117results about How to "Achieve backwash" patented technology

The invention discloses a plant rhizosphere box and the application thereof in the micro-domain research of wet land plant rhizosphere. The plant rhizosphere box comprises a box body, the inside space of the box body is partitioned into a root zone, a near root zone, a far root zone and a non-root zone and other different rhizosphere micro-domain partition zones by a number of rhizosphere partition plugging plates, water distribution units are arranged on the upper part of the box body, and water level regulating units are also arranged on the box body; and a water discharging device is arranged on the bottom of the box body. Through the adjustment of the intervals between the different rhizosphere micro-domain partition zones, the accurate observation and the research of the differentiation changes of different distances from the root system, and / or root zone soil, and / or interval water nutrients, pollutant, and / or microorganism are achieved. Based on the plant rhizosphere box, water flooded habitat of plants grown in wet land can truly be simulated, so that water flow conditions in the substrate can be maintained, and different water pressure retention time and water levels are arranged according to the needs, and the plant rhizosphere box has wide application prospect in plants, especially in the micro-domain research of wet land plant rhizosphere.

The invention discloses a household fully automatic double-membrane self-washing water purification device, which consists of a filter, a solenoid valve, a pressure switch, a control system and a water pipe. The invention is characterized in that the filer is divided into a first filter and a second filter. The raw water inlet end is connected with a third solenoid valve and a fourth solenoid valve through a pipe. The purified water outlet end is connected with the outlets of the first filter and the second filter through a pipe. The water intake of the first filter is connected with a first solenoid valve and the third solenoid valve through a pipe. The water intake of the second filter is connected with the second solenoid valve and the fourth solenoid valve through a pipe. One end of a backflushing waste water discharge port is connects with a water intake of a closet water tank. The other end of the backflushing waste water discharge port is connected with the first solenoid valve and the second solenoid valve through the pressure switch. The first, second, third, fourth solenoid valve and the pressure switch are controlled by the control system.

The invention discloses a sewage treatment device, comprising a fan, a water pump and a tank body. The upper part of the tank body is provided with a sewage inlet and an exhaust port; a Z shape separator is fixed inside the tank below the sewage inlet; the Z shape separator comprises an upper baffle plate, a vertical baffle plate, a lower baffle plate, and divides the tank body into four regions; the upper baffle plate is provided with a plurality of reflux holes, the reflux holes are equipped with anti-reflux nozzles for preventing the water above the upper baffle plate from flowing to the lower position; a membrane module is fixed below the upper baffle plate, and a hanging membrane packing assembly is fixed above the lower baffle plate; a left aeration device is fixed below the membrane assembly, and is connected with a fan outside the tank body through a gas supply pipeline; a water inlet of the water pump outside the tank body is connected with a membrane assembly water outlet duct through a water pipes; and the gas supply pipeline and the water pipe are equipped with installation valves. The device integrates two sewage treatment technology and equipment of biological membrane method and a membrane bioreactor, and has the advantages of small land occupation, and low investment and operating cost.

A related automatic cleaning filter comprises a shell, a shell cover and a shell pedestal, the shell pedestal is fixedly disposed at the bottom of the shell, and the shell cover is fixedly disposed at the top of the shell; the center of the upper surface of the shell pedestal is provided with a shaft sleeve, the upper surface of the shell pedestal is provided with a filter tank and a backwashing tank, and the lateral side of the shell pedestal is provided with a liquid inlet and a backwashing sewage-discharging port; the upper surface of the shell pedestal is provided with a filter-core pallet, the filter-core pallet is provided with multiple filter cores, the inner chamber of each filter core is communicated with the filter tank or the backwashing tank, and the top of each filter core is fixedly connected with a filter-core fixing disc; the filter-core pallet is fixedly connected with the filter-core fixing disc via a rotation shaft, and a gear motor drives the rotation shaft and the filter-core pallet to axially rotate; and the shell is provided with a clean-liquid outlet. The automatic cleaning filter is simple in integral structure, can simultaneously perform filtration and self cleaning, improves filtration and cleaning effects, can uninterruptedly work, and does not need manual maintenance, and the filter cores do not need replacing under normal working case.

The invention discloses a nitrifying bacterium enrichment culture device, which comprises an outer drum reactor and a ceramic membrane inner drum, wherein the outer drum reactor is of an opening-type structure, and the ceramic membrane inner drum, which is made from a ceramic membrane plate, is arranged in the outer drum reactor; an aerating system is arranged on the outer wall and the bottom end of the inner drum; the aerating system and sludge are separately arranged on two sides of the ceramic membrane inner drum; during aerating, the sludge is cultured in the ceramic membrane inner drum, and gas enters the inner drum by virtue of ceramic membrane holes, so that oxygen supply is achieved; a drainage port is formed in the bottom of the outer reactor, and a vacuum pump is connected to a sealed water collection tank, so that after culture, the vacuum pump is started, water is discharged to the sealed water collection tank while the sludge is intercepted by the ceramic membrane. A nitrifying bacterium enrichment culture method disclosed by the invention is implemented by virtue of the above culture device. According to the nitrifying bacterium enrichment culture device disclosed by the invention, the ceramic membrane inner drum, which is arranged in the reactor, serves as a nitrifying bacterium culture unit, so that a water changing time of sludge settlement is effectively shortened and a culture cycle is shortened; and meanwhile, sludge floc loss in water drainage is prevented and the steady growth of the sludge is guaranteed.

The invention relates to an ecological landscape revetment for river water quality control. The ecological landscape revetment comprises an aeration device as well as a base cushion layer and a plurality of module assembling layers which are arranged adjacent to a river revetment and from bottom to top, wherein a staircase structure extending from top to bottom is formed by the base cushion layerand the module assembling layers; each module assembling layer comprises a filler layer and an enclosing support layer surrounding the outer periphery of the filler layer; flow guiding holes are formed in each module assembling layer except the uppermost module assembling layer along the vertical direction and the horizontal direction in a penetrating manner; and the aeration device comprises an aerator on the river bank, an aeration branch pipe embedded in the lowermost module assembling layer and an aeration main pipe in fluid communication with an air outlet of the aerator and an air inletof the aeration branch pipe. The ecological landscape revetment disclosed by the invention not only has the functions of protecting the bank and purifying water, but also has the functions of increasing the dissolved oxygen in the water body through the aeration device and enhancing the pollutant removing effect.

The invention relates to a multifunctional efficient contact reactor and belongs to a device for water treatment. The upper part of a casing (1) is provided with a water outlet (2), a casing inner cavity is provided with a distribution tube body (4) and a reaction device (3) communicated with a water inlet pipe, the reaction device (3) is provided with a water inlet pipe section (3a) and a reactor body (3b) positioned in the distribution tube body (4), a back flow passage (4a) is arranged between the reactor body and the distribution tube body, an outlet arranged at the upper part of the reactor body is communicated with the flow back passage (4a) and an open opening arranged at the lower part of the distribution tube body (4), a combined component (5) consisting of a plurality of layers of hole plates (5a) is arranged in a reactor body inner cavity (3c), the outer side of the distribution tube body (4) is provided with a filling layer (6), an upper cavity (1a) of the casing is communicated with the water outlet (2), a lower cavity (1b) is communicated with the open opening arranged at the lower part of the distribution tube body (4), and a mud discharge opening (7) is arranged onthe lower wall of the lower cavity (1b). The flocculation or mixing effect can be effectively improved, and the multifunctional efficient contact reactor has the characteristic that multiple functions are realized by one machine.

The invention discloses a liquid flushing type multi-channel switching channel valve assembly, which comprises a valve body. A water inlet cavity, a water outlet cavity and a water drain cavity are formed in the valve body; a flow guide part I for communicating the water inlet cavity with the water outlet cavity, a flow guide part II for communicating the water outlet cavity with the water drain cavity, and a valve core assembly for controlling the alternate switching on and switching off of the flow guide part I and the flow guide part II are arranged at the junction of the water inlet cavity, the water outlet cavity and the water drain cavity; an elastic cavity which is connected with the valve core assembly and a pressure control mechanism for regulating the internal pressure of the elastic cavity are also arranged on the valve body; and due to the regulation of the pressure control mechanism, the elastic cavity expands and contracts to drive the valve core assembly to slide between the flow guide part I and the flow guide part II in a reciprocating mode, so that the alternate switching on and switching off of the flow guide part I and the flow guide part II is realized. Channel switching is finished in a pressure regulation mode, but pressure change is realized by controlling an electromagnetic valve; and the liquid flushing type multi-channel switching channel valve assembly has the advantages of simple structure, convenient control, no investment in equipment such as an air source and the like, and low manufacturing cost.

The invention provides an open ground surface water source heat pump water intaking water treatment system, comprising a water intaking system and a filtering system connected in series with the water intaking system; wherein the water intaking system consists of a water intaking head A, the water intaking head B, a water intaking pump a, a water intaking pump b, pipelines and valves; the pipelines of the water intaking head A and the water intaking head B are arranged and connected in parallel; the filtering system is formed by at least two filtering pipelines connected in parallel; and the output end of the filtering system is connected with a heat pump set Z. The system can not only efficiently avoid the blockage of the water intaking head by floating materials, but also efficiently remove sand and algae, thus preventing the floating materials, mud, sand, and the like from blocking and eroding a channel of the heat pump system and preventing the algae and the like from forming biologicalfouling on the pipe wall of the heat pump system. The back washing of the water intaking head of the system is controlled by a valve arranged on a pipeline connecting the water intaking head and a water intaking pump, thus no additional back washing system is necessary; and the back washing of a filter does not need the additional back washing system and can be achieved while the back washing of the filter is controlled by the inlet and outlet valves of the filter. The system can not only save the power consumed by the drainage of the sand and the mud with water, save infrastructure and operation expenses; but also greatly reduce the drainage, erosion and scale formation of the pipeline of the heat pump system and improves the heat exchange efficiency of the open ground surface water source heat pump system.

The invention discloses an integrated sewage treatment device based on a tidal aerated biological filter. The integrated sewage treatment device comprises a sedimentation tank, the aerated biologicalfilter, an anaerobic filter and a respiratory filter which are sequentially connected by pipes. A water inlet pipe is arranged at the upper part of the sedimentation tank, a produced water pipe is arranged at the bottom of the respiratory filter, a main filter layer and a drainage layer are arranged in the aerated biological filter sequentially from top to bottom, the main filter layer is filled with a primary filter material, the drainage layer is filled with a secondary filter material, and the particle diameter of the secondary filter material is greater than that of the primary filter material. The bottom of the drainage layer is provided with a water outlet, the water outlet is connected with a tidal drainage device, and the tidal drainage device is connected with the anaerobic filter. The integrated sewage treatment device has the advantages that the sedimentation tank is arranged at the front end of the water inlet pipe to remove most of sediments so as to ensure the water inletcondition of the filter; and the tidal aerated biological filter, the anaerobic filter and the respiratory filter constitute an aerobic-anaerobic-aerobic process combination, which has a good effecton the removal of ammonia nitrogen and other pollutants. The entire device is small in size, high in load, and low in operating energy consumption.

The invention provides a sewage disposal system for an empty tower ecological aeration filter bed. In the system, a big filter bed is arranged; multiple filter material landfill areas and an empty tower aeration area are alternatively distributed to constitute the filter bed; one side of the filter bed is provided with a T-shaped water distribution pipe, and the other side of the filter bed is connected with a drainage canal through a water discharge pipe; the filter materials, such as grails, volcanic rocks, zeolites and the like, are filled in the filter material landfill areas; filter bed surface layer planting soil is laid on the top of the filer materials; wet land plants are planted on the filter bed surface layer planting soil; the pool walls of the filter material lanfill areas at two side of the empty tower aeration area are perforated walls which are provided with a plurality of permeable holes; aeration pipes are installed at the bottom of the empty tower aeration area; the end part of the water discharge pipe extending into the drainage canal is provided with a rubber ripple sleeve which is provided with a rope, and the rope is drained out of the drainage canal; and the upper end of the drainage canal is provided with an observation well cover. The sewage disposal system is convenient for overhauling, the efficient denitrification of the filter bed is achieved, the drainage height of the filter bed can be controlled at random, and the short current of the filer bed is avoided.

The invention relates to a returning back suction type fiber filter and a sewage treatment method thereof. Filtering holes are symmetrically formed between a sewage pool and a filtrate tank; filteringplates are fixedly arranged on the filtering holes; sewage in the sewage pool is filtered by the filtering plates and then enters into the filtrate tank; sludge absorbers are arranged on one side ofthe filtering plates on the sewage pool; the sludge absorbers respectively do lifting or horizontal synchronous reverse sludge-absorbing motion under the action of driving mechanisms; when the filtering plates are blocked, the liquid level of the sewage in the sewage pool rises; when the liquid level of the sewage in the sewage pool reaches the liquid level set by a liquid sensor, the sludge absorbers are controlled and started to back suck the sludge on the filtering plates, and meanwhile, the driving mechanisms are started to drive the two sets of sludge absorbers to do lifting or horizontalsynchronous reverse sludge-absorbing motion, so as to suck the sludge on the filtering plates and recover the filtering capacity of the filtering plates. The sewage treatment device provided by the invention is low in cost, is high in sewage treatment capacity and has an excellent sewage treatment effect.

The invention relates to an unpowered biological filter chamber water purification system having both the oxygen increasing function and the back flushing function, which belongs to the water treatment technique field. The system is composed of an unpowered biological filter chamber and two sedimentation tanks, can implement biochemical reactions such as anaerobic reaction, facultative reaction and aerobic reaction without power, and has obvious effects of denitrogenation and phosphorus fixing to sewage, and the system can be used for the unpowered back flushing and oxygen increasing and keeping the biological filter chamber from being blocked after long-term running. Compared with the prior art, the system has the following effects of: (1) stable water purification effect and good effluent water quality; (2) energy saving and realizable unpowered oxygen increasing and back flushing; (3) low project investment and running costs; and (4) simple structure and convenient operation management. The system can be used for purifying landscape water, tail water of sewage plants, domestic and agricultural wastewater with medium and low pollution, and can also be used as an independent water purification unit, and a plurality of units can be used in series, thereby realizing the purification treatment to sewage with rather high concentration.

The invention discloses an integrated domestic sewage treatment device with a novel structure. The sewage treatment device comprises an A-A' biological reaction tank, an O biological reaction tank, an FCD (Flocculation Control Device) reaction tank which are sequentially connected and arranged transversely, wherein the A-A' biological reaction tank and the O biological reaction tank constitute an anaerobic-anoxic-aerobic biological treatment system; since the A-A' biological reaction tank and O biological reaction tank both operate under the conditions that water and gas are supplied at a low pressure and the A-A' biological reaction tank and O biological reaction tank are sealed and equipped with particle fillers, the contents of oxygen dissolved in water and microbes are greatly increased. The FCD reaction tank is used for filtering water treated by the A-A'-O system and storing and disinfecting the cleaned water; a backwash water and gas inlet is arranged at the bottom of each of the FCD reactor tank, A-A' biological reaction tank and O biological reaction tank, and the top of the FCD reactor tank, the A-A' biological reaction tank and the O biological reaction tank are respectively connected with a backwash water outlet which is connected with the sludge inlet of the sedimentation-regulation tank; and a backwash mode of the treatment device is vertical backwash perpendicular to the water flowing direction.

The invention discloses a household fully automatic double-membrane self-washing water purification device, which consists of a filter, a solenoid valve, a pressure switch, a control system and a water pipe. The invention is characterized in that the filer is divided into a first filter and a second filter. The raw water inlet end is connected with a third solenoid valve and a fourth solenoid valve through a pipe. The purified water outlet end is connected with the outlets of the first filter and the second filter through a pipe. The water intake of the first filter is connected with a first solenoid valve and the third solenoid valve through a pipe. The water intake of the second filter is connected with the second solenoid valve and the fourth solenoid valve through a pipe. One end of abackflushing waste water discharge port is connects with a water intake of a closet water tank. The other end of the backflushing waste water discharge port is connected with the first solenoid valveand the second solenoid valve through the pressure switch. The first, second, third, fourth solenoid valve and the pressure switch are controlled by the control system.

The invention provides an automatic cap-pressing residue-removing wine fermentation tank. The automatic cap-pressing residue-removing wine fermentation tank comprises a tank body; an upper manhole anda lower manhole are formed in the side faces of the upper end and the lower portion of the tank body respectively; a sieve plate is transversely arranged on the lower side of the lower manhole in thetank body; the bottom of the tank body is communicated with a back washing pipe; a spiral blade is further vertically and rotationally arranged on the upper portion in the tank body; a telescopic rodarranged in the vertical direction is fixedly connected to the middle of the upper end of the spiral blade; the upper end of the telescopic rod penetrates through the tank body and extends to the position above the tank body; a driving motor is further arranged above the tank body; and the upper end of the telescopic rod is in transmission connection with an output shaft of the driving motor. Theproblems that the spraying effect in the early stage of fermentation is poor, the labour intensity of residue digging after fermentation is high, the production efficiency is low or operation is difficult when a tank door is opened, and if skin residues are wet, the skin residues can be sprayed out and are not easy to control are solved. The invention belongs to the technical field of wine brewing.

The invention discloses an environment-friendly domestic sewage treatment device in the technical field of domestic sewage treatment. A water inlet is formed in the top of a box body; the output end of the right side of a crushing motor is connected with a crushing rod through a coupler; a partition plate, a filter plate, a first filter layer and a second filter layer are sequentially arranged inan inner cavity of the box body from top to bottom; two groups of ultraviolet sterilization lamps are symmetrically mounted at the bottoms of left and right inner walls of the box body; a hollow rotating roller is mounted at the output end of a rotating motor. The device is simple to operate and environment-friendly; fine suspended matters, soluble small molecular organic matters, chromaticity, residual chlorine and other substances in sewage are filtered again through the first filtering layer and the second filtering layer; and finally, the filtered sewage is sterilized through the ultraviolet sterilization lamps, rotating brush bristles sweep the grounds everywhere in a family, the labor intensity of workers is effectively reduced, and the utilization rate of water resources is effectively increased.

The invention discloses a large-flow recycling filter element and matched cleaning process equipment and an operation method. The product comprises an outer support barrel, wherein an inner support barrel is mounted in the outer support barrel, a filter material is contained between the outer support barrel and the inner support barrel, the bottom of the outer support barrel is connected with a lower end cover connected with a support frame, the top of the inner support barrel is connected with a sealing head, the sealing head is connected with an upper end cover, the upper end cover is connected with the outer support barrel, and the outer support barrel, the inner support barrel, the filter material and the sealing head constitute a cleaning filter element. The equipment is used for filter element cleaning.

The invention discloses a turbid matter and dirt removal water quality purification device for underground water. The turbid matter and dirt removal water quality purification device is characterizedby comprising an outer tube, an inner tube, a mixing unit, a flocculation unit, a filtering unit, an aeration unit and a water collection unit, wherein the outer tube is a sealed tube body; the innertube is arranged in the outer tube in a suspended way through an insertion and connection opening formed in the top of the outer tube; the top of the inner tube is sealed; the filtering water flow realizes the circulation with the inside of the outer tube through the bottom of the inner tube; a first automatic exhaust valve is arranged on the top of the inner tube; a second automatic exhaust valveis arranged on the top of the outer tube. The structural design has the advantages that the turbid matter and dirt removal can be realized without great height differences; the problem of elevation arrangement difficulty is solved. The device can realize the multifunction of mixing, flocculation, filtering, aeration, reverse flushing and the like; the problems of great occupied area, elevation arrangement difficulty and pipeline connection complexity of a conventional turbid matter and dirt removal facility are also solved.

The invention discloses a multipath communicated pumping-recharging integrated treatment method for polluted water-soil in-situ remediation. The treatment method is characterized by comprising the steps of: within the scope of a polluted site, laying several rows of well-point pipes, one ends of the well-point pipes within one row are communicated with a transverse branch pipe, the input end of the transverse branch pipe is equipped with a recharging valve, and the output end is equipped with a water outlet valve; the input ends of all transverse branch pipes are communicated with a recharging device, and the input ends are communicated with a water collecting device; while water pumping is carried out, the recharging valves are closed and the water outlet valves are opened, the water collecting device is started to water pumping and draining on the polluted water-soil through the well-point pipes; while recharging is carried out, the recharging valves are opened and the water outlet valves are closed, the recharging device is started to recharge the polluted water-soil with clear water or medicaments through the well-point pipes. The treatment method provided by the invention integrates water pumping and recharging, has high treatment efficiency, and can realize fine management.

The invention discloses a water purification filter for a water-saving irrigation system. The water purification filter comprises a shell (5) with a water inlet (1) and a water outlet (8), at least two layer of filter screens of different specifications are arranged between the water inlet (1) and the water outlet (8), drain outlets are formed in one side of the water inlet (1) and between the two layers of filter screens, the drain outlet A (12) is formed in one side of water inlet (1), the drain outlet B (11) is formed between the two layers of filter screens, a back flush water inlet (4) is formed in the position, in one side of the water outlet (8), of the shell (5), and the back flush water inlet (4) is at least formed in the position, opposite to the drain outlet B (11), of the other side of the shell (5). Compared with the prior art, the advantages that the function of achieving double filtering and back flush can be achieved, operation and use can be automatically and conveniently controlled, and back flush can be achieved under the condition of not opening the filter are achieved.

The invention discloses a device for efficiently removing impurities from sewage. The device comprises a pollution discharge tank, a water inlet tank and a treatment chamber from bottom to top sequentially, wherein a water inlet is formed in the bottom of the side wall of the water inlet tank, a water outlet is formed in the top of the side wall of the treatment chamber, a plurality of filter screens are arranged in the treatment chamber from top to bottom, the sewage enters the water inlet tank from the water inlet and upwards enters the treatment chamber, the filter screens from bottom to top form a parallel-connection structure, the efficiency of removing the impurities from the sewage is increased, and the filter screens are not prone to blockage; a discharge port is formed in one sideof the bottom surface of the water inlet tank, a baffle plate is arranged at the discharge port, a control tank is arranged above the baffle plate, a buoyancy control mechanism is arranged in the control tank, when the filter screens are blocked, the sewage of the water inlet tank enters the control tank, the baffle plate is pulled up by the buoyancy control mechanism, the discharge port is open,water in the water inlet tank and the treatment chamber washes the filter screens from top to bottom and is discharged through a drain outlet. Automatic back wash can be realized without high pressure, so that electric energy is saved, and large-particle impurity pollutants in the sewage can be effectively removed.

The invention discloses a heat exchange device capable of realizing heat recovery of multiple heat sources. The heat exchange device comprises a housing, a plurality of heat source output runners arranged at the upper end of the housing, a plurality of heat source input runners arranged at the lower end of the housing and a core connected to the interior of the housing, wherein a plurality of partitions are connected between the outer wall of the core and the inner wall of the housing and divide a cavity formed between the housing and the core into a plurality of heating medium runners allowing a heating medium to pass and a plurality of heat source runners allowing the heat sources to pass, and the heat source runners and the heating medium runners are in alternative distribution; the upper ends of the heat source runners are connected and in one-to-one correspondence with the heat source output runners in a communicating manner; the lower ends of the heat source runners are connected and in one-to-one correspondence with the heat source input runners in a communicating manner; and the upper ends and the lower ends of the heating medium runners are connected with a heating medium input opening in the upper end of the housing and a heating medium output opening in the lower end of the housing. The heat exchange device has the advantages that the number of the heat sources of waste heat can be flexibly increased or reduced, the structure is simple, the occupied space is small and the heat exchange effect is good.

The invention relates to a device which carries out the filtration on the fluid medium conveyed by the pipeline, in particular to a cleanable filter which can realize the hydrocyclone separation, surface interception and deep filtration of the impurity in the fluid medium at the same time. The filter is provided with a filter unit which consists of a filter unit shell and a valve body which are connected with each other; one side of the valve body is provided with a unit medium inlet and the other side thereof is provided with a sewage outlet; the internal side of the valve body is provided with a hydrocyclone passage; one side of the hydrocyclone passage is provided with a diaphragm valve port which is provided with an inlet diaphragm sheet; the other side of the hydrocyclone passage is provided with a sewage drainage diaphragm valve port which is provided with the sewage drainage port diaphragm sheet. Due to the design of the hydrocyclone passage, the device of the invention leads the medium to form the hydrocyclone when entering the filter unit, leads most impurities in the medium to be thrown towards the internal wall of the filter unit shell by the hydrocyclone centrifuging and be far away from a disc column, thus greatly lightening the filter load of the disc column and prolonging the service life of the filter.

The invention discloses a secondary sewage treatment tank with a backwashing device. The secondary sewage treatment tank comprises a primary sewage tank and a secondary sewage tank. A filter pipe is connected between tank bodies on the lower sides of the primary sewage tank and the secondary sewage tank, and a filter is disposed in the filter pipe. A front end orifice and a rear end orifice of thefilter pipe are respectively provided with a first three-way valve and a second three-way valve. One end of the first three-way valve is communicated to the filter pipe, and the other end is communicated to an opening of the primary sewage tank through a water distribution pipe. One end of the second three-way valve is communicated to the filter pipe, the other end is communicated to an opening of a backwashing pump, and the other end of the backwashing pump is connected to the pipe body between the filter and the second three-way valve through a connecting pipe. The secondary sewage treatment tank with the backwashing device is simple in overall structure, easy to install and manufacture, convenient to operate and capable of effectively achieving the backwashing process of the filter inthe filter pipe, improves the filtering effect of the filter, saves manual maintenance strength and achieves high practicability.

The invention discloses a portable multifunctional integrated water purification device, and belongs to the field of feedwater treatment devices. The portable multifunctional integrated water purification device comprises a water inlet pipe, a manual pressurizing device, a polyester fiber filter, an activated carbon filter and an ultrafiltration membrane filter; the manual pressurizing device comprises a wrenching rod, a connecting rod, a piston, a sealing ring and a piston cylinder; the manual pressurizing device is used for making the piston move up and down by pressing the handheld end of the wrenching rod up and down; the polyester fiber filter, the activated carbon filter and the ultrafiltration membrane filter are connected in sequence through a pipeline to achieve water purificationin sequence. According to the portable multifunctional integrated water purification device, through the combination of several treatment units, various contaminants in water can be effectively removed, and different effluent qualities can be achieved according to different water demands under the condition of the same water source. Electric pressurizing equipment and manual pressurizing equipment are provided, and the portable multifunctional integrated water purification device can be applicable to various scenes, and play a huge role particularly in regions with electricity utilization difficulty and fields.

The invention discloses a membrane transfer coating MBR membrane and a preparation method thereof. The preparation method comprises the steps of respectively and synchronously coating two transfer membranes with a membrane casting solution; spraying an acrylate adhesion promoter on the surface of the membrane casting solution; transferring two MBR wet membrane layers loaded on the transfer membrane to the upper surface and the lower surface of a supporting material at the same time, and carrying out vertical rolling compounding to obtain a compounded MBR wet membrane; feeding the two MBR wet membranes loaded on the transfer membrane into a coagulating bath for coagulating, and automatically stripping the transfer membrane from an MBR coagulating membrane layer after coagulating is completed; enabling the stripped MBR membrane to enter a washing bath, and washing and drying to obtain the MBR membrane. According to the invention, a membrane transfer coating mode is adopted, so that the thickness is accurate and controllable, membrane liquid is prevented from permeating into the supporting material, and two wet membrane layers are consistent in structure and performance; the binding force of the membrane layer and the supporting material is improved, the life cycle of the MBR membrane is prolonged, and high-pressure backwashing is realized; and the preparation process is simple tooperate, and integrated production can be realized.