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 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 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.