45results about How to "High salt removal rate" patented technology

The invention provides a vacuum membrane distillation water-treatment plant utilizing solar energy or waste heat, which belongs to the field of water treatment. The vacuum membrane distillation water-treatment plant comprises a membrane module, a distillation box, a cooling cylinder, a vacuum pump, a control system and a circulating system. The invention uses a vacuum membrane distillation method which has the separation principle that hot raw water to be treated passes through one side of the separation membrane, and the other side is vacuumized so as to form transfer vapor pressure difference on the two sides of the membrane; and the vacuum side only generates water vapor, and the water vapor is condensed into drinking water, thereby separating and purifying the raw water. The invention utilizes cheap energy sources, such as solar energy, low-grade waste heat and afterheat, or the like, and can recycle latent heat of condensation, thereby reducing the energy consumption. The vacuum membrane distillation water-treatment plant has the advantages of simple structure, small occupied area, low cost, high desalination rate, large membrane flux and the like, and can be operated continuously and realize automatic control.

The invention discloses a preparation method of a polyamide reverse osmosis membrane containing an amphoteric carboxymethylcellulose sodium complex. The preparation method comprises the steps: firstly, preparing an amphoteric cationic polymer by a free radical polymerization method, then preparing an amphoteric carboxymethylcellulose sodium complex by an ionic crosslinking method, adding the amphoteric carboxymethylcellulose sodium complex into an aqueous phase monomer solution for preparing a polyamide membrane, and thus obtaining the polyamide reverse osmosis membrane containing the amphoteric carboxymethylcellulose sodium complex through an interfacial polymerization method. With utilization of good hydrophilicity, contamination resistance and a unique nanoparticle structure of the amphoteric carboxymethylcellulose sodium complex, the water permeation flux and contamination resistance of the membrane are greatly improved while the high salt interception rate of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 1.5 MPa at the temperature of 25 DEG C, the interception rate of the reverse osmosis membrane on NaCl is more than 97%, and the water permeation flux is more than 30 L.m<-2>.h<-1>. Therefore, the prepared polyamide reverse osmosis membrane containing the amphoteric carboxymethylcellulose sodium complex has high salt interception rate, water permeability and contamination resistance.

The invention provides an emission treatment system for high-salinity wastewater. The emission treatment system comprises a wastewater collection tank, a regulating treatment tank, a multi-medium filter, an electrodialysis treatment device, a coagulative precipitation unit, an evaporative crystallization unit, a nanofiltration unit and a reverse osmosis desalination device, wherein a water outletend of the wastewater collection tank is connected with the regulating treatment tank, an output end of the regulating treatment tank is connected with the multi-medium filter, an output end of the multi-medium filter is connected with the electrodialysis treatment device, a concentrated water outlet end of the electrodialysis treatment device is connected with the coagulative precipitation unit,a produced water outlet end of the electrodialysis treatment device is connected with the nanofiltration unit, a water outlet end of the nanofiltration unit is connected with the reverse osmosis desalination device, a water producing end of the reverse osmosis desalination device is connected with the electrodialysis treatment device, and a concentrated water outlet end of the reverse osmosis desalination device and a water outlet end of the coagulative precipitation unit are separately connected with the evaporative crystallization unit. The emission treatment system can be used for treatinghigh-concentration salt-bearing wastewater, and environmental pollution can be effectively reduced.

The present invention provides a semipermeable composite membrane having high fouling resistance against membrane contaminants; and a method for producing the semipermeable composite membrane. This semipermeable composite membrane comprises a substrate, a porous support layer disposed on the substrate, and a separation functional layer disposed on the porous support layer, wherein the separation functional layer contains: from the porous support layer side, a first layer containing a crosslinked aromatic polyamide which is a polymer of a polyfunctional aromatic amine and a polyfunctional aromatic acid chloride; and an aliphatic polyamide which is present on the first layer and which is a polymer of a polyfunctional aliphatic carboxylic acid and a polyfunctional aliphatic amine.

Provided is a composite semipermeable membrane having a high salt removal rate and a high water permeability. The composite semipermeable membrane comprises a substrate, a porous support layer formed on the substrate, and a separation functional layer formed on the porous support layer, the hydrophilic macromolecule concentration on the substrate-side surface of the porous support layer being higher than that on the separation functional layer-side surface.

The invention relates to a novel high-throughput positively charged nanofiltration membrane and a preparation method thereof. The novel high-flux positively charged nanofiltration membrane includes a porous support layer and a positively charged nanofiltration selective layer; the positively charged nanofiltration selective layer is formed by interfacial polymerization of an aqueous phase solution and an oil phase solution and then subjected to heat treatment The aqueous phase solution is an aqueous solution containing a hydrophilic polyamine monomer and an aqueous phase additive, and the aqueous phase additive includes a surfactant and a proton accepting agent; the oil phase solution is an acid chloride monomer dissolved in an organic solvent solution. The nanofiltration membrane prepared by the preparation method of the invention has large flux, stable performance, high salt removal rate and high removal rate for positive ions. In addition, the preparation method provided by the invention is simple and easy to control, has good reproducibility, short preparation time, and low preparation cost, which is beneficial to realize the production of industrialized high-throughput positively charged nanofiltration membranes.

The invention discloses a composite nanofiltration membrane. The composite nanofiltration membrane uses a modified meta-aramid hollow fiber membrane as a base membrane, and adopts polyamines, diaminobenzene fluorides and polyacyl chlorides to pass through the interface on the base membrane. The polymerization reaction forms an ultrathin polyamide layer and provides a method for preparing this composite nanofiltration membrane. Adopt the technical scheme of the present invention, the pure water flux of the prepared composite nanofiltration membrane under 0.5MPa ≥ 50L / (m 2 h), the desalination rate to 2g / L divalent cation salt solution is more than or equal to 80%, and the required cost is low, and it is easy to industrialize; in addition, the preparation method adopted is simple, the reaction conditions are mild, the performance is stable, and it has a large market application prospects.

The invention provides a zero release device of high-salt high-ammonia-nitrogen waste water. The zero release device is mainly used for solving problems of conventional devices that discharge standards are not reached, and water resource recovery rate is low in high-salt high-ammonia-nitrogen waste water treatment. The zero release device is a membrane coupling device, and mainly comprises a membrane absorption unit, a nanofiltration unit, a forward osmosis unit, and a cooling crystallization unit; the membrane absorption unit is connected with the nanofiltration unit, the nanofiltration unit is connected with the forward osmosis unit, the forward osmosis unit is connected with the membrane absorption unit and the cooling crystallization unit, and a plurality of circulation loops are formed via connection of the units. The zero release device is easy for operation, and is easy for realization. The zero release device can be used for solving processing problems of high-salt high-ammonia-nitrogen waste water effectively, water recovery rate is high, and quality of obtained water is high. The zero release device is used for circulating condensation of high-salt high-ammonia-nitrogen waste water, almost no concentrated water is discharged, and recovery of water resource of high-salt high-ammonia-nitrogen waste water is realized as far as possible.

The invention discloses a preparation process of an epoxy modified reverse osmosis membrane, the reverse osmosis membrane and application of the reverse osmosis membrane. The preparation process comprises the following steps: 1) performing surface hydrophilic modification on a polyolefin porous support layer; 2) carrying out surface coating on the polyolefin porous supporting layer obtained in the step 1) by adopting epoxy resin to obtain a polyolefin substrate film; 3) contacting the polyolefin substrate membrane with a water-phase solution of polyfunctional aromatic polyamine, then contacting the polyolefin substrate membrane with an oil-phase solution of polyfunctional aromatic acyl chloride, and carrying out interfacial polymerization reaction to form a composite membrane containing polyamide; 4) exposing the composite membrane in a nitrous acid solution for post-treatment; and rinsing and drying to obtain the epoxy modified reverse osmosis membrane. The reverse osmosis membrane prepared by the method has the performance of high desalination rate on the basis of obtaining high flux through hydrophilic modification.

The invention discloses an electro-adsorption desalting regeneration system and a regeneration process, relating to the field of water treatment and solving the problems that the regeneration of a secondary electro-adsorption module is more thorough and the adsorption efficiency is lower in the prior art. The regeneration system comprises a first electro-adsorption module and the second electro-adsorption module, and further comprises a control module, a first electric module and a second electric module, wherein the secondary electric module is used for enabling the secondary electro-adsorption module in a short-circuit state before the secondary electro-adsorption module finishes the regeneration, and enabling the secondary electro-adsorption module in an electrifying state after the secondary electro-adsorption module finishes the regeneration and before the first electro-adsorption module finishes the regeneration; the first electric module is used for enabling the first electro-adsorption module in the short-circuit state before the first electro-adsorption module finishes the regeneration; and the control module is used for controlling the short-circuit state and the electrifying state of the first electric module and the second electric module. According to the invention, the loads of the first electro-adsorption module and the second electro-adsorption module can be regulated to be more reasonable by fully utilizing the capability of the secondary electro-adsorption module so as to enable a running process of the module to be more compact.

The invention provides an anti-oxidation and anti-biological pollution reverse osmosis membrane, a preparation method and application thereof. The reverse osmosis membrane comprises a polysulfone porous support layer and a polyamide desalination layer formed on the polysulfone porous support layer, and the polyamide desalination layer contains a blend of polyhydroxy flavone and small molecule aminocarboxylic acid inside or on the surface. Salt rejection rate and permeation flux evaluation experiments, oxidation resistance evaluation experiments and biofouling resistance evaluation experiments show that compared with common reverse osmosis membranes, the reverse osmosis membrane prepared by the present invention has better oxidation resistance and better biofouling resistance. powerful.

The invention provides a low-energy-consumption high-flux reverse osmosis membrane and a preparation method and application thereof. The structure of the reverse osmosis membrane includes a polysulfone porous support layer and a polyamide desalination layer formed on the support layer. The polyamide desalination layer Contains a hydroxysulfonate and alcohol amine blend internally or on the surface. The reverse osmosis membrane provided by the invention has the characteristics of low energy consumption, high hydrophilicity, high water yield and the like, and can be widely used in water treatment fields such as industrial water supply and waste water reuse.