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

The invention provides a treatment technology for degrading antibiotic wastewater by an electrochemistry and membrane filtration coupling system. The treatment technology utilizes the electrochemistryand membrane filtration coupling system to treat the antibiotic wastewater, and the coupling system comprises a nitrogen cylinder, a hydraulic control device and a reactor which are communicated in sequence; the reactor comprises a reaction chamber, a water inlet is arranged at the upper end of the reactor and is respectively communicated with the reaction chamber and hydraulic control device, anegative electrode material titanium net is horizontally fixed below the water inlet and in the reaction chamber, a positive electrode material conductive film is horizontally fixed at the bottom surface of the reaction chamber, and the bottom surface of the reaction chamber is provided with a water outlet; and the positive electrode material and the negative electrode material are connected withan external power supply through titanium wires. The antibiotic wastewater passes through the negative electrode material titanium net and the positive electrode material conductive film to undergo filtration and electrocatalytic degradation in order to obtain purified wastewater. The technology which combines electrochemistry and the membrane filtration technique makes filtration and degradationof antibiotics carried out at the same time, so membrane pollution is solved, and efficient treatment of antibiotic wastewater is realized.

Belonging to the field of environmental engineering, the invention relates to a preparation method of a supportless forward osmosis membrane. The method disclosed in the invention utilizes the high hydrophilicity and film-forming property of polyvinyl alcohol, brings the polyvinyl alcohol into crosslinking with graphene oxide with bactericidal property and flexibility, and adds m-phenylenediamine and trimesoyl chloride to reduce the salt reverse flux of the prepared forward osmosis membrane. The forward osmosis membrane prepared by the method provided in the invention has thickness less than 38 micrometers, and has the characteristics of no support, high hydrophilicity and pollution resistance, well solves the problems of internal concentration polarization and membrane fouling, thus opening up a new way for forward osmosis membrane preparation and being able to promote wider application of a forward osmosis membrane separation technology.

The invention relates to a method for comprehensively preventing and controlling electrodialytic membrane pollution for desalination of coal chemical brine waste. The method comprises the following steps: (1) pre-removing organic matters, microbes, colloid, particle suspending matters, Ca<2+>, Mg<2+> and other high valence ions by utilizing the coupling and synergizing effects of a physic-chemical method and a membrane technology; (2) improving the anti-pollution performance of equipment by adopting an electrodialyzer for coal chemical brine waste; (3) controlling the application potential, solution flowing speed, temperature, concentrate pH and reversal cycle to run the electrodialysis below the limited current density; (4) carrying out online washing on membrane pollution formed by electrodialysis of coal chemical saline waste. The method is used for preventing and controlling the electrodialytic membrane pollution in the aspects of pre-removing pollutants, using specific electrodialyzer, optimizing the operation process, online washing membrane pollution and the like, which is to prevent and control membrane pollution formed when coal chemical saline waste is treated by electrodialysis by utilizing the synergetic effect of different technologies.

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 belongs to the technical field of chemical separation materials, relates to oil-water separation membranes and in particular relates to a method for preparing a selective oil-water separation dynamic membrane and application of the method. The method disclosed by the invention comprises the following steps: adding zinc acetate into absolute ethyl alcohol, and heating and refluxing so as to prepare zinc sol; dipping a base membrane into the zinc sol, and performing high temperature annealing so as to obtain a porous basement membrane coated with zinc oxide seeds; carrying out a hydrothermal reaction between the basement membrane and a zinc acetate pH regulator solution, washing and drying so as to obtain a zinc oxide pre-coated porous separation membrane; and removing oxygen deficiency in a hydrogen atmosphere or obtaining the oxygen deficiency in an oxygen atmosphere by utilizing the surface related deficiency influence of the pre-coated zinc oxide, and respectively obtaining a super-hydrophobic surface and a super-hydrophilic surface, so that the problem that the oil-water separation membrane has poor wetting selectivity is solved. The wetted selective oil-water separation dynamic membrane prepared by the method disclosed by the invention can be applied to oil-water separation and can be repeatedly recycled. The method disclosed by the invention is simple in preparation process, does not cause secondary pollution or emission of toxic substances, and is energy-saving and applicable to industrialized production.

The invention discloses an adjustable double-stage-rotation purifying device. The device comprises a fixed frame, an adjusting device, 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, the outer circumferential wall of the rotating drum is sleeved with a first membrane piece, 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 through the mounting hole, the side wall of the filtering drum is connected with a liquid inlet pipe, a filtering plate is inserted in the filtering drum, multiple second filtering holes are formed in the filtering plate, and second membrane pieces are fixedly mounted on upper and lower surfaces of the filtering plate. The device can better solve the problems of concentration polarization of membrane surfaces and membrane pollution, the purifying effect of the device can be significantly improved, and the flow of the liquid flowing out of the liquid outlet can be adjusted according to actual operation conditions.

The invention discloses an improved double-stage rotary purification device. The device comprises a fixing frame, a pushing device, a casing, a rotary barrel, a filter drum and a first motor, wherein a plurality of first filter holes are formed in the circumferential wall of the rotary barrel, the circumferential wall of the rotary barrel is sleeved with a first membrane component, a liquid outlet is formed in the bottom of the casing, the right end of the rotary barrel is detachably connected with an end cover, 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 side wall of the left end of the rotary barrel, the filter drum is communicated with the rotary barrel through the mounting hole, a liquid inlet pipe is connected to the side wall of the filter drum, a filter plate is inserted into the filter drum, a plurality of second filter holes are formed in the filter plate, second membrane components are fixedly mounted on the upper surface and the lower surface of the filter plate, and a positioning groove allowing the head end of the filter plate to be inserted is formed in the inner side wall of the filter drum. The problems of concentration polarization of a membrane surface and membrane pollution can be better solved, and the purification effect of the device is remarkably improved.

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 discloses a carbon dioxide assisted bipolar membrane electrodialysis system and a production method for amino acid production. The carbon dioxide assisted bipolar membrane electrodialysis system is characterized by consisting of a bipolar membrane electrodialysis device and a carbon dioxide assisting device, wherein repetitive units of ''alkali chambers-material liquid chambers-acid chambers'' are formed inside the bipolar membrane electrodialysis device; corresponding storage tanks are additionally arranged inside the bipolar membrane electrodialysis device; and the carbon dioxide assisting device is used for introducing a gas containing carbon dioxide into a material liquid storage tank, so that amino acid salt and CO2 can be converted into corresponding neutral amino acid through an adsorption equilibrium reaction. As amino acid is separated and produced by using the carbon dioxide assisted bipolar membrane electrodialysis system, the recycling efficiency of the amino acid in the electrodialysis process can be improved without introduction of extra acid, and in addition, membrane pollution can be reduced, and the operation cost can be lowered.

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 relates to a method for extracting a soybean whey oligosaccharide from soybean whey. The method concretely includes the steps that heating, flocculating, air floating and intermittent flow-crossing ultra-filtering are coupled; a segmented treatment mode is adopted in a ground-breaking mode at a pretreatment stage, and ingeniously combined with air floating separation; composite flocculants with specific components and a specific proportion are selected. The high-quality soybean oligosaccharide product low in maillard browning reaction occurrence rate is provided, the extraction ratio of the soybean whey oligosaccharide can reach 85% and is much higher than that at a common level in the field, the effect that all steps and parameters supplement each other and act in a coordinated mode is achieved, the cost is lowered, and the method is high in operability.

The invention discloses a rotary membrane sewage filtration device, which comprises a frame, a filter box, a first rotating shaft, a motor, and a filter cartridge. The filter box is installed on the frame, the first rotating shaft is rotatably installed in the filter box, the motor is used for driving the first rotating shaft to work, the filter cartridge is rotatably sheathed on the first rotating shaft, a plurality of filter holes are formed on the circumferential wall of the filter cartridge, a membrane member is fixedly sleeved on the external circumferential wall of the filter cartridge, the left end side wall of the filter cartridge is connected to a liquid inlet box, 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 hole, a second rotating shaft in transmission connection with the first rotating shaft is mounted on the filter box and is equipped with a gear able to rotate synchronously with it, and meshing teeth engaged with the gear is formed on the right side of the filter cartridge. The rotary membrane sewage filtration device provided by the invention well solves the membrane surface concentration polarization and membrane pollution problems, significantly increases the membrane permeation flux, and greatly improves the separation performance of the membrane.