200 results about "Membrane stack" patented technology

The present application discloses a membrane stack comprising a first and second membrane layers, and a spacer layer disposed between said first and second membrane layers, said membrane stack configured such that fluid passes through said membrane stack in a direction substantially perpendicular to the plane of said membrane layers and said spacer layer. The application also discloses a module comprising a membrane as described above, said module having a fluid flow path that is substantially perpendicular to the plane of the major surface of the membrane and spacer layers in said membrane stack.

The invention relates to the field of industrial wastewater treatment processes and provides a multi-stage countercurrent electrodialyzer reversal-based method for treating saline wastewater in the coal chemical industry. The method comprises the following steps: 1) carrying out catalytic ozonation treatment on the saline wastewater in the coal chemical industry; 2) carrying out multi-media filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 1) in sequence; and 3) treating the effluent obtained after membrane filtration in the step 2) with a multi-stage countercurrent electrodialyzer reversal, thus achieving deep treatment, desalting and recycling of the saline wastewater in the coal chemical industry, wherein the multi-stage countercurrent electrodialyzer reversal comprises an electrodialysis membrane stack unit, a frequency reversal control unit and an online monitoring and process control unit. The method has the advantages of high fresh water recovery rate, low concentrated water discharge, low operating cost, stability in system operation and the like and can avoid the problems of low fresh water recovery rate, low concentration multiple, high treatment cost, serious membrane pollution, instability in system operation and the like in the routine techniques.

The invention relates to an electrodialysis device applicable to treatment on high-salinity wastewater from industries such as coal chemical industry. The electrodialysis device comprises an electrodialysis membrane stack unit, a frequent polarity conversion control unit and an online monitoring and process control unit, wherein the electrodialysis membrane stack unit consists of a plurality of membrane stacks which are connected with one another in series through pipelines in a desalted department, a concentrated department and a pole compartment respectively and form a multi-level inversion system with solution flow direction control; a programmable logic controller (PLC) unit, a rectifier and a solenoid valve are used for implementing frequent polarity conversion; and solutions in the desalted department and the concentrated department can be cycled or partially cycled, thereby obtaining a high fresh water recovery rate and a high concentrated water concentration multiple. The electrodialysis device can fundamentally solve the problems of low fresh water recovery rate, low concentrated water concentration multiple, high energy consumption and difficulty in long-term and stable operation in the process of treating the high-salinity wastewater in the coal chemical industry and the like by an ultrafiltration-reverse osmosis method, and thus the engineering application of the electrodialysis treatment technology for the high-salinity wastewater in the industries such as the coal chemical industry is promoted.

The present invention relates to a process for treating sodium sulfate wastewater by using a nanofiltration-reverse osmosis combined membrane. According to the process, the pretreated sodium sulfate wastewater is conveyed to a nanofiltration membrane stack through a high pressure pump, and the nanofiltered concentrated solution is subjected to multiple effect evaporation crystallization to obtain an anhydrous sodium sulfate product and condensed water, wherein the condensed water is recycled; the nanofiltered producing water is conveyed to a reverse osmosis membrane stack through the high pressure pump, the resulting concentrated solution returns to the pretreated sodium sulfate stock solution to carry out the secondary nanofiltration, and the reverse osmosis producing water is recycled, wherein the concentrated solution is subjected to the reverse osmosis membrane stack. Compared to other pollution control technologies, the process of the present invention has the following advantages that: the equipment is compact, and the land occupation is small; no morphological and chemical influence is generated to the treated object; the process is a continuous process, and the automatic and uninterrupted operating can be achieved; the process has characteristics of low energy consumption, no phase change, no temperature change, easy control and simple operation; the process can be directly circulated on the site; the sodium sulfate is subjected to concentration, evaporation crystallization, and recovery utilization in the absence of chemical and physical changes, such that the zero discharge of the sodium sulfate wastewater is achieved; the reverse osmosis producing water is adopted as the process pure water to use so as to save a large amount of the process water.

The invention discloses an immersion-type hollow fibrous membrane component and complete equipment thereof and belongs to the technical field of manufacturing a membrane component through water treatment. The immersion-type hollow fibrous membrane component consists of membrane silk bundles, membrane end sockets and a central supporting tube; the membrane silk bundles have at least four bundles and are distributed on the periphery of the central supporting tube; two ends of the membrane silk bundles are provided with one membrane end socket respectively, wherein one membrane end socket is a gas inlet end socket; and the other one is a water producing end socket. A plurality of membrane components can be combined into a small unit and a large unit till membrane stacks on the equipment so as to improve service life of the membrane silk and the membrane component; and the structural design of the membrane component concentrates the advantages that the prior strip curtain-type membrane component is uneasy to pollute and the prior columnar membrane component has large membrane filtering area into a whole and has the advantages of large membrane filtering area, convenient mounting of the membrane component, convenient maintenance 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 a self-cleaning filtering membrane device which comprises a membrane shell and a central tube, wherein the central tube passes through the membrane rotatably and horizontally, one end of the central tube is fixedly connected with a filtering membrane stack, the other end of the central tube is fixedly connected with a rotating device, the filtering membrane stack and the rotating device are both positioned in the membrane shell, a spraying device is arranged on the membrane shell and above the filtering membrane stack, and a liquid outlet is arranged at the bottom of the membrane shell; a through hole is formed on the part, corresponding to the filtering membrane stack, of the central tube; a guide hole is formed on the part, corresponding to the rotating device, of the central tube; and the rotating device is rotatably arranged by virtue of the liquid flowing out of the guide hole. In the embodiment of the invention, the rotating device drives the central tubeand the filtering membrane to rotate continuously, and the surface of the filtering membrane is flushed and cleaned all the time since liquid is continuously sprayed on the filtering membrane stack by the spraying device.

The invention belongs to the non-biodegradable organic effluent treatment technical field and particularly relates to a membrane electric coupling technology. The technology is an effluent treatment method that a DC electric field, iron-carbon micro-electrolysis and tubular carbon separation membrane are coupled organically to perform high-efficiency electrochemical oxygenolysis to remove main harmful pollution sources in non-biodegradable effluent produced by industries such as pharmacy, printing and dyeing, so as to realize complete degradation of the non-biodegradable biodegradable organic effluent or convert the non-biodegradable effluent to harmless or degradable low-level organic substances. The technology has advantages of low operation cost, easy installation, membrane stack negative pressure effluence, low working pressure; at the same time, the added DC electric field lower than 10v strengthens the electrochemical reaction effectively, has strong adaptability to acid, alkaline and high temperature of effluent, and can reduce the COD of the non-biodegradable effluent by more than 90 percent and the chromaticity removal ratio can reach over ninety-nine percent with single-stage effluence, notably increasing the solid-liquid separation efficiency and improving the quality of the effluence significantly, and the quality of effluence is stable.

The invention provides a process technology of the pharmaceutical wastewater, which has the steps as follows in turns: preprocess system, ozone disinfection, softening, cartridge filtration, one-pass RO, two-pass RO, ozone disinfection, 254nm ultraviolet disinfection, EDI, active carbon filtration, 185nm ultraviolet disinfection and terminal filter. The invention adopts the disinfecting method combining the ozone and the ultraviolet radiation. The 254nm ultraviolet disinfection can not only function as disinfection but also can remove the remnant ozone and save the ozone removing equipments. The invention adopts EDI instead of the mixed bed resin to realize regeneration while exchanging and produce pharmaceutical water with high quality continuously, and the amount of the ion exchange resin only equals to 5 per cent of the traditional process. Compared with the mixed bed resin, the EDI can realize the continuous effluent, save the regeneration time of the resin and increase the utilization rate of the equipments. The invention combines the EDI and the RO, which effectively reduces the raw water hardness and is beneficial for the EDI membrane stack to operate stably for a long period; at the same time, the invention is beneficial for the fresh chamber water to dissociate and produce enough H+ and OH+, thereby realizing the electrochemical regeneration of the ion exchange resin.

The present invention provides a central core element for separator assemblies useful in the purification of fluids, for example separator assemblies useful for the desalination of seawater. The central core element provided by the present invention comprises at least two porous exhaust conduits wherein each porous exhaust conduit comprises an exhaust channel and one or more openings which allow fluid communication between an exterior surface of the porous exhaust conduit and the exhaust channel. The central core element defines a cavity into which may be disposed a first portion of a membrane stack assembly. In the preparation of a separator assembly comprising the central core element provided by the present invention, a second portion of the membrane stack assembly forms a multilayer membrane assembly disposed around the central core element. Also provided are central core elements for salt separator assemblies and spiral flow reverse osmosis devices.

A tension control system in plastic packaging film production line consists of three tension sections connected in series. One tension section is between upper traction and lower traction; another tension section is between the lower traction and friction coil; and the last tension section is between the friction coil and center coil. An upper traction motor, a lower traction motor and a friction coiling motor respectively have a specified value of a datum value, the lower traction motor, the friction coiling motor and a center coiling motor respectively have a specified value of given tension. Each tension section specified value and feedback value are both transmitted to a controller for PID operation. The controller transmits control signals to implement the control over the three tension sections with different tension requirements. By implementing the control over separate sections according to different tension requirements, the invention leads to the overall speed linkage of the whole machine as well as stable operation, has no phenomena such as membrane breaking, excessive stretch caused by oversize tension, as well as membrane stacking, loose winding and the like caused by undersize tension, further improves the quality and precision of product and reaches the production line with advanced international standard.

The invention relates to a wide-angle-incidence infrared cutoff optical filter without a half-wave hole and a membrane system design method thereof. The wide-angle-incidence infrared cutoff optical filter comprises a substrate, a first membrane stack, a second membrane stack and a third membrane stack, the first membrane stack is deposited on the upper surface of the substrate, the second membranestack is arranged on the upper surface of the first membrane stack, the third membrane stack is arranged on the upper surface of the second membrane stack, the shapes of optical thickness coefficientcurves of high-refractive-index material membrane layers and low-refractive-index material membrane layers of the same membrane stack of the first membrane stack and the second membrane stack are thesame, and the curve shapes are 0-pi sinusoidal waveform or pi-2pi sinusoidal waveform. According to the infrared cutoff optical filter obtained by preparation, when the incident angle is 0-40 degrees, the transmittance of a visible wavelength region is not locally decreased, the half-wave hole is avoided, the average transmittance of the 400-650 nm waveband is greater than 94%, the balance of colors of lights through the infrared cutoff optical filter is guaranteed, and the imaging colors are real.

The invention relates to an electric demineralizer, particularly relates to a plate electric demineralizer. The demineralizer comprises anodes, cathodes and anion exchange membranes and cation exchange membranes between the anodes and the cathodes. One pair of anion exchange membrane and cation exchange membrane forms a concentrate water chamber or a dilute water chamber, the concentrate water chamber and the water dilute chamber are in alternative arrangement, the pair of the anion exchange membrane and the cation exchange membrane is divided into a front membrane stack and a back membrane stack by an electrode water distribution plate, the concentrate water chamber and the dilute water chamber of the two parts of membrane stacks are provided with a partition board inside respectively, the dilute water chamber of the back membrane stack is also filled with ion exchange resin. The invention mainly provides a plate electric demineralizer which can not only reduce the water feed requirements of Electrodeionization (EDI) greatly and save the investment cost for a second-class reverse osmosis device, but also ensure higher quality of the water product; solve the technical problem of high requirements for EDI water feed in the prior art. A pre-demineralizer needs to be increased at the front end so as to improve the quality of water.

The invention discloses a method for preparing methanesulfonic acid by utilizing a bipolar membrane electrodialysis technology. The method comprises the following steps: treating a sodium methanesulfonate aqueous solution used as a raw material by virtue of a microporus filter; introducing the solution into a feed liquid chamber to perform bipolar membrane electrodialysis treatment; stopping operation when the conductivity of the feed liquid is reduced to be 2000mu s/cm or below, obtaining a methanesulfonic acid solution in an acid chamber, and recycling the alkaline solution in an alkaline chamber. In the bipolar membrane electrodialysis process, the membrane stack treatment is performed by adopting the two-compartment structure, three-compartment structure and four-compartment structure of bipolar membrane electrodialysis, and the yield of the methanesulfonic acid is effectively improved. According to the designed bipolar membrane four-compartment structure, introduction of sodium ions can be effectively blocked in the preparation process, and high-purity methanesulfonic acid is obtained. According to the method disclosed by the invention, the raw material cost is low, the alkali liquor is recycled, and the preparation cost is saved. Moreover, secondary environmental pollution in the traditional organic synthesis method is avoided, and the safety level is improved.

The invention discloses a novel high-efficiency filtering water treatment membrane stack. The novel high-efficiency filtering water treatment membrane stack comprises a membrane stack body adopting fixed rings on two ends to fasten a plurality of disc-type membranes which are stacked in a separating manner and sealing rings in a serial connection manner onto a water collection pipe, wherein a spacing net which sleeves the water collection pipe is arranged between every two adjacent disc-type membranes and comprises an installation ring which sleeves the water collection pipe, a plurality of guide pieces which are regularly distributed at the outer side of the installation ring and connected with the installation ring to form a whole body and guide oblique openings formed in the edge of at least one side surface of each guide piece. The spacing nets in various shapes are ingeniously arranged between the adjacent disc-type membranes to separate the adjacent membranes, so that the requirements of various application fields can be met; and water treatment liquid is guided among the membranes, so that the binding of each two adjacent membranes is effectively avoided, the contact area between a membrane face and treatment water is increased under the situation of not increasing the overall size of the membrane stack, the water treatment efficiency is improved, and the service life is prolonged.

The invention provides an ultra-pure water preparation system and method capable of preventing a electrodeionization device from scaling. The preparation system is mainly composed of a raw water pretreatment system, a reverse osmosis system and an electrodeionization system. The raw water pretreatment system comprises a raw water booster pump, a mechanical filter, an active carbon filter and a precision filter, raw water enters the booster pump through a pipeline, and the mechanical filter, the active carbon filter and the precision filter are sequentially connected to the back of the booster pump; the reverse osmosis system comprises a high-pressure pump and a first-grade reverse osmosis device which is composed of a membrane component, a membrane shell, a pipe valve and a control system; the electrodeionization system comprises a fresh water pump, an EDI membrane stack and a rectifier; a water producing tank arranged at the back of the first-grade reverse osmosis device is connected to the membrane stack through the fresh water pump, the rectifier provides an electric field to form a membrane stack electric current, ion exchange resin in the EDI membrane stack continuously removes anions and cations in water through ion exchange, and the ultra-pure water is produced.

The invention provides a technology and a device for removing heavy metal ions in electroplating wastewater, and belongs to the electroplating wastewater treatment technology. The continuous electrodeionization technology is employed to remove heavy metal ions with low concentrations in a solution and recyle the metal ions, which plays an important role in environmental protection. The metal ions which go into a membrane stack are transferred towards the direction of a cathode 8, penetrate a membrane 9, and go into a concentration chamber 13. The metal ions are subjected to enrichment in cyclic concentrated water, and as time goes by, high enrichment factor and high removal efficiency can be obtained. The device can remove and enrich single heavy metal ion or mixed heavy metal ions in waste water continuously, and has advantages of low energy consumption, minimal environment pollution and the like.

The invention relates to a recycling method of waste acid from a stainless steel acid washing process, comprising the following steps of: (1) adding water soluble alkali in waste acid to adjust the pH to alkalescence and enable metal ions to generate hydroxide deposition; (2) filtering the hydroxide deposition by adopting a press filtering method, discharging filter cakes outside and collecting the filtrate; and (3) pumping the filtrate into a bipolar-membrane membrane stack, applying electrolysis voltage at the two ends of the membrane stack to generate mixed acid, alkali and dilute salt solution to be respectively discharged through different pipelines. The mixed acid obtained from the method can be reused in an acid washing process, and the alkali can be reused for neutralizing the waste acid in the step (1). Therefore, the invention can realize regeneration of waste acid and the recycling of the alkali, avoid reducing acid washing quality, keep the stable components of acid washing solution and improve the acid washing quality. The invention also has the characteristics of reducing the acid consumption for acid washing, reducing the discharge of acid liquor, reducing the production cost, improving the environment, enhancing the production efficiency and the like.

The invention belongs to the technical field of membrane method water treatment equipment and relates to a solar photovoltaic power generation water treatment device. According to the device, an electrodialysis membrane stack and an electrodialysis water pump are connected and assembled in an electrical information manner to form an electrodialysis device; a solar cell is fixedly connected with a controller; electric energy generated by the solar cell is distributed through a controller; the controller is connected with a storage battery, an inverter and the electrodialysis membrane stake respectively in an electrical information manner; 25-35 percent of electric energy is transferred into the inverter, the inverter converts the electric energy into alternating current for the electrodialysis water pump, and the utilization rate of the electric energy converted by the inverter is 90 percent; 65-75 percent of electric energy directly acts on the electrodialysis membrane stack to supply power, and the utilization efficiency of the electric energy is 98 percent; and excessive electric energy is controlled and transmitted to the storage battery for storage so as to be used when the sunshine is insufficient. The device is simple in structure, convenient to use, high in electric energy utilization efficiency and sufficient in power supply and can be used for desalinization of seawater and brackish water and clean production of acid and base.

The invention provides a device for preparing potassium sulphate. The device comprises a membrane stack, a cathode, an anode, a first electrolyte sampling device, a second electrolyte sampling device, a first saline solution sampling device, a second saline solution sampling device, a third saline solution generation device, a fourth saline solution generation device and a power supply. The cathode is connected with the negative electrode of the power supply. The anode is connected with the positive electrode of the power supply. The cathode and the anode are arranged on the two sides of the membrane stack respectively. Six partition chambers including the cathode chamber, the anode chamber, the first salt chamber, the second salt chamber, the third salt chamber and the fourth salt chamber are formed in the membrane stack. According to the device for preparing potassium sulphate, ammonium sulfate serves as a supply source of sulfate ions, potassium chloride is converted into potassium sulphate, the whole process can be conducted at the normal temperature, the energy consumption is low, no strong corrosive substances are generated, and corrosion to devices is small. The process flow is simple, and the mechanization and automation are easy to achieve.

The invention discloses a novel water treatment membrane stack which includes a plurality of disk-type membrane sheets, a plurality of sealing rings, two fixing rings, and a water collecting tube. A mounting through hole, of which the diameter is matched with the outer diameter of the water collecting tube, is disposed in the center of each disk-type membrane sheet. The sealing rings are matched with the mounting through holes. A plurality of water outlet holes are formed in the water collecting tube. N disk-type membrane sheets and (N+1) sealing rings are arranged successively at interval, so that each disk-type membrane sheet is clamped between each two sealing rings, wherein the sealing rings are arranged correspondingly to the mounting through holes. The water collecting tube passes through the mounting through holes and inner rings of the sealing rings to connect all of the disk-type membrane sheets and the sealing rings in series. All of the disk-type membrane sheets and the sealing rings are fixed onto the water collecting tube by arranging the two fixing rings on the sealing rings at two ends respectively. By means of the disk-type membrane sheets which are assembled cylindrically in series, a structure that water enters through periphery and is discharged from the center is formed, thereby greatly reducing the occupied volume of the membrane stack on the basis of ensuring enough membrane contact area.