63results about How to "Reduce backwash times" patented technology

The invention discloses a spinning printing and dyeing waste water reclamation method, a device and the application thereof. The method comprises the steps of: filtering spinning printing and dyeing waste water; sequentially carrying out homogenizing, equalizing quantity and primary sedimentation on filtrate; adding sodium chloride into waste water supernate, and evenly mixing for indirect electro-catalysis oxidation; sequentially evenly mixing the waste water treated by indirect electro-catalysis oxidation with basic aluminium chloride and polyacrylamide; removing the precipitated supernate, and sequentially treating by activated carbon adsorption and reverse osmosis; removing trace organic chloride generated in the electrolytic process and the rest COD and color; and obtaining recyclable water resource. The device for realizing the method comprises a grate, a regulating reservoir, a sealed electrolytic cell, a flocculation tank, an inclined tube sedimentation tank, a sand filter tank, an active carbon filter, an intermediate water tank, a reverse osmosis unit, a clear water reservoir, a brine tank, a chlorine absorbing tank, a sludge concentration tank and a plate-and-frame filter press. The invention can effectively treat spinning printing and dyeing waste water, and has the advantages of high treatment efficiency, stable effluent quality, simple technological process and the like.

A process for deeply cleaning drinking water by immobilized bioactive carbon includes such steps as coagulating-depositing, filtering, ozone treating in ozone contact tower, treating by the engineering microbes immobilized activated carbon column in reaction tower and ultraviolet disinfecting.

The invention relates to an filtering pool, includes a square pool, multichip unit filters arranged in the pool, a first clapboard, a second clapboard, a third clapboard connected in turns in the pool, the first clapboard is erected in between a water outlet end and end of the multichip unit filters, the second clapboard is supported on bottom of the multichip unit filters and kept space from bottom of the pool, filter bracket of each unit filter includes a substrate and a frame-type lateral plate, filtration medium is lied on external surface of the frame-type lateral plate and the substrate on the bottom is provided with at least one purified water outlet, and position on the second clapboard corresponding to each purified water outlet is provided with purified water outlet. Comparing with the prior art, the invention applies combination of unit filter processing units, capable of setting processing units flexibly according to processing capacity. The invention provides advantages of low energy consumption, filter screen with small pore diameter, abrasion-resistance, high fltering speed, good water quality, high processing efficiency, easy replacement and low cost.

The invention relates to a preparation method for a novel inorganic flocculating agent and an enhanced coagulation method for treating a low-temperature low-turbidity high-organic matter water body by using the inorganic flocculating agent. The objective of the invention is to overcome the problems that conventional coagulants and coagulation processes do not simultaneously have the advantages of high efficiency, low cost, no toxicity and simple preparation process in treatment of one or a plurality of composite difficult-to-treat water bodies with low temperature, low turbidity and high content of organic matters. The preparation method provided by the invention comprises the following steps: uniformly dispersing a water glass solution with a certain concentration into a metal salt solution with a certain concentration and carrying out stirring and curing so as to obtain the inorganic flocculating agent. The enhanced coagulation method comprises the following steps: adding a traditional coagulant in the stage of mixing during water treatment process; then adding the inorganic flocculating agent after a mixed reaction; adding alkali lye into a water pipeline located between a sedimentation tank and a water conveying pump station or into the body of the sedimentation tank; and adjusting a pH value. The inorganic flocculating agent and the enhanced coagulation method are applicable to treatment of tap water, domestic sewage and industrial waste water.

The invention discloses a water treatment method of a directional self-repairing flat-plate ceramic membrane assembly. The water treatment method comprises the following steps: firstly, arranging nanocatalytic type titanium dioxide asymmetric separation membranes on the surfaces of flat-plate ceramic membranes; then assembling the flat-plate ceramic membranes to form a flat-plate ceramic membraneassembly; arranging a rotary hairbrush capable of randomly scrubbing the flat-plate ceramic membrane surfaces up and down between the flat-plate ceramic membranes in the flat-plate membrane assembly;arranging an ultraviolet generation device between the flat-plate ceramic membranes; adding ozone and H2O2 into a medium for backwashing. According to the water treatment method of the directional self-repairing flat-plate ceramic membrane assembly, microorganism bacteria and organic matters on the surfaces of the membranes can be directionally killed and decomposed and rapidly degraded, so thatmembrane pollution can be effectively reduced and the number of times of backwashing and the backwashing frequency are greatly reduced. The effective working time of equipment is greatly prolonged andthe water flux in unit time is greatly increased; the water flux is increased by 30 percent or above under the same condition. Organic matters, oil stain, bacteria and the like on the surfaces of themembranes are randomly and directionally decomposed in time and the surfaces of the membranes keep clean so that the filtering effect and the filtering efficiency are improved.

The invention discloses an in-situ activation modification treatment method for a suspended filter material, which comprises the following steps of: putting 35 to 75 parts of suspended filter material into 25 to 65 parts of activating solution, stirring for 20 to 30 hours at a speed of 60 to 100 rpm, and soaking for 1 to 3 days; and taking the suspended filter material out of the activating solution, and airing. Compared with the conventional system, a wastewater denitrification treatment system with the modified suspended filter material has the advantages that: (1) the wastewater denitrification treatment system performs aeration in the same tank to remove C and N simultaneously, so the operational control process is simple; (2) COD is not needed to be removed before nitrification; (3) an additional carbon source is not needed to be added for denitrification; (4) acid and alkali respectively generated by the nitrification and denitrification can be partially neutralized mutually, and the addition of reagents is reduced; and (5) effluent backflow is not needed, and a secondary sedimentation tank is not arranged, so the occupied area and investment of equipment are reduced.

The invention discloses a randomly cleaned hollow flat sheet membrane component which comprises a component frame and a flat diaphragm component, wherein the component frame is a rigid component for fixing the flat diaphragm component and an aeration mechanism; the flat diaphragm component comprises flat diaphragms (10) which are arranged at intervals, and an upper plug and a lower plug which are integrally formed with the flat diaphragms; brushes (9) for cleaning the surfaces of the flat diaphragms is arranged on the flat diaphragms; two ends of the brushes are arranged on holding racks (12); the holding racks can be lifted up and down on the component frame. By adopting the randomly cleaned hollow flat sheet membrane component, adsorbate on the flat diaphragms can be randomly cleaned in time, the surfaces of the flat diaphragms can be kept clean, the filtering efficiency is improved, halt backwash is not needed, the times of backwash are reduced, the working time is prolonged, the working efficiency is improved, the problems that the flat diaphragm component is hard to clean, low in cleaning efficiency and the like are solved, the service life of a flat diaphragm reactor is effectively prolonged, the reliability of the flat diaphragm reactor is effectively improved, and the effluent flux is increased.

The invention relates to the technical field of sewage treatment and provides a short-term hunger based method for denitrification and a denitrification biofilter system. The method comprises the steps: subjecting a first denitrification biofilter and a second denitrification biofilter to inoculated biofilm formation separately, and carrying out stable operation for a plurality of days after biofilm formation is completed; and connecting the first denitrification biofilter and the second denitrification biofilter in series, enabling sewage to enter the two denitrification biofilters in an alternate reversing manner, only supplying carbon to the denitrification biofilter, through which fluid firstly passes, and carrying out stable operation for a plurality of hours. According to the short-term hunger based method for denitrification, provided by the invention, the two filters are connected in series, and operation is carried out in an alternate water entering / exiting manner, so that alternate operating of a short-term hunger state and a nutrition recovering state is achieved; and activity of denitrifying bacteria is excited in the short-term hunger state, and higher consumption capability is shown after a carbon source is added again, so that the problem that COD of effluent cannot stably reach standards due to the fact that the carbon source is introduced excessively when denitrification is complete is settled.

The invention relates to a treatment method of industrial wastewater, wherein the method comprises the following specific technological process: high-salt and high-COD concentrated water enters an advanced oxidation reactor through a sewage pump, and the advanced oxidation reactor is internally provided with a special catalyst layer and a catalyst support layer from top to bottom successively, the catalyst support layer is internally filled with activated alumina based multi-phase catalyst with the particle size of 5-15 cm, and the specific catalyst layer is internally filled with a specific catalyst; the high-salt and high-COD concentrated water undergoes a full mixed reaction with ozone provided by a plasma generator in the advanced oxidation reactor, and effluent after the reaction is directly discharged to the outside; tail gas is treated successively through a gas-liquid separation tank, a pre-oxidation tank, an ozone annihilator / ozone destructor and a cold drying and filtration system, and then enters an oxygen storage tank; and the tail gas in the oxygen storage tank is pressurized and then passes through the plasma generator, and is supplied for the whole system to use in a new ozone form finally.

The invention discloses an MBR (membrane bioreactor) sewage treatment machine. The MBR sewage treatment machine comprises an anaerobic tank, an MBR membrane tank and a disinfection tank which are sequentially connected in an integrated manner, wherein a sewage inlet is formed in a side wall, far away from the MBR membrane tank, of the anaerobic tank, elastic filler is arranged in the tank wall of the anaerobic tank, and two rows of anaerobic tank separating plates are vertically arranged in the anaerobic tank at intervals and are alternately fixed on a top cover and a bottom wall of the anaerobic tank; an aeration pipeline is arranged at the bottom of the MBR membrane tank, the aeration pipeline is connected with a blast blower, the bottom, far away from the anaerobic tank, of the MBR membrane tank is connected with a reflux pump, and the water outlet of the reflux pump is connected to the sewage inlet of the anaerobic tank; and the disinfection tank is connected with a disinfector, and two rows of disinfection tank separating plates are vertically arranged in the disinfection tank at intervals and are alternately fixed on a top cover and a bottom wall of the disinfection tank. The MBR sewage treatment machine disclosed by the invention has the advantages that sewage treatment effect is good, and service life of an MBR membrane can be prolonged.

The invention provides a method for improving the in-situ activation and modification efficiency of a suspended filter material. A PP (polypropylene) resin is admixed with hydrothermal reaction wood micropowder rich in carboxyl groups and other acidic oxidation groups, so that the surface wettability, hydrophilicity and biocompatibility of the PP resin are enhanced, thus finally producing a granular PP hydrophilic suspended filter material; the in-situ activation and modification efficiency of the suspended PP filter material is improved by changing the production raw material formula of the PP filter material; the treatment efficiency is improved; the whole denitrification system only needs to control an independent building, only aerobic reaction conditions need to be controlled in the denitrification process, and the normal operation of the system can be ensured to complete high-efficiency denitrification without supplementing a certain buffer solution for compensating for alkalinity consumed in the nitration reaction, so that the effluent water can meet the requirements for reuse of reclaimed water. Meanwhile, the sludge is reduced, and the yield of the surplus sludge is reduced by 30% in comparison with the original treatment method, so that the operating cycle is relatively prolonged, and the back flush frequency and the backwash water quantity are reduced, thereby lowering the operating cost.

The invention relates to a city watercourse drain outlet sewage treatment method. The method mainly comprise the steps of regulation, wherein sewage is introduced into a regulating reservoir for regulation; mixing with flocculant, wherein sewage in the regulating reservoir is led out to be mixed with flocculant; flocculent settling, wherein sewage mixed with flocculant is sequentially introduced into a baffle flocculation reaction tank and a settling tank for sewage flocculation and sludge precipitation separation; denitrification, wherein water discharged from the settling tank and part of water discharged from a nitration aerating filter are introduced into a denitrification filter for denitrification; aerobiotic nitration, wherein water discharged from the denitrification filter is introduced into a nitration aerating filter for nitration; filtration, wherein part of water discharged from the nitration aerating filter is introduced into a filtering device for filtration. The invention further provides a sewage treatment device adopting the method. The sewage treatment device comprises a regulating reservoir, a pipeline mixer, a baffle flocculation reaction tank, an oblique plate settling tank, a denitrification filter, a nitration aerating filter and a clear water pond which are connected in series, wherein a water outlet pipeline of the clear water pond is connected to a filter device.

A natural filtering system for the treatment of swimming pool water and / or treatment processes in other applications involving the use of water (aqueducts, wells, drinking water purification plant, filtering plant for the collection of rain water, etc.), which can be installed inside compensation tanks in the case of swimming pools or in storage tanks or decantation tanks for other applications, and where the compensation tank (26) is filled with a filtering mass (14), comprising microparticles of high-efficiency quartz sand or similar or other material suitable for treating water, and where the mass is supported by at least one plate (15) extending over the entire surface of the compensation tank, and where the plate rests on at least one micromesh net made from high-density polyethylene, and where the water in the compensation tank (26) is purified by gravity-fed sprays (12); and by feeding stabilised and non-stabilised disinfectants (22) and pH correctors (23) into the compensation tank.

According to the invention, sludge at the bottom of the inclined tube is removed without cutting off water so that the inclined tube is recovered to the initial state, and the inclined tube sedimentation tank is in the most ideal working state. By keeping the inclined pipe smooth for a long time, the water treatment capacity of the inclined pipe can reach three times of the maximum water treatment capacity of the original design, and theoretically, the water treatment capacity is improved by two times on the basis of the maximum water treatment capacity of the original design and is equivalent to three hundred percent of the maximum water treatment capacity of the original design. Due to the fact that the inclined tube is smooth for a long time, the effluent quality of the existing inclined tube sedimentation tank is no longer deteriorated gradually and is kept at an optimal index far higher than that of the original design for a long time, by taking a water supply plant as an example, the effluent quality of the novel inclined tube sedimentation tank is generally kept at 0.5 NTU, and compared with a common inclined tube sedimentation tank, the effluent quality is improved by one order of magnitude. For a reclaimed water or sewage treatment plant, fine particles in the effluent are effectively reduced besides the original design indexes so that the ammonia nitrogen content in the effluent is effectively reduced.

The invention discloses a method for removing chlorobenzene from original water through combination of blowing-off and powdery carbon adsorption, relating to a method for removing chlorobenzene from original water. The invention solves the problems that powdery active carbon has low chlorobenzene removing capability, high investment, bad influence on subsequent water treatment units and high treatment cost because powdery active carbon is used for emergent water treatment during accident chlorobenzene pollution. The method comprises the following steps: firstly, blowing air into original waterpolluted by chlorobenzene for blowing off; secondly, adding powdery carbon to the original water after blowing off, and then carrying out mixing and absorption. In the invention, chlorobenzene removal rate is from 95% to 96.5%, the method is simple and feasible, chlorobenzene content in the original water can be quickly and effectively reduced, chlorobenzene treatment effect is stable, carbon addition is low without bad influence on the subsequent water treatment units, and the treatment cost is low; blowing-off and powdery carbon adsorption are used as two safety barriers for accident chlorobenzene pollution to the original water, and the invention improves the safety insurance of the quality of water output from a water plant.

The invention provides a method for removing nitrogen and phosphorus and strongly removing suspended matter. The method is realized by a nylon filtering net and a double-layer filtering material filtering device. The filtering device consists of a bearing layer, double filtering material layers, an aeration device, a backwashing device, a water intake system and a water drainage system. The basic operation method comprises the following steps of filling equipment with two different filtering materials; treating the to-be-treated sewage by a lower biological filtering device; removing the remaining suspended matter at high efficiency under the actions of physical trapping and biological membranes of the nylon filtering net; treating by an upper biological filtering device, so as to obtain the purified drained water. The device is used for realizing the different aeration and backwashing types. The method has the advantages that according to different requirements, the operation conditions, such as aeration time and intensity, type of filtering material, and backwashing cycle, are adjusted at any time; the richness of water treatment microbial populations in the filtering device and on the nylon filtering net is improved, and the effect of removing the suspended matter, nitrogen and phosphorus is better.

The invention provides a process for the advanced treatment of mine water, which comprises the following steps of: carrying out primary precipitation on the mine water; carrying out coagulation on the mine water which is subjected to the primary precipitation; clarifying the mine water which is subjected to the coagulation; filtering the clarified mine water; adding acid into the filtered mine water; aerating the acidified mine water; carrying out electric adsorption desalination on the aerated mine water; and disinfecting the desalinated mine water. The invention further provides a system for the advanced treatment of the mine water, and the system comprises a primary precipitation tank, a clarification tank, a first filtering device, an aeration tank, an acid tank, an electric adsorption module and a disinfector, wherein an inlet of the clarification tank is communicated with outlet water of the primary precipitation tank, an automatic coagulant adding system is arranged at the inlet of the clarification tank, an inlet of the first filtering device is communicated with the clarification tank, an inlet of the aeration tank is communicated with an outlet of the first filtering device, an outlet of the acid tank is communicated with the aeration tank, acid can be added into the aeration tank through the acid tank, an inlet of the electric adsorption module is communicated with an outlet of the aeration tank, and the disinfector is communicated with a purified water outlet of the electric adsorption module. According to the process and the system for the advanced treatment of the mine water, the salinity of the mine water is effectively lowered.

The invention discloses a filter backwashing system and process and a control method. The filter backwashing system comprises a filter backwashing water inlet valve, a filter backwashing water discharge valve, a filter backwashing water inlet valve, a filter water outlet valve, a filter air inlet valve and a filter forward washing water discharge valve which are arranged on a filter, wherein the filter backwashing water inlet valve is connected with a water inlet pipeline, the filter backwashing water discharge valve and the filter forward washing water discharge valve are connected with a recovery water tank through pipelines, the filter backwashing water inlet valve is connected with a filter backwashing water pump through a pipeline, the filter air inlet valve is connected with a backwashing Roots blower through a pipeline, the filter water outlet valve is used for producing water through a water production pipeline, the top of the filter is connected with a filter exhaust valve through a pipeline, and a liquid level switch is arranged at the tail end of the filter exhaust valve. According to the invention, organic matters and microorganisms in a filter material can be effectively removed, the backwashing effect of the filter is improved, the backwashing frequency of the filter is reduced, and the service life of the filter material of the filter is prolonged.

The invention provides a method and a device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through a low-intensity magnetic field, and belongs to the technical field of denitrification. Under the action of a low-intensity magnetic field, microorganisms are inoculated on an iron-carbon carrier, nitrate-nitrogen-containing inlet water is introduced, iron-carbon micro-electrolysis corrosion hydrogen evolution and iron-carbon micro-electrolysis autotrophic denitrification are carried out, and nitrate-nitrogen-removed outlet water is obtained. Iron-carbon micro-electrolysis autotrophic denitrification is carried out under the condition of a low-intensity magnetic field, the activity of microorganisms and related enzymes can be improved, the corrosion potential of an iron-carbon carrier can be reduced, the iron-carbon micro-electrolysis corrosion hydrogen evolution rate is increased, the precipitation position and the precipitate attribute can be changed through the Lorentz force and the magnetic field gradient force effect, therefore, the formation of an iron-carbon carrier passivation film is relieved, and the nitrate nitrogen removal effect of microorganisms is effectively improved.

The invention relates to a high-efficiency sterilization device, a high-efficiency sterilization method and a swimming pool water treatment circulating system with the sterilization device. The high-efficiency sterilization device comprises a sterilization filtering unit and a sterilization unit, wherein the sterilization filtering unit is used for killing microbes in water, filtering the sewage in the water and conveying the treated water to the sterilization unit, and back washing can be realized while sterilization filtering is performed; and the sterilization unit is used for releasing the sterilization substances and killing the remaining and growing microbes in the conveyed water. The method mainly comprises the following steps: checking whether a filtering jar needs to be subjected to back washing, and carrying out the sewage purification treatment process. The swimming pool water treatment circulating system utilizing the device comprises a water conveying unit and a sewage interception unit, wherein the water conveying unit is used for conveying circulating water flow to pass through the whole circulation system; and the sewage interception unit is used for intercepting the pollutants in the circulating water in the water conveying unit. The sterilization filtering and back washing can be simultaneously performed, the circulating water treatment efficiency is improved, the bacteria in the swimming pool circulating water can be completely killed, and growth of the bacteria in the swimming pool water is avoided.

The invention provides a method for removing solid impurities from catalytic oil slurry. According to the method, an agent and oil mixing unit, a centrifugal deasphalting unit, a light oil slurry filtering unit, a light oil slurry desolventizing unit and a heavy oil slurry desolventiziing unit are arranged. Catalytic oil slurry and a solvent are completely mixed, and asphaltene in the oil slurry is removed through centrifugal separation according to different solubility, on each component of the oil slurry, of the solvent, so that the influence on oil slurry filtration by the asphaltene is reduced, the oil slurry filtration reliability is improved and long-cycle stable operation of an oil slurry filtering system is guaranteed. The solvent is recovered and recycled through the light and heavy oil slurry desolventizing units, so that consumption of the solvent is reduced.

The invention discloses a process for treating a eutrophic water source in a water plant. The process comprises the following specific steps of: feeding water from the eutrophic water source into a biological film filtering pond for pretreating; and feeding into a first sewage treating pond and a second sewage treating pond which are provided with different spiral overlapped filtering materials with different specific weights for deeply filtering. In the process for treating the eutrophic water source from the water plant, novel spiral overlapped filtering materials are adopted in a filtering step, so that the flow structure is simplified; and the process has the advantages of high water saving property, saving in space, saving in energy, easiness for managing, and the like.

The invention discloses an automatic filter residue concentrating filter, which is simple in structure, has few moving and wearing parts, is high in efficiency and is energy-saving, can significantly reduce the backwashing times, has greatly lowered backwashing water consumption, and can highly concentrate filter residues. The automatic filter residue concentrating filter consists of an electromagnetic vibrator, a vibrating tube, a barrel body, a filter screen barrel, a residue discharging control valve, electromagnetic valves, water inlet pipes and a water outlet pipe, wherein the filter screen barrel is arranged inside the barrel body; the vibrating tube, the electromagnetic vibrator and the water inlet pipes are arranged on the filter screen barrel; residue discharging pipes and the residue discharging control valve are arranged at the lower end of the filter screen barrel; the water outlet pipe is arranged at the lower end of the barrel body. When the automatic filter residue concentrating filter works, under the actions of vibration of the electromagnetic vibrator and pressure of a water pump, the filter residues in feed liquid entering the filter screen barrel quickly precipitate to the lower end of the filter screen barrel, and are discharged out of the automatic filter residue concentrating filter from the residue discharging pipes by passing through the residue discharging control valve; filtered water flows out from a filter screen, and flows out of the automatic filter residue concentrating filter through the water outlet pipe at the lower end of the barrel body; when the inner wall of the filter screen barrel is blocked, backwashing water enters the barrel body, and enters the filter screen from the filter screen barrel to backwash the filter residues on the filter screen, and sewage is discharged out of the automatic filter residue concentrating filter from a drain pipe by passing through the outer residue discharging pipe.

The invention discloses an upward-flow heterogeneous filter material filter tank which comprises a filter tank body, the bottom of the filter tank body is divided into a water and gas distribution space at the bottom and a filter tank at the upper part through a partition plate, a plurality of long-handle filter heads are arranged on the partition plate to communicate the water and gas distribution space with the filter tank, the bottom of the filter tank is a supporting layer, and the upper part of the supporting layer is a filter material layer. A water outlet groove is formed above the filter material layer in the length direction of the filter tank, the tail of the water outlet groove is communicated with a water outlet channel in one side of the filter tank, a water inlet branch channel is formed in the other side, symmetrical to the water outlet channel, of the filter tank, a water inlet pipe is arranged at the bottom of the water inlet branch channel, and the outlet end of the water inlet pipe is communicated with the water and gas distribution space; and the filter material layer and the supporting layer are filled with a filter material which is a heterogeneous filter material, and the particle sizes of the heterogeneous filter materials are sequentially increased from top to bottom. The heterogeneous filter material is adopted in the filter tank, the obtaining cost of the filter material is low, arrangement with the small upper particle size and the large lower particle size can be naturally formed after backwashing, and the filtering efficiency of the filter tank can be better improved.

The invention relates to system design technology of the cyclotron, particularly to a circulating water system of a cyclotron and a water saving method of the circulating water system. A first water circulating and a secondary water circulating of the circulating water system are all in enclosed structures, and water evaporation and loss in water circulation channels is avoided. Optimization is performed on the system process including water supply and water quality improvement, and concentrated water is fully recycled (about 7tons / per day); about 1.5 tons of water is consumed in a backwashing of a pre-treatment system, a backwashing period is changed in a scientific and reasonable manner, with the conventional powered timing replaced by work timing, and unnecessary backwashing is greatly reduced. By the water saving method, 8tons water is saved per day, at the premise of high-quality quality of the circulating water, waste water drainage is reduced, and long-term, constant and low-cost running of the cyclotron is guaranteed.

The present invention relates to a water-saving type filtration tank. The tank mainly comprises a backwash pipe, a backwash valve, a tank body, a water inlet, a filtration material support component, a filtration material, a water outlet, a water outlet valve, a mud discharge port and a mud discharge valve. The filtration material support component and the filtration material are combined to form a filtration unit. The filtration unit is arranged in the water inside the filtration tank. The backwash pipe and a water outlet pipe are connected by the filtration unit. The filtration unit has a structure with a thin lower part and a thick upper part. During the filtering process, water requiring filtration passes through the filtration material from outside to inside, enters the inner of the filtration unit, and finally is discharged by the water outlet. Due to the filtration unit structure with the thin lower part and the thick upper part, the suspended solids trapped by the filtration material are accumulated to a certain extent so as to separate from the filtration material, and sink on the bottom of a precipitation tank by the gravitational effect, such that the number of the backwash is reduced. When the backwash is required, the water outlet valve is closed, the backwash valve is opened, the backwashing sludge directly enters the filtration tank and does not need discharge, and the sludge in the backwashing water sinks on the bottom of the filtration tank. The number of the backwash of the filtration tank is less, and the discharge of a large amount of the backwashing water is not required, such that the significant water-saving effect is provided.

The invention provides a method for removing nitrogen and phosphorus and strongly removing suspended matter. The method is realized by a nylon filtering net and a double-layer filtering material filtering device. The filtering device consists of a bearing layer, double filtering material layers, an aeration device, a backwashing device, a water intake system and a water drainage system. The basic operation method comprises the following steps of filling equipment with two different filtering materials; treating the to-be-treated sewage by a lower biological filtering device; removing the remaining suspended matter at high efficiency under the actions of physical trapping and biological membranes of the nylon filtering net; treating by an upper biological filtering device, so as to obtain the purified drained water. The device is used for realizing the different aeration and backwashing types. The method has the advantages that according to different requirements, the operation conditions, such as aeration time and intensity, type of filtering material, and backwashing cycle, are adjusted at any time; the richness of water treatment microbial populations in the filtering device and on the nylon filtering net is improved, and the effect of removing the suspended matter, nitrogen and phosphorus is better.

The invention discloses an anaerobic membrane bioreactor for sewage treatment. The anaerobic membrane bioreactor comprises a shell and a filter material layer arranged in the shell, and further comprises a high-pressure gas backflushing structure arranged above the filter material layer and comprising a high-pressure gas distribution structure and a plurality of high-pressure gas nozzles arrangedon the high-pressure gas distribution structure, wherein openings of the high-pressure gas nozzles face the filter material layer; a low-pressure gas disturbance structure arranged below the filter material layer and comprising a low-pressure gas distribution structure and a plurality of low-pressure gas nozzles arranged on the low-pressure gas distribution structure, wherein openings of the low-pressure gas nozzles face the filter material layer; when the filter material layer is blocked, high-pressure gas sprayed by the high-pressure gas nozzles is used for backwashing the filter material layer; and when the filter material layer is not blocked, the low-pressure gas nozzles are used for spraying low-pressure gas near the filter material layer to improve the flowability and disturbance ofsewage near the filter material layer, so that the scouring effect of the sewage on the filter material layer is improved, the blocking period of the filter material layer is prolonged, the treatmenteffect of the reactor is improved, and the backwashing frequency is reduced.

The invention discloses a method for pretreating source water with combined pollutants of high-concentration ammonia nitrogen, high-concentration organic matter and manganese, belonging to the field of drinking water treatment and aiming at solving the problem of the combined pollution of high-concentration ammonia nitrogen, high-concentration organic matter and manganese in the source water. The method includes the steps as follows: firstly, adding potassium permanganate composite (PPC) in the source water for chemical preoxidation; and secondly, introducing the source water after chemical preoxidation into a biological aerated filter for treatment, wherein the biological aerated filter takes volcanics as fillers, so that pretreatment of the source water is realized. The method achieves permanganate index removal rate of 20%-35% and ammonia-nitrogen removal rate of above 80%, and obviously relieves pollution-removal load of a follow-up technology.

The invention discloses an upward flow heterogeneous filter material filter tank, which comprises a filter tank body, the bottom of the filter tank body is divided into a water distribution and gas distribution space at the bottom and an upper filter tank by a partition board, and multiple filters are installed on the partition board A long-handle filter head connects the water distribution and air distribution space with the filter tank. The bottom of the filter tank is a support layer, and the upper part of the support layer is a filter layer. Above the filter material layer is a water outlet along the length of the filter. The outlet channel on one side of the filter is connected, and the other side symmetrical to the filter tank and the outlet channel is provided with a water inlet branch channel. The bottom of the water inlet branch channel is provided with a water inlet pipe. The outlet end of the water inlet pipe is connected with the water distribution and air distribution space. The filter material layer and The supporting layer is filled with filter material, and the filter material is a heterogeneous filter material, and the particle size of the heterogeneous filter material increases sequentially from top to bottom. The filter adopts non-homogeneous filter material, and the acquisition cost of the filter material is low. After backwashing, it will naturally form an arrangement of small particles at the top and large at the bottom, which is more conducive to the improvement of the filtration efficiency of the filter.