286results about How to "Increase membrane flux" patented technology

The invention discloses an oil sludge cleaning and processing system for an oil tank. The oil sludge cleaning and processing system comprises a cleaning system, an oil sludge processing system and an integrated control system, wherein the cleaning system comprises a cleaning robot, an electric hydraulic pump, a water pump, an inert gas storage tank and a screw pump; the cleaning robot comprises a machine body, a traveling unit, a cleaning unit, a robot cleaning control unit, a sensing and communication unit and a robot power supply unit; the oil sludge processing system comprises an oil sludge processing device, an oil sludge processing control system and an oil sludge processing power supply device; the oil sludge processing device comprises a stirring machine, an ultrasonic emulsion breaking device, a centrifuge and an ultrafiltration system, as well as an oil sludge storage pool, a sludge pool, a centrifugal liquid storage tank, a concentration tank and a filtrate pool; a funnel is arranged on the stirring machine; and the integrated control system comprises an integrated control computer and a communication circuit module. The oil sludge cleaning and processing system disclosed by the invention has the advantages of reasonable design and high degree of intelligentization, and can realize comprehensive cleaning of the oil tank, good safety, fast oil sludge processing speed and resource utilization of oil sludge, and further reduce environmental pollution and waste of resources.

The invention provides a method for manufacturing a polytetrafluoroethylene hollow fiber membrane, comprising the following steps: step 1: using a PET fiber braided tube as a support tube, and coating the PET fiber braided tube with an adhesive; step 2: applying a PTFE flat The membrane is continuously wrapped on the PET fiber braided tube, and the adjacent PTFE flat membrane partially overlaps during wrapping; Step 3: Drying. By selecting high-quality PTFE flat membranes and precisely controlling the pore size of PTFE hollow fiber membranes, the porosity of PTFE hollow fiber membranes can be effectively increased, thereby improving the membrane flux of the fiber membranes, and the process is simple, easy to operate, and environmentally friendly. Pollution is small.

The invention relates to water deep treatment technology of heterogeneous catalytic ozonation depollution. With the combination of catalytic ozonation depollution technology with membrane filtration technology, a novel, high-efficient, and economical catalytic ozonation water deep treatment technology is provided, which combines the advantages of the two technologies, overcomes their disadvantages, effectively improves the ozone utilization rate and the ozone oxidation capability, reduces some toxic and harmful substances generated due to incomplete oxidation, alleviates the problem of ceramic membrane contamination, and prolongs the system operation period. An experiment device mainly comprises three parts: an ozone generation device, a ceramic membrane device, and a computer data acquisition and analysis system; an ozone outlet of the ozone generation device is connected with a water inlet valve of the ceramic membrane assembly through a silicone flexible pipe to realize the coupling of the two system. The method of the invention can improve the purifying effect of routine water treatment technology, and provides novel, high-efficient and cheap water deep treatment technology for enhanced removal of low-concentration high-toxicity refractory organic pollutants in water.

The present invention belongs to the field of membrane bioreactor, and is especially one mechanically cleaned membrane assembly. The membrane assembly includes membrane plate, water outlet branched pipe and aeration pipe. The membrane plate consists of membrane filament, membrane brush and water collecting pipe; the parallel membrane filaments and membrane brushes are arranged alternately; the membrane filament has its two ends connected to upper and lower water collecting pipes separately with the drained water being collected via membrane filament to two water collecting pipes; the water outlet branched pipe has one end connected to the water collecting pipe and the other end to the general water outlet pipe; the aeration pipe is connected to the branch and general aeration pipe; and gas is generated on two sides of the aeration pipe below the membrane plate and raises along the sides of the membrane plate. The membrane assembly is used in treating waste water with high flux.

The invention relates to a polyvinylidene fluoride membrane and a preparation method thereof, and specially, relates to a polyvinylidene fluoride organic-inorganic hybrid membrane and a preparation method thereof. A casting solution of the polyvinylidene fluoride organic-inorganic hybrid membrane comprises 14 to 25% of polyvinylidene fluoride, 3 to 12% of one or more mixed polymers, 0.2 to 5% of one or more inorganic nanometer additives, 4 to 12% of one or more hydrophilic pore-forming agents, 0.05 to 3% of a surfactant and 50 to 80% of one or two solvents. The casting solution is prepared and then is processed into a polyvinylidene fluoride organic-inorganic hybrid membrane finished product through a dry-wet spinning technology. Compared with the prior art, the preparation method adopts hydrophilic mixtures and hydrophilic inorganic nanometer particles simultaneously and thus further improving membrane wire hydrophily, membrane flux and membrane contamination resistance.

The invention relates to an immersed vacuum membrane distillation plant and a sewage treatment technology using the same. The immersed vacuum membrane distillation plant comprises a raw water storage tank, a gas dissolving pump, a raw water heating water tank, a membrane distillation hydrophobic membrane module, a condenser, a vacuum buffer tank, a vacuum pump, a water producing tank, a valve, a measuring instrument, and an automatic controller. The sewage treatment technology is characterized in that: raw water is subject to pH regulation, microfiltration and other pretreatment, then the pretreated raw water enters into the raw water storage tank, the sewage in the raw water storage tank is subject to gas-water mixing through the gas dissolving pump, and then the gas-water mixture enters into the raw water storage tank for heating to a specific temperature, membrane distillation is carried out at the specific temperature, the produced water after membrane distillation is directly reused, and a little thick water is treated concentrately. According to the invention, the use of the plant in sewage treatment reduces the effect of concentration polarization and temperature difference polarization in the sewage, reduces membrane pollution, increases the membrane distillation flux, prolongs the operation period of the membrane module, reduces the heat loss of the pipeline, and increases the heat utilization rate.

The invention discloses a preparation method of a high-flux PVDF porous membrane. The method comprises the following steps: mixing PVDF, a highly hydrophilic polymer, a pore-forming additive, deionized water, a solvent and graphene powder, curing, stirring, standing, defoaming so as to obtain membrane casting liquid, and forming a wet membrane from the membrane casting liquid in a scraping manner; pre-evaporating the wet membrane in air, putting the pre-evaporated membrane in a solidification bath, and soaking to obtain a primary membrane in the deionized water; putting the primary membrane in the deionized water, performing heating activation, soaking in absolute ethyl alcohol and n-butyl alcohol, and airing in the air. According to the method, graphene nano-particles with two-dimensional structures are used as additives, the pure water flux can be up to 800L*m<-2>*h<-1> or more, and the rejection rate on bovine serum albumin is 98% or more; the hydrophilic polymer is added for performing the activation on the primary membrane, so that the hydrophilia of the PVDF membrane is greatly improved, and the membrane surface contact angle is up to 59.8 degrees; a porous membrane material is adopted, so that the structure is controllable, and the pore diameter range is controlled to be within 0.1-5 microns.

The invention relates to a polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and a preparation method thereof. Membrane-casting liquid of the fiber membrane comprises the following components in percentage by weight: 14 to 25 percent of polyvinylidene fluoride, 1 to 12 percent of polyacrylonitrile, 4 to 15 percent of organic-inorganic compound additive and 50 to 80 percent of solvent. After the membrane-casting liquid is prepared, the finished polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane is prepared by a dry-wet spinning process. Compared with the prior art, the preparation method has the advantages that a hydrophilic blend and the novel organic-inorganic compound additive are added, so that the strength and the hydrophilcity of membrane fiber is further improved; and compared with a relatively pure polyvinylidene fluoride membrane, the prepared polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane has the advantages that the performance of is greatly improved, and the application field of the membrane is greatly widened.

The invention discloses a vacuum membrane distillation type sewage treatment device capable of recycling heat. The vacuum membrane distillation type sewage treatment device comprises a heating tank which is provided with a heater and used for heating sewage, wherein a sewage outlet of the heating tank is communicated with a sewage inlet of a membrane evaporator through a liquid circulating pump, and a sewage outlet of the membrane evaporator is communicated with a sewage backflow inlet of the heating tank; a refrigerant inlet and a refrigerant outlet of a heat pump condenser in the membrane evaporator are communicated with a refrigerant inlet and a refrigerant outlet of a heat pump evaporator through pipelines; and a steam inlet of the heat pump evaporator is communicated with a steam outlet of the membrane evaporator, a liquid water outlet of the heat pump evaporator is connected with a steam-water separator, and a gas outlet of the steam-water separator is connected with a circulating water vacuum pump, so that a vacuum system is formed. The vacuum membrane distillation type sewage treatment device is suitable for treating waste liquids containing heavy metal ions or purified seawater, has three functions of recycling water, concentrating waste liquid and saving energy and is characterized in that a refrigerant is used for recycling heat emitted by phase change of water steam, and the heat is used for heating sewage in the evaporator, so that the heat recycling effect is realized.

The invention relates to an improved preparation method of a polypropylene hollow fiber separation membrane. The invention belongs to the field of high-molecular material science. The method comprises the steps that: (1) polypropylene and a diluent are added into a kettle with a stirring device; heating and stirring are carried out, such that a membrane casting liquid is obtained; and when stirring is stopped, the liquid is subjected to standing and defoaming for 0.5-2h; (2) the membrane casting liquid is filtered by using a filter; an inner core liquid is introduced into a spinning nozzle, wherein a nozzle temperature is 145-165 DEG C; the inner core liquid and the membrane casting liquid are extruded by the spinning nozzle; the mixture first passes through air atmosphere, and then enters a multi-stage coagulating bath; the membrane casting liquid is cooled by the multi-stage coagulating bath, and the hollow fiber membrane is obtained by curing; (3) the hollow fiber membrane is wound by using a winding machine, and is extracted in one or a plurality of extraction agents; and (4) the extracted membrane is fetched and dried; and extraction agent is removed, such that the polypropylene hollow fiber separation membrane is obtained. With the method provided by the invention, under a same condition, a membrane flux is improved from 15/m<2>.h of one-stage water coagulating bath to higher than 1200/m<2>.h of two-stage coagulating bath.

An impurity removing and desalting method for 1, 3-propanediol zymotic fluid relates to a 1, 3-propanediol zymotic fluid, which provides the An impurity removing and desalting method for 1, 3-propanediol zymotic fluid. Micro filtering impurity removing is that the 1, 3-propanediol zymotic fluid with germ is preprocessed by a filtering bag and enters a ceramics film device micro for micro filtering impurity removing. The germ body and protein macromolecular matter are removed from zymotic fluid to get the zymotic filter fluid of the 1, 3-propanediol. The salt removing by electrodialysis is that zymotic filter fluid containing the 1, 3-propanediol is put into an electrodialysis device to remove salt and completes when filtrate conductance is reduced to 2000 us. Therefore, the electrodialysis operation is stopped. The filter fluid enters the following technics for condensation and purification. The invention has a bigger film flux, a good treating effect and light ion exchanging film pollution. The salt removing by electrodialysis has low energy consumption and good treating effect. The conductance of material liquid can be completely reduced to 2000 us to satisfy techincs demand of following concentration and distillation. The loss rate of the 1, 3-propanediol is low with little environment pollution.

The invention discloses a graphene oxide modified high-temperature ultrafiltration composite membrane and a preparation method thereof. The high-temperature ultrafiltration composite membrane is prepared through a chemical immersion method and a layer-by-layer assembling method by utilizing a graphene oxide modified commercial polyvinylidene fluoride ultrafiltration membrane. The preparation method comprises the following modification steps: activating the polyvinylidene fluoride ultrafiltration membrane; immersing in a trimesoyl chloride solution and grafting an acyl chloride group; immersing in a graphene oxide solution; and circularly and alternately immersing in an ethylenediamine solution and the graphene oxide solution to enable graphene oxide to be connected through an ethylenediamine cross-linking agent, and forming a lamellar structure on the surface of the membrane so as to obtain the graphene oxide composite membrane with different layer quantities. The graphene oxide modified high-temperature ultrafiltration composite membrane prepared by the preparation method has the advantages of high flux, high anti-pollution property and high pollutant removing rate; and the water flux can reach 3750kg/m<2>h to 10150kg/m<2>h and the removing rate of soluble organic matters is 36.5%-68% and is improved by 15% when being compared with that of an ultrafiltration membrane before modification.

A curtain-type hollow fiber membrane module is composed of membrane fibers, water collecting tube and aerating tubes. It features that the ultrafiltering or microfiltering hollow fiber membrane made of the membrane fibers with 1.5-3.5 m in length integrate the aeration flushing with sucking and collecting water for increasing the flux of membrane and decreasing the energy consumption for flushing.

The invention relates to a macromolecule separation microporous membrane and a preparation method thereof, in particular to a preparation method of modified fiber powder / polymer mixed microporous membrane. The method provided by the invention includes the following steps: the surface of the fiber powder is cleaned and carved; the surface-carved fiber powders, polymer, various additives and solutions are combined to prepare membrane casting liquid, and then the membrane casting liquid is put onto a glass plate for membrane-shaving or spanning and then the liquid membrane is gelatinized into membrane in the coagulation bath process, and finally the membrane is dipped in membrane-dipping liquid and then is dried. The invention can prepare the polymer microporous membrane which has low cost, high strength and better capability through adding various fiber powders into the membrane preparation liquid and changing process conditions.

The invention discloses a purification method for oilfield reinjection water. According to the method, at least one level of membrane filtration treatment is carried out on oilfield produced water through a cellular carrier type inorganic carbon membrane component so as to prepare the reinjection water suitable for low permeability and extra-low permeability oil reservoirs, wherein the filter precision of the membrane component for membrane filtration treatment is 0.001-100mu m. The purification method has high filtration accuracy, the membrane flux of the compound carbon membrane carrier is large, the capacity of the membrane in resisting oil contamination is strong, the integration level of the structure of the membrane core is high, the quality of the prepared reinjection water is stable, and fine filtrated oilfield reinjection water meets the requirement of the reinjection water for the oil reservoirs in low permeability and extra-low permeability block, and meets the A-grade standard of 'recommended index and analysis method for quality of oil reservoir injection water of clastic rock' (SY/T 5329-94).

The invention discloses an energy-saving high-salt wastewater treatment system and treatment method. The system comprises a forward-osmosis salt concentrating device and a multi-effect evaporator, wherein the forward-osmosis salt concentrating device comprises an FO membrane closed exchange box, an absorbing liquid recycling device and a fresh water recycling device; at least one stage of FO membrane closed exchange box is arranged; the absorbing liquid recycling device is respectively connected with each stage of FO membrane closed exchange box through electric valves; the fresh water recycling device is connected with the absorbing liquid recycling device; all stages of FO membrane closed exchange boxes are sequentially connected through liquid discharging electric valves and all connected with a multi-effect mother liquor evaporator through overrunning electric valves. According to hyperosmosis character of the high-salt wastewater and due to preparation of the absorbing liquid with higher colligative properties and utilization of osmotic pressure difference caused by difference of the colligative properties, the method can be used for efficiently concentrating the high-salt wastewater as well as recycling water resource to generate electric energy; automatic interlock control is realized during a running process, and the running mode can be regulated according to different water charging conditions.

The invention belongs to the technical field of membrane method water treatment and relates to a composite membrane for membrane distillation, which is formed by compounding a hydrophilic layer, a hydrophobic layer and a non-woven fabric supporting layer. The composite membrane is characterized in that a hydrophilic layer membrane casting solution system is DMAC (Dimethylacetamide)/TiO2/LiCl/PVP/H2O/PVDF (Polyvinylidene Fluoride), a hydrophobic layer membrane casting solution system is DMAC/LiCl/H2O/PVDF, and the non-woven fabric supporting layer is made of a polyester material. The preparation method comprises the following steps of: firstly, uniformly striking a hydrophobic layer membrane casting solution on a clean non-woven fabric, standing, carrying out coagulating bath and airing; and then, uniformly striking a hydrophilic layer membrane casting solution on the just made hydrophobic layer, standing, carrying out coagulating bath and airing to obtain the hydrophilic/hydrophobic composite membrane. The hydrophilic/hydrophobic composite membrane for membrane distillation, provided by the invention, has the characteristics of strong antipollution capability, large membrane flux and high mechanical strength, and can be widely applied to different forms of membrane distilled bitter-brackish water desalination, seawater desalination and high salinity wastewater treatment and recycling processes.

The invention discloses a reciprocating rotary type membrane bioreactor which comprises a sewage treatment pond, a membrane separation device, a sludge discharge device, an aeration device, a water inlet pipe and a water outlet pipe. The membrane separation device is arranged in the sewage treatment pond, and a power driving assembly which drives the membrane separation device to conduct reciprocating rotation movement is installed on the lower portion of the membrane separation device. Due to the fact that the membrane separation device conducts the reciprocating rotation movement under the action of the power driving assembly, the surface concentration polarization phenomenon of a membrane separation assembly is significantly reduced, the membrane flux is kept stable, the service life of the membrane assembly is prolonged, and the sewage treatment efficiency is improved. Meanwhile, rejuvenation of the membrane assembly is conducted by rotating the membrane assembly in a rapid and reciprocating mode, traditional cleaning processes of adding chemical drugs or water or gas or the like are not needed, operation is easy, and the consumption of energy resources is greatly reduced.