316results about How to "Improve backwashing effect" patented technology

The invention relates to the technical field of aquiculture water processing and discloses an aquiculture integrated water processing unit, which comprises a hopper-shaped pool body (10); a hole plate (22) is arranged at the upper part of the pool body (10); a filter material (20) for light weight foaming grains is arranged on the lower part of the hole plate (22); a communicating hole (41) and aback-flushing air chamber (40) are arranged at the lower part of the conical surface of the pool body (10); an intake pipe (42) and an exhaust pipe (43) are respectively arranged above the pool body;and a screen (21) is arranged at the lower part of the cylinder of the pool body (10). A flushing method for the aquiculture integrated water processing unit is as follows: a discharge pipe (15) is opened and then is closed; the intake pipe (42) is opened for charging air; the water in the back-flushing air chamber (40) is pressed into the pool body (10); when the back-flushing air chamber (40) is filled with air, the intake pipe (42) is closed and the exhaust pipe (43) is opened instantly; then the air is exhausted and the water in the pool body (10) quickly enters the back-flushing air chamber (40); then the filter material (20) downwards expands and looses; and the intercepted suspension solids and aged biomembrane fall into the water and the filter material (20) is flushed. The filtermaterial has high water processing efficiency, good back-flushing effect and low energy consumption.

A filter compound material (10) comprises a first and second filtration membrane (1, 5) and a drainage material (3) arranged therebetween. The drainage material (3) and the filtration membranes (1, 5) are laminated by means of adhesive nets (2, 4). A flat filter element is made as a blank from the filter compound material and has a geometric shape adapted to the respective use.

The invention relates to the technical field of filtration equipment and provides a pre-pump floating self-cleaning microfiltration device. The pre-pump floating self-cleaning microfiltration device comprises a holder, a center shaft, a filter screen cylinder, annular end covers and a cleaning pipe, wherein the center shaft is mounted on the holder; the filter screen cylinder sleeves the center shaft correspondingly to a position between the left and right ends of the center shaft; the annular end covers with inner holes sleeving the center shaft are fixedly mounted on the left and right ends of the filter screen cylinder, respectively; the center shaft comprises a cleaning section and a water outlet section; the right end of the cleaning section is fixed with the left end of the water outlet section. The pre-pump floating self-cleaning microfiltration device is reasonable and compact in structure; the center shaft is added to improve the transmission stability of the filter screen cylinder; the cleaning pipe is added to integrate filtration and back washing, and the back washing can be completed at the same time of filtration; the filtration efficiency is high, the back washing is thorough and the blockage is avoided; the filter screen cylinder is flushed continuously to ensure the stability of the filtration efficiency of the filter screen cylinder, the special back washing by virtue of intermittent filtration operation is avoided, and the filtration efficiency can be improved.

The invention discloses a multi-filter cylinder automatic backwashing filter apparatus. A housing is divided into an upper chamber and a lower chamber by a separation plate. The separation plate is provided with filter cylinders in the manner of one, two, or multiple concentric circles. The sidewall of the housing under the separation plate is provided with a sewage inlet, and the sidewall of the housing above the separation plate is provided with a pure water outlet. A motor of a backwashing mechanism drives a main shaft to rotate. A lifting mechanism drives the main shaft to go up and down. A multi-way connection seat connects the main shaft, rotating arms and a waste pipe together. The main shaft drives the rotating arms to lift and rotate. The waste pipe is fixed. Suction nozzles fixed on the upper end port of the rotating arms can be in sealed connection with water inlets on the separation plate. The end part of the waste pipe is connected with an electric drain valve or a pneumatic drain valve. A control system controls the actions of the motor, the lifting mechanism and the electric drain valve or the pneumatic drain valve. The filter apparatus has the advantages of small size, large amount of water filtration, high production efficiency, good filtration effect of filtered water, good backwashing effect, low frequency of backwashing, long-life apparatus, low maintenance rate, and saving backwash water.

The invention discloses a sewage aerobic land treatment system. The system comprises a groove body formed by digging under the ground, wherein impermeable membranes are laid at the periphery and at the bottom of the groove body; and a sand layer, a water distribution layer, a packing and water collecting layer and a soil layer are formed in turn from bottom to top. The sewage aerobic land treatment system is characterized by also comprising a blast aeration system consisting of a blast blower, an air diffusion device and a connecting pipeline, wherein the air diffusion device is positioned below the water surface of the land treatment system and connected with the blast blower through a pipeline; pretreated sewage enters the land treatment system; and air is pressurized by the blast blower and diffused into sewage of the system in the form of small air bubbles through the air diffusion device. Therefore, the aims of charging oxygen into the sewage and stirring are fulfilled, good reoxygenation effect, high mass transfer efficiency, quick bio-membrane updating and high treatment efficiency are achieved, and the problem of blockage of the land treatment system in the operating process is solved effectively.

The invention discloses a deep processing method of urban recycled water by using it as industrial cycling cooling water comprising the steps of, the urban recycled water being collected and entering the recycled water pool, then entering pressure type mixer, entering into clarification tank, liming by wet method for softening, condensation, settlement and automatic de-sludging, the output water flowing into the circular double chamber filter, then entering clean water tank through pressure type mixer, the clean water being pumped to the cycling water pump discharge pressure tube after the compensator to be used for re-circulated cooling water system.

The invention discloses a double-way backwashing pressure filter tank and a backwashing method thereof. The double-way backwashing pressure filter tank comprises a tank body (1), a stirrer (2) and a filter bed (3), wherein the stirrer is vertically arranged at the center of the tank body; a water inlet (4) and a water outlet (5) are arranged on the tank body; sieve pipes (14 and 14a) are arrangedon both of the water inlet (4) and the water outlet (5); the tank body is connected with an overflow pipe (7) and an exhaust pipe (8); the filter bed is mounted in the tank body; the water inlet is connected with a filtering water inlet pipe (10) and a backwashing draining pipe (11); the water outlet is connected with a filtering water outlet pipe (12) and a backwashing water inlet pipe (13); valves (15, 15a, 15c, 15d, 15e and 15f) are arranged on the overflow pipe, the exhaust pipe, the filtering water inlet pipe, the backwashing draining pipe, the filtering water outlet pipe and the backwashing water inlet pipe respectively; a sewage draining outlet (6) is formed at the upper part of the tank body; the sewage draining outlet (6) is connected with a sewage draining pipe (9); and a valve (15b) is arranged on the sewage draining pipe (9). The double-way backwashing pressure filter tank can be used for solving the problems that the filter backwashing is incomplete and the sieve pipes are easily blocked.

The invention discloses a fully-automatic back-flushing type self-cleaning filter. An inner cavity of a barrel body is divided into an upper cavity, a middle cavity and a lower cavity by an upper separating plate and a lower separating plate. In the middle cavity, two ends of a middle diversion pipe are respectively connected with big ladder center holes in the upper separating plate and the lower separating plate in sealed mode, and two ends of each of eight thin cylinder filter screens are respectively connected with eight small ladder holes in the upper separating plate and the lower separating plate in sealed mode. A middle blow-off pipe is sleeved in the middle diversion pipe in non-contact mode. An upper rotary arm is arranged in the upper cavity, and a lower rotary arm is arranged in the lower cavity. The upper rotary arm and the lower rotary arm are respectively composed of a four-way connector, two elbow pipes which are symmetrically connected with the left end and the right end of the four-way connector, and sealing covers connected with lower end faces of the elbow pipes. The upper end of the middle blow-off pipe is connected with the lower end of the four-way connector of the upper rotary arm, and the lower end of the middle blow-off pipe is connected with the upper end of the four-way connector of the lower rotary arm. The spacing between the two sealing covers on the same rotary arm is equal to the diameter of a circumference where the eight small ladder holes are located. The upper end of the four-way connector of the upper rotary arm is fixedly connected with a rotary arm drive shaft driven by a stepping motor. The thin cylinder filter screens are back-flushed automatically so that the back-flushing effect is good.

The invention relates to a multi-effect double-medium filter; an inner primary filtering cylinder of the multi-effect double-medium filter is arranged in a filter shell; water inlet pipelines are symmetrically arranged at two sides of the inner primary filtering cylinder; a filter net is arranged in the inner primary filtering cylinder; the interior of a hollow shaft is divided into two independent cavities; one cavity is communicated with a backwashing buffer short section and a backwashing spray pipe; the other cavity is communicated with a residue-removing buffer short section and a residue absorbing pipe; the backwashing spray pipe and the residue absorbing pipe are in the inner primary filtering cylinder; the backwashing buffer short section and the residue-removing buffer short section sleeve the hollow shaft; a pollutant absorption motor is arranged on the top of the hollow shaft and connected with the hollow shaft so as to drive the hollow shaft; a light filter material layer and a heavy filter material layer are paved in the filter shell from top to bottom; and a ring-current backwashing structure is arranged in the light filter material layer and connected to a back-cleaning main pipe. The multi-effect double-medium filter disclosed by the invention has the advantages that the filtering effect is good; the filter material backwashing effect is good; filter materials are difficult to flow away and crush; and the multi-effect double-medium filter is convenient to maintain, etc.

The invention discloses an air-entrapping flusher of a micro-irrigation sandstone filter, comprising a filtering tank and a sandstone filter material filled in the filtering tank. A clapboard of a header tank is arranged below the sandstone filter material at the bottom of the filtering tank. A filter cap is arranged on the clapboard of the header tank and two air washing rings are arranged in the periphery and the middle of the filter cap. Air holes are evenly distributed at the up direction of the air washing rings in an interlaced way. The two air washing rings are connected with an air inlet pipe that runs through upwards along the inner wall of a tank body from a sand feeding port in a seal way and is communicated with an air compressor. The invention utilizes the combined action of water and air to cause a whole filter material layer in the tank body to produce the strong stirring, which can effectively wash impurities adhering to the sandstone cleanly with the action of impact of air and water flow and friction force caused by the collision of sandstones. With convenient operation and good backwashing effect, the invention saves the cleaning water used for washing.

The invention discloses a washing machine self-cleaning circulating filtering system and a self-cleaning method. The system comprises a water storage tank communicated with a washing machine, a filter module disposed in the water storage tank and processing water and a siphon pipeline communicated with the water storage tank, wherein the internal space of the water storage tank is divided into two cavities; the two cavities are communicated via the filter module; the two cavities are a first cavity to filter drainage water in a washing machine water accommodating barrel, and a second cavity discharging the filtered water to the water accommodating barrel; one end of the siphon pipeline is communicated with the first cavity and the other end lifts, then passes through a washing machine body and then descends; a highest point of the siphon pipeline is higher than a height between a water outlet position of the water storage tank and a circulating water inlet position of the water accommodating barrel; when the filter module is blocked, large absorption force is formed in the siphon pipeline due to the siphon principle, so block can be automatically cleaned and back wash can be formed; after cleaning is finished, the siphon is automatically destroyed and circulating water is continued; and the washing machine self-cleaning circulating filtering system is simply structured, requires low cost, and hand-operated block cleaning work via circulating water program stop can be avoided.

The invention discloses a system for recycling a wastewater from circulating cooling water by adopting a membrane process. The system comprises water treatment processes such as alkaline joint softening, ozone-biological active carbon, ultra-filtration, reverse osmosis and electrodialysis. Aiming at the water quality characteristics of the wastewater from circulating cooling water in a heat-engine plant, the process comprises the following steps: firstly, carrying out pretreatment on raw water by adopting the processes such as alkaline joint softening and ozone-biological active carbon treatment, and then adopting an ultra-filtration and reverse osmosis double-membrane treatment technology; entering reverse osmosis drainage into an electrodialysis device to concentrate; carrying out curing treatment on a little of electrodialysis strong brine. The alkaline joint softening and ozone-biological active carbon pretreatment technologies are adopted, so that the content of scaling components and refractory organics in water can be effectively reduced; the maximal reduction of wastewater with high salt content at the tail end is achieved by electrodialysis concentration. Therefore, the system has the characteristics of good operation stability, low pollution plugging of a reverse osmosis membrane, high overall recovery rate and the like.

The present invention relates to a long cellosilk high-speed filter by using long staple as filter material mainly includes filter tube body, long cellosilk high-speed filtering component, embedded flange connecting device, coupled multiring perforated tube gas distributor, shaft symmetrical water distributor whose centre is used for intaking water and periphery is used for discharging water and grid gas-water separator, in which in the filter tube body the long cellosilk high-speed filtering component is placed, the lower portion of the long-cellosilk high-speed filtering component is equipped with gas distributor, the backflush air intake tube is directly communicated with gas distributor, and the bottom of the lower cylinder body is equipped with filter effluent and backflush water intake tube.

The invention discloses an anti-blocking water distribution and back-flushing method and device for a constructed wetland. Water distribution pipes are arranged in layers on the surface layer of the constructed wetland and inside filler and connected with an incoming water source through valves respectively; the water distribution pipe in the filler is connected with an air pipe through an intermediate pipe; and the top of the air pipe is communicated with the atmosphere. When the device runs in the wetland, constant water distribution is realized layer by layer from top to bottom by controlling the on / off of the valves, and the yielding water is collected and discharged by a water-out pipe at the bottom of the wetland; and in back flushing, the water-out and distribution pipes are used as back-flushing layered water feed and collection pipes. The parameters such as back-flushing strength and back-flushing time are set according to the actual blocking degree of each layer of the wetland, and the back-flushing water is discharged nearby; the phenomenon that the filler close to the water distribution positions is easily blocked together in the constructed wetland can be effectively solved, the filler of each layer is fully utilized, and the service life is prolonged; due to the back-flushing way, the back-flushing efficiency is improved, the distribution of back-flushing water is optimized, and the operation is simple; and since an additional back-flushing pipe is not needed, the cost is lowered.

The invention provides a biological aerated filter. According to the biological aerated filter, a filter material layer, a supporting plate and a filter brick layer are sequentially arranged in a filter body, wherein filter materials are arranged on the filter material layer; the supporting plate is used for supporting the filter materials in the filter material layer; the supporting plate is adjacent to the filter material layer; the filter brick layer is used for distributing water and air, consists of multiple tiled filter bricks and is adjacent to the supporting plate. In addition, the invention also provides a method for constructing the biological aerated filter.

The invention relates to an improved gas-water mixed backwash structure of an aeration biological filter chamber. The clear water in a clear water pool (8) is pumped out by a pressurizing water pump (12) and is led to the bottom of a chamber body (1) through a water distributing pipe net (13), then the clear water passes through a filter material (7) from bottom to top so as to take filter residue (15); then the water enters into a backwash water collecting groove (4) through a sieve (17); the sewage flows to a sewage pool (9) through a water drainage pipeline (6); the upward side of the backwash water collecting groove (4) is provided with a through length supporting lever (16); the sieve (17) encases the backwash water collecting groove (4) and the supporting lever (16) so as to ensure that the filter bed restores the function of filtering and purifying the sewage, prolongs the backwash period and reduces the backwash frequency, as well as ensure that the sewage purifying system canbe better and normally operated; the sieve has simple mounting and dismounting, less material consumption and convenient maintenance.

A filter which is used to remove chips and sludge produced by the processing using a machine tool is backwashed. At this time, a valve provided in an outlet of a filter container is opened based on an elapse time from the start of the supply of compressed air or a cutting fluid to the filter container or a detection value of a pressure inside the filter container. In this way, the supply pressure of the cutting fluid or the compressed air is sufficiently applied to the filter, so that chips adhering to a surface of the filter are sufficiently removed.

The invention belongs to sewage treatment equipment, and specifically relates to an improved backwashing device for a biofilter and an application of the backwashing device in backwashing of the biofilter. The backwashing device comprises the biofilter which is provided with a buffer water-distribution zone, a filtering plate, a supporting layer, a filtering material layer and a clear water zone,wherein the input ends of a backwashing air inlet pipeline, a water inlet pipeline and a backwashing water inlet pipeline are separately connected with the buffer water distribution zone; the backwashing water outlet located in the clear water zone is connected with a water discharge pipeline; a turbidity detector is arranged in the clear water zone; the turbidity detector and pumping units and control valves arranged in an air inlet pipeline, the backwashing air inlet pipeline, the water inlet pipeline, the water discharge pipeline, the backwashing water inlet pipeline and a backwashing waterdischarge pipeline are electrically connected with a control device; the backwashing water outlet of the biofilter is provided with a filtering net; a water inlet pressure sensor is arranged on the water inlet pipeline; and the signal output end of the water inlet pressure sensor is connected with the control device. The improved backwashing device provided by the invention effectively solves theproblem of unstable backwashing effect in the prior art, and has the advantages of significantly-reduced energy consumption, small equipment and civil engineering investment, etc.

The invention provides a helical flow dephosphorization reactor. The helical flow dephosphorization reactor comprises a pre-backwashing zone, a gas stripping lifting zone, a water discharging zone, a filtering zone, a water feeding zone, a backwashing zone and a solid-liquid separation zone from bottom to top; the pre-backwashing zone comprises an inverted bench body, and an escape tube is arranged below the inverted bench body; the gas stripping lifting zone comprises a gas stripping tube, and the lower end of the gas stripping tube is provided with a gas stripping gas inlet tube; the water discharging zone comprises a filtered water collecting tube, and the filtered water collecting tube is coaxially arranged outside the gas stripping tube; the filtering zone comprises a lower cylinder, and the lower cylinder is coaxially arranged outside the filtered water collecting tube; the water feeding zone comprises a water feeding tube, and the water feeding tube is connected with the upper end of the lower cylinder; the backwashing zone comprises a backwashing air tube, the backwashing air tube is connected with the upper end of the gas stripping tube, and an efficient stripping tube is connected with the top of the gas stripping tube; and the solid-liquid separation zone comprises an upper cylinder, and the upper cylinder is connected with the top of the lower cylinder. The reactor has the advantages of continuous running, tending towards a laminar flow state, small dead zone area, high filtering and backwashing efficiency, reasonable and concise structure, convenient processing and convenient popularization application.

The invention belongs to the field of water treatment filter equipment, and in particular relates to a high-precision cyclone separation filter. The high-precision cyclone separation filter comprises a cylinder, wherein an upper-end pressure plate and a lower-end pressure plate are arranged in the cylinder body; a filter material is filled between the upper-end pressure plate and the lower-end pressure plate; a hollow screw rod penetrates through a space between the upper-end pressure plate and the lower-end pressure plate; threaded sleeves are arranged at the two ends of the screw rod; the upper-end pressure plate and the lower-end pressure plate are respectively connected with the screw rod through the threaded sleeves; a flow division plate is arranged below the lower-end pressure plate and is arranged on the threaded sleeve which is connected with the lower-end pressure plate, in a sleeving manner; tangent water passage holes are respectively distributed in the upper part and the lower part of the screw rod; a water inlet cyclone device and a sedimentation screen plate are arranged on the bottom of the cylinder body; a backwash water outlet is formed in the top of the cylinder body; the top of the screw rod is connected with a motor; the middle part of the screw rod is connected with a water collecting device; the water collecting device is connected with a water outlet through a water delivery pipe; the water outlet is formed in one side of the cylinder body; a manhole is formed in the other side of the cylinder body. According to the high-precision cyclone separation filter, a backwash pump is not arranged, the number of combination tanks is not required, the high-precision cyclone separation filter can be adjusted and compressed, the filter area is large, the treatment precision is high, the water treatment amount is large, and the occupied area is small.

The invention discloses an environment-friendly energy-saving fresh air dust removing system and a treatment method, and relates to the energy saving and environmental protection fields. The system comprises a reclaimed water treatment tower and an air purification device. The whole filtering and washing processes are controlled automatically through a programmable logic controller (PLC) control system, the degree of automation in the treatment process is greatly improved, addition of chemical cleaning agents and the existing manual cleaning mode are changed, possibility of secondary pollution is avoided, treated water is used for dust removal by ventilation for air in some special occasions such as underground passages, underground garages, basements of large buildings and subways, recycling of water is achieved, surplus water can be used for usage of surrounding waterscapes and cleaning.

The invention relates to an automatic vertical back-washing device. The device comprises a cylinder which is provided with a water inlet, a water outlet and a drainage port, and a filter screen is arranged in the cylinder. The device is characterized by vertical design, and the water inlet is arranged at the lower part of the cylinder wall and is provided with an inlet valve; the water outlet is arranged at the upper part of the cylinder wall and is provided with an outlet valve; the drainage port is arranged at the lower part of the other side of the cylinder opposite to the water inlet, and is provided with a drainage valve; the cylinder is hermetically equipped with a cylinder cover, the center of the cylinder cover is provided with a back-washing port and a back-washing port valve; the filter screen is a detachable double-layer compound filter screen, non-woven fabrics are filled between the double-layer filter screen, the bottom edge of the compound filter screen is fixed at the bottom of the cylinder, and the top end position of the compound filter screen is higher than the water outlet; and a movable separator is arranged at the position of the water inlet in the cylinder, and the movable separator is a hinge structure; a fixing hinge of the movable separator is fixedly arranged at the bottom of the cylinder, and is connected with a movable hinge by a hinge connection pin.

Belonging to the field of environmental protection equipment, the invention relates to a full-automatic efficient fiber bundle valveless filter. According to the invention, a fiber bundle filter material is used in the valveless filter, and a gas water mixture is adopted for backwashing; a supporting layer composed of a rigid particulate filter material is added below the fiber bundle filter material; and a gas distributing device is arranged between the fiber bundle filter material and the supporting layer. The upper part of a siphon downcomer is provided with a pressure power switch. When water in a siphon riser pipe overflows from the siphon top and flows downward in the siphon downcomer, the water pressure makes the pressure power switch turned on, an electrically operated valve is opened, and compressed air enters a backwashing water flow through the gas distributing device. When the backwashing is over, water in the siphon downcomer descends to a normal water level, and after removal of the water pressure, the pressure power switch reset and outage occurs, the electrically operated valve is closed, and the filter starts to work again. The invention provides the efficient full-automatic fiber bundle valveless filter, the filtration effect and backwashing effect are enhanced, and the effluent water quality is improved.

The invention discloses a novel underground coal mine water filter provided with adjustable filter boards, and a filtering method. The novel underground coal mine water filter comprises a filter housing, an explosion-proof electric machine, a bevel gear transmission mechanism, a filter raw water input, a backwashing water outlet, a filtered water outlet and a support. Characteristics are that: an upper movable filter plate, a lower movable filter plate, a fixed filter board, a filter board elevating mechanism, a guiding device and filter materials are arranged in the filter housing; a screen mesh with a pore size less than the partical size of the filter materials is welded on the upper surface of the upper movable filter board; the lower movable filter board is a filter board with a larger pore size; a filter cap is arranged on the fixed filter board; the filter materials are placed between the upper movable filter board and the fixed filter board; the filter raw water inlet is connected to a water deliver pump; the backwashing water outlet is connected to a sewage tank; and the filter board elevating mechanism is driven by the explosion-proof electric machine through the bevel gear transmission mechanism, so that the movable filter boards are capable of realizing reciprocating movement upwards and downwards. Advantages are that: backwashing effects are excellent, filter material loss in backwashing is avoided effectively, and the novel underground coal mine water filter is capable of realizing automatic backwashing.

The invention belongs to the technical field of water treatment and relates to a swimming pool water filtration device. The swimming pool water filtration device comprises a water inlet pump, a housing, filter sheets, a rotation sludge-discharge device, a water distribution system, a water collection system and other accessories. The swimming pool water filtration device utilizes a light nontoxic extension-type ordered braided fabric as a filter material. The filter sheets have shrink ring-type cylinder structures. The swimming pool water filtration device utilizes a rotation line-type sweep washing method to carry out backwashing. The swimming pool water filtration device has the advantages of large effective filtration area, no storage of washing water, good product water quality, large filtration flow amount, small pressure-type loss, low power consumption, no daily concierge management, and assembling-disassembling and maintenance convenience. The swimming pool water filtration device can be widely used for treatment on water and other fluids, and especially for recycle of swimming pool water, purification of recirculated cooling water, treatment on agricultural irrigation water, and detection and treatment on low-turbidity high-quality raw water.

The invention relates to a novel P-typed fully automatic filter, which is an online novel P-typed filter carrying out a filter net backwashing by effectively adopting the self pressure of pipelines. The filter net has the bidirectional opening and is divided into a multi-chamber by a retaining plate; the backwashing of the filter net multi-chamber is carried out one by one; the backwashing is thorough without dead angles and with good effect, and the water supply is continuous when the backwashing is carried out. The novel P-typed fully automatic filter has two types: one that the water inlet and the water outlet are directly communicated and the other one that the water inlet and the water outlet are straight angles. The invention has the advantages of simple structure, sound design, convenient manufacture, low cost, and is the updating regeneration products of the traditional P-typed filters.

The invention relates to a method and a device thereof for treating cascade adsorbed water by radiating lateral and vertical flows. In the method, two-stage absorption and filtering are implemented by adopting a closed pressure type device, wherein the first stage adopts a radiation type lateral flow water inlet mode, and the filtering speed of a filter chamber of the lateral flow is reduced gradually along the radius direction; and the second stage adopts a pressure flow vertical water inlet mode from top to bottom, and the filtered water is discharged via a pipeline. The filter materials are red mud-based environmental rehabilitation materials, and the filter layer of each stage of filter chamber is in a homogeneous structure. The filter function of the filter layers is kept through a back washing mode, and the back washing water washes the filter layers from top to bottom and then flows out via pipelines. The device mainly comprises a filter system and a back washing system. The invention not only solves the problem of uneven capacity of the pollutant removal and enhances the treatment effect, but also enhances the back washing effect by adopting a back washing mode from top to bottom and a lateral back washing mode. Compared with the traditional physicochemical-biochemical technique, the method and device of the invention have obvious purification effect.

The invention provides a gravel bed structure and an in-situ purification system of riverway water formed thereby. The gravel bed structure and the in-situ purification system of riverway water formed thereby have following beneficial effects: firstly, the gravel bed structure is disposed on a river bottom without occupying additional soil area and changing external appearance of an embankment; secondly, the overall system is flexible and changeable in such a manner that the overflow amount and processing amount of a river can be controlled by a flap regulating dam so that in flood seasons, the flap regulating dam can be completely opened for allowing river water to surmount and reponses are made based on variation in flow amount of riverway water; thirdly, back flushing operation can be realized by closing a water intake gate and completely opening the flap dam while by fully utilizing the terrain slope in association with a sludge pump, fine sludge discharge and back flushing effects are obtained; finally, productization equipment are adopted by the flap dam and the water inlet gate so that the whole set of system is easy to automatically control and helps to save manual cost during operation and is convenient to manage and maintain.

The invention provides a course TiCl4 filtering method, using TiAl intermetalic compound tubular filter membrane as filtering component, and the filtering course mainly comprises two steps of course TiCl4 filtering and regularly stripping, controlling the pressure range of course TiCl4 filtering at 0.10-0.20MPa, filtering course TiCl4 liquid flow through a filtering device with the TiAl intermetalic compound filter membrane so as to obtain high-grade filtrate, , stopping filtering after 30-90 min, stripping with stripping agent to remove suspended solid accumulated on the membrane, discharging the obtained entrapped matters into a densifier for settlement separation and after the stripping ends, resuming filtering, where the stripping pressure is higher than the filtering pressure and the stripping time is 5-30 s, the stripping can use TiCl4 filtrate as stripping agent, dry air, nitrogen gas, or argon gas as stripping agent, and the gas-liquid mixture of TiCl4 filtrate and dry air (nitrogen gas, or argon gas) as stripping agent.