522 results about "White water" patented technology

A process according to the present invention for production of water-absorbable polyacrylic acid resin powder, including: (a) polymerizing an acrylic acid-based monomer aqueous solution containing bubbles, and (b) drying a hydrogel crosslinked polymer thus obtained in the step of polymerizing, further includes (c) lowering solubility of dissolved gas in a monomer aqueous solution in the presence of a surfactant and / or a dispersing agent, so as to generate the bubbles in the acrylic acid-based monomer aqueous solution. With this arrangement, it is possible to provide white water-absorbable resin with better water absorbing rate, keeping or without significantly losing the other properties (permeability potential, bulk specific gravity, surface tension, absorbency against pressure, impact resistance, etc.)

A sizing composition for reinforcement fibers that includes one or more film forming agents, a silane coupling agent package, and at least one lubricant surfactant is provided. Optional components such as rheology modifiers, fillers, biocides, and pH modifiers may also be included. Preferred film forming polymers are amide-based polymers. Additionally, the sizing composition is free of polyvinyl alcohol. The absence of polyvinyl alcohol in the size composition reduces or eliminates the production of precipitates from white water in wet-laid processes. The size composition is applied to reinforcement fibers and formed into chopped strand, wet-laid mats that can be used for a variety of purposes, including roofing products. Chopped strand mats formed from fibers sized with the inventive sizing composition maintains or improves the dry tear and tensile strengths compared to chopped strand mats made from fibers sized with a commercial sizing composition that does not contain polyvinyl alcohol.

Wet-laid chopped strand glass mats for use in roofing applications that have improved hot wet tensile strengths are provided. The chopped strand mats are formed by the application or inclusion of at least one coupling agent to the chopped strand mat during a wet-laid mat forming process. The coupling agent may be added to the chopped strand mat as part of a two-part binder composition that includes a binder and at least one coupling agent. Alternatively, the coupling agent may be added directly to the chopped strand mat independent of the binder. As a further alternative, the coupling agent(s) may be added to the white water in the wet-laid mat forming process and incorporated into the formed glass mat via the glass fibers. The binder may be a modified urea-formaldehyde binder, a non-modified urea-formaldehyde binder, and / or a formaldehyde-free binder. The coupling agent(s) may be silane coupling agents and / or reactive siloxanes.

A water sculpture is provided having a an upwardly inclined flow surface. A flowing body of water is caused to flow upon the flow surface simulating various desired wave shapes. A variety of aesthetic wave shapes can be created, such as an unbroken wave face, a white water bore, a spilling breaking wave, or a tunnel wave. In one embodiment a walk-through water sculpture is provided such as for an entranceway of a building or the like.

The present invention discloses a modified calcium sulfate crystal whisker papermaking filler, a preparation method and applications thereof, wherein a modified calcium sulfate crystal whisker papermaking filler is prepared, and then the modified calcium sulfate crystal whisker papermaking filler is applied in papermaking industry. The application of the modified calcium sulfate crystal whisker papermaking filler in the papermaking industry comprises: 1) selection a papermaking slurry, (2) use of the modified calcium sulfate crystal whisker papermaking filler and related auxiliary materials, 3) papermaking, and 4) white water circulation. According to the present invention, the calcium sulfate crystal whisker raw material source is wide, conditions are wide, and solid waste pollution can be effectively solved; the modified calcium sulfate crystal whisker product has characteristics of high whiteness, low abrasion, effectively-controlled solubility, high papermaking retain rate, and low white water load, the problem of pipe scale is eliminated, and the product can completely replace calcium carbonate, kaolin, talc powder, and other papermaking fillers, and partial plant fiber raw materials; and the method has characteristics of low equipment investment, simple modification process, strong operability and low cost, and is applicable for large scale production.

A substantially rigid or semi-rigid chair suitable for white-water use with a hydrodynamically efficient underwater profile, capable of efficient human propulsion, using hands and / or legs, which supports the user in a semi-reclining position and which is sufficiently maneuvrable, in both forward and reverse direction, to enable the user to engage in white-water river use. In one embodiment, the chair consisting of two floats (2, 3), rigid / semi-rigid seat base (4), bow hull floor section (12) an adjustable seat back (8) and a waterproof covering (7). The floats (2, 3) are separated by a rigid / semi-rigid central section (15) comprised of the seat base (4), bow hull floor section (12) which extends from the bow (6) for a majority of the chair's length, and together with the seat back (8) providing a semi-reclining body position enabling the user to use hands and / or legs for propulsion / maneuvring.

The invention discloses a method for preparing a modified calcium sulfate crystal whisker papermaking filler. The method is characterized by comprising the following steps of: (1) calcining a crystal whisker; (2) performing organic dissolution restraint modification; (3) drying; and (4) grinding for flocculation elimination. In the method, the used calcium sulfate crystal whisker has a wide raw material source and a wide condition, and can effectively solve the problem of solid pollution caused by various industrial gypsum waste residues or metal waste residues; the prepared modified calcium sulfate crystal whisker filler has the characteristics of high whiteness, low abrasion, high retention rate and the like and can effectively replace the conventional calcium carbonate fillers or plantfibers; simultaneously, the solubility of the prepared modified calcium sulfate crystal whisker filler is effectively controlled, and the filler is easy to disperse in papermaking aqueous pulp, so that the problems that the calcium sulfate has high water solubility and has a low retention rate, high content of white water waste ions, high possibility of scaling in a pipeline and the like when used as the papermaking filler are solved, the application field of the crystal whisker is expanded, and the additional value of the crystal whisker is improved.

Disclosed is a method for controlling microbial growth in an aqueous system containing sulfite and / or bisulfite residues by addition of a peroxy compound at a pH of greater than 5. Also disclosed is a method for stabilizing an active halogen biocide in an aqueous system containing peroxide residues by addition of an N-hydrogen compound to the active halogen biocide before combining it with the peroxide containing aqueous system. Further disclosed is an optimized papermaking biocide program consisting of initially treating sulfite bleached pulp with peroxide followed by application of an N-hydrogen-stabilized active halogen compound to the paper producing white waters and an analytical method for determining peroxide concentrations in aqueous systems in the presence of sulfite and / or bisulfite.

The invention relates to a treatment method for paper-making white water, which comprises: treating residual white water with superficial air-float technique and with polyaluminium chloride and strong-cation polyacrylamide as flocculant and coagulant by special proportion to make SS of out water about 10mg / L and turbidity not larger than 15NTU and become primary recycling water, ultrafiltrating to remove all SS with turbidity not larger than 1NTU, and obtaining super recycling water. This invention can realize zero-discharge of paper-making white water in deed.

The invention discloses a metal cold forming water-based lubricating agent which comprises the following components in percentage by weight: 71%-88% of water-based stearate, 1%-5% of a silane coupling agent, 0.1%-0.3% of an auxiliary lubricating agent, 0.5%-2% of a dispersing agent, 0.2%-0.5% of an antirusting agent, 0.1%-0.5% of a defoaming agent and 5%-27% of water, wherein the content sum of the components is 100%. The metal cold forming water-based lubricating agent disclosed by the invention has the advantages of safety, environmental friendliness and good lubricating effect. The preparation method of the metal cold forming water-based lubricating agent comprises the following steps: adding the water to a reaction kettle; sequentially adding the dispersing agent, the silane coupling agent and the water-based stearate under mechanical stirring; stirring for 10-20 minutes, and then adding the auxiliary lubricating agent; then stirring at a high speed for 20-60 minutes by utilizing a pipeline type shearing machine to completely emulsify and disperse materials inside the reaction kettle; and finally adding the defoaming agent and the antirusting agent, and mechanically stirring for 5-10 minutes to obtain the white water-based lubricating agent. The preparation method disclosed by the invention has the advantages of simple process flow and easiness for operation.

An on-line automated analyser of macrocontaminants is described. The analyser is for a pulp and / or a white water stream, the analyser comprises: a pulp classifier separating a sample from the stream into a fraction of macrocontaminants; a contaminant chamber enclosing a contaminant cell receiving the fraction; an optical chamber comprising an optical detector connected to the cell capturing at least one detected image; and a control chamber taking the at least one detected image and conducting an image analysis to determine type and quantity of at least one macrocontaminant in the fraction. The method of analysis of macrocontaminants is also described herein, the method comprises: separating a sample from the stream into a fraction of macrocontaminants; producing at least one detected image by optical measurement of the fraction; and analysing the at least one detected image and determining the quantity and type of at least one macrocontaminant in the fraction.

The invention discloses cationic polymer grafting modified nanocrystalline cellulose which comprises nanocrystalline cellulose, nonionic monomer used for forming a macromolecule carbon skeleton, and cationic monomer used for introducing positive charge. The nanocrystalline cellulose, the nonionic monomer and the cationic monomer are triggered for copolymerization through free radicals to form a nanocrystalline cellulose cluster, the nonionic monomer is chosen from acrylamide, N, N-dimethyl acrylamide, N, N-diethyl acrylamide, N-vinyl formamide and acrylonitrile, and the cationic monomer is chosen from dimethyl diallyl ammonium chloride, dimethyl amino ethyl acrylate, diethyl amino ethyl acrylate and methyl chlorine quaternary ammonium salt of dimethyl amino propyl acrylamide. The invention further provides application of the cationic polymer grafting modified nanocrystalline cellulose serving as a paper making additive to be added into a wet part of a paper machine so as to improve dry strength, wet strength and first-course retention rate paper or paperboards to lower white water concentration.

The invention relates to a chemical technology field, concretely, discloses high-hardness unsaturated polyester full-bright top-coat paint and a preparation method thereof. The priming paint contains a first component, cobalt isocaprylate (blue wate), methylethyl ketone peroxide (white water), and styrene, wherein the weight ratio of the first component, to cobalt isocaprylate (blue wate), to methylethyl ketone peroxide (white water) and to styrene is 100:(0.8-2):(1-2.5):(30-40). The high-hardness white unsaturated polyester priming paint and the preparation method resolve the problem that the PU polyurethane paint and nitro cellulose paint have bad hardness, the unsaturated polyester coating has high hardness, and simultaneously, the high-hardness unsaturated polyester full-bright top-coat paint has good fullness, clunging and minute surface effect.

The invention discloses a method for making slightly-coated elegant pure paper. The method comprises the following key steps of: making poplar APMP (alkaline peroxide mechanical pulp), CTMP (chemithermomechanical pulp), bleached chemical needlebush pulp and bleached chemical reed pulp; blending; adding auxiliary materials; making wet paper sheets; squeezing for dehydrating; primarily drying; slightly coating; secondarily drying; calendering; and finishing. The method can greatly lower the production cost, improve the looseness and thickness of paper sheets and ensure high strength of elegant pure paper, solves the problems that glues applied to AKD (alkyl ketene dimer) pulp have a low retention rate and are easy to be hydrolyzed, overcomes the defects of low fine fiber retention rate, high filler loss and the like in the highly-proportional chemimechanical pulp blending process, reduces the pulp consumption and lowers the white water load and subsequent waste water treatment cost, solves the problems of low whiteness, high surface roughness, low surface strength and the like due to the highly-proportional chemimechanical pulp, and can greatly increase the ash content and lower theproduction cost.

The invention provides a composite bactericide for paper making white water. The bactericide comprises the following components in percentage by weight: 0.9 to 2.7 percent of 5-chloro-2-methyl isothiazolizone-3-ketone, 0.5 to 1.5 percent of 2-methyl isothiazolizone-3-ketone and 5 to 20 percent of polyhexamethylene guanidine. After the bactericide is added into a white water system, various microorganisms in paper pulp and the white water system can be killed quickly, the formation of biological fouling in a circulating system can be restrained for a long time, slime pulp defects such as spots, pores, broken ends and the like caused by microorganisms on a paper sheet are effectively overcome, and machine halt vehicle brushing frequencies are lowered.

The invention provides a wet strength waste paper processing method belonging to the technical field of paper making. The method comprises the following steps of: by taking condensed water of steam of a drying part of a paper maker as a heat source, additionally providing a heat exchanger to increase the water temperature of white water for pulping from 30-35 DEG C to 60-70 DEG C; mixing with wetstrength waste paper in a pulper, and performing mild strength connection with softened fibers under a high temperature condition to easily separating the wet strength waste paper under mechanical functions. The specific processes and steps are as follows: (1) pulping; (2) grinding to form pulp; and (3) pulp proportioning to finish processing the wet strength waste paper. By adopting a heating processing method in the invention, the pulp processing time is shortened, electricity consumption during processing is reduced, the strength for breaking the fiber is reduced, the beating degree of the processed pulp is stable, and proportion of waste pulp in the blending can be properly increased as required, so that the production cost is reduced.

The invention relates to chicken meat emulsion products and a production method thereof. First, chicken meat emulsion is made, which has the main raw materials with the weight ratio: 55-65 wt% of chicken, 35-45 wt% of pork, 25-30 wt% of onion, 1-3 wt% of soy protein, 2-4 wt% of egg, 4-8 wt% of starch and multiple flavorings; the chopped chicken and pork are poured into a stirring mill and sequentially added with table salt, right amount of water, phosphate, the eggs, the soy protein and the onion, garlic, ginger powder, monosodium glutamate, white pepper powder and the starch to be evenly stirred at the low temperature of being below 4 DEG C, so that the chicken meat emulsion is prepared; then, fired chicken balls, white water chicken balls and chicken sausage can be manufactured. The invention expands the eating ways of chicken, and the chicken meat emulsion products are simple and convenient to eat and good in mouthfeel and quality structure so as to be suitable for various consumer groups; the invention is beneficial to the sale of chicken and plays the positive role in promoting poultry husbandry to stably and healthily develop in China.

The invention relates to a new method for preparing temperature-sensitive hydroxybutyl chitosan. A chitosan water solution is obtained by directly dissolving chitosan in an aqueous solvent at low temperature. The chitosan water solution further reacts with epoxybutane at room temperature. Inorganic components and unreacted impurities in a reaction solution are removed by dialysis, and white water-soluble hydroxybutyl chitosan can be obtained after freeze-drying. The derivative has the nature of being gelled when heated and being re-dissolved when cooled. Products with different phase transition temperatures can be obtained by controlling the feed ratio and reaction time. The hydroxybutyl chitosan prepared by utilizing the method has great water solubility. The preparation method is simple and easy to operate, the use of organic solvents can be avoided, and the reaction time can be greatly shortened simultaneously. As organic solvents are not used at all, the method has little influence on the environment. The hydroxybutyl chitosan prepared by the method provided by the invention can be used for the fields of medicament delivery, injection type tissue engineering scaffolds, bio-sensing and the like.

A paper preparing process includes steps of: providing softwood pulp and hardwood pulp and defibering the softwood pulp and the hardwood pulp respectively, wherein the absolute dry mass ratio of the hardwood pulp and the softwood pulp ranges from 1 to 4; filling softening agents into the defibered hardwood pulp; mixing the hardwood pulp filled with the softening agents and the defibered softwood pulp to obtain mixed pulp; and leading the mixed pulp to be subjected to papermaking to obtain paper. The paper preparing process can improve use ratio of the softening agents, reduce consumption of the softening agents and reduce the residual quantity of the softening agents in a white water system.

The invention discloses a method for controlling secondary stickies in paper pulp and white water during waste paper papermaking process through lipase. According to the invention, the pH (potential of hydrogen) value of lipase ranges from 7.5 to 9.0, the enzyme activity is larger than 100 U / mL, the hydrolysis rate for triglyceride is not lower than 95%, and transesterification and lipid synthesis rate of alkaline lipase is lower than 3%; a paper pulp processing method comprises the steps that lipase which is 0.001-0.5% of paper pulp dry weight is added into paper pulp with the pulp concentration which is adjusted in a range from 2% to 5%, and then the processed pulp is filtered, centrifuged and detected; and a white water processing method comprises the steps that lipase which is 0.001-0.5% of white water weight is added into papermaking white water for processing, and then the processed white water is filtered, centrifuged and detected. The method utilizes lipase to degrade the stickies thoroughly and reduce the deposition trend of the stickies, so that the removal purpose is achieved, and the problem of secondary sticky pollution is thoroughly solved; and the operation is simple, the removing effect is remarkable, the waste paper papermaking quality is improved, and the production cost is reduced.

Wet-laid chopped strand glass mats for use in roofing applications that have improved hot wet tensile strengths are provided. The chopped strand mats are formed by the application or inclusion of at least one coupling agent to the chopped strand mat during a wet-laid mat forming process. The coupling agent may be added to the chopped strand mat as part of a two-part binder composition that includes a binder and at least one coupling agent. Alternatively, the coupling agent may be added directly to the chopped strand mat independent of the binder. As a further alternative, the coupling agent(s) may be added to the white water in the wet-laid mat forming process and incorporated into the formed glass mat via the glass fibers. The binder may be a modified urea-formaldehyde binder, a non-modified urea-formaldehyde binder, and / or a formaldehyde-free binder. The coupling agent(s) may be silane coupling agents and / or reactive siloxanes.

The invention discloses a super breathable type deep-cooling heat-insulating material, which comprises alkali-free glass fibers and water spun glass fibers. A preparation method for the material comprises the steps as follows: adding the alkali-free glass fibers into white water, stirring to a suspended dispersion state, adding a mixed solution of the water spun alkali-free glass fibers and the white water, and continuing to beat; conveying formed slurry into a multi-pipe slurry distributor through a stainless steel screw pump, enabling the slurry discharged from the multi-pipe slurry distributor to enter a head box and naturally flow to a forming part so as to form a wet paper sheet, shaping the wet paper sheet through a press roll for the second time, and conveying the wet paper sheet into a natural gas tunnel type oven to obtain a rough blank; and cutting and winding the dried rough blank according to the required specification to obtain the required enhanced breathable heat-insulating material.

The invention discloses a treatment and recycling technology of white water in the production of a paper-making reconstituted tobacco. The technology comprises the following steps of: flocculating the white water at a wet part in a production process of the reconstituted tobacco substrate by adding in a flocculating agent, carrying out precipitation pretreatment, filtering clear white water pumped from a clear white water tank by using a multi-disc filter with a self-purification function, causing the ultra-clear white water after the filtration to be collected in an ultra-clear white water tank for storage to prepare for recycling, and returning the automatically discharged solid content in the filtration process to a tapered sedimentation tank. The technology is very applicable to the continuous treatment of the white water in the production process of the reconstituted tobacco substrate, free from back flush, low in treatment cost, good in treatment effect, and 70-80% in solid content removal rate, the ultra-clear white water after the treatment can completely replace clear water to be reused for screen washing, low-pressure spraying and screen edge sealing, the removed solid content dreg can be added into a slurry according to a proportion, waste water drain is reduced, environment protection pressure is relived, raw materials are saved, and economic benefit is obvious.

The invention belongs to a skin protection product in the field of cosmetics and in particular relates to skin energy activating sparkling essence. The skin energy activating sparkling essence comprises acrylic acid (acrylate) copolymer, butanediol, nicotinamide, lecithin, glucan, palmitoyl tripeptide-8, pseudoalteromonas fermentation product extract, glycerol, propylene glycol, sorbitol, panthenol, sodium hyaluronate, silver oxide and traditional Chinese medicine extract, wherein the weight percents of the components are 1-10%, 1-10%, 0.5-3%, 10-20%, 1-10%, 1-10%, 5-15%, 1-10%, 1-5%, 1-3%, 1-3%, 1-10%, 1-5% and 10-30% respectively; the balance is a solvent, and the solvent is deionized water preferably; and the traditional Chinese medicine extract contains common bamboo shoot extract, lotus flower extract and white water lily root extract. The skin energy activating sparkling essence has the effects of moistening and nourishing the skin, whitening and tendering the skin, cleaning pores, fading stains, sterilizing the skin and diminishing inflammation, detoxifying and protecting the skin as well as controlling oil and suppressing fat, and can effectively alleviate the problems, which are caused by water shortage of the skin, such as dryness, roughness, stains, fine wrinkles, lack of gloss and elasticity loss.

The invention provides a high-efficiency bactericide for papermaking white water, which contains 1.6-3.2% of 5-chloro-2-methylisothiazolin-3-one, 0.4-0.8% of 2-methylisothiazoline- 3-ketone, 20-40% dodecyl dimethyl benzyl ammonium chloride, 4.0-5.0% magnesium nitrate or magnesium chloride, this bactericide has good bactericidal effect and high chemical stability, it is added to papermaking white water Among them, it can inhibit the reproduction of microorganisms in papermaking white water and kill microorganisms. The killing effect on microorganisms in papermaking white water can reach 95-99.9%, so that repeated recycling of papermaking white water will not cause various paper problems due to microbial problems. The occurrence of diseases (broken paper, holes, needle holes, etc.).

The invention provides a papermaking sterilization preservative, which comprises the following components in percentage by weight: 5 to 25 percent of 2-thiocyanomethylthionbenzothiazole, 0 to 10 percent of dithiocyano-methane, 5 to 25 percent of polyhexamethylene guanidine hydrochloride, 3 to 6 percent of emulsifying agent and the balance of water and organic solvent. The papermaking sterilization preservative can be added into a papermaking white water system to play a role in killing microbes, inhibiting micro growth and propagation and eliminating interfering substances in the white water system so as to keep the clean state of the white water system, improve the cyclic utilization rate of white water and improve the production efficiency and the product quality.

The invention provides a method and a device for medium-consistency refining and pumping. The method comprises the following steps of: after low-consistency slurry is concentrated by concentration equipment, feeding the slurry into a medium-consistency vertical pipe to regulate the consistency; and after the consistency reaches a set value, pumping the slurry into a subsequent medium-consistency disk mill. The device comprises the concentration equipment, the medium-consistency vertical pipe, a medium-consistency pump, a slurry pipe and the medium-consistency disk mill which are connected in turn, wherein two white water pipelines on the medium-consistency vertical pipe are provided with a white water coarse adjustment valve and a white water fine adjustment valve respectively; a concentration meter connected with the white water fine adjustment valve is arranged on the slurry pipe; the concentration meter controls the opening of the white water fine adjustment valve in a PID adjustment mode; and a buffer segment is formed on the slurry pipe, wherein the pipeline length of the buffer segment is at least 2 meters; and the pipe diameter of the buffer segment is 2 to 3 times larger than that of the pipeline of a non-buffer segment. Compared with the conventional method for controlling and adjusting the pump output of the medium-consistency pump by using a liquid level, the device can stabilize the pump output flow better; simultaneously, the pumping potential of the medium-consistency pump is developed better, and the pumping consistency can be improved by 2 to 4 percent.

The invention discloses a dilution water hydraulic type flow box dilution water valve control device and a dilution water hydraulic type flow box dilution water valve control method. The dilution water hydraulic type flow box dilution water valve control device comprises a cross direction quantitative control computer, a dilution water valve control computer, a plurality of dilution water controllers and at most four dilution water valves connected with one dilution water controller, wherein the dilution water valve control computer obtains quantitative data of each area of finished paper from the cross direction quantitative control computer, and sends the quantitative data and auxiliary control signals to the plurality of the dilution water controllers through an RS485 bus, single chip computers in the dilution water controllers resolve respective operation tasks through internal cross direction quantitative control algorithms, valve opening degrees are adjusted, the dilution white water flow amount is adjusted, and then the cross direction fixed quantify in each area is adjusted, and therefore instantaneity is strong. According to the dilution water hydraulic type flow box dilution water valve control device, the single chip computers and step drive chips are arranged in the dilution water controllers, the single chip computers use multiplex PWM (pulse width modulation) ports to generate high speed pulse signals needed by controlling the step drive chips, and multiplex analog quantity ports are connected with angular displacement sensors so as to directly collect valve position signals.

The invention discloses a cultural method and device for common nostoc. The method comprises the following steps of: a, preparation of nostoc seed: collecting natural, wild and common nostoc; b, inoculation: uniformly spreading water white water retaining agent after being saturated by absorbing water onto a culture plate and spreading the nostoc seeds onto the water retaining agent after being saturated by absorbing water; c, preparation of a nutrient medium, wherein the nutrient medium is composed of three parts; d, control of a cultural process: controlling the periodic cycle of the nutrient solution in a natural light period and generating power by adopting a photovoltaic panel to drive a water pump, thus a nutrient salt solution periodically returns and flows; and e, harvesting: turning off a water pump, carrying out natural air drying, dehydrating and contracting thallus and harvesting the thallus. The culture plate is fixed by a fixed support, a water tank is respectively connected with a water pump and a shading shed by virtue of guide pipes, the water pump is connected with a water tank by virtue of a guide pipe, the water tank is respectively connected with the water pump and a water collecting tank by virtue of guide pipes, and the water pump is connected with the photovoltaic panel. The method disclosed by the invention can be used for solving the problems that in the traditional cultural method, nostoc grows slowly, the yield is low, the thallus is loose and the quality is poor.

The invention discloses a recycling technology of paper making white water, which comprises the following steps: A. disposing white water to remove most of fiber and impurity; B. transmitting supernatant in the disc-typed filter to obtain the outlet water as producing water in the paper making system; C. backwashing the disc-typed filter to obtain the backwashing water in the white water pool to dispose continuously.