375results about How to "High desalination rate" patented technology

Cast semi-permeable membranes made from synthetic polymer used in reverse osmosis, ultrafiltration and microfiltration are treated with a non-leaching antimicrobial agent to prevent its bio-fouling and bacterial breakthrough. The semi-permeable membranes include a polymeric material and a non-leaching antimicrobial agent that is incorporated into and homogeneously distributed throughout the polymeric material. The polymeric material, in the case of one membrane, may be cellulose acetate. In the case of thin film composite polyamide membranes, the antimicrobial agent is incorporated in a microporous polysulfone layer that is sandwiched between a reinforcing fabric and an ultrathin polyamide material. The invention also includes a treatment of flat and hollow fiber semipermeable membranes made with polysulfones and polyvinylidene fluoride.

The invention discloses a reclaimed craft to dispose electroplating waste water, which comprises the following steps: adopting oxidation-reduction and chemical precipitation disposing method and film technology (fold filtration, hyperfiltration, Na filtration and reverse osmosis desalination) deep purifying method; avoiding accumulation of salt effectively; reverse osmosis sloughing monovalent salt at last grade; trapping bivalent salt in innocent treatment system; proceeding depositing treatment continually; removing accumulating BOD and COD in water body through biochemical treatment effectively; realizing zero discharge of waste water.

The invention discloses a method and a device for treating garbage percolate, wherein the method comprises the steps of pretreatment, anaerobic treatment, membrane biochemical treatment, nanofiltration treatment, sludge treatment and the like; the device comprises a primary sedimentation tank (1) and an adjusting tank (2), the adjusting tank (2) is connected with an anaerobic reactor (3), the anaerobic reactor (3) is connected with a denitrification tank (4), and the denitrification tank (4) is communicated with a nitrification tank (5); and the nitrification tank (5) is connected with an ultrafiltration apparatus (6), and the ultrafiltration apparatus (6) is connected with a nanofiltration device (7). The method and the device achieve COD degradation of high-concentration wastewater so that the COD of high-concentration COD of 50,000 reaches about 50 after treatment and reaches the standard of industrial reuse water, thus the method and the device achieve zero discharge of the percolate, initiate a new attempt to treat high-concentration percolate, and fill up the domestic blank.

The invention provides bacillus methylotrophicus with preservation number-CCTCC NO. M2013500. The invention also provides a microorganism bacterium agent. The microorganism bacterium agent contains a culture medium and thallus, wherein the thallus comprise the bacillus methylotrophicus with preservation number-CCTCC NO. M2013500, bacillus subtilis, bacillus lincheniformis and bacillus amyloliquefaciens. The invention also provides an application of the bacillus methylotrophicus and the above microorganism bacterium agents to improvement of saline lands, improvement of plant drought tolerance, prevention of bacterial wilt of pepper and prevention of Citrus anthracnose.

The invention discloses a polysulfonamide nanofiltration or reverse-osmosis composite membrane, and a preparation method thereof. the preparation method for the polysulfonamide nanofiltration or reverse-osmosis composite membrane comprises the following steps: pretreatment of a porous supporting membrane; alternate layer-upon-layer assembling of a sulfonyl chloride organic-phase solution and a polyamine water-phase solution on the surface of the porous supporting membrane via reaction; heat treatment; etc.; wherein heat treatment can be carried out during or after layer-upon-layer assembling. Nanoparticles, a surfactant, a catalytic acid absorbent or catalyst, a pore forming agent and other additives are added into the sulfonyl chloride organic-phase solution and the polyamine water-phase solution. The polysulfonamide nanofiltration or reverse-osmosis composite membrane prepared by using the method has improved desalination performance and acid resistance, smoother surface and lower roughness compared with composite membranes prepared through traditional interfacial polymerization, and has good application prospects in the fields of nanofiltration and reverse osmosis.

The invention discloses a preparation method of a reverse osmosis composite membrane containing nano zeolite molecular sieves. The method comprises the following steps: dispersing the nano zeolite molecular sieves into polyamine aqueous solution to obtain a mixture A; dipping a polysulfone supporting membrane into the mixture A, taking out the membrane and then removing a solvent for the memebrane, carrying out interfacial polymerization on the membrane without the solvent in poly-acyl chloride solution, and after-treating the membrane after interfacial polymerization finishes to obtain the reverse osmosis composite membrane containing the nano zeolite molecular sieves; or dispersing the nano zeolite molecular sieves into the poly-acyl chloride solution to obtain a mixture B; and dipping the polysulfone supporting membrane into the polyamine aqueous solution, taking out the membrane and then removing the solvent for the membrane, carrying out interfacial polymerization on the membrane without the solvent in the mixture B, and after-treating the membrane after interfacial polymerization finishes to obtain the reverse osmosis composite membrane containing the nano zeolite molecular sieves. The reverse osmosis composite membrane containing the nano zeolite molecular sieves obtained by the preparation method of the invention has higher desalination rate, higher water flux and higher mechanical strength.

Methods of enhancing performance of a semi-permeable filtration membrane such as a polyamide R.O. membrane. A water soluble polymer is brought into contact with the membrane structure and is characterized by the Formula I

wherein E is a repeat unit remaining after polymerization of an ethylenically unsaturated monomer or mixtures thereof; R₁ is hydrogen or C₁-C₄ alkyl; R₂ is C₁-C₆ alkyl, C₁-C₆ alkylene, di-hydroxy substituted C₁-C₆ alkyl, di-hydroxy substituted C₁-C₆ alkylene, aryl, or mixtures thereof; n is 0 to about 100; R₃ is OH, SO₃Z OSO₃Z, PO₃Z₂, OPO₃Z₂, CO₂Z, or mixtures thereof; Z is hydrogen or a water-soluble cation; and the mole ratio c:d ranges from about 30:1 to 1:20 respectively.

The invention provides a preparation method of a compound reverse-osmosis membrane. The method includes the steps of sequentially coating a supporting layer of a substrate with a polyamine water solution, a vesica solution containing aquaporins, and a polyacyl chloride organic solution, and conducting post-treatment after interfacial polymerization reaction to obtain the compound reverse-osmosis membrane. The polymer porous supporting layer where polyamine is adsorbed is coated with the vesica solution containing aquaporins, and interfacial polymerization is conducted on the supporting layer and the polyacyl chloride organic solution to obtain the compound reverse-osmosis membrane. It is shown through experiment results that the prepared compound reverse-osmosis membrane has a desalinization ratio of 99.3% or above at the temperature of 25 DEG C, the pressure of 5 bar and the water flux of 15 LMH/bar(45GFD) or above under the testing condition of a water solution with 500 ppm of sodium chloride and pH of 6.5.

Disclosed are an amine aqueous solution for forming an active layer of a polyamide reverse osmosis composite membrane and a preparation method of the polyamide reverse osmosis composite membrane using the same. The amine aqueous solution comprises 0.1 to 20 wt % of a polyfunctional amine compound, 0.1 to 20 wt % of an alcohol amine compound, 0.1 to 20 wt % of a tertiary amine compound, and 40 to 99.7 wt % of water. Due to using an amine aqueous solution having an alcohol amine and a tertiary amine compound, the polyamide reverse osmosis composite membrane has high water permeability and enhanced salt rejection rate, and thus is useful for the membrane field.

The invention relates to a method for treating wastewater, and belongs to the field of wastewater treatment. The method comprises a first step of discharging the wastewater to a hardness-removing reaction tank, adding a hardness-removing agent to remove Mg<2+> and Ca<2+> from the wastewater; a second step of discharging the wastewater treated by the first step into a filter for filtration, and removing suspended solid substances; and a third step of discharging the wastewater treated by the second step into a vacuum membrane distillation device to directly perform vacuum membrane distillation, and separating other salts in the wastewater. With the method provided by the invention, the wastewater with high hardness and high salinity, particularly the alkali incineration wastewater produced in ethylene production, can be treated effectively. The method has the advantages of low wastewater discharging amount, high water yield, good water quality, etc.

The invention discloses a method for performing electrostatic desalting and dehydration on crude oil, which comprises the following steps: heating the crude oil to a temperature of between 115 and 155 DEG C; pouring water of which the weight is between 3 and 8 percent of the total weight of the crude oil to the crude oil; adding a demulsifier of which the weight between 0 and 25 micrograms per gram of the total weight of the crude oil to the mixture; mixing the materials in an active region with the ultrasonic frequency of between 20 and 40 kHz and the intensity of sound of between 0.5 w/cm<-2> and 0.75 w/cm<-2> for 1 to 5 minutes; keeping the mixture in a desalting and dehydrating tank in an electric field with the pulse electrical field strength of between 600 V/cm and 2,000 V/cm, the duty ratio of between 15 and 50 percent and the frequency of between 100 and 800 Hz for 25 to 50 minutes; and separating out sewage to obtain the purified crude oil which meets the requirement on salt content and is taken out of the device. The method can save more than 50 percent of electric energy.

The invention discloses a reverse osmosis membrane cleaning method, comprising the steps of cleaning the membrane by using alkaline cleaner, acidic cleaner, and sterilizing agent orderly, simultaneously, observing the decrease value of water yield under constant pressure and temperature, the increase value of net operation pressure at constant temperature and constant water yield, or the decrease value of water quality and desalinization ratio of modular system, to determine the occasion for cleaning reverse osmosis membrane. By using the method provided in the invention, the water yield and pressure difference of reverse osmosis membrane can be repaired to a great degree, the desalinization ratio after cleaning can be improved remarkably, and the removing ratios for TOC, CODMn, and UV254 can also be increased, thereby the method in the invention is simple, convenient, and efficient, and suitable for cleaning reverse osmosis membrane in water treatment process and other application field.

The invention discloses a graphene oxide modified PA (polyamide) composite nanofiltration membrane and a preparation method thereof. The method comprises steps as follows: preparing a PA ultrafiltration basement membrane; preparing an aqueous amino graphene oxide solution; adding a crosslinking agent to the prepared aqueous amino graphene oxide solution to prepare an amino graphene oxide crosslinking solution; dip-coating the PA ultrafiltration basement membrane with a layer of the amino graphene oxide crosslinking solution with a surface coating method firstly, then coating the PA ultrafiltration basement membrane with a layer of a PA ultrafiltration membrane casting solution to prepare the graphene oxide modified PA composite nanofiltration membrane. A large quantity of free carboxyl andhydroxyl exist on the membrane surface, so that the graphene oxide modified PA composite nanofiltration membrane has the characteristics of high hydrophilcity and high throughput; meanwhile, due to the crosslinking reaction between amino graphene oxide and a PA basement membrane, tightness can be improved; the membrane surface is negatively charged, so that desalinization rate can be effectivelyincreased, and throughput and desalinization effect of the nanofiltration membrane are improved; the technical scheme has large-scale industrial application and popularization prospect.

The invention belongs to the technical field of reverse osmosis composite membrane, and specifically refers to a high water flux reverse osmosis membrane and a preparation method thereof. An interfacial reaction of an aqueous solution of aromatic polyamine with polybasic acyl chloride solution is carried out on a porous support film, wherein the aqueous phase or organic phase solution for interfacial polymerization is supplemented with a polar aprotic additive; and certain subsequent treatment is carried out. The present invention has the advantage that the provided a preparation method is simple, and low in operating pressure; and the prepared polyamide reverse osmosis composite membrane has high water flux without significant reduction in the rate of desalination. The high water flux polyamide composite reverse osmosis membrane of the present invention has broad application prospects.

The invention relates to a membrane element, a device and a water processing method using the membrane element. The membrane element comprises a membrane, a water inlet end for allowing water to flow into the membrane, a waste water discharge end for discharging waste water from the membrane, a pure water end for discharging pure water from the membrane, a water inlet end electrode arranged in the inflow water, and a pure water end electrode arranged in the pure water, the pure water end electrode is connected with the cathode of a power supply, the water inlet end electrode is connected with the anode of the power supply, and the distance between the water inlet end electrode region and the water inlet end for allowing the water to flow into the membrane is larger than the distance between the water inlet end electrode region and the waste water discharge end for discharging the waste water from the membrane.

The invention provides a membrane distillation process using a hollow fiber membrane component to treat printing and dyeing wastewater, which comprises the following steps of: 1, pretreatment of the printing and dyeing wastewater; and 2, membrane distillation: making pretreated wastewater flow into a constant-temperature water heater, heating the wastewater to 50-60 DEG C via heat exchange of a low-quality heat source produced in the printing and dyeing process and the constant-temperature water heater, making the wastewater flow into a membrane distillation tank with the hollow fiber membrane component, and making cold water of 10-15 DEG C flow into a hollow fiber membrane of the hollow fiber membrane component from a constant-temperature cold water tank when the hollow fiber membrane component is soaked in the wastewater so as to form a temperature difference between inside and outside the hollow fiber membrane. Therefore, water vapor in the wastewater can move from the outer side to the inner side of the fiber membrane and can be condensed by cold water on the inner side of the fiber membrane to be discharged. The desalination rate of wastewater treatment can be improved greatly. Meanwhile, the pretreatment requirements can be reduced, the treatment can be simplified, energy can be saved, emissions can be reduced, and the operating and maintenance costs can be decreased.