69results about How to "Improve backwashing effect" patented technology

The invention provides a coalescence-selective filtration-deep bed filtration efficient oil-water separation system which comprises a coalescence system, a selective filtration system and a deep bed filtration system, oily wastewater enters a coalescer, and tiny oil droplets are coalesced into larger oil droplets through wetting coalescence and collision coalescence; the coalesced wastewater enters a selective filter, oil droplets and water respectively flow out through an oil channel and a water channel, and primary separation is realized; according to the present invention, the water after the primary separation enters the deep bed filter to achieve the deep separation, the efficient oil-water separation and the water quality standard discharge or reuse are achieved through the combination process of coalescence, selective filtration and deep bed filtration, and the system has advantages of high treatment efficiency, low energy consumption, less carbon emission, oil and water recycling, or water standard discharge.

The invention discloses a sewage treatment device, and belongs to the technical field of sewage treatment, the sewage treatment device comprises a filtering tank and a filtering cylinder arranged in the filtering tank, one end of the filtering tank is provided with a sewage discharging cylinder, and a cleaning device is arranged between the filtering cylinder and the sewage discharging cylinder; and a knocking assembly synchronously acting with the cleaning device is arranged between the filter cylinder and the sewage discharge cylinder. According to the scheme, the cleaning device and the knocking assembly are arranged at the position, close to the pollution discharge cylinder, of the filter cylinder, impurities and dirt at the bottom of the filter cylinder can be cleaned, and the impurities are prevented from blocking the bottom of the filter cylinder and affecting the pollution discharge effect of the pollution discharge cylinder in the backwashing process; the cleaning device and the knocking assembly can act simultaneously, and while the cleaning device cleans the bottom of the filter cartridge, the knocking assembly knocks the structure at the bottom of the filter cartridge, so that impurities attached to the bottom of the filter cartridge are shaken off, the bottom of the filter cartridge is backwashed and dredged, and the backwash effect and the pollution discharge capacity of the sewage treatment device are improved.

The invention discloses a wastewater environment-friendly treatment device for expressway construction, and relates to the technical field of water treatment.The wastewater environment-friendly treatment device comprises a supporting frame.The position, close to a water outlet pipe, of the bottom end of a wastewater treatment column is provided with a vortex backflushing mechanism, and water of the water outlet pipe is pumped into the bottom end of the interior of the wastewater treatment column through a water pump in a pressurized mode; due to the fact that the back-flushing flow guide assembly of the vortex back-flushing mechanism is in the shape of a Laval tube, water contracts and then expands, subsonic velocity water flow accelerates in the contraction section and continues to accelerate in the expansion section based on the one-dimensional steady isentropic flow theory, in the back-flushing process, the flow speed of fluid flowing through a porous plate is remarkably increased, and the flow rate of the fluid is increased. And the increase of the flow rate is beneficial to stripping suspended solids deposited on the surface of the filter material, especially dirt and impurities formed on the surface of the perforated plate, and can ensure that the backwashing water flow has enough kinetic energy and impact force so as to more effectively remove the dirt and the impurities.

The utility model relates to the technical field of water purification, in particular to a backwashing ultrafiltration filtering device, which comprises a shell, a first water passing port, a second water passing port and a backwashing port, comprising a cylinder body and an ultrafiltration membrane coated on the cylinder body; a water passing cavity is formed between the outer surface of the ultrafiltration membrane filter cartridge and the interior of the shell; a first electromagnetic valve is arranged at one end of the first water passing pipe; a second electromagnetic valve is arranged at one end of the backwashing water outlet pipe; a fourth electromagnetic valve is arranged at one end of the backwashing pipe; a third electromagnetic valve is arranged at a water inlet of the second water passing pipe; a fifth electromagnetic valve is arranged at a water outlet of the second water passing pipe; and the third water passing pipe is positioned between the backwashing pipe and the fifth electromagnetic valve, so that the backwashing efficiency is improved.

The invention discloses a backwash pre-filter, which relates to the technical field of liquid filtering devices. The technical scheme thereof mainly includes: a joint, a filter cup, a filter element and an opening and closing member, wherein the joint has a water inlet channel and a water outlet channel; the filter cup is connected to the joint and has a raw water cavity, a partition is arranged between the filter cup and the joint, and the partition has a central hole that can connect the water inlet channel with the raw water cavity; a guide groove is arranged in the joint, a conversion hole 1 that can connect the water inlet channel is arranged in the guide groove, the filter element is slidably arranged in the guide groove, the filter element has a clean water cavity that connects the water outlet channel, a conversion hole 2 that can connect the conversion hole 1 is arranged on the side wall of the clean water cavity, and a flange that can seal the central hole is arranged on the outer side of the filter element; a water outlet hole that connects the raw water cavity is arranged at the bottom of the filter cup, and the opening and closing member can block or open the water outlet hole. When the opening and closing member is opened, and the conversion hole 2 is connected to the conversion hole 1, and the flange seals the central hole, the backwash state can be entered, and the cleaning effect is good.

The present application relates to a backwash water and air distribution filter brick and a water and air distribution device for a sulfur autotrophic denitrification filter tank, and relates to the technical field of sewage treatment equipment. The backwash water and air distribution filter brick for the sulfur autotrophic denitrification filter tank in the present application includes a bottom plate, a first side plate, a second side plate and a partition plate, forming a primary distribution chamber for backwash water, a secondary distribution chamber for backwash water and a secondary distribution chamber for backwash air, and realizing uniform water and air distribution through multiple through holes and a secondary particle retention component. The present application also provides a backwash water and air distribution device comprising the above-mentioned backwash water and air distribution filter brick. The structural design in the present application reduces the loss of sulfur autotrophic slow-release materials, reduces the risk of filter brick clogging, improves backwash efficiency, and at the same time reduces the construction depth of the filter tank, saving investment.

The utility model provides a sewage membrane filter device with automatic backwash function relates to sewage treatment equipment technical field, and this device includes filter jar body, the membrane filter subassembly of being immersed in jar body, and water inlet pipeline, water outlet pipeline and sludge discharge pipeline. Its core improvement is integrated with a set of intelligent automatic backwash system, and this system is constituted by backwash water supply pipeline, gas water collaborative flushing unit, parameter detection unit and intelligent control unit. The gas water collaborative flushing unit includes the micropore aerator of being established in the membrane subassembly below jar body bottom, is used for generating tiny air bubble to carry out physical scrubbing to membrane surface, backwash water supply pipeline is connected water outlet pipe, can pump into membrane subassembly water production side with water production reversely. Control unit is based on sensor signal such as transmembrane pressure difference, and the automatic switching and collaborative operation of intelligent control gas washing, water backwash and sludge discharge process, thereby realize efficient, energy -conserving, full -automatic membrane pollution cleaning, significantly prolong the life of membrane and reduce operation maintenance cost.

The utility model relates to sewage treatment equipment, in particular to facultative FFBR energy-saving efficient sewage treatment equipment. According to the facultative FFBR energy-saving efficient sewage treatment equipment, a backwashing mechanism is arranged, a filtering element on a core filtering assembly can be washed and cleaned on line without shutdown of the equipment, it is guaranteed that sewage stably flows through the core filtering assembly in a large-flux mode, the sewage treatment efficiency of the equipment is improved, and energy consumption is effectively reduced. The facultative FFBR energy-saving efficient sewage treatment equipment provided by the utility model comprises a shell used for supporting the equipment; the interior of the shell is sealed and fixedly provided with four partition plates, and the interior of the shell is divided into five cavities by the partition plates, namely an anaerobic tank, a facultative tank, an aerobic tank, a filtering tank and a placing groove. According to the utility model, clear water is conveyed through the backwashing motor to wash the core filter component in work, so that the blockage of a filter opening of a membrane wire on the filter is avoided.

The present application relates to sewage treatment technical field, especially to a kind of biological aerated filter, comprising: pool body, aeration body and filter plate, the filter plate is located in the lower part of pool body, pool body is divided into two parts, the lower part of pool body is pipe gallery, the upper part of pool body is sequentially provided with supporting layer, filter material layer and effluent zone from bottom to top, the aeration body is set in the upper part of filter plate, the upper part of aeration body passes through supporting layer and extends into filter material layer, sewage inlet pipe and backwash inlet pipe are respectively arranged on the side wall of one side of pipe gallery, the effluent outlet is arranged on the side wall of one side of pool body in effluent zone, the present application provides a kind of biological aerated filter, increases the running direction and running path of oxygen, makes filter material and oxygen in multidirectional contact sufficiently, improves the transfer efficiency of oxygen and the utilization rate of filter material, improves the oxidation degradation efficiency to sewage, effectively improves sewage treatment efficiency.

The utility model provides a mobile engineering machinery vehicle hydraulic oil purification device, including the car body and setting on the car body coarse filter, fine filter, vacuum tank, motor oil pump group and electric control cabinet, is provided with walking wheel in the bottom surface four corners of car body, and the oil inlet of coarse filter is connected through the connecting pipe with hydraulic oil tank, is provided with the oil inlet valve on connecting pipe, and the oil outlet of coarse filter is connected with heater through pipeline, and heater, vacuum tank and condenser are connected in proper order through pipeline, and vacuum tank is connected with vacuum pump, and the oil outlet of this vacuum tank is connected with fine filter through pipeline and motor oil pump group, and the oil outlet of fine filter is connected with oil storage jar, and the bottom of condenser is provided with the drain valve, and its top is provided with the condensing pipe, the utility model discloses can filter out the impurity in the hydraulic oil through setting filter on the movable car body, guarantees the filtering effect simultaneously through the cooperation of heater, vacuum tank and condenser to remove the moisture in the hydraulic oil.

The utility model discloses a flat sheet membrane assembly with a plug-in type cluster combination modular structure, which preferably comprises a hollow flat sheet membrane assembly body, an upper connecting piece, a lower connecting piece, a rubber division bar, a groove-shaped plate and an O-shaped sealing ring, a plurality of hollow flat diaphragm assemblies with the same specification are arranged in parallel at intervals along the thickness direction of the hollow flat diaphragm assemblies to form a group, the upper ends of the hollow flat diaphragm assemblies are inserted into holes of the upper connecting piece and are detachably connected in parallel through O-shaped sealing rings, and the lower ends of the hollow flat diaphragm assemblies are embedded into the lower connecting piece through rubber division bars to be detachably connected in parallel; groove-shaped plates are symmetrically embedded in the side faces between the upper connecting piece and the lower connecting piece, and detachable connection is formed, so that a plurality of hollow flat plate membrane assemblies are bundled into an integral combined structure. In a preferred second scheme, except for all the structures in the first scheme, the device further comprises a water collecting box connected to the upper connecting piece. The utility model provides two preferable schemes, so that the installation mode is more flexible, and the adaptability is stronger.

The utility model discloses an integrated water purifier for surface water treatment, which comprises a water purifier, the water purifier comprises a water purification tank, a reactor is arranged on the water purification tank, a filter tank is fixedly arranged in the water purification tank, a honeycomb filler layer is arranged at the top of the filter tank, the filter tank is communicated with the reactor, and an anthracite filter layer and a quartz sand filter layer are arranged at the bottom of the water purification tank. A back flushing pipe is arranged below the quartz sand filter layer, one side of the back flushing pipe is communicated with a water outlet pipe and a driving pipe, the driving pipe is provided with a flow rate adjusting device and a water pump, sewage in the reactor reacts with a flocculating agent and then enters the filter box, and large particles in the sewage enter the filter box under the action of the honeycomb filler layer. Filtered water is further filtered by the quartz sand filter layer and the anthracite filter layer and then is discharged through the backwashing pipe and the water outlet pipe, siphon backwashing is changed into a water pump, backwashing strength is high, backwashing is thorough and clean, and the filter effect is good.

This invention relates to the field of filtration equipment, specifically to a fiber media filter. The tank contains multiple vertically spaced mesh panels, with fiber ball filter media positioned between adjacent mesh panels. A steel wire rope connects adjacent mesh panels. The bottom mesh panel is fixedly installed inside the tank, while the top mesh panel is connected to a drive component for vertical movement. The tank contains a rotating rod driven by a power unit and rotating around its own axis. The rotating rod vertically penetrates the multiple mesh panels. A rotating sleeve is vertically slidably mounted on the rotating rod between adjacent mesh panels, and actuating blades are fixedly mounted on the rotating sleeve. During backwashing of the fiber ball filter media, a first electric push rod retracts, causing the top mesh panel to move upwards. This, in turn, pulls the steel wire rope to widen the spacing between the multiple mesh panels, dispersing the fiber ball filter media between the mesh panels and preventing the multiple layers of fiber ball filter media from accumulating together.

The invention discloses a balanced backwashing mechanism and a system thereof, and belongs to the technical field of filter tank backwashing. The mechanism comprises a balancing sleeve, a liquid inlet pipe is arranged at the top of the balancing sleeve, a liquid distribution cover is arranged in the balancing sleeve, and a liquid inlet groove is formed in the bottom of the liquid distribution cover; a first threaded cylinder is connected below the liquid distribution cover through a fixed cylinder, a first screw rod is in threaded connection in the first threaded cylinder, and a mixing auger is connected to the bottom end of the first screw rod; a sliding plate is rotationally connected among the plurality of mixing augers, and a floating bag is arranged at the bottom of the sliding plate. The water level change is sensed through the floating bag, the mixing auger is driven to rotate, and dynamic mixing and uniform liquid distribution of backwashing water flow are achieved; meanwhile, through cooperation of a second screw rod and the liquid distribution pipe, rotary spraying of the liquid distribution pipe is achieved, and the liquid distribution uniformity is further improved. The backwashing device is compact in structure, good in backwashing effect and capable of effectively prolonging the backwashing interval and saving water.

The present application relates to the technical field of porous metal filtering device, and particularly relates to a metal sintered filter element filtering and separating device intelligent control method and system, which comprises the following steps: obtaining the prominent performance of the plugging degree at each time according to the difference of the pressure difference parameters between adjacent time of the metal sintered filter element filtering and separating device; obtaining the backwashing trigger index at each time according to the prominent performance of the plugging degree and the pressure difference parameters at each time and before each time, so as to determine the trigger time; obtaining the backwashing strength requirement from the backwashing trigger index, the pressure difference parameter and the prominent performance of the plugging degree, so as to output the backwashing control instruction of the trigger time. The present application determines the trigger time in combination with the real-time plugging condition inside the metal sintered filter element filtering and separating device, improves the accuracy and reliability of the backwashing trigger start control, and the backwashing strength requirement of the trigger time is related to the actual state of the trigger time, which can improve the backwashing effect.

The invention discloses equipment and a method for preparing superfine calcium carbonate from fly ash water washing liquid based on a membrane separation technology, relates to the technical field of fly ash water treatment, and aims to solve the technical problem of low treatment efficiency of the fly ash water washing liquid, and the equipment comprises a reaction tank and a membrane separation mechanism. The spiral filter membrane is used for filtering the fly ash water washing liquid, and the movable assembly is arranged to move on the transverse shaft assembly to drive the filter membrane to deform, so that the filter membrane can form a fly ash water washing liquid filtering form in which spiral surfaces are in contact with each other and a spiral backwashing form in which two ends are relatively far away from each other; when suspended matters in the fly ash water washing liquid are filtered, the fly ash water washing liquid enters a reaction tank after being filtered by the membrane separation mechanism in a filtering form, and when backwashing is carried out, filter hole blockages are easily flushed out and are led out through the spiral surface of the filter membrane, so that the backwashing effect is improved, and the treatment efficiency of the fly ash water washing liquid is improved; the technical problem that the treatment efficiency of the fly ash washing liquid is low is solved.

The invention provides a blended fabric active digital printing process which comprises the following steps: S1, fabric preparation: preheating a blended fabric by using an air heater; s2, preparing printing paste, namely pouring raw materials of the printing paste into a beating machine, and uniformly mixing; s3, ink-jet printing is conducted, specifically, the preheated fabric is placed on a printing machine body to be printed; s4, printing spray head cleaning: taking out the printed fabric, controlling the printing spray head to move to a position above a spray head cleaning device, and cleaning and moisturizing the printing spray head; s5, fabric color fixation: taking out the fabric, and putting the fabric into a steam box for steam color fixation; s6, washing the fabric with water; and S7, drying and forming, wherein the washed fabric is put into a drying oven to be dried. Compared with a traditional blended fabric printing process, the printing efficiency of multi-batch fabric printing is improved, the anti-blocking effect of the printing nozzle is remarkably improved, and the printing quality can be guaranteed.

The utility model relates to mine water treatment technical field, concretely relates to a mine water treatment station valveless filter, mainly solves the technical problem that the backwash effect of valveless filter is poor. The valveless filter of this no includes water inlet subassembly, filter assembly, backwash subassembly and blow material subassembly, and filter assembly includes filter box and fresh water tank, and backwash subassembly includes backwash upper water pipe, backwash lower water pipe, backwash auxiliary pipe, exhaust pipe, backwash destruction pipe and drainage sink, and blow material subassembly includes fan, air pipe and cut -off valve. The valveless filter of this no adds blow material subassembly, when backwashing, opens cut -off valve and starts fan, and fan blows into airflow to the filter material in filter box through the air blowing hole of air pipe, and airflow can scatter the impurity such as particle deposited on filter material, and can be discharged with backwash water flow, so as to be able to improve the effect of backwashing greatly, avoid the hardening caused by filter material impurity deposition, guarantee filter material service life.

The utility model relates to the technical field of chemical reaction equipment, and provides a backwashing filter which comprises a filter shell, a filter part and a motor, and in the backflushing mode, the switching valves of the liquid inlet pipe and the liquid outlet pipe are both in a closed state, and the backflushing pipe and the first blow-off pipe are both in an open state. Liquid enters the filter shell from the back-flushing pipe, enters the filter cartridge from the outside of the filter cartridge, and is finally discharged from the first blow-off pipe. Meanwhile, the motor is in a starting state and drives the filter cartridge to rotate around the axis of the liquid inlet pipe, so that the periphery of the filter cartridge passes through the back-flushing pipe by 360 degrees and is effectively flushed, filter residues in the filter cartridge are ensured to turn up and down along with rotation, the flushed filter residues are prevented from depositing at the bottom, and the back-flushing effect is improved. Besides, the backwashing effect is improved by rotating the filter cartridge, structures such as a sweeping rod do not need to be added in the filter cartridge, the occupied space in the filter cartridge is reduced, the abrasion of the filter cartridge is reduced, and the space utilization rate and the service life of the equipment are improved.

The invention discloses a deep bed filter tank overflow and backwashing system and process, and belongs to the technical field of filter tanks. An overflow and backwashing system of a deep-bed filter tank comprises a tank body, a hollow plate in a suspended state is fixedly connected to the bottom of the tank body, a filter material is laid at the upper end of the hollow plate, the overflow and backwashing system further comprises a waste water pipe fixedly connected to the outer wall of the tank body, the waste water pipe is flush with the upper end face of the filter material, and the filter material is arranged on the outer wall of the tank body. An overflow pipe is fixedly connected to the upper end of the tank body; first valves are mounted on the wastewater pipe and the overflow pipe; the strip-shaped plate is transversely mounted at the inner bottom of the tank body in a sliding manner, a strip-shaped water outlet groove is formed in an upper end opening of the strip-shaped plate, and a water inlet pipe is fixedly connected to the outer wall of the tank body; according to the invention, secondary lifting of sewage by using a lifting pump is not needed, the consumption of resources is reduced, and the backwashing effect can be remarkably improved.

The utility model discloses a prefilter capable of being transversely installed, which comprises a water inlet piece with a water inlet, a filter bottle connected with the water inlet piece and a machine head connected with the filter bottle, the machine head is provided with a water outlet and a drain outlet, a lamination framework and laminations are arranged in the filter bottle, the laminations are arranged on the outer side of the lamination framework, the lamination framework is provided with filter water through holes, and the filter water through holes are communicated with the filter bottle. A grating framework is arranged on the inner side of the lamination framework, a guide hole and a backwashing water through hole are formed in the grating framework, a spring mechanism is arranged on the outer side of the grating framework, and the spring mechanism can telescopically move the grating framework to align or stagger the filtering water through hole and the guide hole and close or open the backwashing water through hole. According to the utility model, an extremely good backwashing effect can be formed, the requirement of a user can be met by ultra-large flux, and the effects that water flows in from outside to inside during filtering, has a higher flow speed and can be quickly filtered, and water flows out from inside to outside during backwashing pollution discharge, has higher pressure and can wash particle impurities attached to the lamination can be realized.

The utility model relates to the technical field of ultrafiltration tanks, and discloses a reclaimed water immersion type ultrafiltration tank which comprises an ultrafiltration tank body, the top of one side of the ultrafiltration tank body is communicated with a water inlet pipe, the bottom of one side of the ultrafiltration tank body is communicated with a water outlet pipe, and the interior of the ultrafiltration tank body is fixedly connected with a mounting frame. An ultrafiltration membrane is fixedly connected to the inner side of the mounting frame, an opening and closing plate located at the bottom of the ultrafiltration membrane is fixedly connected to the inner side of the mounting frame, an aeration pipe is arranged between the ultrafiltration membrane and the opening and closing plate, and one end of the aeration pipe penetrates to the outer side of the ultrafiltration tank body and is communicated with an aeration assembly; the inner side of the opening and closing plate is rotationally connected with a closing mechanism, and the problems that when an existing ultrafiltration tank is used, due to the fact that an ultrafiltration membrane is used for filtering impurities in water for a long time, the ultrafiltration membrane is blocked, the filtering performance of the ultrafiltration membrane is affected after the ultrafiltration membrane is blocked, and then the treatment effect of the ultrafiltration membrane is reduced are solved.

This invention relates to a method for preparing a high-purity tubular silicon carbide external coating film. The external coating film is applied to the outside of single-channel or multi-channel tubular silicon carbide supports of various sizes using a negative / positive pressure coating process. The film layer consists of one or two layers. The preparation method of the film layer is as follows: First, silicon carbide powder, silicon source, pH adjuster, dispersant, and solvent are mixed to obtain a uniform and stable slurry with high solids content. Then, using a special negative / positive pressure process, the slurry is uniformly coated onto the outside of the single-channel or multi-channel tubular silicon carbide support. After drying, it has a certain strength. Finally, it is sintered under a protective atmosphere without pressure to obtain a high-purity silicon carbide external coating film that is tightly bonded to the support. This invention innovatively coats a silicon carbide membrane separation layer onto the outer wall of a support body, enabling it to process liquids with no upper limit on solid content. Furthermore, the membrane layer is tightly bonded to the support body, exhibits good erosion resistance, high filtration accuracy, good backwashing effect, and is not prone to clogging. It has broad application prospects in fields such as coal mine wastewater separation, high-viscosity industrial wastewater filtration, recovery of acid solutions containing precious metals, and purification or concentration of high-concentration slurries under harsh working conditions.

The utility model relates to the related technical field of water treatment, in particular to a water treatment all-in-one machine combining laminated filtering and automatic dosing, which comprises an equipment body, and the equipment body comprises an electric cabinet arranged at the top of the inner side of a cabinet body; a treatment assembly is arranged in the cabinet body and comprises a water inlet pipe penetrating through one side of the cabinet body; the laminated filter is arranged in the cabinet body; the backwashing valve is arranged between the water inlet pipe and the laminated filter; the medicine storage box is arranged at the inner bottom of the cabinet body; the suction pumps are symmetrical to the outer side of the water inlet pipe; the connecting pipe is arranged between the pesticide storage box and the suction pump; the blow-off pipe is arranged at the bottom of the backwashing valve and penetrates through the other side of the cabinet body; the water drainage pipe penetrates through the other side of the cabinet body and is located at the bottom of the backwashing valve, a laminated filter and dosing equipment are combined through the treatment assembly, an up-down structure is formed, and occupied space is saved.

The invention relates to the technical field of sewage purification, in particular to sewage purification equipment based on a permeable membrane, which comprises a cylinder body, a filter element and the like, two filter elements which are distributed up and down are arranged in the cylinder body; two water storage spaces which are symmetrical up and down are arranged in the cylinder body, and the two filter elements are respectively positioned in the corresponding water storage spaces. Filtered stream is located in the filter element on the front side and then flows out from the filter element side to the outer side of the filter element under the action of pressure, back washing of the filter element on the front side is achieved, silt on the outer side of the filter element is washed down, and the situation that a large amount of silt adheres to the outer side of the filter element, and consequently filter holes in the filter element are blocked by the silt is avoided; the filtering effect of the filter element is influenced; air in the air bag enters the connecting groove along the air inlet pipe and then enters the inner side of the filter element along the second water outlet pipe, so that the inner side of the filter element is pressurized through airflow, filtered stream flowing into the filter element flows out of the filter element more easily, and the backwashing effect of the filtered stream on the filter element is improved.

The utility model discloses a deep bed denitrification filter which comprises a filter body, a filter bed filled in the filter body and a backwashing pipeline, the filter bed comprises a lower supporting layer, a microbial filler layer positioned above the lower supporting layer, an upper supporting layer positioned above the microbial filler layer and a filter material filling layer positioned above the upper supporting layer; the backwash pipeline comprises a lower-layer backwash pipe laid below the lower supporting layer, an upper-layer backwash pipe laid below the upper supporting layer and a water supply pipe used for conveying backwash water, the water supply pipe is divided into two paths, one path is connected with the lower-layer backwash pipe, and the other path is connected with the upper-layer backwash pipe; and switch valves are mounted on the two water supply pipes. According to the utility model, the backwashing effect can be effectively improved, the backwashing frequency of an area where microorganisms are located is reduced, and the influence of backwashing on microbial populations is reduced.

The utility model discloses a water conservancy riverway trash rack with a back washing function, and particularly relates to the technical field of trash racks, the water conservancy riverway trash rack comprises a bottom plate, a transverse plate located at the top of the bottom plate and a grating plate obliquely arranged between the bottom plate and the transverse plate, a fixing rod is arranged on one side of the grating plate, a through groove is formed in one side of the fixing rod, and the transverse plate is arranged on the bottom plate. A driving threaded rod is rotationally arranged in the through groove, a driving mechanism provides power for the driving threaded rod to rotate, the outer surface of the driving threaded rod is in threaded connection with a threaded hole formed in the middle of a moving block, and two connecting pieces are symmetrically and fixedly connected to one side of the moving block; one sides of the two connecting pieces are jointly and fixedly connected with a flow dividing pipe, a spraying mechanism is arranged on the outer side of the flow dividing pipe, and a water source is provided for the flow dividing pipe through a water supply mechanism. The driving threaded rod and the fixed rod are combined together, so that the spraying mechanism can conveniently move by enough amplitude, and a relatively good backwashing effect is achieved.

The invention discloses a system for sampling and detecting tail gas of a graphite cathode granulation reaction kettle, in the backwashing process of a filtering device, a driving mechanism drives a turntable to rotate between a first station and a second station in a reciprocating manner, when the turntable is located at the first station, each rod piece is located at one end of a corresponding slotted hole, and when the turntable is located at the second station, each rod piece is located at one end of the corresponding slotted hole; when the rotating disc is located at the second station, each rod piece is located at the other end of the corresponding slotted hole, namely, the rod pieces can scrape and sweep back and forth in the slotted holes, so that condensed tar on the hole walls of the slotted holes is scraped and swept down; in addition, due to the fact that the rod piece further extends into the first cavity, the rod piece can continuously stir the adsorption particles in the first cavity when the rotating disc rotates. According to the filter device, the backwashing effect of the filter device is relatively good, and condensed tar in the filter device can be washed away more easily.

This invention relates to the field of filter technology and discloses a pre-filter, which includes a valve body, a housing, a valve core assembly, and a drain valve. The valve body is installed at the top of the housing, and the valve core assembly and the drain valve are both installed inside the housing. The valve body has an inlet end, an outlet end, and filter chambers communicating with the inlet end and the outlet end respectively. A baffle extends downward from the top side of the inner wall of the filter chamber. The valve core assembly includes an inner frame, an impeller, a lower filter screen, a spray gun, a piston body, and an elastic element. The pre-filter provided by this invention solves the problem of large particles of dirt remaining and being difficult to rinse away with a simple drain operation, making it convenient and quick to operate.

The utility model discloses a water and gas distribution filter brick applied to a biological aerated filter. The water and gas distribution filter brick comprises a filter brick main body, a mounting groove is formed in the top of the filter brick main body; a distribution cavity is formed in the filter brick main body; compensation cavities are formed in the two sides of the distribution cavity; first through holes communicated with the compensation cavity are uniformly distributed in the top of the filter brick main body; second through holes communicating with the compensation cavities on the same side are evenly distributed in the two sides of the distribution cavity. The filter brick disclosed by the utility model is simple in structure, convenient to mount, space-saving and good in filtering and backwashing effects.