376results about How to "High desalination rate" patented technology

A composite semipermeable membrane which satisfies the following relationship when seawater at 25° C. having a pH of 6.5, a boron concentration of 5 ppm and a TDS concentration of 3.5% by weight is permeated under an operation pressure of 5.5 MPa: Boron removal ratio (%)≧95−4×membrane permeation flow rate (m3 / m2·day).

The invention relates to a recycling treatment method for salt-containing wastewater. The recycling treatment method is characterized by comprising the following steps: (1) carrying out desalting, concentrating and initial hard water removal on the salt-containing wastewater through a general electrodialyzer at first, returning obtained low-salt wastewater to a desalting process for preparing pure water, and carrying out deep hard water removal on high-salt wastewater through ion exchange; (2) pumping the preprocessed high-salt wastewater into a bipolar membrane electrodialyzer for recycling treatment, dissociating sodium chloride and water for greatly reducing the content of salt in the wastewater, and obtaining hydrochloric acid and sodium hydroxide at the same time; returning the obtained low-salt wastewater to a water concentration chamber of the general electrodialyzer for concentrating again. According to the recycling treatment method, the environmental pollution caused by direct discharge of the high-salt wastewater is avoided, wastes (salt) are turned into wealth (acid and alkali), the water recovery rate of a salt water removal process is increased, the integral water preparation cost is remarkably reduced, and good economic and social benefits are achieved.

The invention relates to a recycling method for treating ammonia nitrogen containing high-salt catalyst wastewater by adopting a membrane separation technology. The process flow of 'acid regulation, micro-filtration, membrane distillation, cooling and crystallization' is adopted in the method. By adopting the process flow, salts, ammonia nitrogen and metal ions in the wastewater can be effectively removed, and deep treatment and recycle of the ammonia nitrogen containing high-salt catalyst wastewater are realized. The process flow makes full use of the technical advantages of membrane distillation, solves the problem that the discharge of high salts, ammonia nitrogen and metal ions of the ammonia nitrogen containing high-salt catalyst wastewater does not reach the standards, and realizes recycle of the produced water. After the ammonia nitrogen containing high-salt catalyst wastewater is treated by the process flow, the reclamation rate of the wastewater is more than 90 percent, and high recycle of the ammonia nitrogen containing high-salt catalyst wastewater is realized; and the method accords with the development strategies of energy conservation and emission reduction, and has remarkable social benefit and economic benefit.

The invention discloses a compound reverse osmosis membrane with interpenetrating network desalting layer and a preparation method of the membrane. The desalting layer consists of a stereoscopic network which is formed by interpenetrating macromolecule nanogel and polyamide. The preparation method comprises the following steps of: pre-adding hydrophilic and / or oleophylic macromolecule nanogel with good dispersion into a solvent of solution A and / or B, preparing a water phase A solution containing m-phenylenediamine and / or p-phenylenediamine, preparing an organic phase B solution containing trimesoyl chloride, enabling the solution A and the solution B to fully contact on a porous support carrier for interface reaction, rinsing by using deionized water, carrying out moisturizing treatment by using glycerol, and drying. The compound reverse osmosis membrane disclosed by the invention has a sodium chloride removal rate of not less than 99% and a flux of not less than 25GFD (Geophysical Fluid Dynamics) under a pressure of 225psi; the microstructure and the charge property of the desalting layer can be regulated and controlled through the macromolecule nanogel so that the reverse osmosis membrane with high anti-pollution capability is prepared; and the compound reverse osmosis membrane can further be used for developing novel low-pollution reverse osmosis membranes.

The invention discloses a method for preparing a reverse osmosis composite membrane containing a modified nano-zeolite molecular sieve. The method comprises the following steps that silane coupling agent, a nano-zeolite molecular sieve and toluene are mixed for modification reaction, and reactive fluid is filtered, washed and dried after the modification reaction is finished so as to obtain the nano-zeolite molecular sieve, the surface of which is modified; the nano-zeolite molecular sieve with the modified surface is dispersed into polybasic acyl chloride solution so as to obtain mixture; inaddition, a polysulfone support membrane is immersed in water solution of polybasic amine, the membrane is taken out and solvent is removed, the membrane with no solvent and the mixture are subjectedto interfacial polymerization reaction, and the reverse osmosis composite membrane containing the modified nano-zeolite molecular sieve is obtained through subsequent treatment after the interfacial polymerization reaction is finished. The method for preparing the reverse osmosis composite membrane containing the modified nano-zeolite molecular sieve has simple process, and the prepared reverse osmosis composite membrane has good mechanical strength, high salt rejection rate, and high water flux.

The invention discloses a complex reverse osmosis membrane which comprises a non-woven fabric layer and a polysulfone supporting layer, wherein a crosslinked polyamide layer which uses polyamine and an organic solution containing an acyl halide compound for interfacial synthesis is arranged on the polysulfone supporting layer. In the invention, the polyamine and the organic solution containing the acyl halide are adopted on the polysulfone supporting layer of the prior reverse osmosis membrane to obtain the polyamide layer with a three-dimensional crosslinked structure through interfacial condensation, thus the performance of the complex reverse osmosis membrane is further improved, and the membrane molecules have better compactness and stronger rigidness, wherein the improved compactness can improve the salt rejection rate of the membrane, and the improved rigidness can enable the membrane to have excellent anti-densification performance, thus the rate of decay of the performance of the membrane can be reduced, and the service life of the membrane can be prolonged. Therefore, the complex reverse osmosis membrane has the advantages of high salt rejection rate, large water flux, long service life and obvious reduction of engineering investment and production cost, and can be widely applied to the fields of electricity, metallurgy, petroleum and petrochemical industry, medicine, food, municipal engineering, seawater desalination, and the like.

A composite semipermeable membrane, which comprises a separating functional layer comprising a reactant of polyfunctional amine with polyfunctional acid halide, wherein a water-soluble organic material is in contact with the separating functional layer, and the separating functional layer has a boron removal ratio of 95% or more, when seawater at 25° C. having a pH of 6.5, a boron concentration of 5 ppm and a TDS concentration of 3.5% by weight is permeated under an operation pressure of 5.5 MPa.

The invention relates to a production technique and device of directly edible syrup. The method comprises the following steps: pressing sugar cane with a juice press to obtain a sugar cane juice; prefiltering the sugar cane juice through a coarse filter, and filtering with a microfiltration membrane to obtain a sucrose juice clear solution; concentrating the sucrose juice clear solution through a nanofiltration membrane to obtain a concentrated solution; sending the concentrated solution into a first ion exchange resin tower to obtain a first permeation solution; sending the first permeation solution into a second ion exchange resin tower to obtain a second permeation solution; and concentrating the second permeation solution in an evaporator to obtain a refined concentrated solution, adding additives and uniformly mixing to obtain the syrup. The product produced by the production technique provided by the invention has the advantages of low chromatic value, high desalting rate and high yield.

The invention provides a preparation method of a hybridization reverse osmosis membrane. The preparation method of the hybridization reverse osmosis membrane comprises the following steps: taking 10-20 parts of polysulfone, a pore-forming agent and a nano porous material so as to prepare a membrane preparation solution, then coating the membrane preparation solution on a support layer uniformly, removing the residual membrane preparation solution so as to obtain a hybridization ultrafiltration base membrane, then soaking the hybridization ultrafiltration base membrane in a water phase solution, taking out, and removing the residual water phase solution on the surface, wherein the water phase solution contains aromatic polyamine, aliphatic polyamine and / or alicyclic polyamine; soaking the obtained product into an oil phase solution, taking out, drying, and rinsing so as to obtain the hybridization reverse osmosis membrane. The acidification or oxidation and other after-treatment methods are not required for the preparation method of the hybridization reverse osmosis membrane; the desalting rate is prevented from being decreased due to the damage to a desalting layer; the service life of the membrane is ensured, and meanwhile, good flux and desalting rate are kept; moreover, the method is simple and convenient, and can be used for industrial production.

The invention discloses an anti-pollution reverse osmosis membrane and a preparation method thereof. The anti-pollution reverse osmosis membrane comprises a non-woven fabric, a polysulfone supporting layer, a polyamide desalination layer containing polyvinyl alcohol (PVA) molecules and a PVA cross-linking coating. According to the anti-pollution reverse osmosis membrane, the PVA molecules are introduced into the polyamide desalination layer, part of hydroxyl on the PVA molecules, amino of m-phenylenediamine and acyl chloride perssad are reacted to form the polyamide desalination layer, and the rest hydroxyl and hydroxyl which is later coated on the PVA molecules jointly participate in the reaction for generating the PVA cross-linking coating so that the polyamide desalination layer and the PVA cross-linking coating are combined together through chemical bonds, and adhesion of the PVA cross-linking coating is improved. The reverse osmosis membrane has the advantages of being anti-pollution, high in flux, high in desalinization ratio and easy to prepare.

The invention discloses an oxidation resistant composite reverse osmosis film, which comprises the following parts: nonwoven fabrics and polysulfone support layer, wherein the polyamide layer prepared by acyl chloride organic solution constituted by polyamine and modified polyacylchloride solution or polyamine and pyromellitic triformyl chloride and modified polyacylchloride on the polysulfone support layer. The invention improves the oxidization proof property and organic pollution proof property of the reverse osmosis film to lengthen the using life of the reverse osmosis film, which has easy preparation and operation, high desalinization rate and large water flux, therefore fitting for water disposing course in wider domain to expand the application of the reverse osmosis film.

The invention discloses a processing method and a processing apparatus of landfill leachate. The processing method comprises steps of pretreatment, anaerobic treatment, membrane biochemical treatment, nanofiltration treatment, and sludge treatment and the like. And the processing apparatus includes a primary settling tank (1) and a regulating tank (2). The regulating tank (2) is connected with an anaerobic reactor (3) which is connected with a denitrifying tank (4); the denitrifying tank (4) is communicated with a nitration tank (5), which is connected with ultrafiltration equipment (6); and the ultrafiltration equipment (6) is connected with nanofiltration equipment (7). According to the invention, COD of the high-density wastewater is degraded. After processing, high-density COD of 50,000 to 60,000mg / L is degraded to COD of about 50 mg / L, which reaches the standard of industrial reused water. Moreover, zero discharge of leachate is realized. Therefore, a new attempt to treat the high-density leachate is initiated and the domestic blank is filled.

The invention provides a polyamide composite reverse osmosis membrane containing nano materials. The polysulfone solution of the membrane is prepared from the following raw materials by weight: 15-30 parts of polysulfone, 45-75 parts of organic solvents, 0.5-40 parts of organic pore-forming agents and 0-30 parts of nano inorganic materials. The method of membrane preparation by phase inversion is adopted on the polysulfone porous layer and in the preparation process, the polysulfone is taken as the polymer matrix and the organic pore-forming agents and the nano inorganic materials are added after the organic solvents are added. Addition of the organic pore-forming agents can increase the void ratio of the membrane, thus greatly improving the water flux of the membrane. Addition of the nano inorganic materials reduces the defect rate of the formed membrane, ensures the formed polyamide layer to be denser in the subsequent interfacial polymerization procedure, greatly improves the desalination rate of the membrane, ensures the mechanical strength of the membrane to be compensated and improves the compaction resistance of the reverse osmosis membrane under the condition of ensuring the desalination rate and the water flux, thus prolonging the service life of the membrane.

The invention provides a polyamide composite sea water desalination film. The polyamide composite sea water desalination film comprises a supporting base layer and a polyamide functional layer; the polyamide functional layer is prepared from m-phenylenediamine, a polyamine compound and a poly-acyl chloride compound by reacting; the polyamine compound is selected from an aza-aromatic nucleus polyamine compound and an aliphatic polyamine compound. The polyamide composite sea water desalination film has the advantages that a polyamine compound polymeric monomer is added to water phase to improve the crosslinking degree of the polyamide functional layer; therefore, the bearing capacity of the sea water desalination film under high seepage pressure can be improved, and moreover, the desalination rate can be raised while high throughout is ensured. The invention also provides a preparation method of the compound sea water desalination film. The sea water desalination film is high in desalination rate and high in water throughout; the preparation method is simple, the technological process is short, and the cost is low, so that a good application prospect is brought.