1674results about How to "Avoid clogging" patented technology

Described are improvements to the structure and functionality of a reduced pressure adapter used to connect a distribution manifold and a reduced pressure source instrumentation in a reduced pressure wound treatment (RPWT) system. The reduced pressure adapter reduces instances of unintentional liquid ingress into ancillary lumens of a reduced pressure delivery tube, while channeling the liquid to a primary lumen of the reduced pressure delivery tube.

An image forming apparatus according to the present invention, for ejecting liquid from openings to form an image on a printing medium, includes a head cap for covering the opening surface where the opening is open when a liquid ejection head in which the opening is formed are not in use and for protecting the opening from external air, a rechargeable battery for activating the image forming apparatus, a fuel cell for charging the rechargeable battery, and a liquid path along which water generated as the fuel cell is activated is introduced into the head caps. With this arrangement, when the liquid ejection head is not activated, the moisture retention in the head caps can be achieved.

The invention relates to a repairing system for a double-layer permeable reaction wall. The repairing system is composed of a reduction reaction wall and an oxidizing reaction wall, wherein the reduction reaction wall is located at the upstream of water flow; the oxidizing reaction wall is located at the downstream of the water flow; the reduction reaction wall and the oxidizing reaction wall both have frame box structures; netted articles are arranged on two front sides of the frame box vertical to the flowing direction of underground water and two lateral sides parallel to the flowing direction of underground water; modified zeolite and zero-valent iron powder are filled in the netted articles of the frame box of the reduction reaction wall and are filled to be at the altitude higher than the water line of the underground water; and active oxidants, stable curing adhesives, and slow-release grains formed by mixing zeolite with water are filled in the netted articles of the frame boxof the oxidizing reaction wall and are filled to be at the altitude higher than the water line of the underground water. The repairing system for the double-layer permeable reaction wall provided by the invention has the integrated functions of activating reduction and autocatalyzed oxidation, and is used for realizing the high-efficient removal of nitrobenzene pollutants in the underground water.

The invention discloses a lithium metal negative electrode for a secondary battery. The lithium metal negative electrode comprises a three-dimensional porous current collector, a lithium metal activesubstance dispersed into pores of the current collector, and a lithium deposition induction layer compounded on any plane of the current collector. Furthermore, the invention further discloses a preparation method and application of the negative electrode, and a lithium-ion secondary battery obtained through assembly of the negative electrode. The lithium metal negative electrode has the unique advantage that the lithium deposition induction layer is deposited on one plane of the current collector, so that unexpected improvement of the stability, especially the stability at high current density (for example, 3-5mA/cm<2>), of the negative electrode is facilitated. According to the method, the problems of pore plugging and lithium dendrite growth caused by preferential deposition of lithiumon the surface of the electrode in the three-dimensional porous lithium negative electrode are effectively solved, the charge-discharge coulomb efficiency of a lithium positive electrode is improved and the cycle life of the lithium positive electrode is prolonged.

The invention provides a biologic filtration method and a device for purifying industrial organic waste gas, which has high efficiency, less investment, low running cost and extensive application range of equipment. The method comprises the following steps: (1) the industrial organic waste gas is sprayed and processed in a spraying tower with a tap water spraying system to remove solid particles; (2) the waste gas enters a biologic trickling filtration tower filled with a biologic filler filled with a composite material for carrying out biologic filtration; inorganic salt nutrition liquid and active sludge which are stored in an aeration tank are evenly sprayed into the biologic trickling filtration tower by a pipeline and a spraying device, and the industrial organic waste gas is adsorbed, absorbed and degraded biologically by a biologic film attached to the surface of the biologic filler and the active sludge from the aeration tank; and (3) the industrial waste gas after being purified is discharged from a waste gas discharge port at the top of the biologic trickling filtration tower, and the active sludge is recirculated into the aeration tank for recycle after being regenerated. The invention has higher processing effect to various industrial mixed organic waste gases and wide application range, and the processed industrial mixed organic waste gases can reach the national emission standard or the emission standard of a manufacturer.

The invention discloses a preparation method of coffee ground activated carbon. The preparation method comprises the steps of pretreatment, degreasing, dipping, activization, washing and the like. Firstly, vacuum pyrolysis degreasing is performed on coffee grounds to remove grease in the coffee grounds and carbonization is performed to obtain a precursor of the coffee grounds; then phosphoric acid is taken as an activating agent for dipping and ultrasound at different dipping ratios (the mass ratio of the phosphoric acid with the precursor of the coffee grounds); activating under different vacuum conditions after drying; the effect of the activation conditions of activation final temperature, vacuum degree, heating rate, activation time, the dipping ratio and the like on the performance of the coffee ground activated carbon is overall considered, the prepared coffee ground activated carbon is high in yield, and the iodine adsorption value and methylene blue adsorption value are both above the state first level activated carbon standard (the iodine adsorption value is 1000mg/g and the methylene blue adsorption value is 135mg/g); the coffee ground activated carbon can be used for adsorbing hazardous gas such as formaldehyde in a room after decoration, and is an air purification material with a very good adsorptive property; the whole carbon preparation process has the advantages that the blockage of coffee ground activated carbon pores caused by the coffee ground grease is avoided, the working state parameters are stable, green and environmental protection and non-pollution are realized, and is simple and feasible.

The invention relates to a high-strength high-modulus graphene/nylon 6 fiber and a preparation method, and belongs to the field of high-strength fibers. The high-strength high-modulus graphene/nylon 6 fiber is prepared by polymerizing modified graphene and caprolactam in situ through high-speed melt spinning. A graphene/nylon 6 nano-composite material is prepared by compounding the modified graphene, the caprolactam and various auxiliaries. The melt index of the graphene/nylon 6 nano-composite material ranges from 15 to 25 (2.16kg, 25 DEG C), and continuous high-speed spinning can be realized by melt spinning holes. The obtained graphene/nylon 6 nano-composite fiber has excellent mechanical properties, tensile strength is higher than 8.0cN/dtex, initial modulus is higher than 9GPa, and the graphene/nylon 6 nano-composite fiber can be used for the field of national defense and industry of tire cords, industrial fabrics, fishing nets and cables.

The invention provides an efficient pollutant intercepting device for a gutter inlet. The efficient pollutant intercepting device comprises a box body (7), wherein the upper edge of the box body (7) comprises a retainer which comprises a turnup (8); the box body (7) comprises side surfaces and a bottom surface; the box body (7) also comprises a handle (9); a pollutant intercepting mesh (10) is arranged at the inner side of the box body (7); a filler (5) is loaded between the sides surfaces of the box body (7) and the pollutant intercepting mesh (10). The efficient pollutant intercepting device for the gutter inlet is capable of intercepting pollutants going into the gutter inlet such as leaves, paper scraps and cigarette butts, and preventing the gutter inlet and a pipeline from being blocked; particles in the primary rainfall runoff are removed through a filter material filled in the space reserved at the four sides of the device; when the volume of runoff is large, rainwater is capable of directly going into the bottom space of a gully trap via a filter screen in stead of the filter material layer.

The invention discloses a filter and a laser printing manufacturing method and application thereof. By the adoption of a laser printing method, the structure of the filter is not limited by technological conditions any more, filters of any structures can be manufactured, and filters with complicated curved surfaces and complicated pores can be directly manufactured. Because the laser printing method is used for manufacturing, the number of filtering layers of the filter will not be limited, and filtering pores in the filtering layers can be designed to be gradient holes; polluted fuel is in contact with the inner filtering layer firstly; large pollutants are intercepted by large filtering pores, and small pollutants are intercepted by small filtering pores; the intercepted pollutants slide to the lower end along the filtering pores, so that layered filtering is achieved; in this way, the filtering effect is improved, and the filtering pores are prevented from being blocked; and the service life of a filtering element is greatly prolonged, and the filter manufactured according to the laser printing manufacturing method can be designed at will according to actual requirements to meet use requirements.

In a slide bearing assembly 12 comprising a shaft 22 and a bushing 16 which is made of a porous sintered material having a large number of pores 25, the bushing 16 is impregnated with a lubricant 24 containing 2.0 to 30 wt % of solid lubricating fine particles 26 made of at least one selected from among MoS₂, WS₂, and hexagonal BN, and the shaft 22 and the bushing 16 are used at surface pressure not lower than 6 Kgf/mm² and sliding speed in the range of 2 to 5 cm/sec. This realizes prolongation of a period during which sliding operation can be continued in an oilless self-lubricating state even under a situation of sliding at a very low speed or angular motion in a very small stroke.

The invention discloses terminal equipment, a core network server, a service converging system and a service converging method. The terminal equipment comprises a communication module, a first processing module, a determining module, a first sending module, a second sending module and a service converging module, wherein the communication module is used for intercommunicating with other terminal equipment; the first processing module is used for processing a service request and dividing the service request into at least one sub service request according to the service property; the determining module is used for acquiring terminal capability information of other terminal equipment through the communication module and determining destination terminal equipment according to the terminal capability information; the first sending module is used for sending the service request to the core network server; the second sending module is used for sending the sub service request to the destination terminal equipment; and the service converging module is used for receiving sub service contents sent by the destination terminal equipment and converging and generating service contents corresponding to the service request according to the sub service contents. The service converging mode can meet the requirement of a user for services.

The invention discloses a reversible short lane signal control method based on intersection vehicle in-turn release. According to the method, four inlets in the east, south, west and north at an intersection are respectively provided with one segment of reversible short lane by utilizing opposite lanes, four outlet lanes are respectively provided one set of reversible short lane indicating lamps, right sides of stop lines of the four inlets are respectively provided with one set of left turning pre-signal lamps, main signal lamps at the intersection employ a clockwise or anticlockwise in-turn release four-phase mode for all vehicles at each inlet lane, phase difference between the main signal lamps and the left turning pre-signal lamps is set, and the reversible short lane indicating lamps and the left turning pre-signal lamps realize simultaneous conversion; phase difference between main signals and left turning pre-signals is coordinated, public period duration and green light distribution time are calculated, conflicts between a left turning traffic flow and an outlet lane traffic flow are controlled in the time aspect, left turning traffic flow jam caused by improper time distribution is avoided, inlet and outlet land resources are fully utilized, the lane number of inlet lanes is enhanced, and passing capability of the intersection is improved.

The invention provides a preparation system for waterproof paint, belonging to the technical field of paint processing equipment. The preparation system comprises a frame, a mixing drum, a stirring device, feeding barrel assemblies, connecting arms, an inclined feeding plate and a feeding linkage control mechanism. The preparation system has the beneficial technical effects that the preparation system can control simultaneous addition of a variety of ingredients, realizes uniform dispersion and mixing of the various ingredients during filling of materials, allows a finished product to have high quality, and avoids the phenomenon of material blockage. The mixing drum is fixedly arranged on and connected with the frame; the lower end of the mixing drum is provided with a liquid discharging pipe which has a control valve; the upper end of the stirring device is arranged on the frame, and the lower end of the stirring device is located in the mixing drum; four feeding barrel assemblies arearranged and evenly around the stirring device; the four feeding barrel assemblies are all located above the mixing drum; the four feeding barrel assemblies are in transmission connection with the frame; and four feeding barrel assemblies are all fixedly connected with the inclined feeding plate through the connecting arms.

A method and device for controlling the pain of a periodontal ligament injection, and other minor medical and dental procedures. The device desensitizes the tissues utilizing cold, vibration, or both. The method is useful for injections, small biopsies, intraosseous drilling, blood sampling, and so on.

The invention discloses an electric conduction type crankcase ventilation pipe. The ventilation pipe comprises a sealing pipe and quick-fitting joints arranged at the two ends of the sealing pipe; twoguide wires are arranged on the outer side of the sealing pipe; the quick-mounting joints at the two ends are provided with microswitches which are positioned on the inner walls of insertion holes respectively and circuit boards connected with the microswitches, and the two ends of the two guide wires are connected to the circuit boards at the corresponding ends to form a conduction loop; and thecircuit board at one end is further connected with an external electrical plug, and the electric plug is used for being connected with an automobile master control ECU so as to output on-off signals.According to the electric conduction type crankcase ventilation pipe, the wires, the microswitches, the circuit boards and the electric plug are arranged and connected to the automobile main controlECU, after an automobile is started, whether the crankcase ventilation pipe is in a conduction state can be monitored online, so as to ensure that combustible gas separated by an oil-gas separation system in a crankcase can smoothly enter an air inlet system of an air cylinder for re-burning, so that emission of harmful gas is further reduced, and pollution to the atmosphere is reduced.

The invention discloses a microfluidic chip, a whole blood hemocyte separation system based on the chip, a preparation method of the system and a method for separating whole blood hemocytes by using the system, is used for separating the hemocytes, can overcome the defects of low separation efficiency and insufficient miniaturization and lightweight in the prior art, and meets on-site real-time blood sample separation requirements. The chip is prepared by successively bonding a substrate layer containing a main flow channel structure with a microporous filter membrane layer and a flexible polymer layer containing an upper-layer flow channel structure, and a micro-channel system is formed in the chip; the micro-channel system includes a micro-pump area, a circulation area, a first channel, a second channel, a third channel, and a filtering area formed by the main flow channel structure, the microporous filter membrane layer and the upper-layer flow channel structure.

The invention provides an in-furnace oil tar self-stripping type organic solid fuel gasification device and method. The device comprises a feeding device, a gasification device, a gasification gas fly ash cyclone separation device or a fly ash separation filtering device, a condensing device, a condensate water evaporation device, a gasification medium preheating device, an ash residue discharging device and a gas storage tank, wherein organic solid fuel is added from a feeding opening, and enters the gasification device through a two-stage sealing feeding valve; the organic solid fuel in the gasification device is firstly subjected to drying, pyrolysis, gasification and combustion reaction; gasification gas and ash residues are generated. The in-furnace oil tar self-stripping type organic solid fuel gasification device and method provided by the invention have the advantages that a good oil tar removal effect can be achieved; the coking wastewater zero discharge is realized; the gas quality can also be optimized in the process; the energy source efficiency is improved; the operation cost is reduced.

The invention provides a filter capable of automatically cleaning a rotary filter element, which consists of accessories such as a filter body (3), a filter element (17) with a hollow shaft, a bearing (8), a sealing element (6), a rotary joint, a cleaning roll brush (10), an electropneumatic valve (4), a drain pipe (5), an electric cabinet (1), an electric motor (16), a coupler (15), an overflow device (9), a liquid inlet pipe (11), a stander (2), a belt (13), a big belt pulley (14), a small belt pulley (12), a steel framework (20), a steel wire gauze and a filter material (18). The filter element (17) with the hollow shaft can effectively prevent impurities at one side of the filter element (17) with the hollow shaft from being absorbed and accumulated under dual actions of back flushing of cleaning liquid under the action of a centrifugal force and cleaning of the external surface of the filter element by the cleaning roll brush. The filter has the advantages that the filter can prevent a passage of the filter element from being blocked, can clean the filter element automatically, can discharge pollution by automatic timing, reduces cost for replacing the filter element, and saves expenses.

The invention discloses a high-efficiency anti-clogging sewage treatment device, comprising a casing, an upper cover is arranged on the upper end of the casing; the upper cover is provided with a water inlet pipe, a ceramic passing bush, a first motor, a rotating rod and a rotating wheel , traction rope, transmission shaft and second motor; a partition, a first filter cavity and a second filter cavity are arranged in the casing; a filter box and a first filter screen are arranged in the first filter cavity; There is a second filter screen in the hole; the second filter cavity is provided with an annular chute, a movable ring, a sewage outlet, a sealing arrangement plate, a filter element and a water outlet; the movable ring is provided with sliding protrusions, internal gears, moving gears, fixed Rod, swing rod and metal bristles. The invention adopts the first motor to drive the traction rope, the filter box and the first filter screen to filter and prevent blockage; the second motor drives the movable ring to swing, so that the metal bristles move to clean the impurities of the second filter screen; the water body finally passes through the filter element. Obtain filtered and drained.

The invention discloses a purifying device of backwash, aeration type hidden flow marshland water body and a method of purifying water body, wherein the whole purified pool display cube box; the separating pool separate the pool as downward pool and upper pool; the filling base material pack evenly in the pool; planting amphibious plant on the upper; setting cloth water pipe on the upper of the upper pool; making the upper of adjusting pool higher than purifying pool; setting inlet pipe and water-feed pump on the one side of the adjusting pool; setting admitting pipe and admitting pipe on the upper of the upper pool; setting aeration machine on one side of the purifying pool. The invention possesses high load factor, small plot area and good treatment effect, which can improve treatment effect.

The invention relates to a ball serving device, and particularly relates to a table tennis ball serving device for sports training. The invention aims to solve a technical problem of providing a tabletennis ball serving device for sports training which is simple in structure, capable of adjusting the serving angle and convenient for training. The technical scheme is that the table tennis ball serving device for sports training comprises a base, annular sliding blocks, supporting legs, a u-shaped frame, a first cylindrical body, a first sliding block, a push plate, a feeding hopper, a first spring, a rack and the like; the top of the base is provided with an annular sliding slot at the middle, the annular sliding slot is internally provided with two annular sliding blocks, the top parts ofthe annular sliding blocks at the left and right sides are provided with the supporting legs, and the u-shaped frame is installed between the top ends of the left and right supporting legs. The tabletennis ball serving device for sports training can drive the supporting legs to rotate under the action a speed reduction motor so as to adjust the angle of the first cylindrical body and adjust theserving angle, can push a table tennis ball in the frame body to fall into the first cylindrical body for serving through a ball pushing device, and prevents the table tennis ball from falling into the frame body and being not served.

The invention relates to a completed well body structure with a temporary plugging function screen pipe and a well completion method for injecting cement on the top. The well body structure comprises a multifunctional well washing valve, a screen pipe, a blind plate, a pipe external isolator and a grading cement injector which are sequentially connected from bottom, top to a well opening; the screen pipe with the temporary plugging function is adopted, and each through hole of a center pipe of the screen pipe is provided with a plugging cover. The well completion method comprises the following steps of: firstly, constructing a pipe string of the well body structure with the temporary plugging screen pipe, taking the pipe string to the position by a tool, carrying out slurry replacement by reverse circulation, opening the well washing valve under the action of pressure and establishing a circulating passage; after the slurry replacement is finished, throwing a ball into the pipe string, pressing the pipe external isolator, continuously pressurizing, opening the grading cement injector and carrying out top cement injection well fixing operation; putting a drill down to drill the blind plate and the plugging cover of the screen pipe; and putting into production. The invention can solve the problem of slurry cake plugging in the process of putting down the screen pipe, greatly simplify the traditional well completion slurry replacement operation way, reduce the drill-down frequency, save the operation time and improve the replacement efficiency.

The invention discloses an unattended parking lot automatic control and charging system and method. The system comprises a ground sensor, a control unit, a license plate identification unit and a communication unit. The license plate identification unit is respectively connected with the ground sensor and the control unit, and the control unit is connected with the communication unit. According to the scheme provided by the invention, registration is unnecessary for a user, when license place identification fails, during entry, a person in a vehicle just needs to make a phone call or send a message to a first number so that entry information can be bound to a mobile terminal, and the person does not have to open a vehicle window for obtaining a card or inputting a number. When the person is about to take back his car and leave a parking lot, such information as entry time and a needed parking fee and the like can be pushed to the user by use of the bound mobile terminal, and payment can be completed; or when the person is about to go out of a gate, he obtains the pushed information such as the entry time, the parking fee and the like by dialing the first number or sending a message to the first number by use of the bound mobile terminal so that unattended intelligent self-service fee payment is realized.

A mortar and debris collection device for use within a cavity wall to prevent the blockage of weep holes at the base of the wall. The cavity wall assembly includes a masonry wall, an adjacent inner wall, a wall cavity therebetween, and a free-standing elongate strip of openwork material located within the cavity forming a debris collection surface a spaced distance above a base surface of the cavity. Preferably, the openwork material is inserted and positioned within the cavity after the inner wall and only a base portion of the outer masonry wall is constructed. Thereafter, the upper portion of the outer masonry wall is constructed and any mortar or debris falling into the cavity is caught and supported on the debris collection surface.

A recycling treatment system for tannery wastewater is fixed between a sequencing batch reactor (SBR) and filter press equipment, and the recycling treatment system contains: a first ultrafiltration unit, a second ultrafiltration unit, a cation exchange unit, an osmosis processing unit, a recycling tank, a RO concentration tank, and an evaporation unit. The first ultrafiltration unit includes a filtering tank, a plurality of ultrafiltration sets with plural first ultrafiltration bags and a fluid tube. The second ultrafiltration unit includes a concentration tank, at least one rotary ultrafiltration assembly, a backwash pipe, and a discharge pipe. The cation exchange unit includes a reaction sink and cationic resin. The osmosis processing unit includes plural first reverse osmosis sets and plural second reverse osmosis sets. The RO concentration tank is mounted beside the osmosis processing unit, and the evaporation unit is configured between the RO concentration tank and the recycling tank.

The matrix composition recipe for sewage treating artificial wet land includes basic matrixes for all kinds of water quality and optional matrixes for special water quality. The basic matrixes are mixed sand and soil and crushed stone; and the optional matrixes include zeolite, limestone, coal slag, steel slag, furnace slag, crushed stone, haydite, melon seed piece and pebble. The total height of the basic matrixes and the optional matrixes is 0.6-1.2 m. The present invention determines the matrix composition recipe of sewage treating artificial wet land according to the characteristic pollutant in the sewage to be treated and has raised sewage treating efficiency of artificial wet land, no jamming, reduced covered land area and low cost.

The invention discloses a mudstone environmental protection regeneration system. The mudstone environmental protection regeneration system comprises a feeding mechanism; the feeding mechanism comprises a stock bin, a vibrating feeding machine, a crushing mechanism which comprises a jaw type rough crushing machine and a hammer type fine crushing machine, a sand and gravel separating mechanism, a gravel fine separating mechanism and a mud and sand water passing mechanism; the sand and gravel separating mechanism comprises a rough separating vibrating screen; the rough separating vibrating screen comprises a gravel layer and a mud and sand layer; the gravel fine separating mechanism comprises a fine separating vibrating screen; the fine separating vibrating screen comprises a multi-layer finished product layer and a fine sand layer; the mud and sand water passing mechanism comprises a spiral conveyer; other devices except the spiral conveyer is provided with a spraying water pipe respectively. The mudstone environmental protection regeneration system can crush and clean gravel residues containing soil to enable the gravel residues to be recycled and has huge economic benefits and a remarkable environmental friendly effect.

Disclosed is a hair care appliance comprising a body, a fluid flow path extending through the body from an inlet through which a fluid flow enters the appliance to an outlet for emitting the fluid flow from a front end of the body, and an attachment for adjusting at least one parameter of fluid emitted from the appliance, the attachment comprising an upstream end for attaching to the appliance, wherein one or both of the front end of the body and the upstream end of the attachment comprises at least one magnet. The front end may comprise an end wall extending radially inwards of the body and comprising the at least one magnet or a plurality of magnets radially spaced about the end wall or a ring of magnetic material extending around the end wall. The upstream end may comprise a plurality of magnets radially spaced about an end face.

The invention discloses a traditional Chinese medicine crushing and screening device. The device comprises a base plate, a box, a collecting frame, a motor, crushing blades, a screen, a crankshaft, afirst belt wheel, a second belt wheel, a belt connector, a spiral pipe, a second connecting rod shaft neck, a second sleeve, a second connecting rod, a piston rod and a piston. The device is providedwith the motor, the crankshaft, a first connecting rod shaft neck, a first connecting rod and the screen for cooperation to drive the screen to move left and right so as to improve the screening efficiency, and is provided with the second connecting rod shaft neck, the second sleeve, the second connecting rod, the piston, a cylinder block and the spiral pipe for cooperation to continuously suck air into the cylinder block from an intake pipe; then, the air enters the spiral pipe from an exhaust pipe, and is sprayed out from an air spraying hole to intermittently blow traditional Chinese medicines on the screen to the crushing blades; the traditional Chinese medicines are crushed again through the crushing blades to improve the crushing efficiency; and meanwhile, the traditional Chinese medicines blocked in meshes of the screen can be blown off to prevent blockage of the meshes of the screen, so that the screening efficiency is further improved.

The invention relates to a separate two-phase anaerobic fermentation fermentation device, including a hydrolysis acidification reaction device, anaerobic fermentation device, biogas treatment device and biogas slurry oxidation device, wherein: the hydrolysis acidification reaction device includes at least two parallel hydrolysis acidification reaction devices The hydrolytic acidification reaction tank and the hydrolyzate collection tank of the unit; the anaerobic fermentation device is a closed anaerobic digestion reactor, with a feed inlet at the bottom and a biogas output outlet at the top, and a set at 80%-90% of the total height There is a biogas slurry overflow port; the biogas slurry oxidation device is a biogas slurry oxidation pond, and the biogas slurry oxidation pond is equipped with a baffle plate that is dislocated up and down; the volume ratio of the hydrolytic acidification pond, anaerobic digestion reactor, and biogas slurry oxidation pond is 2~5:1:0.2~0.5.