, improve the quality of the first cup of water, and avoid waste of water resources.

The utility model discloses a biochemical treatment device for MVR (mechanical vapor recompression) distilled water in high-salt gas field produced water, which comprises a treatment shell, an aeration pipe used for aeration in the treatment shell is mounted in the treatment shell, a rotatable dispersing disc is further arranged in the treatment shell, and the dispersing disc is provided with a water inlet and a water outlet. A plurality of dispersing inclined blocks arranged at equal intervals are arranged at the top of the dispersing disc, a mounting seat is fixedly connected to the side face of the treatment shell, a servo motor is fixedly connected to the mounting seat, a driving wheel is fixedly connected to an output shaft of the servo motor, a driving rod is fixedly connected to the center of the bottom of the dispersing disc, and a driving wheel is fixedly connected to the driving wheel. The bottom of the driving rod is fixedly connected with a driven wheel used in cooperation with the driving wheel. According to the utility model, in the biochemical agent feeding process, the biochemical agent can be dispersed and fed through the dispersing disc, so that the mixing efficiency of the biochemical agent and sewage is improved, and the sewage treatment efficiency is improved.

The application provides an oil and gas field waste liquid classification gradient treatment method. The method comprises the following steps: performing electro-oxidation treatment on produced water to obtain electro-oxidation treated produced water; performing adsorption treatment on part of the electro-oxidation treated produced water by using an adsorption material to capture active chlorine, so as to obtain the adsorption material for capturing active chlorine and the adsorption treated produced water; performing biological treatment on the adsorption treated produced water to obtain treated produced water; mixing the other part of the electro-oxidation treated produced water with operation waste liquid, adding the adsorption material for capturing active chlorine, and obtaining gel breaking and de-stabilizing treated operation waste liquid; and performing coagulation and flocculation separation and ion control on the gel breaking and de-stabilizing treated operation waste liquid to obtain treated operation waste liquid. The method is suitable for large platform production mode of oil and gas field development, and can perform classification gradient treatment on produced water and operation waste liquid produced and discharged from platforms in the same region or adjacent regions, so that the treatment cost is reduced.

The application discloses a single-stage multi-section treatment system and method for seawater desalination and boron removal, relates to the technical field of seawater desalination and boron removal, and realizes the pretreatment and first desalination and boron removal of seawater raw water through a single-stage process, cooperates with a pressure exchanger to realize the efficient recovery of the energy of high-pressure concentrated water and the pressurization of low-pressure inlet water, reduces the operation load of a high-pressure pump of a first stage, and realizes the effective reduction of energy consumption; gradient reverse osmosis treatment is performed on single-stage produced water through a multi-section process, the step-by-step pressurization and pressure compensation of high-pressure pumps of all stages on concentrated water of previous sections are utilized, the residual pressure of concentrated water is fully utilized, the gradient reprocessing and deep boron removal of concentrated water are realized, and the overall recovery rate of seawater desalination is improved. In addition, a control unit dynamically determines the optimal operation section number of the multi-section process according to actual inlet water quality and produced water targets, accurately adjusts the pressure of high-pressure pumps of all stages and the start-stop state of membrane assemblies, makes system operation parameters highly adapt to actual working conditions, and avoids the problems of excessive treatment or insufficient treatment caused by fixed section number operation.

The utility model discloses an automatic scraping and washing device for an optical oil-in-water sensor in an automatic water cutting device, which comprises a pipeline, a first window body and a second window body, the end face of the first window body and the end face of the second window body are arranged at an interval and are both arranged in the pipeline, and a power machine is arranged on the side wall of the pipeline. The output end of the power machine is sequentially connected with a scraper base and a cleaning part used for conducting scraping treatment on the end face of the first window body and / or the end face of the second window body, and the scraper base and the cleaning part are both located between the end face of the first window body and the end face of the second window body. According to the invention, oil stains (impurities) on the end face of the first window body and / or the end face of the second window body in a water cutting site can be removed, so that the water quality detection result of the produced water by the optical oil-in-water sensor is more accurate.

The utility model relates to the technical field of water purification, and discloses a production water purification device which comprises a filter cartridge, the top of the filter cartridge is connected with a sewage pipe, a filter element is arranged in the filter cartridge, the top of the filter element is communicated with the sewage pipe, one end of the filter element extends to the outside of the filter cartridge, and the other end of the filter element is communicated with the sewage pipe. The other end of the filter element is connected with an adjusting assembly; the filter element comprises a filter frame which is movably arranged in the filter cartridge in a penetrating manner and is coaxial with the filter cartridge, a plurality of filter grooves which are uniformly distributed are formed in the outer surface of the filter frame, and a filter plate is fixedly mounted on the side, close to the axis of the filter frame, of an inner cavity of each filter groove. According to the utility model, due to the arrangement of the plurality of filter plates, different filter plates are rotated between the sewage pipe and the water baffle through the adjusting assembly, so that the filtration between the sewage pipe and the flow guide pipe can be realized through the corresponding different filter plates, and a good filtration effect aiming at sewage with different components is realized.

This invention discloses a method for producing alcohol-based suspensions for produced water, comprising multiple steps including selecting alcohol-based solvents, adding dispersing agents, adding functional solid particles, precisely adjusting the pH value of the system, thorough mixing and homogenization, and filtration and purification. The alcohol-based suspension produced by this invention has uniformly dispersed internal solid particles and a large specific surface area, exhibiting extremely strong adsorption and capture capabilities. It can rapidly adsorb fine suspended particles, emulsified oils, organic impurities, and other pollutants in produced water, showing significant treatment effects on produced water with high solids content and high oil content. The removal rate of suspended solids can reach over 90%, and the removal rate of oil pollutants can reach over 85%, far superior to traditional flocculation and sedimentation processes. The treated water quality can meet discharge standards or be reused.

This utility model relates to the field of water-based varnish technology and discloses a stirring device for the production of water-based varnish, including a stirring drum. A liquid material feeding pipe is fixedly connected to the upper surface of the stirring drum. This utility model achieves separate feeding of liquid and solid materials by setting up a liquid material feeding pipe and a solid material feeding frame, avoiding problems such as clogging that may be caused by mixing the two. The filter screen can filter impurities in the liquid material, and by pressing the reset buckle, the reset buckle compresses the telescopic spring and retracts into the groove, which can detach the mounting bracket from the positioning seat, thereby removing the filter screen for cleaning and replacement. The motor in the abrasive mechanism drives the drive gear to rotate, which in turn drives the abrasive roller to rotate, thereby breaking up the solid material, reducing the volume of the solid material, facilitating subsequent mixing and stirring, and preventing the solid material from clumping together. This ensures that the solid material can be fully stirred in the stirring drum, thereby improving the quality stability of the varnish product.

A method involving collecting a first geochemical data set for a first plurality of produced water samples; collecting a second plurality of produced water samples; performing geochemical analyses on the second plurality of produced water samples to form a second geochemical data set; and combining the first and second geochemical data sets into a database. The method further includes determining, by a subject matter expert, a water type for each produced water sample in the database and training a machine-learned model with the database to predict the water type of a produced water sample given its geochemical data. The method further includes collecting a third plurality of produced water samples, performing geochemical analysis on the third plurality of produced water samples, and determining, with the trained machine-learned model, the water type for each produced water sample in the third plurality of produced water samples using the third geochemical data set.

The invention discloses a method for preparing a polymer drilling fluid from gas field produced water, which specifically comprises the following steps: step 1, taking the gas field produced water, and carrying out oxidation, alkali addition and membrane filtration treatment to obtain the treated gas field produced water; and 2, preparing the polymer drilling fluid from 5% of bentonite, 50% of clear water, 0.25% of sodium carbonate, 0.25% of PAC-HV, 2.5%-5% of FT-401, 3.33%-8% of SMP-II and the balance of the treated gas field produced water. The invention also discloses a polymer drilling fluid which comprises the following components in percentage by mass: 5% of bentonite, 50% of clear water, 0.25% of sodium carbonate, 0.25% of PAC-HV, 2.5%-5% of FT-401, 3.33%-8% of SMP-II and the balance of treated gas field produced water, and the sum of the raw materials is 100%. The method provided by the invention solves the problem of demand on water resources in the drilling fluid preparation process in dry and less-rainfall areas where gas field produced water is difficult to dispose.

The invention discloses a system for auxiliary filtration of nano particles in ultrapure water based on micron particles, the system comprises a feeding mechanism, a static mixer, an electric field condensation unit and a membrane filtration assembly, the feeding mechanism is used for feeding inert composite micron particles insoluble in water into ultrapure water to be treated; a water inlet and a material inlet are formed in the top of the static mixer, the static mixer is used for uniformly dispersing micron particles and nano pollutants in water to be treated under the condition of no mechanical stirring, and the electric field coagulation unit comprises an outer cylinder, an electrode array and a power supply; and a produced water storage tank and a concentrated solution tank are arranged on one side of the membrane filtration assembly. According to the system for assisting filtration of the nanoparticles in the ultrapure water based on the micron particles, the efficiency of Vandewatt force coagulation filtration is greatly improved, the coagulation efficiency and the removal effect of nano pollutants are remarkably improved, the operation cost is greatly reduced, the aim of efficiently and economically removing the nanoparticles is achieved, and the water quality requirement of semiconductor ultrapure water is met.

An energy system converts the latent heat energy of moist air into water and in some examples also to motive energy in dry exhaust air. It does this by flash evaporation (5) of primary air which has added water droplets (6), the supersonic speed of the primary flow from the flash evaporation nozzle creating suction to draw in ambient secondary air. A condenser tube (10) with a mixing throat (12) enhances the mixed primary / secondary air speed and causes condensation within the volume of the tube without need for heat exchanger surfaces, to provide output water and dry air at a pressure higher than atmospheric and thus providing thrust / power.

The invention relates to the technical field of VOCs waste gas purification treatment of oil and gas field produced water, in particular to a treatment device for VOCs waste gas discharged from oil and gas field produced water and a waste gas treatment method of the treatment device. An ultraviolet photolysis and power device is communicated with a VOCs waste gas input pipeline, and a pressurized waste gas output pipeline is communicated between the ultraviolet photolysis and power device and a biological purification trickling filter device; a circulating liquid input pipeline is communicated between the biological purification trickling filter device and the ultraviolet photolysis and power device, a circulating liquid output pipeline is communicated between the ultraviolet photolysis and power device and the biological purification trickling filter device, and the biological purification trickling filter device is communicated with a purified standard waste gas discharge pipeline. An ultraviolet photolysis oxidation technology is used as a pretreatment process, and then purified standard waste gas is obtained through a biological treatment process. The VOCs waste gas in the produced water of the oil and gas field is treated by adopting a green and environment-friendly process technology, the process is simple, the treatment efficiency is high, and the VOCs treatment cost of an enterprise is reduced.

The utility model discloses a flushing water pipeline structure of a wastewater pretreatment system. The flushing water pipeline structure comprises a produced water filtering pipeline for connecting a produced water tank of a coagulative precipitation tank and a sewage filter; the sludge conveying pipeline is used for connecting the sludge hopper of the coagulative precipitation tank and the sludge dewatering machine; a flushing pipeline is arranged between the produced water filtering pipeline and the sludge conveying pipeline, and the flushing pipeline is used for taking water to be filtered in the produced water filtering pipeline to flush the sludge conveying pipeline and / or equipment. According to the utility model, the water to be filtered in the produced water filtering pipeline is used as a water source, and then the sludge conveying pipeline and / or equipment are flushed through the flushing pipeline, so that the produced water in the pretreatment system is recycled, an external water source does not need to be connected, the resource utilization rate is improved, and the treatment burden of a subsequent evaporative crystallization system is reduced.

The present application relates to the technical field of water treatment, and particularly relates to a coal chemical industry reverse osmosis concentrated water treatment method, wherein the coal chemical industry reverse osmosis concentrated water is adjusted in pH value, and then sequentially filtered by a positively charged HCRNF membrane and a negatively charged NF245 membrane to realize acid nanofiltration desalting; the concentrated water obtained by the positively charged membrane and the negatively charged membrane is treated by a sodium persulfate system activated by ultraviolet light, and then returned to a front-end RO concentrated water treatment unit; the water produced by the positively charged membrane is desalted by RO1 reverse osmosis membrane deep treatment, and the produced water meets the discharge / recycle standard; and the concentrated water of the reverse osmosis membrane enters an evaporation crystallization unit. The present application takes into account efficient removal of COD and effective separation of salt, reduces energy consumption, significantly inhibits the risk of irreversible membrane surface pollution, and provides core technical support for improving the treatment efficiency and system stability of the nanofiltration unit.

The invention discloses a shale gas produced water desalination system regulated and controlled by a dynamic electric field, which comprises an electrochemical hardness removal unit (11), a microfiltration interception unit (13), a reverse osmosis desalination unit (12) and a controller (10), the electrochemical hardness removal unit (11), the microfiltration interception unit (13) and the reverse osmosis desalination unit (12) are sequentially arranged along the inflow direction, the electrochemical hardness removal unit (11) is used for removing hardness components in water through a dynamic electric field, the microfiltration interception unit (13) is used for intercepting precipitates and suspended particles, and the reverse osmosis desalination unit (12) is used for reducing salt; and the controller (10) is respectively connected with the electrochemical hardness removal unit (11) and the reverse osmosis desalination unit (12) and is used for dynamically adjusting the polarity of an electrode so as to relieve membrane pollution in an electric field transformation mode. The invention solves the problems of low efficiency and serious membrane pollution caused by hardness removal and desalination separation in the traditional shale gas produced water treatment process.

The application discloses a low-temperature water production method of an air water generator. When the ambient temperature is low, the water contained in the airflow is actively controlled to freeze on a condenser, so that the water in the air is collected. When the amount of ice in the condenser reaches a set range, the compressor is turned off, and the condenser no longer has a refrigeration effect. At this time, the air inhaled from the external environment is used to exchange heat with the ice in the condenser, so that the technical purpose of accelerating ice melting is achieved. Thus, the technical purpose of using the existing air water generator to produce water in a low-temperature environment is achieved. Without changing the hardware structure of the existing air water generator, the use temperature range of the air water generator can be extended to a low-temperature environment of 0-15 DEG C. Not only is the use temperature range of the air water generator expanded, but also the use geographical range of the air water generator is expanded.

The application provides an oily sewage treatment device, which comprises a micro-vortex coalescing cavity, a H-shaped inclined plate section and a coagulation separation cavity connected in sequence; the H-shaped inclined plate section comprises a H-shaped inclined plate, which comprises a wing and a support plate supporting the wing; the wing is configured to hinder the flow of fluid in the H-shaped inclined plate section along the length direction of the support plate. The device is pressure type, which reduces VOCs emission from the source, reduces the number of treatment equipment stages, fully utilizes the pressure energy of the incoming water, saves energy consumption and investment. By using the micro-vortex coalescing device, the coagulation reaction structure and the two H-shaped inclined plate sections, the oily sewage (such as oilfield produced water) is efficiently treated, and the oil and suspended solids in the water are removed. Through the specific structure, the length of the equipment is greatly reduced, so that the equipment is more flexible in actual use arrangement, and the length requirement of the occupied space is reduced.

Disclosed are methods and compositions for coagulating and clarifying produced waters for use as boiler feed waters, for example for the generation of steam. The methods and compositions are especially useful for treatment of produced waters from steam-injection methods of tertiary oil recovery such as steam-assisted gravitational drainage. Disclosed are compositions comprising a first copolymer having a high molecular weight and bearing a low molar cationic charge and a second copolymer having a lower molecular weight and bearing a high molar cationic charge. The compositions are suitable for addition as coagulants to produced waters that have been treated by warm lime softening. Also disclosed are methods of treating produced waters from steam-injection oil recovery for use as boiler feed waters to generate steam in such steam injection methods

1. Name of the product in this design: Portable air-to-water generator. 2. Purpose of this design: To produce water using moisture in the air and to purify the produced water for use as drinking water. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The utility model provides a low-power efficient precipitation device. The low-power efficient precipitation device comprises a destabilizer, flocculation equipment, precipitation equipment and a sludge hopper, the destabilizer, the flocculation equipment, the precipitation equipment and the sludge hopper are communicated in sequence, and the heights of the destabilizer, the flocculation equipment, the precipitation equipment and the sludge hopper are reduced in sequence along the vertical direction; the destabilizer is used for destroying the stability of mine water and comprises a barrel and a plurality of partition plates. The partition plates are arranged in the barrel body at intervals and used for dividing the space between the liquid inlet and the liquid outlet of the barrel body into a plurality of flowing sections, and communicating holes are formed in the partition plates; and the communicating holes are used for communicating the adjacent flowing sections. The device is low in operation cost and investment, smaller in occupied area, free of influence of the external environment, not prone to algae breeding and good in water quality of produced water.

The application discloses a composite oxidant suitable for shale reservoir produced water treatment and application thereof, and relates to the technical field of sewage treatment. The composite oxidant comprises an oxidant and a catalyst, and the preparation method of the catalyst comprises the following steps: taking iron salt, copper salt, manganese salt and water-soluble titanate to be dissolved in an aluminum sol solution, under the condition of continuous stirring, dropwise adding ammonia water and standing for a period of time, then taking the solid phase and washing several times with distilled water to obtain a precursor; taking the precursor, sintering under the condition of an oxygen-containing atmosphere and 400-550 DEG C for 2-5 hours, crushing and sieving, and the catalyst is obtained. The composite oxidant suitable for shale reservoir produced water treatment can effectively remove COD in shale gas produced water through the compounding of the oxidant and the catalyst, and has good reusability.

The invention belongs to the technical field of reverse osmosis ultrapure water machines, and particularly relates to a two-stage reverse osmosis ultrapure water machine and a using method thereof. The two-stage reverse osmosis ultrapure water machine comprises a raw water pretreatment unit, a first-stage reverse osmosis assembly, a second-stage reverse osmosis assembly, a middle water storage tank and a pure water output unit, the water purifier is characterized in that the raw water pretreatment unit is sequentially connected with a first-stage reverse osmosis assembly, a middle water storage tank, a second-stage reverse osmosis assembly and a pure water output unit through connecting pipelines, and the first-stage reverse osmosis assembly and the second-stage reverse osmosis assembly respectively comprise a reverse osmosis membrane shell, a reverse osmosis membrane element, a water inlet connector and a water outlet connector. The middle water storage tank is arranged between the first-stage reverse osmosis assembly and the second-stage reverse osmosis assembly through a connecting pipeline, and by arranging a multi-layer purification structure of a pretreatment device, a two-stage reverse osmosis device and a rear polishing device, impurities such as particulate matters, organic matters, residual chlorine and salts in raw water are gradually intercepted and removed, the content of impurities in produced water is greatly reduced, and the water quality is improved. Therefore, the requirements of industrial production high-precision scenes on ultrapure water are met.