54results about How to "Slow the rate of pollution" patented technology

The inveniton provides a hydrophilic modification method for a polytetrafluoroethylene membrane. The method comprises the following steps: step 1, subjecting the polytetrafluoroethylene membrane to plasma treatment under a nitrogen atmosphere, and allowing the surface of the polytetrafluoroethylene membrane to generate relatively-stable free radicals and active sites; step 2, placing the polytetrafluoroethylene membrane into an acylic acid solution and carrying out static impregnation for a period of time, then taking the polytetrafluoroethylene membrane out of the solution and then placing the polytetrafluoroethylene membrane between two glase plates, and carrying out thermochemical polymerization in a vacuum drying oven so as to obtain the polytetrafluoroethylene membrane with the surface grafted with polyacrylic acid; and step 3, subjecting the polytetrafluoroethylene membrane to static impregnation in a titanium dioxide sol for a period of time, and allowing titanium dioxide to be assembled onto the surface of the polytetrafluoroethylene membrane through the coordination effect of metal titanium-ion Ti4+ and a carboxyl group on the polyacrylic acid so as to obtain a hydrophilic modified polytetrafluoroethylene membrane. The hydrophilic modified polytetrafluoroethylene membrane prepared by using the method in the invention retains excellent properties of a conventional polytetrafluoroethylene membrane and greatly improves filter performance, hydrophilic property, pollution resistant property and photocatalytic property of the polytetrafluoroethylene membrane.

The invention belongs to the technical field of waste water treatment and particularly relates to a garbage leachate treating device. By virtue of the garbage leachate treating device, an adsorption-coagulation-nitrosation-anaerobic ammonium oxidation-aerobic treatment-membrane bioreactor combined process can be applied to the treatment of garbage leachate. The garbage leachate treating device comprises the following three parts: a. a pretreatment part which is formed by means of sequentially connecting an adsorption tank, a coagulation tank and a sedimentation tank; b. a denitrification part which is formed by a nitrosation reactor and an anaerobic ammonium oxidation reactor; and c. a main body treatment part which is formed by an aerobiotic tank and a membrane tank. Aiming at the water quality characteristics of the garbage leachate, the garbage leachate treating device organically combines a physicochemical treatment unit and a biological treatment unit; simultaneously the treating device is transformed reasonably and has the advantages of short and compact technological process, high treatment efficiency, low energy consumption, long membrane-component service life, and the like.

The invention discloses a device and a method for processing a coking wastewater by adopting a suspended filler-anaerobic membrane bioreactor, belonging to the field of coking wastewater treatment. The device comprises an anaerobic reaction pool and a sludge sedimentation pool, wherein a micropore aeration system, a suspended particle packing, a membrane module and a stirring system are arranged inside the anaerobic reaction pool; the activated sludge in the anaerobic reaction pool takes a biological membrane attached to the suspended particle packing as a main component; the suspended activated sludge is collected, separated and discharged out of the system through the sludge sedimentation pool; and synchronous nitrification and denitrification functions of the biological membrane on the suspended packing are enhanced by stirring for fluidization of the stirring system under an anaerobic condition, thereby achieving the treatment effect of synchronously removing chemical oxygen demand (COD) and total nitrogen in the coking wastewater. By adopting the device, the aeration rate is significantly reduced, and the operating cost is reduced. The activated sludge takes the biological membrane in the attached state as the primary component, so that the contact frequency of the activated sludge and the membrane module filtering surface is reduced, and the membrane pollution process is effectively retarded by the scraping effect of the suspended particle packing.

The invention relates to the field of sewage reuse, and particularly relates to an integrated MBR (Membrane Bio-Reactor). The integrated MBR is divided into an anoxic area and an aerobic area by using a baffle structure, carbon fiber packing is hung in the anoxic area, and an aeration device and a membrane assembly are placed in the aerobic area; the volume ratio of the anoxic area to the aerobic area is 1:3. The integrated MBR has the characteristics that due to the adoption of an integrated reaction device, the mode of multi-section processing in a single biochemical environment is solved, and the land-occupied area is saved; according to the structure characteristics, sewage circularly flows between the anoxic area and the aerobic area under the action of aeration, and shows different water flow characteristics; the device can simultaneously and effectively perform nitrification and denitrification processes, so that the sludge return is saved, thereby reducing the capital expenditure and the operation cost, and under the condition that the overall sludge concentration is not changed, the sludge concentration of the anoxic area is increased, and the sludge concentration of the aerobic area is reduced, thereby effectively reducing the membrane pollution; a carbon source required by denitrification is supplemented in a mode of feeding water from the anoxic area, thereby saving the cost.

Belonging to the technical field of environmental sewage treatment, the invention in particular relates to a method for direct filtration of municipal wastewater with a plate ceramic membrane. The method includes the three processes of: 1) performing coagulation to promote the destabilization settlement of suspended particles and organic pollutants; 2) letting a coagulated suspension flow into a plate ceramic membrane reactor, and conducting low pressure filtering to obtain purified effluent water; and 3) performing online / offline backwash process to control membrane pollution. The method provided by the invention can effectively reduce the concentration of organic matters and phosphorus in water and reduce the membrane pollution rate.

The invention provides an extracting agent for removing toxic pollutants of 2.4-D and 2.4-dichlorophenol in 2.4-D pesticide production wastewater, which mainly comprises a complexing agent, a cosolvent and a diluent. The extraction process can adopt the traditional extraction process, and the extracting agent can also be used as a supporting liquid membrane. The extracting agent provided by the invention has the advantages of high extraction efficiency, low effluent wastage rate, easy engendering transformation, low regeneration loss and the like, and is a key technology for solving the treatment and recovery of 2.4-D pesticide production waste water.

The invention relates to a membrane pollution optimized control specialist system of a membrane reactor, which belongs to the cross field of environmental engineering techniques and computer software techniques and is characterized by building a technological parameter adjusting and controlling rule of the membrane reactor, constructing the membrane pollution optimized control specialist system of the membrane reactor, realizing the prediction and the specialist diagnose of the membrane pollution aggravation of the membrane reactor and completing the automatic adjusting and controlling function according to the weight and the direction of membrane pollution factors in active sludge mixture of the membrane reactor for treating life sewage under different working conditions to the membrane pollution influence, thereby realizing effective delay of the membrane pollution speed. The system has self-learning capacity, and a succeed adjusting and controlling case expands the rule base through the self-learning of the system. The invention can effectively prolong the service life of the membrane assembly, reduce the chemical agent consumption and lower the operation cost. The effective control of the membrane can lead the process of the membrane reactor to be more suitable for the national conditions, thereby promoting the development of water saving program.

The invention provides a process for processing 2,4-D (2,4-dichlorophenoxyacetic acid) pesticide wastewater, comprising the following steps: extracting the wastewater by using an oil-phase extractant to remove a part of organic matters, adding water phase into an adsorbing system to further remove organic matters, removing salt by using a nanofiltration membrane and optionally cleaning the nanofiltration membrane. The organic matters and the salt in the wastewater can be extracted, concentrated, separated and recycled, and a 2,4-D pesticide wastewater quasi-zero emitting processing cleaner producing process system is formed integrally.

The invention provides a plasma sealing structure for a discharge chamber of an annular magnetic steel ring cutting field ion thruster. The plasma sealing structure comprises a ceramic ring, a shielding cover and a Z-shaped sealing ring; peripheral equipment comprises a grid assembly, an anode, an insulation supporting assembly and a supporting ring of the ion thruster, and the anode is of a stepped cylinder structure and comprises a large-diameter cylinder and a small-diameter cylinder; the shielding cover is installed on the outer wall of the upper end of the small-diameter cylinder of the anode, the ceramic ring is located below the shielding cover and fixed to the end face between the large-diameter cylinder and the small-diameter cylinder of the anode, and the shielding cover shieldspart of the end face of the ceramic ring and the inner wall face of the ceramic ring to realize shielding and realize electric insulation between the anode and the grid assembly; and the horizontal end face of one side of the Z-shaped sealing ring is fixed to the bottom face of the grid assembly, and the horizontal end face of the other side is compressed at the top end of the ceramic ring to complete plasma sealing of the discharge chamber. The problems of electric insulation between the grid assembly and the anode of the ion thruster in a long-term plasma environment and plasma sealing of the discharge chamber are solved.

The invention discloses an anaerobic electrochemical sludge disposal device of an electrode coupled flat sheet membrane. The device is characterized in that membrane hanging electrodes formed by carbon felts and titanium nets are arranged on two sides of the flat sheet membrane; the membrane hanging electrodes and a flat sheet membrane assembly are supported by two fixed baffle plates and are arranged above an aerating pipe; the carbon felts / carbon cloth are / is arranged on two sides of the flat sheet membrane assembly at an interval of 10-15 mm; the titanium nets are attached to the outer sides of the carbon felts / carbon cloth. Compared with the prior art, the anaerobic electrochemical sludge disposal device has an electric active biological membrane structure, enriches the microbial population diversity, domesticates electric active microorganisms directionally, stabilizes the metabolic environment of anaerobes inside quickly, improves the inner digestion efficiency, and can reduce deposition of flocs, colloids and the like on the flat sheet membrane, alleviates membrane pollution, improves the primer digestion efficiency, improves the effluent quality, and achieves methanation ofCO2 and in-situ upgraded purification of biogas, so that CO2 emission is reduced and recycle of a biological energy source is enhanced.

The invention relates to an efficiency improving method for a biochar addition-based anaerobic membrane bioreactor. The method comprises the following steps: 1, preparing walnut shell biochar; 2, adding the walnut shell biochar prepared in step 1 into an anaerobic membrane bioreactor which is successfully started, and taking another reactor which is not added with the walnut shell biochar as a control group; and 3, operating the reactor, operating the reactor for one cycle when the HRT is 30 d, then increasing the organic load, enabling the reactor to operate for one cycle when the HRT is 20 d, and regularly measuring various indexes in the reactor. Free syntrophic flora in a biochar enrichment fermentation system is utilized, and oxygen-containing functional groups on the surface of the biochar are utilized to excite direct electron transfer between interspecies of syntrophic methanogens, so that the kitchen waste treatment efficiency of the anaerobic membrane bioreactor is improved. At the same time, the adsorption conversion effect of the biochar on free macromolecules reduces the potential of the biochar on the membrane pollution and plugging effect, and the scouring effect of the biochar on the membrane during aeration also reduces the membrane pollution rate.

The invention discloses a preparation method and an application method of a membrane pollution inhibitor for a membrane bioreactor. The preparation comprises the following steps: respectively preparing a sodium alga acid solution, an allicin solution and a brominated furanone ethanol solution of different mass percents; dripping the solution into a calcium chloride solution, forming microspheres containing the membrane pollution inhibitor, performing suction filtration, and performing freeze drying. During specific application, the microspheres subjected to freeze drying are added into the membrane bioreactor at a time, wherein the mass concentration ratio of the addition amount to sludge concentration is 1:(50-70). According to the membrane pollution inhibitor, communication among dominant signal molecules in the membrane bioreactor can be effectively blocked, so that target genes cannot be expressed, and biological membrane formation is inhibited. The concentration of microbial metabolism products in the reactor can be obviously reduced, the membrane pollution rate is obviously reduced, the microbial growth rate is reduced, the activated sludge concentration is reduced, and the sludge treatment cost is reduced. Moreover, the preparation method and application method of the membrane pollution inhibitor have the advantages of simplicity in operation, low cost, reliability in operation, zero secondary pollution and the like.

The invention discloses a method for treating brackish-water lake water with combined processes of an ultrafiltration membrane and membrane capacitance deions. The method comprises the following steps: firstly, filtering brackish-water lake water by using an ultrafiltration membrane, retaining organic matters in the water by using the ultrafiltration membrane, and adsorbing cations and anions in the water by using a membrane capacitance deion component, thereby removing ions in the brackish-water lake water and desalting the brackish-water lake water. By virtue of the combination of the ultrafiltration membrane and the membrane capacitance deions, organic matters in water can be effectively prevented from being adhered to cation and anion ion exchange membranes and electrodes of capacitance deion devices, so that the desalting treatment effect of the membrane capacitance deion device; the method is simple to operate and has the advantages of being low in energy consumption, low in membrane pollution rate, simple to operate and the like, and pollutants in water can be effectively removed.

The invention provides a cylinder type hollow fibrous membrane assembly. The cylinder type hollow fibrous membrane assembly comprises a multi-inner-hole hollow fibrous membrane wire, a ring-shaped resin sealed end, a cylinder type membrane assembly shell, a flange end closure and a plurality of stream guidance aerating devices, wherein the inner holes of the hollow fibrous membrane are communicated with a ring-shaped dipping area; the axial direction of the hollow fibrous membrane wire is vertical to the axial direction of the membrane shell. The plurality of stream guidance aerating devices are arranged sequentially on the front end of a membrane filter area, the raw water scours the surface of the membrane from bottom to top like a spiral flow, the membrane wire damage caused by high-strength direct aerating of the lower end aerating to the membrane is avoided, the service life of the membrane is prolonged, the flow regime is stable, the collection of water is uniform, and a dead angle is avoided. The cylinder type membrane assembly can be used for a pipeline system online without additionally providing a large-area membrane pond or membrane filter area, so that the cylinder type membrane assembly has high economy and practicability.

The invention provides a split type anaerobic ceramic membrane bioreactor capable of relieving membrane pollution effectively and relates to a split type anaerobic ceramic membrane bioreactor. The split type anaerobic ceramic membrane bioreactor can effectively solve the problems that membrane pollution is serious, cleaning and replacing costs are high and the like of the conventional anaerobic process and membrane separation combined technology. The split type anaerobic ceramic membrane bioreactor capable of relieving membrane pollution effectively is provided with an anaerobic bioreactor anda ceramic membrane assembly, wherein the anaerobic bioreactor comprises a reactor outer wall, a three-phase separator, a water inlet pipe, a water outlet pipe I, a backflow pipe I, a gas collecting pipe and a sampling port; the ceramic membrane assembly comprises a water inlet, a reactor wall, a ceramic membrane, a U-shaped support, the water inlet pipe, a water outlet pipe II and a backflow pipeII. The anaerobic membrane bioreactor is combined with the ceramic membrane, municipal domestic sewage is treated effectively, inflow water can continuously wash the membrane surface by means of smaller thickness of the ceramic membrane assembly and the backflow action of the anaerobic bioreactor, and the membrane pollution rate is reduced effectively.

The invention discloses an oil-refining wastewater treatment method and device, belonging to the technical field of industrial wastewater treatment and reuse. The method comprises the following steps of: firstly performing pretreatment on oil-refining wastewater to obtain pretreated outlet water; then utilizing the pretreated outlet water to perform acclimation and culture of active sludge in a stripping type internal circulation membrane bioreactor, and adding a membrane component and powder activated carbon during the acclimation and culture process of the active sludge; and enabling the pretreated outlet water to enter the stripping type internal circulation membrane bioreactor for treatment after the end of acclimation and culture of the active sludge. According to the method disclosed by the invention, the removal efficiency of organic matters, petroleum and ammonia nitrogen in the oil-refining wastewater of the membrane bioreactor can be effectively improved, the anti-shock loading capability of the system and the stability of water quality of the outlet water are improved, and the water quality of the outlet water after treatment can achieve the second-stage emission standard of petrochemical industry, which is stipulated by GB8978-1996. According to the method disclosed by the invention, the membrane pollution rate can be effectively reduced, and the pollution and damages to a membrane by the petroleum can be effectively prevented under the situation that the petroleum content in inlet water is higher.

The invention provides an MBR membrane pool structure and a transmission system enabling an MBR membrane assembly to do reciprocating movement. The MBR membrane pool structure comprises an upper part pool interval, a middle part pool interval and a lower part pool interval, wherein a plurality of MBR membrane elements are arranged in the upper part pool interval; a sludge separation component is arranged in the middle part pool interval; a sludge settling component and a backflow sludge discharging pipe are arranged in the lower part pool interval. The transmission system comprises an MBR membrane pool structure and a transmission device based on double-arm output; a rail, a rolling wheel and a variable-frequency motor in the transmission device drive the MBR membrane assembly to do reciprocating movement. The position limiting wheels are arranged at two sides or one side of the rail; the moving range and the deviation direction of the slide frame are limited through the position limiting wheels. The MBR membrane pool structure provided by the invention has the advantages that an MBR membrane assembly device can be positioned in the upper layer low-sludge-concentration region; the membrane pollution speed can be favorably decelerated; a double-arm output transmission structure is used; great-power conduction can be realized; the operation stability is improved; through the position limiting wheel, the abrasion of the rail and the sliding wheel can be reduced; the long-time operation deviation of the rail is avoided.

The invention discloses an MBR membrane module root air inlet structure. The structure comprises a plurality of hollow fiber membrane bundles, an air inlet end member, at least one air inlet end casting member and at least one aeration branch pipe. The cross-sectional area of aeration pipes is smaller than that of an air inlet chamber, the flow rate of gas in the aeration pipes can be increased, the cutting speed is increased in the process of making contact with membrane silks, and a better gas flushing effect is achieved. Accordingly, the volume of the air inlet chamber is larger, gas of multiple aeration holes can be collected and rushes out from the aeration pipes in a short time, large bubbles can be formed conveniently, the large bubbles gradually become larger in the ascending process, and finally when the bubbles collapse, the disturbance amplitude on the liquid level is increased; the liquid turbulence effect is improved, and membrane pollution is alleviated. The aeration efficiency is improved, and the required aeration amount is greatly reduced, so that the aeration amount is reduced by 10-25% compared with a conventional membrane module.

The invention relates to a copper-containing wastewater treatment method and device. The method includes the steps thatradioactivecopper-containing wastewater, a basic cupric carbonateseed crystal and sodium carbonate in a mechanical stirring reactor react chemically through mechanical stirring, and a precipitate is deposited on the surface of seed crystal basic cupric carbonate to form large-particle dense crystal particles which fast precipitate on the bottom of the mechanical stirring reactor to remove most of copper ions; a small-particle precipitate and a seed crystal enter a membrane separator along with a supernate, and particulate matter is separated through a hollow fiber membrane to further remove the copper ions, so that the copper content of outlet water is substantially reduced. The particulate matter formed in the method is large in particle size, compact in structure and high in settling property, effectively overcomes the defects that a chemical precipitation method is large in sludge output and precipitates are poor in settling property, and increases the concentration multiple of copper treatment without causing serious membrane pollution, and the copper-containing wastewater treatment method is economical and practical.

The invention discloses a monatomic air cathode, a battery, an electrochemical system and a bioelectrochemical system and particularly relates to a cathode. The cathode comprises a current collectionlayer and a catalyst layer, wherein the catalyst layer is arranged on the current collection layer and comprises an atomic-scale disperse metal catalyst. When the atomic-scale disperse metal catalystis used for catalyzing oxygen reduction reaction in the cathode, the catalyst has the advantages of high catalytic activity, high metal utilization rate and low cost; meanwhile, when the cathode is applied to the electrochemical system, the electron utilization rate can be increased, so that the electricity generation performance of the electrochemical system is improved.

The invention discloses a two-phase anaerobic sewage treatment system. The system comprises an anaerobic fluidized bed reaction zone, a sludge settlement zone and a membrane separation zone which are sequentially arranged from bottom to top and communicated with one another. The anaerobic fluidized bed reaction zone comprises an acidogenic phase reaction zone, an intermediate regulation phase reaction zone, a methanogenic phase reaction zone and a temperature control device, wherein the acidogenic phase reaction zone, the intermediate regulation phase reaction zone and the methanogenic phase reaction zone are sequentially communicated in parallel, and the temperature control device is used for controlling the temperature of each reaction zone. Each reaction zone includes carrier particles of anaerobes. The preponderant strain of the acidogenic phase reaction zone is acidogenic bacteria, and the preponderant strain of the methanogenic phase reaction zone is methanogenic bacteria. By means of the sewage treatment system, the methane yield in sewage treatment can be increased by utilizing the characteristics of the microbial action in different stages and the strain predominance, and the durability and pollution degree of rotating membrane modules can be monitored.

The invention discloses an advection sedimentation / immersion type ultrafiltration integrated water treatment device, relating to an ultrafiltration integrated water treatment device and solving the technical problems of long process and large occupation area of an existing ultrafiltration water treatment device. The advection sedimentation / immersion type ultrafiltration integrated water treatment device comprises an advection sedimentation tank, an immersion type ultrafiltration membrane assembly, a membrane assembly supporting tool, an ultrafiltration water outlet pipe, an ultrafiltration water outlet valve, an ultrafiltration sucking pump, an online vacuum pressure sensing device, an ultrafiltration backwashing valve, an ultrafiltration backwashing pump, a bubble diffusing device, an aerating pipe, a gas flow meter, an aerating valve, an aerating pump, a steady flow plate, a mud collecting tank, a perforation mud discharging pipe, a mud discharging valve and a sawtooth-shaped backwashing overflow weir, wherein one end of the ultrafiltration water outlet pipe is communicated with the immersion filtration membrane assembly, the other end of the ultrafiltration water outlet pipe is communicated with the ultrafiltration water outlet valve, the ultrafiltration water outlet valve is connected with the ultrafiltration sucking pump, one end of the aerating pipe is connected with the bubble diffusing device, the other end of the aerating pipe is connected with the aerating valve, and the mud discharging valve is arranged at one end of the perforation mud discharging pipe, outside a tank. The advection sedimentation / immersion type ultrafiltration integrated water treatment device is mainly applied to the field of water treatment.

The invention relates to a high-efficiency integrated denitrification apparatus. The high-efficiency integrated denitrification apparatus comprises a membrane pool; an aeration-free MBR membrane vibrating device is arranged in the membrane pool; the membrane vibrating device comprises a support frame, a membrane host machine, up-and-down pulleys and a vibration traction mechanism; up-and-down supporting guide rails are arranged on the support frame; a plurality of MBR membrane modules are arranged in the membrane host machine; the membrane host machine is immersed in sewage in the membrane pool; the vibration traction mechanism is located out of the membrane pool; the membrane host machine is arranged on the up-and-down supporting guide rails via a plurality of the up-and-down pulleys and is in transmission connection with the vibration traction mechanism; and the vibration traction mechanism acts on the membrane host machine to drive the membrane host machine to carry out up-and-down vibration along the up-and-down supporting guide rails. The high-efficiency integrated denitrification apparatus provided by the invention has the advantages of reliability, stability, good decontamination effect, easiness in cleaning, thorough disinfection and excellent effluent quality; and when the membrane modules vibrates in the sewage, the accumulation of biochemical sludge on the surfaces of the membrane filaments is reduced and the contamination rate of the membrane filaments is slowed down.

The invention relates to the technical field of reverse osmosis membrane method water treatment, in particular to a reverse osmosis membrane method water treatment system which comprises a water treatment module, the water treatment module comprises a plurality of reverse osmosis membrane elements, and the reverse osmosis membrane elements are arranged in the concentrated water flow direction in the water treatment module. The water inlet flow channels of the multiple reverse osmosis membrane elements become smaller, the effective membrane area becomes larger, the number of membrane pages becomes larger, the water yield becomes higher, the permeability becomes higher, and the pollution resistance becomes weaker. According to the arrangement, through reasonable layout of the reverse osmosis membrane elements, the recovery rate of the system is improved, the pollution rate of the system is reduced, the stability and continuity of the membrane system are improved, the service life of the membrane elements is prolonged, and the operation and maintenance cost of the membrane system is reduced.

The invention provides a combined membrane biological reaction device for micro-polluted source water treatment, relates to the combined membrane biological reaction device, and particularly relates to the combined membrane biological reaction device for the micro-polluted source water treatment. With the adoption of the combined membrane biological reaction device provided by the invention, the problems that the conventional membrane biological reactor has poor de-pollution effect on micro-polluted water, serious membrane pollution and short service life of a membrane assembly can be solved. According to the combined membrane biological reaction device provided by the invention, mixed liquor of attapulgite and activated sludge are filled in a reaction container; a water inlet pump is connected with a water distribution box through a pipeline; the water inlet pump is further connected with a reaction container through the pipeline; the output end of the air pump is communicated with the pipeline between the water inlet pump and the reaction container; a membrane component is mounted inside the reaction container; the membrane component is soaked inside the mixed liquor of the attapulgite and the activated sludge; the output end of the membrane component is connected with the input end of a water outlet pump through the pipeline; and the output end of the water outlet pump is connected with a clean water box through the pipeline. The combined membrane biological reaction device provided by the invention is used for treating sewage.

The invention discloses a synchronous sludge treatment system of a membrane bioreactor and a sludge treatment method thereof. The synchronous sludge treatment system is characterized by consisting ofa reaction tank and a membrane-bioreactor, wherein the membrane-bioreactor is internally provided with a flat sheet membrane; an aeration tube which is connected with an aeration pump is arranged below the membrane-bioreactor. The sludge treatment method of the synchronous sludge treatment system comprises the following steps: pretreating sludge, carrying out membrane biological reactions, and thelike. Compared with the prior art, the membrane pollution velocity is remarkably reduced, COD (Chemical Oxygen Demand) can be removed while the membrane pollution velocity is reduced, the effluent quality is greatly improved, the burden of treatment can be further reduced, the membrane cleaning times and cost can be reduced, the process is simple, the chemical price is low, and a good applicationspace is provided for a later membrane-bioreactor process.

The invention discloses an MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and a membrane component cleaning method. A biochemical treatment system comprises an aerobic aeration tank, a middle sedimentation tank, an anoxic tank and a membrane bioreactor. The aerobic aeration tank allows pretreated oil refining wastewater to enter, and the middle sedimentation tank connected with the aerobic aeration tank is used for separation mud and water in the aerobic aeration tank to enable part of sludge to be discharged and part of precipitated sludge to flow back into the aerobic aeration tank. The anoxic tank is connected with the middle sedimentation tank, supernatant in the middle sedimentation tank enters the anoxic tank for denitrification, and the membrane bioreactor which forms an organic pollutant main removing unit is connected with the anoxic tank. The MBR system membrane component cleaning method includes: air scrubbing, online backwashing, online chemical cleaning and offline cleaning, especially online cleaning adopts high-concentration NaClO solution and low-concentration NaClO solution alternately, and offline cleaning adopts sodium dodecyl sulfate and sodium carbonate solution for cleaning or NaClO solution for cleaning.

The invention relates to a rotating magnetic field-membrane bioreactor joint ship oily sewage treatment method. The method comprises the following steps of sludge acclimatization, magnetic powder pretreatment, magnetic powder adding, rotating magnetic field increasing and cycle treatment. Accordingly, the external environment of microorganisms in activated sludge and the physical property of waterin thalli can be changed, the structure and the activity of protein and enzyme are changed, the physiological function of the microorganisms is affected, microorganism growth is promoted, and the activity of the microorganisms is improved; by putting magnetic powder in the activated sludge, the property of the activated sludge is improved conveniently, the sludge floccule particle size is increased, the sludge filtration resistance is lowered, floccule which is scattered, porous and good in air permeability is formed, and the pollution rate of an MBR membrane can be effectively slowed down; under the action of magnetic field periodicity, the magnetic powder drives the sludge rotating magnetic field to be away from the membrane surface periodically, the accumulation degree of gummy substances on the membrane surface can be lowered, and meanwhile the contribution degree of a filter cake layer to membrane pollution is reduced, so that the membrane pollution rate is greatly lowered.