30results about How to "Solve the problem of membrane fouling" patented technology

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 an MBR and MMBR composite sewage treatment system based on panel ceramic membranes. The composite sewage treatment system comprises a raw water facility, a raw water pump, bioreactors, a suction pump and a clean water pond, wherein each bioreactor comprises a reactor body, an aerating device and a sludge discharging system, and panel ceramic membranes and MBBR suspended fillers are organically combined in the same bioreactor and share the aerating device and the sludge discharging system; and an input end of the raw water pump is communicated with the raw water facility, an output end of the raw water pump is communicated with the internal space of the reactor body, an input end of the suction pump is communicated with outlets of the panel ceramic membranes, and an output end of the suction pump is communicated with the clean water pond. By combining the advantages of an MBR and an MBBR, a relatively good sewage treatment effect, particularly to high-COD and unmanageable industrial wastewater can achieved, and furthermore, the occupied area of a sewage plant can be reduced.

The invention discloses an improved rotating membrane sewage filtration device, which comprises a rack, a filter box, a first rotating shaft, a motor and a filter cartridge. A plurality of filter holes are formed on the circumferential wall of the filter cartridge, the outer circumferential wall of the filter cartridge is fixedly sleeved with a membrane member, the left side wall of the filter cartridge is connected to a liquid inlet tank, the bottom side wall of the filter box is provided with a liquid outlet, the right end side wall of the filter cartridge is provided with a slag outlet, a second rotating shaft in transmission connection with the first rotating shaft is mounted on the filter box, the second rotating shaft is equipped with a gear able to rotate synchronously therewith, and engaging teeth engaged with the gear are formed on the right side of the filter cartridge. The right end of the slag outlet is connected to a convergent cylinder, a rubber sleeve is inserted in the convergent cylinder, the right end of the rubber sleeve is connected to a plurality of petals, and each petal is equipped with an adjustment unit. The improved rotating membrane sewage filtration device provided by the invention well solves the concentration polarization and membrane pollution problems of the membrane surface, significantly increases the membrane permeation flux, and greatly improves the membrane separation performance.

The invention discloses a method for cleaning membrane pollution in the process of electrodialysis treatment on paper-making reconstituted tobacco extract liquor, which is used for cleaning an electrodialysis system generating membrane pollution through the cleaning processes of primary water washing, reversed-pole alkaline washing, secondary water washing, reversed-pole acid washing and tertiarywater washing in sequence. According to the cleaning method, membrane pollution in the electrodialysis process can be effectively solved, the desalination rate of an electrodialysis system is remarkably recovered, and reliable operation guarantee is provided for the process of treating the paper-making process reconstituted tobacco extracting solution through electrodialysis.

The invention discloses a two-stage rotating purification device. The two-stage rotating purification device comprises a fixing frame, a casing, a rotating drum, a filtering drum and a first motor, wherein multiple first filtering holes are formed in the circumferential wall of the rotating drum, a first membrane piece is mounted on the outer circumferential wall of the rotating drum in a sleeve manner, a liquid outlet is formed in the bottom of the casing, an end cover is detachably connected with the right end of the rotating drum, a first rotating shaft is fixedly connected onto the end cover and connected with an output shaft of the first motor, a mounting hole is formed in the left end side wall of the rotating drum, the filtering drum is communicated with the rotating drum via the mounting hole, the side wall of the filtering drum is connected with a liquid inlet pipe, a filtering plate is inserted and mounted in the filtering drum, multiple second filtering holes are formed in the filtering plate, second membrane pieces are fixedly mounted on the upper surface and the lower surface of the filtering plate, and a positioning groove where the head end of the filtering plate is inserted and mounted is formed in the inner side wall of the filtering drum. With the adoption of the two-stage rotating purification device, problems of concentration polarization of membrane surfaces and membrane pollution can be well solved, and the purification effect of the device is significantly improved.

The invention relates to an effective method for simultaneously improving the recovery rate of whey protein or protein in MPC, improving the membrane flux and reducing the lactose retention rate through complex enzyme polymerization coupling ultrafiltration. Concretely, laccase and transglutaminase are sequentially added; complex enzyme polymerization and ultrafiltration are effectively combined; a two-section type pretreatment mode is creatively used before complex enzyme polymerization; the mode that the enzyme is not deactivated after the laccase action is also combined, so that the purity and the recovery rate of the whey protein or the protein in the MPC is greatly improved; the membrane flux is improved; the lactose retention rate is reduced. Compared with the prior art, the method has the advantages that the recovery rate of the whey protein or the protein in the MPC is improved by 20 percent; the membrane flux is improved by 30 percent to 40 percent; the lactose retention rate is reduced by 10 percent; the method capable of simultaneously solving a plurality of problems is obtained. The invention also provides a high-quality product of the whey protein or the protein in the MPC; the condition that the product sensitization is obviously reduced is accidentally found; the effect is realized through the result of the complementary and synergic action of all work procedures and parameters; the operability of the method is high; only once filtering is performed; the industrialization is facilitated.

The invention discloses a non-ferrous metal raffinate pretreatment method before membrane pretreatment, and belongs to the technical field of industrial wastewater treatment. The operation steps of the method comprise: 1, degreasing wastewater, and adjusting the pH value; 2, carrying out static adsorption by using ultrafine powdery active carbon, and carrying out solid-liquid separation after achieving a saturated adsorption state; 3, carrying out dynamic adsorption on the ultrafine powdery active carbon adsorption effluent by using granular active carbon; and 4, carrying out deep treatment onthe wastewater by using cellulose acetate filaments, and carrying out deep treatment on the adsorption effluent by using a membrane. According to the present invention, through the selective adsorption of the specific molecular weight organic matter based on the particle size difference in active carbon, and the selective filtration separation property of the cellulose acetate polymer, the selective adsorption separation of the target pollutant is achieved, such that the pollution on the membrane in the subsequent membrane treatment by the target pollutant can be avoided, and the new chemicalis not introduced and the physicochemical properties of the raffinate are not changed so as to provide the technical support for the membrane treatment and reuse of the raffinate.

The invention belongs to the technical field of preparation of environmental functional materials, and discloses a method for preparing a CoFe-PBA@PVDF composite membrane by combining coordination self-assembly with delayed phase change and application of the CoFe-PBA@PVDF composite membrane. The PVDF composite membrane with efficient oil-water emulsion separation and anti-fouling properties is prepared by regulating and controlling the surface distribution of inorganic nanoparticles on the membrane and the pore size of the membrane. The obtained PVDF composite membrane has super-hydrophilicity, underwater super-oleophobicity, good water/oil separation performance, anti-fouling performance and self-cleaning function. The separation efficiency for oil-in-water emulsion corresponding to dichloroethane, petroleum ether, methylbenzene, soybean oil and normal hexane reaches up to 99.8%. The in-situ growth of PBA on the surface of the membrane can greatly reduce the blockage of the emulsion to pores and channels on the surface of the membrane by virtue of an advanced oxidation method of persulfate PMS. Due to the excellent catalytic performance of PBA, the composite membrane can effectively degrade organic dye. In an experiment of cross flow for 1 hour, the removal rate of MB is kept to be 99% or above.

The invention discloses a coupling anaerobic digestion and DAMO biological filter column and a method for treating carbon-nitrogen sewage, and the method comprises the steps of anaerobic digestion methane production bottom end starting, DAMO upper end starting, coupling with anaerobic digestion methane production and organic load and nitrogen load increasing stages, by adopting a step-by-step starting method, firstly, anaerobic methanogens are enriched at the lower part of a reactor; dAMO microorganisms are enriched on the upper middle portion of the reactor, methane and nitrite nitrogen/nitrate nitrogen are generated and subjected to a DAMO reaction on the upper middle portion of the reactor, the nitrite nitrogen/nitrate nitrogen is converted into nitrogen, and anaerobic removal of carbon and nitrogen in the sewage with medium and low carbon and nitrogen can be achieved while efficient autotrophic nitrogen and carbon removal of the sewage are completed. According to the method, greenhouse gas emission in the sewage treatment process is reduced, the problem that nitrate in total nitrogen in effluent is too high is solved, and low-consumption nitrogen and carbon removal of medium-and-low-concentration carbon-nitrogen sewage is realized.

The invention belongs to the technical field of membrane distillation, and particularly relates to a disc tube type vacuum multi-effect membrane distillation assembly and system. A disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type component, and a membrane on a disc type membrane in the disc tube type component is a pervaporation membrane or a distillation membrane. The disc tube type component comprises a shell, an upper flange plate and a lower flange plate are arranged at the two ends of the shell respectively, the upper flange plate and the lower flange plate are fixed through a center pull rod, and a flow guide plate and a disc type membrane are arranged in the shell. A to-be-treated material inlet, a concentrate outlet and a purified water outlet are formed in the upper flange plate or the lower flange plate. According to the invention, the disc tube type reverse osmosis assembly and the membrane distillation technology are coupled to construct the novel membrane distillation assembly, so that the problems of low membrane distillation flux and membrane pollution in the prior art are solved; a vacuum membrane distillation form is adopted, so that certain flux can be improved, and pollution of high-salinity wastewater to a membrane distillation membrane is relieved.

The invention discloses a ferrous/ultraviolet synergistically activated sodium hypochlorite coupled ultrafiltration water purification device and an operation method thereof, and relates to a ferrous/ultraviolet synergistically activated sodium hypochlorite coupled ultrafiltration water purification device and an operation method thereof. The invention aims to solve the problem of poor membrane pollution treatment effect caused by algae extracellular polymeric substances while micromolecules are removed by membrane pretreatment in the existing water treatment process. The device comprises a water inlet pipe, a sodium hypochlorite adding tank, a ferrous iron adding tank, a photochemical reaction area, a membrane filtration water purification area, a water outlet pipe and a backwashing pipe,the water inlet pipe is connected with a water inlet of the photochemical reaction area through a water inlet pump, and a water outlet of the photochemical reaction area is connected with a water inlet of the membrane filtration water purification area through a photochemical reaction area water outlet pump; a water outlet of the membrane filtration water purification area is respectively connected with the water outlet pipe and the backwashing pipe through a tee joint. According to the invention, the activation characteristic of ferrous ions and ultraviolet light on sodium hypochlorite is utilized to realize efficient removal of pollutants and improvement of membrane separation efficiency. The device and method is applied to the technical field of membrane water treatment.