111 results about "Membrane flux" patented technology

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention discloses a self-adaptive adjustment magnetic separation-membrane filtration coupling sewage treatment system and a self-adaptive adjustment magnetic separation-membrane filtration coupling sewage treatment method. The system comprises a pretreatment unit, a magnetic separation core unit, a self-adaptive intermediate buffer unit, a membrane filtration unit and a sludge treatment unit which are communicated in sequence. The core of the system is that a plurality of on-line sensors are linked through a central control system, water quality parameters are monitored in real time, the adding amount of magnetic powder and a coagulant, the rotating speed of a stirrer, the membrane flux, the backwashing period and a cleaning program are adjusted in a self-adaptive mode, and intelligent cooperation and accurate regulation and control of magnetic separation and membrane filtration processes are achieved. According to the invention, the problems of easy membrane pollution, high magnetic powder consumption, high operation cost and dependence on manual operation in the traditional process are effectively solved, the service life of the membrane is obviously prolonged, the operation and maintenance cost is reduced, and the effluent quality is stable and meets the high-standard discharge or reuse requirement.

The invention relates to the field of direct drinking water of a fusion calculation model, and discloses a double-membrane mixing direct drinking water system and an operation method.The method comprises the steps that online data of a water supply end and a water quality monitoring end are collected for cleaning and time alignment, and a basic working condition data set is formed; the method comprises the following steps: establishing an operation characteristic model comprising water demand prediction, raw water quality prediction and membrane flux characteristic sub-models, calculating double-membrane target water yield and water quality indexes based on the model to generate a control parameter set, evaluating membrane pollution to generate an online cleaning task queue, performing joint simulation to generate a pressure stability control instruction set, and dynamically correcting the model. The conversion from passive response to active pre-judgment of the double-membrane mixing direct drinking water system is realized, and the operation stability, the water quality guarantee capability and the water-saving and energy-saving effects are improved.

The invention relates to the field of sewage treatment, in particular to an urban sewage treatment system based on the Internet of Things. Comprising a grating tank, a desilting tank, an anoxic tank, an anaerobic tank, an aerobic tank, a sludge concentration tank and a disinfection tank which are sequentially connected, a membrane filtration unit and an aeration unit are arranged in the aerobic tank, the membrane filtration unit comprises a plurality of membrane assemblies which are distributed at equal intervals in the length direction of the aerobic tank, and each membrane assembly is provided with a flow sensor. A membrane treatment mechanism corresponding to each membrane component is arranged in the aerobic tank, each membrane treatment mechanism comprises a rotating frame and a sliding frame, and when the sliding frames slide along the sliding chutes from top to bottom, membrane surfaces with different heights are sequentially close to the aeration units to form a gradient flushing mode. The membrane flux condition of the membrane module is known through monitoring of the Internet of Things, the membrane treatment mechanism can be started in time, the membrane module slides down obliquely along with the sliding frame, the membrane surface is scoured section by section in combination with aeration, flux stability is effectively maintained, and stable operation of the sewage treatment system is ensured.

The invention discloses a membrane separation and concentration system for treating solid waste incineration fly ash, relates to the technical field of membrane separation, and aims to solve the technical problem that a concentrated solution is difficult to form a high-concentration state due to reduction of membrane flux caused by thickening of a filter cake layer. An annular filter membrane is installed on the rotating frame, a concentration chamber is formed in an inner cavity of the annular filter membrane, a supporting pipe body is arranged in the concentration chamber, a liquid inlet channel is arranged in an inner cavity of the supporting pipe body, and a plurality of gathering plates and collecting assemblies are further arranged in the concentration chamber. The device has the advantages that a stable filter cake layer formed on the surface of the membrane during static filtration is broken, membrane hole blockage caused by continuous deposition of impurities is avoided, a concentrated solution can be in full contact with a new filter hole area, which does not participate in preliminary filtration, of the annular filter membrane, the filter area of the filter membrane is utilized to the maximum extent, and the filter efficiency and the concentration multiple are improved.

The invention relates to the technical field of water purification treatment, and discloses an intelligent water purification system and method based on membrane feature recognition and pulse cleaning, and the method comprises the following steps: collecting discrete hydraulics monitoring data to construct a space-time synchronization hydraulic state tensor, and extracting pressure component mapping to generate a membrane resistance evolution topology curved surface and a resistance gradient vector; after a dominant pollution mechanism is matched and identified by using a pollution morphological feature library and a fluid pulse modulation parameter set is generated, an advanced energy storage potential energy target is calculated based on pipe network load prediction, and then an energy storage saturation state is established; driving the target membrane module to execute a multi-stage composite physical regeneration process including first forward flushing, reverse deep cleaning and second forward flushing, and implementing pressure dynamic compensation based on an advanced energy storage target; according to the invention, the pressure fluctuation caused by regeneration switching is eliminated by utilizing active potential energy release while deep regeneration of the membrane module is realized through an original three-section cleaning process, so that the water supply continuity and the membrane flux recovery rate are remarkably improved.

The invention discloses an ultrafiltration membrane water treatment control method. The method comprises the following steps: collecting inlet water quality parameters and membrane module operation parameters in real time; dynamically predicting a membrane pollution trend by using an online trained machine learning model based on the acquired parameters, and adaptively adjusting a transmembrane pressure difference control threshold according to a prediction result and historical operation data; executing membrane filtration operation according to the adjusted transmembrane pressure difference control threshold value, and monitoring a membrane flux change rate and an energy consumption change rate in real time; triggering a multi-stage backwashing program based on the membrane flux change rate, and synchronously optimizing the pressure, period and interval of backwashing in combination with the prediction model; and after backwashing is completed, membrane integrity detection is executed. According to the method, the machine learning model fusing the support vector machine and the long-short-term memory network is constructed, the membrane flux change rate is dynamically predicted in combination with real-time monitoring data, the trans-membrane pressure difference control threshold value and the backwashing strategy are intelligently adjusted accordingly, and collaborative optimization of the system operation efficiency and the membrane service life is achieved.

The application relates to the technical field of nanofiltration membrane processing, in particular to a modification and recycling method of waste nanofiltration membranes, which comprises the following steps: 1) cyclic normal-temperature cleaning of the nanofiltration membranes by using alkaline agents or acid agents in combination with ultrasonic waves, and the cleaned nanofiltration membranes are washed clean by using deionized water or distilled water; 2) oxidation modification treatment in an oxidation reaction device by using an ozone oxidation method; 3) oxidation modification by using an oxidation agent in a modification device; 4) oxidation modification by using an acid medium oxidizing agent in the modification device; 5) hydroxylation modification by using a hydroxylation agent in the modification device; 6) modification and stabilization treatment by using a buffer stabilizing agent, and washing clean, so as to complete the modification and recycling treatment of the waste nanofiltration membranes. According to the modification and recycling method, the waste nanofiltration membranes can be utilized, the modification process is relatively simple, the membrane surface is not damaged after modification, the nanofiltration membrane flux is significantly improved after modification, and the interception rate meets the design and use requirements.

The application discloses a kind of high selectivity nanofiltration composite membrane and preparation method thereof, belong to nanofiltration membrane related technical field.The application is in the form of in-situ polymerization with anhydride, ester group, amide group on membrane surface, the degree of hydrolysis of polyamide membrane is controlled by the cleaning of post-processing solution, to control the charge density of membrane surface, to improve or reduce the permeability of monovalent ion;By controlling the ratio of trimesoyl chloride and diacyl chloride monomer, the size of pore structure can be adjusted, further improving the permeability of monovalent salt;By adjusting the amount of hydrophilic pore-forming agent to improve the hydrophilic performance of ultrafiltration base film, the flux and monovalent salt permeability of nanofiltration composite membrane are improved.The high selectivity nanofiltration composite membrane prepared by the application has excellent divalent salt ion removal rate, lower monovalent salt removal rate, and higher water flux, suitable for industrial production.

The invention belongs to the field of caprolactam aqueous solutions, particularly relates to a low-concentration caprolactam aqueous solution recovery system and method based on multistage membrane separation, and provides the following scheme aiming at the problems that the existing caprolactam aqueous solution contains a certain amount of particle suspended solids, and the suspended solids are easy to block membrane holes, so that the membrane flux is reduced and the service life is shortened. Comprising a main machine frame, an auxiliary machine frame is fixedly installed at the top of the main machine frame, two sets of high-pressure pumps are fixedly installed on one side of the auxiliary machine frame, a filter box is fixedly installed at the top of the auxiliary machine frame, and the bottom of the filter box communicates with liquid inlets of the two high-pressure pumps. A caprolactam solution is preliminarily filtered through multiple layers of filter plates in the filter box, particulate suspended solids are effectively removed, the quality of the solution entering a subsequent treatment link is guaranteed, a round rod and a rotating shaft are driven to rotate through an operation block, then the inclination direction of an adjusting plate is changed, and flexible communication between a liquid outlet position and different high-pressure pumps is achieved.

The application provides a phosphogypsum residue field water treatment process based on a membrane coupling chemical reactor, relates to the technical field of wastewater resource treatment, and can selectively perform gradient precipitation on fluorine, phosphorus, nitrogen and sulfur, cooperates with a membrane filter for targeted design, realizes a membrane separation process resistant to high-concentration suspended solids, and can make the membrane flux attenuation rate less than 5% / day. The application can effectively separate fluorine, phosphorus and nitrogen from water to form mud with resource value, the value of the resource product per ton of water treatment is higher than the treatment cost, 80% of the recovered water meets the industrial recycling standard, and the phosphogypsum residue field water can be advantageously used for quasi-zero emission and deep high-value resource utilization.

The invention relates to the technical field of hemodialysis, in particular to a preparation method and system for a low-endotoxin hemodialysis concentrated solution, and the method comprises the steps: obtaining a preparation data set, extracting a temperature sequence, a pH value sequence and an endotoxin content index value, and calculating a membrane flux distribution sequence and an adsorbent activity distribution sequence. Performing primary dialysis path optimization to generate a first completely optimized network; identifying a target path node pair according to the target endotoxin content value, and performing secondary path extension to generate a second completely optimized network; and finally identifying a temperature and pH value regulation and control sequence corresponding to the target path node to complete preparation. By optimizing the network, the test workload is remarkably reduced, the endotoxin removal efficiency and the process parameter control precision are improved, and the problems that in the prior art, the endotoxin removal efficiency is low, and the product batch stability is poor are solved.

The invention relates to the technical field of sewage treatment, and particularly discloses a sewage treatment control method based on AI intelligent driving, and the method comprises the following steps: S1, collecting parameters in real time; s2, inputting the parameters into a pre-trained random forest model to obtain an output aeration rate set value, a sludge reflux ratio and a carbon source feeding rate; s3, adjusting the rotating speed of an aeration fan of the aerobic tank according to an aeration rate set value, adjusting the frequency of a sludge reflux pump according to a sludge reflux ratio, and adjusting a metering pump to add a sodium acetate solution according to a carbon source adding rate; and S4, when the turbidity of the MBR membrane pool exceeds a turbidity threshold value, giving out an early warning, further judging whether the transmembrane pressure difference of the MBR membrane pool exceeds a transmembrane pressure difference threshold value or whether the membrane flux attenuation exceeds a membrane flux attenuation threshold value, and if so, starting a pulse backwashing program.

The present invention is an improved system and method of crossflow microfiltration and ultrafiltration with a membrane that is subject to fouling during the filtration process. The system includes a permeate removal conduit for transferring permeate. The permeate removal conduit includes a flexible orifice arranged by flexing and contracting to regulate permeate flow through each membrane module and thereby regulating membrane flux through each membrane in the system. The system also includes a backpulse check valve to enhance delivery of backpulse and membrane cleaning fluids.

This invention discloses a layer-by-layer deposition modified ultrafiltration membrane with both antifouling and antibacterial properties, its preparation method, and its applications. Through layer-by-layer assembly technology, a tannic acid (TA) anion layer and a polyhexamethylene biguanide (PHMB) cation layer are alternately deposited on the surface of an ultrafiltration membrane. Under weakly alkaline conditions, electrostatic interactions, hydrogen bonding, Schiff base reactions, and Michael addition reactions are simultaneously utilized to achieve both non-covalent and covalent bonding, constructing a stable and dense integrated antibacterial-antifouling composite coating. This coating has a contact-type antibacterial structure, which can effectively kill bacteria in water and inhibit biofilm formation at the source. Simultaneously, it significantly improves the hydrophilicity of the membrane surface, reduces pollutant adsorption and deposition, and achieves synergistic enhancement of antibacterial and antifouling properties. The preparation process of this invention is mild, simple, low-cost, and environmentally friendly. The modified membrane exhibits high flux retention, excellent separation performance, and excellent operational stability, and can be widely applied in water treatment scenarios such as municipal wastewater treatment.

The application is a kind of intelligent regulation and control ceramic membrane microalgae recovery system and method.The application relates to the technical field of microalgae recovery, the application inoculates target microalgae varieties in a microalgae culture pond, and sets appropriate temperature, light intensity, nutrient substance addition amount initial culture conditions according to the growth characteristics of microalgae; each parameter in the microalgae culture pond is monitored in real time through an intelligent monitoring module; according to the monitoring data, a ceramic membrane filtration unit is controlled through a feedback control unit, the filtration performance of the culture solution is improved, and the stability of the membrane flux is maintained. Compared with the traditional ceramic membrane recovery method, the microalgae recovery efficiency is improved by more than 30%, the membrane pollution degree is reduced by more than 40%, the economic benefit and environmental benefit of microalgae recovery are greatly improved, and a solid foundation is laid for the large-scale industrialized development and utilization of microalgae resources.

The invention relates to a membrane anti-pollution method and a membrane anti-pollution system based on a magnetic sharp needle array electrode and application, and the membrane anti-pollution method comprises the following steps: dispersing a granular material with magnetic conductivity and electrical conductivity on the surface of a membrane or an adjacent area of the outer side of the membrane, and under the action of a parallel gradient magnetic field, self-assembling the granular material to form a sharp needle array vertical to the surface of the membrane; and the sharp needle array is used as a cathode, and an electric field is applied outside the film body, so that an enhanced local electric field is generated at the needle point. By means of the point effect of the needle-shaped structure and the electrostatic repulsion effect of an electric field, negatively charged pollutants repel before approaching the surface of the membrane, so that the negatively charged pollutants in a water body can be effectively prevented from migrating to the surface of the membrane and entering membrane holes; therefore, the purposes of relieving membrane pollution, delaying membrane flux attenuation and improving the operation stability of the membrane separation process are achieved. The device is simple in structure, high in controllability and suitable for anti-pollution application in various membrane separation processes.

The application discloses a method for preparing seawater extract and a food supplement, and relates to the technical field of seawater desalination and concentration. The first nanofiltration treatment makes calcium, magnesium and sodium ions in filtrate one be redistributed in the first desalination liquid and the first concentration liquid, so that the concentration of calcium and magnesium ions in the first desalination liquid is relatively low. Reverse osmosis treatment is performed on the first desalination liquid, which reduces the membrane flux reduction trend of the reverse osmosis membrane, so that the reverse osmosis membrane maintains a relatively high membrane flux recovery rate, thereby effectively reducing the fouling trend of the reverse osmosis membrane and the nanofiltration membrane. Compared with the filtrate one, the first nanofiltration treatment also preliminarily reduces the concentration ratio of sodium ions and main ions in the first concentration liquid. After the first concentration liquid and the second desalination liquid are mixed and then subjected to Dia nanofiltration treatment, the first concentration liquid is diluted, so that the calcium, magnesium and sodium ions in the first concentration liquid are redistributed in the nanofiltration process. Compared with the first concentration liquid, the concentration ratio of calcium and magnesium ions and main ions in the third concentration liquid is increased, and the concentration ratio of sodium ions and main ions is reduced.

The utility model provides a membrane filtering device and relates to the technical field of pharmacy. The membrane filtration device comprises a stock solution tank, a clarification pipeline, a flow supply pipeline, a backflow pipeline and at least two membrane pipe assemblies which are connected in parallel. It needs to be explained that the total filtering area is remarkably increased through the at least two membrane tube assemblies, and the membrane flux is improved. And any two membrane tube assemblies are independent from each other based on the parallel arrangement of the membrane tube assemblies. Therefore, when the production demand changes, the membrane tube assemblies with the corresponding number can be started or stopped to quickly adapt to different filtering capacity requirements, and the flexibility of the device is enhanced. Besides, the flow supply pipeline is provided with a pre-filtering assembly for filtering particle impurities in series, so that large particle impurities can be removed in advance, the membrane tube assembly is protected from being blocked or damaged, the membrane flux is ensured, and the stability and efficiency of the clarification and concentration process are improved.

The application discloses a method for preparing an antibacterial nanofiltration membrane by using amikacin as a water-phase monomer, and belongs to the technical field of composite nanofiltration membrane preparation. The method uses amikacin as a water-phase monomer and adopts an interfacial polymerization method to prepare an antibacterial nanofiltration membrane (polyamide nanofiltration membrane). The method has the advantages of simple operation, mild reaction conditions and relatively low raw material cost. In addition, the prepared polyamide composite nanofiltration membrane has higher selective permeation performance and good antibacterial performance. The nanofiltration membrane flux can be as high as 20 L / (m 2 ·h·bar), and the tetracycline rejection rate can be as high as 99.3%. In addition, the application can also provide a reference for the preparation of other antibacterial interfacial polymerization separation membranes.

The utility model provides a membrane flux test experimental device, and belongs to the technical field of membrane flux detection. The membrane flux test experimental device comprises a support structure and a test structure. The supporting structure comprises a supporting plate, and a sewage tank, a first supporting frame and a second supporting frame are mounted on the surface of the supporting plate; the testing structure comprises a membrane mounting frame, two membrane assemblies, a power cabinet, a water collecting tank and a driving part, the membrane mounting frame is arranged in the sewage tank, an adjusting part is mounted in the membrane mounting frame, the two membrane assemblies are mounted on the membrane mounting frame, the flow guide pipe is located above the sewage tank, and the driving part is connected with the flow guide pipe. The driving piece is mounted on the membrane component, and a backwashing component is mounted on the driving piece. According to the utility model, the disassembly and assembly can be reduced in the detection process, so that two groups can be detected repeatedly at the same time, the detection is more accurate, and meanwhile, the membrane modules with different lengths can be detected and used more conveniently.

The application discloses a method for improving the flux and hydrophobicity of a uniform pore membrane by selective fluorination, comprising the following steps: immersing a uniform pore membrane with a pore size of 5-100 nm and containing carboxyl functional groups into a reaction solution, wherein the reaction solution comprises a silver salt catalyst with a mass concentration in the range of 0.1-3.5 wt%, a fluorination reagent with a mass concentration in the range of 0.15-5.5 wt%, an oxidizing agent with a mass concentration in the range of 0.05-7.5 wt%, a co-catalyst with a mass concentration in the range of 0.15-5.5 wt%, water and an organic solvent with a mass concentration in the range of 5-65 wt%; reacting at 4-60 DEG C for 15 min-72 h, taking out the membrane, and then sequentially cleaning the membrane with ethanol and deionized water to obtain a uniform pore membrane with good membrane flux and hydrophobicity. The application improves the permeability and separation selectivity of the uniform pore membrane by selective fluorination, and the uniform pore membrane is not damaged, and the method has universality.

This invention discloses a reverse osmosis water treatment device, relating to the field of wastewater treatment technology. The device includes a treatment tank installed on the ground; a support pipe fixed to the treatment tank via brackets at both ends; and a collection pipe arranged concentrically within the support pipe. One end of the support pipe has an inlet component fixed to it, which is rotatably connected to a rotating shaft fixed to the end of the collection pipe. A torsion spring is mounted on the rotating shaft. A sealing baffle is fixed to the end of the support pipe away from the inlet component, and an outlet component is fixed to the sealing baffle. The outlet component is connected to and rotatably sealed within the collection pipe. Through the coordinated design of a synchronous deployment mechanism and an automatic reversing cleaning component, dynamic deployment and thorough cleaning of the membrane are achieved, completely removing suspended solids and other contaminants from the membrane surface and gaps. Compared to existing pretreatment technologies to mitigate contamination, this device avoids irreversible membrane fouling, extends the stable membrane flux maintenance period, and significantly reduces membrane replacement and chemical cleaning costs.

The invention relates to the technical field of natural product separation, and discloses a coix seed melanin decomposition component extraction method based on membrane separation. The method comprises the following steps: acquiring preprocessing parameters of a coix seed raw material and optical characteristic data of an initial suspension; dividing a light transmittance stable stage and a light transmittance jump stage according to the variation trend of the optical characteristic data along with the processing duration; screening a target separation level based on a two-stage suspension particle size distribution difference coefficient; under the target separation level, calculating a separation efficiency index by combining the transmembrane flux attenuation characteristic of the membrane component, the membrane pore size distribution and the operation pressure parameter; determining a cycle tolerance factor based on the residue component concentration and the membrane contamination rate; screening a target membrane component according to the circulating tolerance factor, and constructing a multi-stage membrane separation sequence in combination with penetrating fluid component data; and executing a gradient extraction process. The method realizes efficient extraction of melanin decomposition components of coix seeds, improves the separation efficiency and the cycle stability, and is suitable for separation and purification of active components of natural products.

The invention relates to the technical field of high-salt industrial wastewater treatment, in particular to a membrane distillation concentration recycling device for high-salt industrial wastewater, which comprises a base main body, a wastewater tank is fixedly connected to the front end of the top of the base main body, a pretreatment unit is arranged on the outer side of the wastewater tank, and a heating tank is arranged on the outer side of the pretreatment unit. Compared with an existing membrane distillation concentration recycling device, the problems that most of water flow channels of a traditional membrane distillation device are designed to be straight channels, water flow makes insufficient contact with a hydrophobic membrane, a laminar flow state is likely to be formed, a large number of mass transfer dead angles exist, the water vapor permeation rate is low, the fresh water output efficiency is low, and the like are solved. The problems that suspended impurities and salt ions in wastewater are easy to deposit on the surface of a membrane, membrane holes are blocked, the membrane flux is rapidly attenuated, frequent chemical cleaning is needed, the operation and maintenance cost is increased, and the service life of the membrane is shortened are solved.

The invention belongs to the field of polymer separation membranes, and particularly discloses a hydrophilic antibacterial oil-water separation polyphenylene sulfide membrane material and a preparation method and application thereof, and the preparation method comprises the following steps: (S1) preparing a PPS microporous membrane by a thermally induced phase separation method; (S2) treating the PPS microporous membrane in a dilute nitric acid solution to obtain a nitric acid modified hPPS microporous membrane; (S3) dispersing CNF in water to obtain a CNF dispersion liquid; coating the surface of the hPPS membrane with the CNF dispersion liquid in a suction filtration deposition manner, and dipping the hPPS membrane in a solution containing Fe < 3 + > to obtain a CNF-hPPS membrane; and (S4) dipping the CNF-hPPS in a (hexamethyleneguanidine) hydrochloride solution to obtain the hydrophilic antibacterial oil-water separation polyphenylene sulfide membrane material. The polyphenylene sulfide micro (PPS) porous membrane is prepared by adopting a thermally induced phase separation method, and after acidizing treatment, cellulose nanofiber (CNF) and polyhexamethylene guanidine (PHMG) with specific content are combined in an ion complexing manner, so that the oil-water separation rate and antibacterial effect of the membrane are greatly improved under the condition of lower loss of membrane flux.

The application provides a PVDF porous membrane for removing viruses, a preparation method and a filter element, the porous membrane is made of PVDF material, comprises a main body, one side of the main body is a first porous surface, the other side of the main body is a second porous surface, the SEM measurement average pore size gradient of the main body is 2-12 nm / μm; the pore size gradient of the porous membrane is small; in the wet state of the porous membrane main body, the part of capturing 20 nm colloidal gold is D20, D20 is the area from the first porous surface and located at 20%-100% of the film thickness, part of the 20 nm colloidal gold is located at the second porous surface; the thickness of D20 is 15-35 μm; the porous membrane has good interception effect on 20 nm colloidal gold; meanwhile, the pore size of the small pore area is large, so that the membrane flux is high and the flux attenuation is slow, the mechanical strength is high, and the porous membrane is particularly suitable for filtering high-concentration protein fluid; the LRV value of the porous membrane for 20 nm colloidal gold is greater than 2 and less than 4, the double-layer stacking is used in actual use, and the risk of virus leakage is avoided; the preparation method is simple, fast, effective, green and environment-friendly.

The present application relates to sewage treatment technical field, disclose a kind of MBR process with high membrane flux and high-efficiency phosphorus removal, the MBR process is between aerobic zone and MBR membrane pool Setting flow guide area and sedimentation area;Flow guide area and aerobic zone between being equipped with flow guide wall flow guide wall being equipped with flow guide hole, flow guide area and sedimentation area between being equipped with partition wall, water inlet being opened in the upper portion of partition wall, the sewage of flow guide area is buffered to the aerobic zone into sedimentation area;Sedimentation area and MBR membrane pool between being equipped with triangular weir plate, the sewage before entering MBR membrane pool is treated by sedimentation in sedimentation area, to reduce the membrane pollution speed, extend the service life of membrane group device.The MBR process with high membrane flux and high-efficiency phosphorus removal is mainly to the postpositioned anoxic section of biochemical reaction tank is reformed, without new building, by increasing some equipment and to postpositioned anoxic section local reformation can be realized, save operating cost, reduce the membrane pollution speed, extend the service life of membrane group device.

The present application relates to a kind of reverse osmosis membrane pollution control method based on green biological scale inhibition, especially suitable for reverse osmosis membrane pollution treatment in industrial wastewater zero discharge system.The method comprises: regulating the composition of influent organic components by sand filter pretreatment unit, using the microbial community and its extracellular polymeric substance naturally enriched in sand filter process, without additional bacteria or chemical scale inhibitor, can directly interfere with the nucleation and crystallization process of inorganic scale on membrane surface, to form loose reversible pollution layer structure.The method effectively reduces the scale rate of inorganic salts such as calcium carbonate, inhibits membrane surface biological pollution, delays the densification of pollution layer, improves membrane flux retention rate, prolongs membrane operation cycle, reduces cleaning frequency.Compared with the existing conventional physical or chemical pretreatment method, the present application makes full use of the natural scale inhibition effect of the ecological system in sand filter unit, has the advantages of low operating cost, environmental friendly, strong adaptability and the like.

The application relates to a preparation method and application of a super-hydrophobic membrane with high-temperature self-repairing performance, and relates to a preparation method and application of a super-hydrophobic membrane.The application aims to solve the problems that the super-hydrophobic membrane used for membrane distillation will appear in flux decline and a large increase in the conductivity of the permeate after a long time of operation, and the water treatment performance of the membrane will be reduced after acid washing, and even the membrane cannot continue to operate.Method: I, Fenton reaction pretreatment;II, preparation of a bottom super-hydrophobic layer;III, preparation of a PVA middle layer;IV, preparation of a top super-hydrophobic layer.The super-hydrophobic membrane with high-temperature self-repairing performance is used as a membrane for membrane distillation.The prepared membrane with high-temperature self-repairing performance has high super-hydrophobic performance and self-repairing performance.A super-hydrophobic membrane with high-temperature self-repairing performance can be obtained.