340results about How to "Reduce sedimentation" patented technology

The present invention relates to pipes that convey any flowable medium, such as chemicals, food and in particular, oil and gas, and more particularly to a system of pipes having different coatings or linings for the interior and exterior surfaces of such pipes, depending on the environment in which the pipes are used. The pipes may be coated with different materials, which may be of different thicknesses, with various configurations of coatings or linings. Such coating may be done on the interior and / or the exterior of the pipes.

The present invention relates to one kind of protocyanidin oligomer and its production process and application in food, health article, feed additive and animal medicine. The protocyanidin oligomer is dimer, trimer and tetramer, and is produced with condensated tannin as material and through oxidizing degradation with hydrogen peroxide or potassium chlorate as oxidant to obtain yellow or brown semi-transparent liquid and subsequent separation and purification. The protocyanidin oligomer of the present invention has powerful antioxidant function and antibiotic function, and my be used in food owing to no astringent taste and no negative effect on the activity of amylase in digestive tract, as feed additive to reduce coccidiosis infection of fowls and low cholesterol content in egg.

The invention relates to a damping-adjustable magneto-rheological lag damper. The damping-adjustable magneto-rheological lag damper comprises a cylinder barrel, a piston rod, a piston component and a damping adjusting mechanism. Stub shafts are integrally produced at the outer edge of the left end of the cylinder barrel symmetrically and radially, and an end cover is mounted at the right end of the cylinder barrel hermetically and coaxially. The piston rod is penetratingly mounted in the cylinder barrel coaxially, and two ends of the piston rod are positioned outside the cylinder barrel. The piston component is mounted at the position, on the inner left side of the cylinder barrel, of the piston rod coaxially. The damping adjusting mechanism is slidably mounted at the position, corresponding to the piston component and positioned on the inner right side of the cylinder barrel, of the piston rod coaxially and rotates around an axial center by a certain angle prior to being fittingly mounted together with the piston component, and the left end, positioned outside the cylinder barrel, of the piston rod is in coaxial threaded connection with a rod-end joint bearing. The damping-adjustable magneto-rheological lag damper has the advantages of simple structure, low energy consumption, small size, rapidity in response, continuous forward and reverse adjustability in damping force within a wide range, good temperature stability, easiness in combination with a computer to achieve intelligent control and the like, thereby being quite promising in application prospect.

The invention relates to a method for dredging and management and ait construction, which belongs to the techniques of environment protection and hydraulic engineering. The method comprises the following steps of: protecting dikes along both shores of a river by a light and hard shell dike method; arranging a nose dike in the middle position of the gradually-wide section of the river along the upstream end of a longitudinally ridged sand sill; according to the shape of the sand sill, hard shell sheet piles gradually extending to the downstream along both sides of the nose dike to form an aequilate river surface; inserting sheet piles, connecting the sheet piles into a whole, throwing the dredged mud into a range surrounded by the hard shell sheet piles, and then gradually forming a man-made island; marking a helix-shaped man-made bay on the downstream of the gradually-narrow section of the river to form a fixing sand point on the sudden-widen river; and then planting and fixing sand on the man-made island. The invention aims to satisfy the functions of flood discharge, tide suppressing, irrigation, water storage and navigation, and also can establish stable man-made islands and marsh parks. The invention has the advantages of dike stabilization, reduction of sand accretion, utilization of natural energy, and increase of earth resources, and is suitable for various types of river management.

The invention provides a comprehensive treatment method for restoration of gangue hill ecological environment. The method specifically comprises the following steps of carrying out gangue hill slope cutting, shaping and fire extinguishing engineering, carrying out enclosure and isolation engineering, carrying out soil covering engineering, carrying out semi-flexible rapid drainage system engineering, carrying out nutrient soil construction engineering, carrying out anti-erosion vegetation restoration engineering and carrying out vegetation maintenance system engineering. According to the method, through reasonable gangue hill slope cutting and a semi-flexible rapid drainage system, a gangue hill can be ensured to be safe and stable; through gangue hill fire extinguishing and enclosure andisolation, the damage to the gangue hill can be thoroughly eliminated; through scientific and reasonable soil improvement through soil exchange, vegetation can grow fast and permanently; through an anti-erosion vegetation restoration technology, the erosion of wind and rain to a side slope can be resisted; and a reasonable vegetation maintenance system is designed, so that the problems of vegetation irrigation and fertilization of the side slope of the gangue hill can be solved, and water and soil loss of the side slope of the gangue hill can be prevented. The method has the advantages that acombination of measures are taken from the seven key points, so that the damage of spontaneous combustion of the gangue hill to the environment can be avoided, a plant community can be quickly formed,and the restoration of the mine ecological environment can be realized.

The present invention relates to a preformed liner adhered to the surface of a pipe, and in particular, an oil well pipe, by an adhesive. The liner comprises a polymer, preferably a fluoropolymer. The present invention also relates to a process for adhering the preformed liner to the interior surface of a pipe, and in particular by applying adhesive to the preformed liner. The liner is preferably treated prior to applying the adhesive. A suitable treatment includes etching. The pipe is heated to adhere the preformed liner to the interior surface of the pipe, without buckling the liner. The interior surface of the preformed fluoropolymer liner reduces the deposition of at least one of 1) asphaltenes, 2) paraffin wax, and 3) inorganic scale by at least 40% as compared to the interior surface of the oil pipe without the preformed liner being present.

The invention discloses a filter device for livestock and poultry breeding wastewater and a method adopting the filter device. An outer filter screen and an inner filter screen of the filter device are both cylindrical and are tightly attached and nested to form a double-layer filter screen. A backwash device is used for washing filter residues adhered to the top of the double-layer filter screen, multiple circles of filter holes are formed in the outer filter screen and the inner filter screen in a surrounding manner, and overlapping areas of the filter holes in the two layers of filter screens have regular changes when the outer filter screen rotates relative to the inner filter screen; an upper sewage sump is arranged in the inner filter screen and used for collecting the filter residues washed off by the backwash device at the upper part; a water inlet and an upper sewage draining port connected with the upper sewage sump are formed in a first sealing plate; a water collecting tank is arranged below the double-layer filter screen and used for collecting wastewater after filtering. The double-layer filter screen adopting the cylindrical and tightly attached and nested filter screens is used for filtering the livestock and poultry breeding wastewater, so that the size of filterable particles is adjusted, and adaption to fluctuation of the particle size of solids in the livestock and poultry breeding wastewater is realized.

The invention discloses an electromagnetic shielding waterborne paint and a preparation method thereof, which belong to the field of electromagnetic shielding paints. The paint consists of the following components in percentage by weight: 30 to 50 percent of emulsion, 10 to 30 percent of flaky metal powder, 0.5 to 2 percent of dispersant, 0.2 to 1 percent of wetting agent, 0.5 to 3 percent of leveling agent, 0.5 to 1.5 percent of antifoaming agent and 25 to 40 percent of water. The preparation method comprises the following steps of: stirring and dissolving the dispersant, the wetting agent and a part of antifoaming agent in deionized water; mixing the flaky metal powder in solution and stirring at a high speed; adding the emulsion into the mixture, stirring and mixing; and adding the leveling agent and the remaining antifoaming agent into the mixture and stirring. The paint of the invention can achieve the shielding efficiency of between 60 and 85 dB in the frequency range of between 100 kHz and 1.5 GHz; and an obtained coating has basically invariable surface resistivity after being stored in a natural state for more than 6 months and is suitable for building systems and other electromagnetic protection systems with environmental protection requirements.

A selective hydrogenation catalyst for pyrolysis gasoline. The catalyst mainly consists of a support of delta, alpha mixed alumina covered by palladium and alkali metal and / or alkaline-earth metal which are distributed on the support surface, and the support has 0.5 to 09. ml / g of specific pore volume. 40 to 200 Å pores account for more than 85% of the total pore volume. The specific surface area is 70 to 140 m2 / g, and alpha crystal structure in the alumina support is 0.5 to 5% based on the weight percentage of delta, alpha mixed alumina support. The catalyst includes palladium in amount of 0.05 to 0.4 wt %, alkali metal and / or alkaline-earth metal in amount of 0.05 to 2.0 wt %.

The present invention relates to the process of a system of pipes that convey any flowable medium, such as chemicals, food and in particular, oil and gas, and more particularly to a system of pipes having different coatings or linings for the interior and exterior surfaces of such pipes, depending on the environment in which the pipes are used. The pipes may be coated with different materials, which may be of different thicknesses, with various configurations of coatings or linings. Such coating may be done on the interior and / or the exterior of the pipes.

Hyaluronic acid-retaining biopolymer is provided which exhibits low levels of protein adsorption and surface friction. The biopolymer is useful for incorporation in products, such as contact lenses, used in biological environments.

The invention relates to a microbial water-purifying agent and a preparation method thereof. The microbial water-purifying agent is prepared by fermenting corncobs, sugar cane residue, wheat bran, rapeseed meal, zeolite powder, potassium dihydrogen phosphate, sodium chloride, light calcium carbonate, water and liquid strains in a fermentation bin. The preparation method of the microbial water-purifying agent comprises the following steps: firstly, crushing the corncobs into particles with diameters smaller than 5 mm; proportionally adding and mixing the sugar cane residue, the wheat bran, therapeseed meal, the zeolite powder, the potassium dihydrogen phosphate, the sodium chloride and the light calcium carbonate; adding 25 percent of water; sending the mixture to an air steamer; adding high-pressure steam to the air steamer to increase the air pressure to 1-2 MPa and the temperature to 140-200 DEG C; keeping the pressure for 4-6 minutes; momentarily releasing the mixture in the air steamer; sending the mixture to the fermentation bin so that the temperature falls to 30-37 DEG C; then, inoculating 3-5 percent of strains; fermenting in the fermentation bin for 72 hours; and discharging from the bin to obtain a finished product. The product has good water-purifying effect, and air-steamed stalks are culture media for strain growth as well as excellent vectors. The invention can prepare strains by strains, stimulate the mass propagation of microorganisms to form dominant strains and have the yield-improving efficiency.

The invention discloses an industrial plant heating and dustless and volatile organic chemicals (VOCs) near zero emission process, which substantially comprises steps: (1) VOCs in industrial plants is collected by utilizing a gas collecting system, and waste gas is collected; (2) the waste gas which is collected in the step (1) is conveyed to a waste gas treatment device, and the VOCs is treated; and (3) gas which is treated in the step (2) is conveyed to plants through a gas send-back system, and is recycled. The industrial plant heating and dustless and volatile organic chemicals (VOCs) near zero emission process enables plants not to have dust and heating, and enables VOCs to be discharged near zero or at zero.

The invention relates to a method for leaching earthy oxide copper ores, in particular to a method for microorganism-pelleting heap leaching, and belongs to the technical field of hydrometallurgy. The method is characterized in that: the earthy ores are directly screened, and fine ores with the granularity of 1.5mm are added with strain acid water and cement to prepare ore pellets with the diameter between 10 and 20 mm for heap leaching, wherein the mass concentration of sulphuric acid in the strain acid water is 3 to 10 percent, strains are mixed strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, the mass ratio of the three is 4.0-5.5:2.5-3.5:1.5-2.5, the bacterial load ratio is 105 and 108 / ml, the cement amount is 15 to 30kg / ton of ores; and leachate in the leaching is sprayed for closed cycle production. The method has the advantages of low investment, low energy consumption, good leaching effect, and no discharge of closed cycle, solves the problem of leaching the low-grade earthy oxide copper ores (including sulphide and oxide blend ores) by microorganism heap leaching, and overcomes the defects of long flow and high cost of agitation leaching.

A diversion work for river gate dams and spillways comprises an integrated platform made of two segments; wherein, the inside wall of the first segment platform is an circular conical surface; the outside wall is a circular cylindrical surface; both the top face and the bottom face are planes; the inside wall of the second segment platform is a torsion face, and the outside wall is a tangential plane against the circular cylindrical surface of the first segment platform; both the top face and the bottom face are also planes. In installation, the tail of the transition torsion face of the second segment platform is tangentially connected with side walls of an inlet side hole on a river gate dam or a spillway. The diversion work can effectively resolve the problem of transiversal shrinkage of water flow in front of inlets of the river gate dam and the spillway. To further improve water flow status, it is necessary to add a vertical guide dam; one end of the vertical guide dam is linked to the tail of the transition torsion face of the second segment platform; the other end is connected with the side wall of the river gate dam or the spillway inlet side hole. In a plurality of projects, the first segment platforms can be extended to connect with the bank, for which the surrounded lands can also be utilized for other purposes.

The invention relates to a developing and governing method for a sandy wide channel canal / shoal / pool. A narrow river channel is formed by two main dikes (new flood dikes) which are constructed between the prior flood dikes at two sides of a sandy channel segment along the riverway trend, and large dams are constructed at the upstream and the downstream. A water supply and sand diversion canal is constructed at the inside or outside of at least one of the main dikes in the narrow river channel. A conveyance and navigation canal is constructed outside one or two sides of the narrow river channel. The conveyance and navigation canal is adjacent to the water supply and sand diversion canal or the conveyance and navigation canal, or the conveyance and navigation canal is a split type. The bottomland and the pool surrounded by the diking are changed from the shoal area between the main dike or canal dike and the prior flood dikes. The bottomland can be a permanent site for living, production, construction and development. The long-term reserved pool is capable of storing water resource and supplying water in non-flood season, storing floodwater and replenishing dryness in flood season, and detaining and storing the flood. The developing and governing method for the sandy wide channel canal / shoal / pool effectively prevents from flood, treats and uses slit, ensures the security in flood prevention, and supplies enough rinsing water source; the water service cost is low, and the method is capable of developing and utilizing the resources such as hydraulic power, shipping, and tourism, etc. in the channel segment, and the method has a positive meaning in improving environment.

The invention discloses a physical sewage treatment system used for sewage treatment from the source, comprising a solid-liquid separation device and a settling device. The solid-liquid separation device is provided with a solid-liquid separator, and a separation water inlet, a separation water outlet and a separation sewage discharging port of the solid-liquid separator; the settling device comprises a settling shell the bottom of which is provided with a settling sewage discharging port, a water inlet hose and a water outlet hose are arranged in the settling shell, the water inlet end of the water inlet hose is connected with the separation water outlet of the solid-liquid separation device, the water outlet end of the water inlet hose is connected with a hollow floating disk, the outline of the floating disk adapts to that of the cross section of the settling shell, and a plurality of through holes are uniformly distributed in the annular area of the bottom surface, close to the edge; a floating disk water outlet is arranged on the bottom of the floating disk and is connected with the water inlet end of the water outlet hose, and the water outlet end of the water outlet hose extends out of the settling shell. The sewage treatment system can be used for treating sewage timely from the pollution sources, thus reducing or avoiding the phenomenon that sewage enters public water body.

The invention discloses a full-automatic silt separation device which relates to a full-automatic mechanical device which automatically separates silt brought by water current in a water passage or a silt sedimentation tank in time and automatically adjusts the desilting flow rate in time. The device is composed of a desilting throttle disc or a desilting throttle block which is arranged in the water passage, under a desilting port at the bottom of the silt sedimentation tank, or in a desilting passage, an automatic regulating device which is linked with the desilting throttle disc or the desilting throttle block by a transmission component or an electric circuit and arranged in the desilting passage connected with the desilting port, a power plant, an electric component and the electric circuit, etc. The device not only can automatically separate the silt brought by water current by means of own structure in time, but also can automatically adjust the desilting flow rate in time according to the content of the silt, thereby being capable of completely separating the slit brought by water current under the condition of controlling the desilting flow rate to be in minimization.

The invention discloses a method for draining roof water in a flood mine, which comprises the following steps: before a working face is mined, firstly constructing drainage ditches in a track lane and a belt lane and forming water storage drilling pits at intervals; forming a hydrophobic channel parallel to the belt lane below the belt lane, arranging a water-coal body separation facility at the tail end of the hydrophobic channel, forming through eyes at intervals in the middle of the belt lane, communicating the belt lane with the hydrophobic channel through the through eyes, forming a water retaining structure at the through position, then forming drainage boreholes in a coal seam roof in the track lane at the upper part and the belt lane at the lower part and pre-draining the roof water; and mining the working face while the roof water is pre-drained and enabling muddy water generated by the working face to enter the hydrophobic channel from the through eyes till to flow into the water-coal body separation facility. The flood mine roof water drainage method has the benefits that two hydrophobic purification channels, i.e. a pre-draining channel and a working face water-coal body channel are designed aiming at the water abundance of the roof water and are not mutually affected in the drainage, and working face coal mining and drainage are synchronously performed.

The invention discloses an ecological floating island for remediation and treatment of black and odorous water. The ecological floating island comprises a floating base, a net-shaped cylinder base, a floating ball, a balance frame, a steel wire rope and a fixing rivet, the net-shaped cylinder base is welded with the bottom of a purification base, and the floating base is fixed to the junction of the purification base and the net-shaped cylinder base and located on the outer side wall of the purification base; a driving motor is installed in a top protrusion of the purification base, and one end of a rotary shaft extends to the bottom of the net-shaped cylinder base and is provided with a rotary rack; the balance frame is installed at the bottom of the rotary rack, the steel wire rope is connected with the center of the bottom of the balance frame, and the fixing rivet is fixed to one end of the steel wire rope. According to the ecological floating island for remediation and treatment of the black and odorous water, by installing the floating base, the purification base and the floating ball and forming ecological planting grooves, the black and odorous water can be effectively adjusted through the rhizomes of aquatic plants, floating objects on the surface of the water can be effectively collected through the floating island, and the area of the purified water is increased. The problems are solved that a traditional sewage purification device is single in function, small in purification area, long in treatment time, low in purification speed, high in maintenance cost and the like.

The invention relates to a full-coverage reflection-type high-power complete uniform light collection photovoltaic power generation device, which solves the problems of the prior solar power generation device such as low uniform light collection efficiency, high cost, complicated structure and unstable output voltage. The device comprises an photovoltaic cell component, a reflector component and asupport component, wherein the support component comprises a sun tracking device; the photovoltaic cell component comprises a cell support and a rectangular photovoltaic cell component which is fixedon the upper end of the cell support; and the reflector component comprises for reflector groups which are symmetrically distributed on the periphery of the lower end of the battery support. The whole surfaces of the photovoltaic cells are uniform in light acceptance. The device has the advantages of high light collection efficiency, low cost, simple structure, low energy consumption, low pollution and easy cleaning.

The invention discloses a porous floating breakwater. The porous floating breakwater comprises a plurality of breakwater units connected in sequence, wherein each breakwater unit comprises a first buoyancy tank, a second buoyancy tank, connecting rods and two vertical plates, the first buoyancy tank and the second buoyancy tank are rigidly connected through the connecting rods and are connected with an anchoring balancing weight through an anchor chain for anchoring, the two vertical plates are fixedly mounted on the connecting rods, water holes are formed in both vertical plates, and aperture ratio of the water holes in the vertical plates is 9%-11%. The porous floating breakwater is good in wave dissipating effect, small in structure stress, good in safety, simple in structure, convenient to construct and wide in applicable range and has important actual significance in wave resistance of port engineering.

The present invention provides a busway and belongs to the field of power transmission equipment. The busway comprises busway units. The busway unit includes a housing, a first conductor group and a second conductor group which extend along a first direction; the housing comprises two clamping assemblies; the two clamping assemblies are respectively used for clamping and fixing the first conductorgroup and the second conductor group; the housing further comprises two partitioning components; the partitioning components are located between the two clamping assemblies; the two partitioning components are arranged at intervals on one end of the clamping assemblies and the other end of the clamping assemblies respectively, such that the two clamping assemblies and the two partitioning components enclose a heat dissipating passage extending along a second direction; the housing also comprises two cover plates which are arranged parallelly and spaced apart along the second direction; the cover plates are respectively connected to the two clamping assemblies; and first heat dissipation holes aligned with the heat dissipation passage are formed in the cover plates. The busway also comprises a temperature and humidity control system that automatically detects temperature and humidity inside the busway and adjusts the temperature and humidity through a fan, so as to improve heat dissipation and safety.

The disclosure relates to compositions comprising at least one of Active Compounds and Botanical Powders and a Delivery System, wherein at least a portion of the Botanical Powders are encapsulated in the Delivery System. Furthermore the present disclosure relates to a method for preparing compositions with reduced sedimentation of the Botanical Powders, and a Delivery System, wherein at least a portion of the Botanical Powders are encapsulated in the Delivery System. Furthermore, the present disclosure relates to compositions with reduced sedimentation comprising Botanical Powders, and a delivery system, wherein at least a portion of the Botanical Powders are encapsulated in the delivery system, for use in Cosmetics.

The invention provides a composition containing aqueous nonionic polyurethane dispersions. The composition is prepared from, by weight, (a) 0.1-30 parts of aqueous nonionic polyurethane dispersions, (b) 10-30 parts of a dirt removing surface active agent, (c) 0.01-5 parts of a conditioner and (d) a water containing carrier, and all parts are added to reach 100. The composition is used as a hair washing agent, hair can be natural and tough, and the fluffy state lasting time of the hair can also be prolonged.

The invention discloses a preparing method for a sandy soil solidification agent. The preparing method includes the steps that argillaceous silty-fine sand is preheated and dried to be put into a calcining furnace, and the obtained product is calcined for 2 hours at the high temperature of 1,050 DEG C to 1,150 DEG C, then is rapidly cooled (time when the obtained product is cooled to the room temperature is not more than 1 hour), and then is ground to 200 mesh to 300 mesh ready for use; the prepared calcined-argillaceous-silty-fine-sand fine powder, mineral powder and cement are weighed according to the weight percentage of the calcined-argillaceous-silty-fine-sand fine powder to the mineral powder to the cement of (70%-80%):(5%-10%):(10%-25%) to be mixed evenly, and the sandy-soil-solidification-agent finished product is obtained. The preparing method for the sandy soil solidification agent has the advantages that a raw material can be obtained locally, the transportation cost is saved, the argillaceous silty-fine sand of the middle and lower reaches of the Yellow River is reasonably used, and sedimentation of the middle and lower reaches is also be slowed down; the preparing method is simple, green, capable of saving energy and environmentally friendly; the solidification agent prepared with the method and medium fine sand in sedimentation mud sand can also be blended in proportion to be made into a prefabricated product, and good social benefits and economic benefits can be generated through comprehensive utilization of the raw material.

The present invention is related to a selective hydrogenation catalyst for pyrolysis gasoline, wherein the catalyst mainly consists of a support of delta, alpha mixed alumina covered by palladium as active component, promoter as co-active component and alkali metal and / or alkaline-earth metal. Said palladium is distributed like egg shell on the support surface. Said support has 0.5~0.9 ml / g of specific pore volume, wherein 40~200 Å pores account for more than 85% of the total pore volume, preferably 100~200 Å pore volume accounts for 65%~80% of the said total pore volume in catalyst support. The specific surface area is about 70~140 m2 / g , and a crystal type in the alumina support is about 0.1~5% based on the weight percentage of delta, alpha mixed alumina support, said catalyst contains promoter having selected from a group of the VIB or IB elements in the periodical table of elements. The ratio of promoter and palladium by weight is about 0.2~2:1. The alkali metal and / or alkaline-earth metal is added in amount of 0.05~2.0 wt %.

The invention discloses an alcohol-free offset-printing fountain solution. The alcohol-free offset-printing fountain solution comprises an acidifying or alkalizing agent, carboxymethylcellulose sodium, a surfactant, an eco-friendly solvent, an anti-corrosive agent and ion exchange water. The alcohol-free offset-printing fountain solution has following beneficial effects: by redesigning the formula of the fountain solution, an alcohol-free offset-printing processing solution comes into being in order to reduce waste and improve the environment; no harm is caused to a worker's body; and potential safety hazards are eliminated.

The invention relates to the field of sewage treatment and aims to provide a spheroidal composite adsorbent for sewage treatment. The spheroidal composite adsorbent is prepared from 8-10 parts of lignin, 6-9 parts of sulfydryl modified polyacrylamide, 2-3 parts of sodium alginate, 30-40 parts of sulfydryl modified quartz sand and 20-30 parts of sepiolite. The spheroidal composite adsorbent has thefunctions of adsorbing and removing organic matter, suspended matter and heavy metals in sewage, and has the good removal effect on the heavy metals in the acidic sewage and has the integrated effectof adsorption, flocculation and sedimentation, the contents of COD, SS, lead, cadmium, copper and mercury in treated river channel sewage all reach the stipulations of national standard surface waterenvironmental quality standard GB3838-2002 of the People's Republic of China, and the removal rate of heavy metals in acid heavy-metal heavily polluted wastewater reaches 99% or above.

The activated sludge new technique for reducing residual sludge comprises: adding the sludge and sewage into aeration pond for continual aerating; depositing in deposition pond, and reflowing the sludge to aeration pond; when the sludge concentration over given value, reflowing part sludge to aeration pond and discharging other out; putting decouple agent into the aeration pond as sludge ratio, then aerating with sewage, and leading the decoupled mixed liquid into deposition pond; taking anoxybiotic treatment to some sludge in storage container for 4~6h and reflowing to aeration pond for aeration and decoupling with sewage. This invention can reduce 40-50% residual sludge with small investment and simple device.