99results about How to "Extend the filter cycle" patented technology

The invention relates to the improvement of a method for treating polymer-containing sewage of an oil field. The method is characterized in that microorganisms are formed by mixing bacillus cereuses, bacillus megateria, bacillus subtilis, candida lipolytica, bacillus brevis and pseudomonas fluorescens; after microorganism aerobic degradation, post filter treatment is carried out; obligate microorganisms are used for degrading oil and organic pollutants bonded on polymers, thereby improving the separability of surplus inorganic substances and polymer-containing substances; and meanwhile, the degradation of the oil and the organic pollutants creates a condition for subsequently prolonging the filter period of a filter material. The invention has the advantages of simple process, simplified flows, convenient running and management, good treatment effect, low treatment and running cost (0.65-0.7yuen / ton of water, which is 2 / 3 of that of conventional treatment), no need of adding any drug,no treatment secondary pollution and stable treatment effect, can guarantee that treated yield water can stably reach 5.5.2, has small sludge quantity and does not need a sludge treatment system, thereby solving the treatment problem of polymer-containing sewage of an oil field.

The invention relates to a method and a device for retarding membrane pollution in membrane water treatment. A shell with a membrane component is filled with a certain quantity of active carbon particles with certain particle size. In order to ensure the effect, the shell needs to be vertically installed; the volume of the active carbon particles accounts for about 30%-60% of that of a gap of the shell; the active carbon particles are fluidized in the shell of the membrane component through power of a circulating pump; the membrane surface is scrubbed continuously, so that pollutants are prevented from forming a filter cake layer on the membrane surface; the resistance of a filter cake layer of the membrane is retarded; dissolved organic matters in water are partially adsorbed by virtue of the adsorption capacity of the active carbon particles; blockage for membrane pores is retarded; and the blocking resistance of the membrane pores is retarded. The device comprises a filter shell and the membrane component; the shell is filled with a certain quantity of active carbon particles; a circulating pump is arranged on the shell and used for providing power for fluidization of the active carbon particles, so that the membrane surface is effectively scrubbed, the filter cycle of the membrane is prolonged and the operation cost is lowered further.

The invention discloses a method of double-deck making water filter device and modified filtering material, wherein the double-deck making water filter device contains water disposal reactor (1) and filtering material (2) in the water disposal reactor (1); the modified filtering material is made of modified agent on the quartz sand or ceramicite. The method comprises the following steps: mixing one kind or more of ferric nitrate, aluminum chloride and manganese chloride salt solution; adding NaOH to prepare the modified filtering material; or mixing one or more of Fe2O3, Al2O3 and neo-ecological manganese dioxide powder; adding carrier to stir or oscillate to prepare the modified filtering material. The invention can remove impurity, organics and heavy metal in the water, which reduces the cost.

The invention discloses a recycling method of circulated cooling water of industrial wastewater with carbinol, which comprises the following steps: adopting hydrolytic adjusting pond; proceeding microbe contacting to oxidize; proceeding aerobic biological contact to oxidize; concreting; sedimenting; filtering through active charcoal; sterilizing through UV; adopting elastic cubic fill and microhole aerating system as fill of biological contact oxidizing course; decomposing organism with DO under 0.5-1. 0mg / l; removing CODcr, suspension and organism effectively.

The invention discloses an integrated reuse equipment for bathing waste water treatment in hotel and the method. The equipment comprises tube mixer, metering pump, hair filter, drug groove, fiber ball filter, ultra-filtration membrane module, ClO2 disinfection groove, storage vessel, security filter core and pressure pump. Bathing waste water generated in hotel is collected and filtered by new micro-flocculation fiber of polyester high elastic yarn. After outputting water achieves the demand of <<water quality of urban miscellaneous water reused in city>> (GB / T 18920-2002), it can return in hotel to flushing in toilet, greening and so on. Residual ultra-filtration outputting water is carried with disinfection treatment by nanometer filter film device and. After outputting water achieves the demand of <<health standard of living and drinking water>> (GB5749-85), it can return in hotel for washing, bathing and so on where the water quality is demanded higher. The process and relative equipment is provided with simple flow, easy operation and management. It is very suitable for reclaimed water reuse in hotel.

The invention discloses a novel graded gas filtering device and belongs to the technical fields of medical equipment and health care. The novel graded gas filtering device comprises a shell part and a filtering part; the shell part comprises an upper cover and a lower shell. The upper shell and the lower shell are in firm and sealed connection; the filtering part is used for filtering by grades according to the sizes of object particles in gas and is mounted and fixed on a convex ring of the upper cover. The upper cover is mainly combined with the filtering part, so that the aim of fixing components of the filtering part is realized, and the filtering part and the upper cover have very good firmness and sealing property after being mounted; the shell part is mainly used for protecting the filtering part and risk of damaging the filtering part is avoided. The novel graded gas filtering device disclosed by the invention can be used for filtering gas discharged in a laparoscopic surgery and a surgery environment of a medical establishment is effectively protected from pollution, so that the physical and psychological health of medical personnel and patients is guaranteed; meanwhile, the novel graded gas filtering device has the advantages of simple structure, convenience for operation, high gas filtering efficiency, safety and cleanliness and the like.

The invention relates to a segregating unit, which is a filter with a rotatable fibre strainer, comprising water inlet / water outlet, air inlet / air outlet and water distribution / water out unit mounted on the tank, air distributing device mounted in the tank, and fibre strainer connected fixedly with the fixed pore plate and moving pore plate and mounted between thereof in the tank. The method is characterized in that: a support guide tube is mounted at the center of the tank and two ends thereof are securely connected with the water distribution / water out unit, a conduit which hitches on the support guide tube and is a helical pair therewith, the moving pore plate which is securely connected with the round plate is securely connected with the conduit, and rotatable fibre strainer composed of plurality of swirl vanes is mounted between the conduit and the round plate. The device has a simple structure, operates and maintains conveniently, and easily realizes large-scale equipment. The device has an advantage of a high filtrating precision, a big area, a large pollution-cutting capability, a long filtrating cycle, a big water-making, a excellent filtrating quality, a and reliable property.

The invention relates to an efficient low-resistance spunbonded nonwoven filter material which comprises at least four rows of silks, including first to fourth rows of silks, sequentially arranged from top to bottom, wherein the first row of silks has a rough filtration function, and the fineness is 2.5-3.5dtex; the second row of silks has a fine filtration function, and the fineness is 0.5-1.5dtex; the third row of silks has the effect of a framework and a stiffening function, and the fineness is 10-15dtex; the fourth row of silks has a ventilating function and a good adhesive effect, and the fineness is 5-7dtex. The finenesses of all rows of silks in the non-woven fabric are agilely adjusted, so that the filter material is high in air permeability, small in filter resistance and long in filter period while achieving high filter efficiency. Compared with conventional spunbonded nonwoven filter materials, the efficient low-resistance spunbonded nonwoven filter material has the advantages that the finenesses of the layers of the product are different, so that the filter material has a good gradient filter effect. The filter material is excellent in air permeability, small in filter resistance and long in filter period while achieving good filter efficiency.

The invention which belongs to the technical field of drinking water treatment especially relates to a method for reinforcing the coacervation algae removal and controlling the release of intracellular substances in the process of high algae water treatment. The invention which aims at the eutrophication pollution of surface water sources of lakes, reservoirs and the like provides a method for improving the algae cell removal effect of technologies of coagulation, deposition and filtration of a water work with the combined action of potassium permanganate and a ferric salt, wherein the appropriate oxidation effect of potassium permanganate inactivates and inhibits the activity of algae cells and controls the release of intracellular metabolites, and In situ MnO2 which is in situ generatedthrough a reduction reaction of potassium permanganate deposits on the surface of the algae cells to improve the settlement performance of the algae cells; and the electrical neutralization of the ferric salt allows the potential of the surface of the algae cells to be improved, and In situ Fe(OH)3 which is in situ generated through a hydrolysis reaction of the ferric salt deposits on the surfaceof the algae cells to improve the potential and the settlement performance of the surface of the algae cells. The method of the invention which is mainly applied to the purification in the drinking water work can also be applied to landscape water treatment which aims at the landscape water reuse and the water source pretreatment of the eutrophication water to inhibit the growth of the algae cells.

A processing system and a processing method for purifying a sewerage sludge filtrate includes (1) airing and precipitating the filtrate in a sedimentation basin; (2) conveying the filtrate after the precipitation to an air stripping tower to remove the ammonia nitrogen; (3) conveying the filtrate from the air stripping tower to a balancing tank to regulate a pH value; (4) conveying the filtrate to a sequencing batch activated sludge reaction tank to implement an aerobic microbial treatment firstly and an anaerobic microorganism treatment secondly; (5) filtering, absorbing and purifying the filtrate by a haydite filter pot discharged from a draining device; (6) implementing a film treatment to the filtrate after the filtration of the haydite filter pot by a hollow hyperfiltration device. The advantage of the invention is that the filtrate may reach a firstlevel B standard of the sewage discharge standard > after the above technical scheme, and the system has a high efficiency.

This invention relates to an adsorption-refinery agent for solvent refinery of base oil for lubricating oil. The adsorption-refinery agent is mainly composed of porous substances such as aluminum oxide and silicon oxide, and has a network skeleton crystal structure (an Al- octahedron layer sandwiched in two Si-O tetrahedron layers), and a defect structure caused by solvent modification. The adsorption-refinery agent, when used after refinery and denitrogenation of base oil, can effectively remove residual nitrogen in base oil, thus can increase the oil yield and filtration efficiency, and lower the filtration temperature.

The invention discloses a butterfly high-efficiency self-adaptive plastic-fiber mixed filter material filter. The filter consists of filter material monomers, wherein each filter material monomer is formed by connecting a weight-balancing core body and paired corrosion-resistant balancing filtering wing bodies in a matching way; the surface of the weight-balancing core body is made of plastic; the weight-balancing core body is ellipsoidal; the threshold of the average density p0 of the weight-balancing core body is between 1.30 and 1.50 g / cm<3>; the two ends of a long axis of the ellipsoidal weight-balancing core body are provided with balancing wing bodies respectively; each balancing wing body is made from fiber bundles consisting of artificial fiber yarns; and the inner ends of the artificial fiber yarns constituting each fiber bundle are fixedly connected to each end of the long axis of the weight-balancing core body and the other ends of the artificial fiber yarns are in a diffused state so as to form a whisker form. The filter has the technical advantages of high porosity, high filtering speed, high filtering accuracy, low resistance, high filth holding capacity, small backwashing water using amount, high periodic water yield, low operating cost, small floor area and high anti-load impact capacity.

An integrated precipitation filtration process couples precipitation and a cloth media disk filter process into treatment structures. A microfiltration cloth filter plate is added below an effluent weir in a horizontal flow sedimentation process for filtering outlet water, so as to realize synchronized water outlet of the effluent weir and the microfiltration cloth filter plate, and integrated precipitation filtration process. After entering the equipment, raw water is uniformly distributed by a water distribution zone, and precipitated in a precipitation zone. After precipitation, the water is sent out respectively by the effluent weir and the microfiltration cloth filter plate, so as to realize solid-liquid separation. After a period of operation, when the microfiltration cloth filter plate is blocked, backwashing startup conditions are met; and when the backwashing procedure begins, a backwashing trolley and a backwashing pump are started at the same time to carry out backwashing on the microfiltration cloth filter plate. The process provided by the invention increases removal rate of solid particles having sink speed lower than that of the surface load of the sedimentation tank, and has better effect than a traditional precipitation process. The process couples precipitation and filtration and reduces land occupation; the precipitation process is helpful to delay pollution process on the microfiltration cloth filter plate; and filtering by the microfiltration cloth filter plate can improve treatment effect.

The invention relates to a method for simultaneously removing insoluble organic matter, total cyanogen and total nitrogen in wastewater of an industrial park. The method comprises the following steps: wastewater enters a high-efficiency coagulated decyanation reactor to remove total cyanogen in the wastewater removed from the coagulated decyanation reaction; effluent from the coagulating reaction enters an aeration biofilter, ammonia and nitrogen in the wastewater is oxidized into nitrate nitrogen or nitrite nitrogen, and partial organic matters are oxidized and removed; effluent from the aeration biofilter flows into a denitrification filter tank, and nitrate nitrogen and nitrite nitrogen in the wastewater are denitrified into nitrogen and removed; effluent from the denitrification filter tank is filtered in a V-shaped filter tank and then enters an ozone catalytic oxidation tank, and insoluble organic matters are oxidized into small-molecular organic matters or mineralized in the presence of a catalyst. The method can be used for oxidizing and degrading organic matters while removing total cyanogen and total nitrogen in the wastewater to ensure that treated effluent can be emitted in standard, thus having an excellent market prospect.

A filter for treating water is composed of a casing, a filtering drum consisting of a hollow central axle, a drum sleeving on said central axle and a filtering layer surrounding said drum and made of spiral strip plates or elastic fiber bundles, a reverse flushing air inlet at one end of said hollow central axle, and a speed reducer.

The invention discloses a purification method of starch sugar. The purification method comprises the following steps: (1) coating a compound precoat layer on a filter candle of a candle filter, wherein the compound precoat layer consists of cellulose and diatomite; (2) adding diatomite into a starch sugar solution, performing stirring for 30min, and then introducing the mixture into the filter candle from a liquid inlet of the candle filter to ensure that insoluble impurities in the starch sugar solution are intercepted and adsorbed, and a filtrate is obtained from a liquid outlet of the candle filter; and (3) decolorizing and refining the filtrate through an ion exchange resin system to obtain purified starch sugar, wherein the ion exchange resin system is formed by connecting a weak base anion resin column, a strong acid cation resin column and a weak base anion resin column in series. Compared with a conventional process, the starch sugar obtained by the method provided by the invention has a lower content of the insoluble particles, a lower chroma and a higher brightness, the cycle use of a decoloring assistant is achieved, the process is simplified, and the discharge of solid wastes and the generation of wastewater in a filtration process are reduced, so that the preparation method is beneficial for reduction of product production cost and environmental protection.

The invention discloses an oily wastewater treatment device and method. The oily wastewater treatment device comprises a wastewater tank, a suction pump, a powdered activated carbon storage tank and a contact tank, wherein the contact tank comprises a tank body and a ceramic membrane module, the ceramic membrane module is installed in the tank body, the tank body is provided with a water inlet, a water outlet, a residue discharging port and a powder inlet, the wastewater tank is communicated with the water inlet, the suction pump is communicated with the water outlet, the residue discharging port is formed in the bottom of the tank body, and the powdered activated carbon storage tank is communicated with the powder inlet to add the powdered activated carbon to the tank body. The ceramic membrane module is a container structure formed by a ceramic membrane and provided with an outlet, the outlet is communicated with the water outlet, and the ceramic membrane is formed by integrally firing a supporting layer and an effective layer provided with pore channel. By the adoption of the oily wastewater treatment device and the method, the water quality requirement of reused wastewater of an oil field can be met, and the suspended matter content and oil content of output water and the median size of suspended matter can all meet the highest requirement for reinjected water of the oil yield.

The invention relates to a filter and algae removal method by micro flocculation-terylene high elater fiber balls and equipment thereof. The method comprises: (1) the water to be treated and the flocculant which is added by a wriggle pump are mixed in an inflow pipeline in front of a fiber ball filter column, the water after mixing enters the fiber ball filter column, the filler of the filter column is terylene high elater fiber ball filter material, and the fiber ball filter column carries out reverse washing of low intensity at the end of the filter period; the equipment comprises an original water tank, a water storage tank and a drug adding groove, the original water tank is communicated with a pipeline mixer through a valve flow meter by a lift pump; the drug adding groove is communicated with the pipeline mixer by the wriggle pump, and a stirrer is installed in the drug adding groove; the apopore of the pipeline mixer sends the water to the water storage tank by the fiber ball filter column, and the terylene high elater fiber ball filter material is installed at the middle part of the filter ball filter column. By the terylene high elater fiber ball filter material with the characters of high porosity, large specific surface area, fast filter speed and strong pollutant stopping ability and long filter period, the effect on removing algae and turbidity substances in water is very obvious.

The invention discloses a small rapid filter equipped with an air and water backwash system. The small rapid filter comprises a filter body and is characterized in that the filter body is provided with a filter material layer, and the bottom of the filter material layer is provided with air and water distribution pipes which are also used as water collecting devices and water and air distribution devices for air and water backwashing; and the top and side wall of each water and air distribution pipe are provided with backwashing air holes, and each pipe bottom is provided with backwashing water holes. From the bottom to the top, the bottom of the filter is respectively provided with a lower supporting layer, water and air distribution pipes, an upper supporting layer and a filter material layer. One side of the filter is communicated with an intake canal, and the other side is communicated with the a water and air distribution chamber through the water and air distribution pipes; one end of the intake canal is provided with a water inlet pipe, and the other end is provided with a backwashing drainage pipe; and one end of the water and air distribution chamber is provided with a backwashing air pipe and a backwashing water pipe, and the other end is provided with a water outlet pipe. In operation, the fast filter reaches a filtration rate of 8 m / h, filtration period of 24-48 h, and water treatment amount of 700 m<3> / d. According to water supply demand, multi-group fast filters can be arranged for parallel operation, and the capacity expanding is convenient with basically no building work amount.

The invention discloses a strengthening method for removing ammonia nitrogen and organic matters in a rear activated carbon filter for ultrafiltration, particularly discloses a strengthening method for removing ammonia nitrogen and organic matters in the rear activated carbon filter for ultrafiltration in drinking water treatment, and aims to solve the problem that the capacity of the activated carbon filter for removing the ammonia nitrogen and the organic matters is limited. The strengthening method comprises the steps of firstly, arranging a coagulation sedimentation unit in front of an activated carbon filter, and arranging an ultrafiltration unit at the rear of the activated carbon filter; then, adopting different strengthening measures according to different concentrations of ammonia nitrogen and organic matters in inlet water of the activated carbon filter. The method comprises the following concrete steps: (1) when the concentration of the ammonia nitrogen is less than 1.5mg / L and the index of potassium permanganate is less than 3mg / L, changing the activated carbon filter to be in an upward flowing way; (2) when the index of the potassium permanganate is greater than 3mg / L, additionally arranging an ozone unit in front of the activated carbon filter in the step (1); (3) when the concentration of the ammonia nitrogen is greater than 1.5mg / L, aerating at the bottom of the activated carbon filter in the step (1); (4) when the concentration of the ammonia nitrogen is greater than 1.5mg / L and the concentration of the permanganate is greater than 3mg / L, combining the step (2) and the step (3).

The invention provides a filtering device, a sewage filtering system, and a sewage filtering technology, and belongs to the technical field of sewage treatment. The filtering device comprises filter tubes, magnetic rings and a water collecting tube, every filter tube comprises an outer screen tube, an inner screen tube and magnetic particles, and the magnetic rings can move along the length direction of the outer screen tubes in order to drive the magnetic particles to wriggle; and the water collecting tube communicates with the bottoms of the inner screen tubes to discharge filtered water. The filtering device can achieve rapid sludge formation, reduce the compactness of a sludge cake layer, increase the water permeability of the sludge layer, prolong the filtration cycle of a micro-screen dynamic membrane and improve the outlet water quality of the dynamic membrane. The sewage filtering system comprises a membrane tank, a gas supply device, a lifting device and the filtering device. The system has the advantages of the filtering device, the sewage filtering technology adopts the filtering system, and can effectively improve the sewage treatment effect through a membrane forming process, a filtering process and an aeration desliming process.

The invention discloses a method for advanced treatment of printing and dyeing wastewater. By means of a combined process of enhanced nano-iron coagulation, sand leach and ultrafiltration, the method includes that water in an original water tank is conveyed to a reactor through a pump to be subjected to mixing reaction with a nano-iron composited coagulant, then the water is filtered through a filtration column to enter in a water storage tank, conveyed to a circulation water tank through the pump, and subjected to cross flow filtration by using an ultrafiltration membrane assembly, clear water enters a recycling water tank, and concentrated water returns to the circulation water tank to participate in circulation. The invention further discloses a device for implementing the method. After operation of the method and the device, qualities of yielding water meet requirements of qualities of recycling water of urban sewage and industrial water, and the method and the device are wide in application prospect in advanced treatment fields of the printing and dyeing wastewater.

The invention provides an external component anaerobic membrane bioreactor and a waste water purification process thereof. The waste water purification process includes that a mixed liquid in an anaerobic tank is pumped into a ceramic internal pressure pipe type ultrafiltration membrane through a pump for a cross flow filtration, the mixed liquid contains anaerobic bacteria and diatomaceous earth, under the action of pressure difference, clear water is permeated outwards through the ceramic internal pressure pipe type ultrafiltration membrane and is led out, and a concentration mixed liquid reserved in the ceramic internal pressure pipe type ultrafiltration membrane is taken back to the anaerobic tank through a cross flow. Compared with anaerobic membrane bioreactors in prior art, the external component anaerobic membrane bioreactor has the advantages that during operating, a certain amount of the diatomaceous earth is added into the mixed liquid, consequently the scouring and washing effects on the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be strengthened, deposition and pollution of impurities to the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be effectively reduced, the permeation flux is stabilized, simultaneously the cross flow speed can be reduced, the energy consumption is lowered, the filtering period of the ceramic internal pressure pipe type ultrafiltration membrane is prolonged, and the chemical cleaning frequency is reduced.

The invention belongs to the technical field of sodium silicate production, and particularly relates to a filtering refining technology for liquid-state sodium silicate. The technology comprises the following steps that 1, a flocculating agent is added in crude liquid-state sodium silicate at 80-95 DEG C, then the mixture is stirred for 30-60 minutes and stood for 10-15 hours, and flocculation liquid is obtained; 2, filtering aid is added in the flocculation liquid, and filtering is performed with a filtering device; 3, during filtering, when the internal and external pressure difference of the filtering device is larger than 0.2 MPa, the pressure at a filtering liquid outlet is increased, the internal and external pressure difference of the filtering device is maintained to be smaller than 0.2 MPa during filtering until filtering is finished, and then clear sodium silicate liquid and filter residues are obtained. According to the filtering refining technology for the liquid-state sodium silicate, the product purity and quality are improved, the filtering amount and filtering speed are effectively increased, the filtering cycle is prolonged, the production efficiency is improved to the utmost extent, the manufacturing cost is lowered, and benefits are brought to enterprises.

The invention discloses a cooling fluid filtration cycle system. The cooling fluid filtration cycle system comprises a first fluid storage tank, a first filtering tank and a second fluid storage tank which sequentially communicate with one another from top to bottom. The second fluid storage tank communicates with a second filtering tank through a fluid guide tank. A transfer belt is arranged inside the first filtering tank and further comprises a driving roller, a driven roller and a conveying belt with sieve holes. The driving roller and the driven roller are connected to the front end and the rear end of the first filtering tank in a rotating mode correspondingly. A magnetic roller is arranged at a fluid inlet of the second filtering box and is further located below a fluid guide tank outlet. The axis of the magnetic roller is located at the outer side of the edge of the fluid guide tank outlet. A material receiving plate is arranged at the outer side of the magnetic roller. A scraper blade is connected along the inner side edge of the material receiving plate. The scraper blade makes contact with the circumferential face of the magnetic roller. A fluid discharging connector is arranged on the outer wall of the second filtering tank. By means of the cooling fluid filtration cycle system, cooling fluid can achieve multi-level filtration, direct filtration and indirect filtration are combined, and the filtering effect is good; and meanwhile the effect of deslagging while filtration is achieved, and filtering efficiency is high.

The invention discloses an adjustable composite dynamic filtering device. The device comprises a tank body, the middle part of the tank body is filled with a filter material layer, the upper part of the tank body is provided with a water inlet, the bottom of the tank body is provided with a water outlet, the filter material layer comprises a top fluidized bed layer and a lower fixed bed layer, andthe thickness and / or height of the fluidized bed layer is adjustable; a backwashing drain pipe is vertically mounted in the tank body, and a solid-liquid separator located in the tank body is mountedat the top of the backwashing drain pipe; a water inlet branch pipe is arranged at the water inlet, and the tail end of the water inlet branch pipe is connected to the middle part of the backwashingdrain pipe; and the water inlet corresponds to the fluidized bed layer, and is tangent to the tank body. According to the invention, large particles in inflow water can be adsorbed in the fluidized filter material layer, and fine particle pollutants in the inflow water can go deep into the lower filter bed, and in addition, the filter material with a large active catalyst medium specific surface area increases the dirt holding capacity of the filter material layer and prolongs the filtering period of the filter.

The invention discloses a nitrogen release technology applied to a deep denitrification filter bed process for sewage treatment. According to the technology, the maximal head loss caused by suspended solids, biological sludge and nitrogen accumulated in a filter bed within a nitrogen release interval period is set to be a fixed value delta Hmax by a total head loss control nitrogen release technology; the value is input into a control system; and when a head loss measurement parameter of the filter bed in the filtration and denitrification processes rises to the delta Hmax, nitrogen release is started. According to the nitrogen release technology in the scheme, gas-water full recoiling is controlled by heat loss experience curve or time generated when filter bed intercept suspended solids. The nitrogen release technology carries out parameter correction by increasing the suspended solids and the biological sludge to cause head loss, can dynamically simulate the process of accumulating nitrogen and then releasing nitrogen in the filter bed, can accurately judge each nitrogen release period, can prolong the filter period of the filter bed, can reduce the nitrogen release frequency of the filter bed, and can lower energy consumption and water consumption in operation of the filter bed.

The invention relates to a homogeneous particle filter material reverse granularity rapid filter which is communicated with a to-be-filtered water inlet pipe and a backwashing water inlet pipe, the rapid filter is sequentially provided with a water distribution chamber, a water distribution system, an under layer, a particle filter material layer, a backwashing water trough and a filtered water collection trough from bottom to top, wherein one end of the filtered water collection trough is provided with a clear water channel, the filtered water collection trough is communicated with the clear water channel, a drainage channel is arranged under the clear water channel, the backwashing water trough is communicated with the drainage channel, and the to-be-filtered water inlet pipe and the backwashing water inlet pipe are communicated with the water distribution chamber to ensure that to-be-filtered water enters from the bottom of the filter; and the filtering material layer thickens from top to bottom and has little resistance and more intercepted suspended matters. Compared with the downward flow positive granularity filter on the same scale, the rapid filter has the advantages of being capable of improving water yield by about 40 percent and saving investment by 30-40 percent, correspondingly reducing volume and obtaining remarkable economic benefit.

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.