33results about How to "Reduce sewage discharge" patented technology

The invention relates to a low-temperature scouring and bleaching assistant and a preparation method and application thereof. The low-temperature scouring and bleaching assistant is a mixed assistant formed by 25-60 percent by weight of low-temperature oxidation bleaching activating agent and 40-75 percent by weight of matched scouring agent, wherein the low-temperature oxidation bleaching activating agent consists of sodium nonanoyloxy benzene sulfonate, an activating agent promoter, a bleaching promoter and ammonium polycarylate; and the matched scouring agent consists of an emulsifying agent, a penetrating agent, a chelated dispersing agent, a defoaming agent and water. Cellulose fiber unfinished textiles treated by the low-temperature scouring and bleaching assistant have better whiteness, capillary effect, strength and hand feeling than the performances of textiles treated by the traditional process. Compared with the traditional method, the invention can effectively save the consumption of steam and power, reduce the treatment pressure of sewage and reduce the treatment expense of the sewage.

The invention relates to a method which separates a phenolic compound from raw oil containing phenol. Under a certain condition, the raw oil containing the phenol is mixed with saturated aqueous ammonia for reaction, the phenol and ammonia form ammonium salt which is dissolved in aqueous phase, the phenol is separated from the raw oil, and liquid is divided into two layers, that is, oil phase is separated from the water phase. Carbon dioxide directly enters into ammonium salt aqueous solution, the carbon dioxide reacts on ammonium salt, so that ammonia bicarbonate is formed, and crude phenol is dissociated. The method of the invention can improve the erosion of devices and discharge of sewage and reduce energy consumption, and operation is simple. The method of the invention is applied to producing crude phenol from all raw oils containing phenol.

The invention relates to a dyeing and finishing process of a pure-flax Huashu textile fabric, comprising the following steps of: singeing fabrics, stacking enzymes, oxidizing chlor-alkali, removing wax and crimples, dyeing, softening by AIRO air, shaping and ironing and finishing by steam. The pure-flax Huashu textile fabric not only maintains the original excellent characteristics of pure-flax fabrics, but also has good drapability, skin intimacy, low strength loss and high dye fastness, has the functions of shaping details and remembering small folds, eliminates itchy feeling and expands the use field of fabrics. The invention has reasonable process design, is environment-friendly and greatly reduces the use of energy and water resources.

Provided is an apparatus for producing reclaimed water based on electrolysis and double membrane technologies. The apparatus is disposed with an electrolysis system, an MBR system and a reverse osmosis system. Further provided is a method for producing reclaimed water using the apparatus, comprising the following steps: retrieving biochemical sewage through a water pump (12) and inputting the biochemical sewage into an electrolysis apparatus (13) of the electrolysis system to be electrolyzed, then enabling the sewage to enter an MBR reaction tank (26) through a grid (22) to obtain primary reclaimed water, pumping the primary reclaimed water into the reverse osmosis system with a high pressure pump (45) to separate dialysis water and concentrated water, enabling the dialysis water to enter a reclaimed water storage tank (48) to obtain ultrapure reclaimed water, enabling a part of the concentrated water to flow back for cyclic membrane filtering and separation, enabling a part of the concentrated water to flow back to enter an electrolysis procedure for cyclic use, and discharging the rest part of the concentrated water.

The invention discloses a trace amount of printing paste and a preparation method and application thereof. The printing paste is composed of liquid disperse dyes, a function prepolymer, a synthetic thickener, a functional addition agent and water. The trace amount of prepared printing paste can finish printing of a polyester fabric on a conventional rotary screen printing machine or a screen printing machine; high-temperature processing is performed through a tentering heat setting machine, the temperature is 180-210 DEG C, the time is 45-120 seconds, and a polyester printing fabric is prepared. The printing paste is used for printing and is characterized in that the printing process is short, the fabric is soft in touch, afttertreatment is not needed, plenty of water resources are saved, plenty of energy consumption is reduced, and there is almost no waste water emission. Processing devices are all conventional devices, and the preparation method is a green printing processing technology.

The invention belongs to technical field of textile assistants, and particularly relates to a textile cloth washing assistant and a manufacturing method thereof as well as a washing method using the same. The textile cloth washing assistant comprises the following raw materials in percentage by weight: 30-40% of high-concentration complex enzyme, 10-20% of surfactant, 45-50% of buffering agent and 0-15% of filler, wherein the high-concentration complex enzyme comprises neutral cellulase, desizing enzyme and softener. In the washing process, the effects of desizing, ferment grinding and softening processes can be reached only by the process of adding the washing assistant for washing in the washing process, and on the premise of the same washing effect, the water consumption is reduced from the original 5-7 times to 1-2 times, the water saving effect is very obvious, and the sewage discharge and the sewage treatment cost are reduced, so the comprehensive washing cost is greatly reduced.

A recovery and treatment system for culture waste water is disclosed. The system includes three staged precipitative filters, a microbe treatment tank, a plant treatment tank, an adsorption tank and an alga treatment tank. The culture waste water generated in a culture process flows through the first-stage precipitative filter, the microbe treatment tank, the second-stage precipitative filter, the plant treatment tank, the third-stage precipitative filter, the adsorption tank and the alga treatment tank in order and is treated. The treated water is reused for culture. The system is suitable for a factory-like aquaculture mode. The waste water generated in the culture process is subjected to biological and biochemical treatment and can reach water quality requirements on water used for culture, thus increasing the utilization rate of water and reducing the emission amount of the waste water.

The invention discloses an alkaline washing agent for CIP equipment in a dairy industry. The alkaline washing agent is prepared from the following raw materials in parts by weight: 20 to 55 parts of sodium hydroxide, 1 to 10 parts of potassium hydroxide, 5 to 20 parts of chelating agent, 0.5 to 3 parts of surfactant, 0.5 to 5 parts of sodium polyacrylate, 2 to 5 parts of water treatment agent and2 to 61 parts of water. According to the alkaline washing agent for the CIP equipment in the a dairy industry, one-step alkaline washing can be used for replacing acid and alkali washing and the frequency of acid washing can be reduced, so that the emission is reduced and the water consumption is reduced; the time and energy sources are saved; a washing process is more rapid and more environmentally friendly, and more energy is saved.

The invention discloses a method for performing durable flame-retardant grafting modification on fabric through cooperation of low-temperature plasma with electron beam irradiation. The method comprises steps as follows: firstly, the fabric is placed in a low-temperature plasma device for low-temperature plasma pretreatment; then the fabric is treated with a sodium hydroxide solution, and impurities such as colloid and the like in the fabric are removed; the fabric is taken out and fully washed with water, after residual sodium hydroxide is removed, the fabric is placed in an oven to be dried, and then the fabric is taken out and weighed; the dried fabric is soaked in a grafting monomer solution, then the fabric is taken out, the redundant liquid is rolled out by the aid of a padder, the fabric is wrapped with a plastic film and placed in a valve bag, and both the fabric and the valve bag are placed under a high-power electron beam for irradiation; after irradiation, the grafted fabric is washed with deionized water, and homopolymers and unreacted grafting monomers on the surface of the fabric are removed; then the washed fabric is placed in the oven to be dried for 24 h, and a product is obtained. The method has the advantages that the fabric has the lasting flame-retardant effect and the higher washing resistance.

The invention discloses an aluminium product polishing method. The method is characterized by comprising the following steps: I, preparing a chemical polishing solution comprising 3-12 parts of brightening agent, 3-12 parts of corrosion inhibitor, 20-65 parts of phosphoric acid and 25-75 parts of sulfuric acid by weight, wherein the total parts by weight is 100; the brightening agent comprises 1-4 butynediol and glycerin; and the corrosion inhibitor comprises phytic acid and polyphosphoric acid; II, heating the polishing solution to 85-120 DEG C; III, soaking a dry and clean aluminium product to be polished in the polishing solution in the step II for 20-240 seconds; IV, taking out the aluminium product in the step III and then washing the aluminium product with deionized water at 60 DEG C twice; and V, taking out and then blow-drying the aluminium product in the step IV.

The invention discloses a complex microbial inoculum for efficiently ungluing a bast fiber. A preparation method for the complex microbial inoculums comprises the following steps of: mixing a Bacillus amyloliquefaciens subsp. amyloliquefaciens DSM 7<T> suspension of which the age is 16-20 hours and a Bacillus subtilis subsp. Inaquosorum BGSC 3A28<T> suspension at the volume ratio of 3: 2; inoculating the mixed liquor into the following culture medium for joint culturing for 14-16 hours; filtering the culture solution through a 80-mesh filter; adding 12-18%(W / V similarly hereinafter) of porousstarch, 12-18% of beta-cyclodextrin, 0.1% of thiourea and 0.1% of povidone in the filtrate; and drying through spraying and adding tricalcium phosphate the weight of which is 5% of the total weight of the materials as a filler and vacuumizing to obtain the complex microbial inoculums. By using the complex microbial inoculums to unglue the bast fiber, the production cost is reduced, the product quality is improved, and the discharge and treatment of the high alkali wastewater are reduced radically and the complex microbial inoculum has a good economic prospect and high environmental benefit.

The present invention provides an anti-aging cerium-zirconium composite oxide. The cerium-zirconium composite oxide has a specific surface area of 80 m<2> / g or more, a pore volume of 0.55-0.80 ml / g, an oxygen storage capacity of 500-1200 [mu]mol O2 / g and two-pore group distributed apertures, wherein the diameter of the first pore group is concentrated at 3-10 nm, and the diameter of the second pore group is concentrated at 15-80 nm. The cerium-zirconium composite oxide provided by the invention has a significant anti-aging activity and a good low-temperature catalytic activity, and can be used for catalyzing hydrocarbons, carbon oxides and / or nitrogen oxides in mobile source exhaust gas. A preparation method of the cerium-zirconium composite oxide, provided by the invention, does not use a surfactant, and reduces sewage discharge, so the method is green and environmentally friendly; an ionic liquid and anhydrous ethanol can be recovered by simple distillation, so the cost is greatly reduced, and the method is particularly suitable for industrial production; and the composite oxide with uniform element crystal lattice doping distribution and no phase separation is obtained, so the preparation method is of great significance to study mobile source exhaust gas treatment purifiers containing the cerium-zirconium composite oxide.

The invention, belonging to the technical field of ammonia distillation reboilers, provides a device capable of effectively utilizing coke oven flue gas waste heat and simultaneously reducing waste water discharge capacity in the ammonia distillation process. The device is characterized in that a plurality of evaporation tubes are vertically arranged between an upper tube plate and a lower tube plate, one sides of the evaporation tubes are provided with flue gas inlets, and the other ends of the evaporation tubes are provided with flue gas outlets; the upper tube plate and the lower tube plate form a gas-liquid separation chamber, the top end of the gas-liquid separation chamber is provided with a plurality of a steam outlets, the side surface of the gas-liquid separation chamber is provided with a water inlet, and the central portion of the other side surface of the gas-liquid separation chamber is provided with an overflow gate; the lower tube plate and a lower shell form a water settling chamber, the bottom of the water settling chamber is provided with at least one sewage draining exit. According to the invention, a large amount of soft water and energy are saved, and the sewage discharge capacity is reduced.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing lidocaine through continuous reaction. According to the method, a continuous reaction method is adopted, crystallization, separation, purification and other treatment and drying processes of an intermediate chloroacetyl -2, 6-dimethylaniline are not needed, a lidocaine finished product can be directly obtained, and the molar yield is 93% or above. The process operation is simplified, the solvent is recycled, the sewage discharge amount is reduced, the production cost is reduced, energy conservation and consumption reduction are realized, and the process is green and environment-friendly.

The invention discloses building engineering sewage and sludge separating and recycling equipment which comprises a body. The body is provided with a tank structure, a feed inlet is formed in the topof the body, a filter plate, filter screens and a sewage drain system are sequentially arranged inside the body and are positioned below the feed inlet, an outlet end is arranged on the body and is positioned on the left side of the filter plate, a movable door is arranged at the outlet end, a sludge push mechanism is arranged on the body and is positioned on the right side of the filter plate, the sewage drain system is connected with a distillation chamber by a connecting pipe, a second electric heating block is arranged in the distillation chamber, and the upper side of the distillation chamber is connected with a liquid outlet by a condensation pipe. The building engineering sewage and sludge separating and recycling equipment has the advantages that liquid can be treated by the building engineering sewage and sludge separating and recycling equipment, and the problems of incapability of recycling liquid, poor separation effects, difficulty in collection and influence on the work efficiency of devices of existing equipment can be solved by the aid of the building engineering sewage and sludge separating and recycling equipment.

The invention discloses a method and a system for removing mercury through free radicals generated based on ozone / hydrogen peroxide. The method comprises the following steps that smoke exhausted by a combustor firstly passes through a smoke heat exchanger to be adjusted in temperature and then is introduced into a liquid phase reaction region of a reactor; ozone is injected into the smoke at a reactor inlet flue by an ozone injector; the ozone in the smoke contacts with hydrogen peroxide in a solution in a liquid phase reaction region to generate hydroxyl radicals to oxidize and remove an elementary substance mercury in the smoke, wherein a reactant is divalent mercury easily dissolving in water; after entering a primary mercury separation tower, a reaction solution generates a mercuric sulfide precipitate through reaction by adding sulfide and then is kept to be introduced into a secondary mercury separation tower for precipitation and separation. The method is capable of efficiently removing the elementary mercury in the smoke; equipment is simple and reliable, and free from secondary pollution in a removing process, thus the method and the system are novel smoke purifying method and system with wide application prospect.

The invention discloses a digital active wet process transfer printing method of a cellulose fabric. The digital active wet process transfer printing method of the cellulose fabric is performed by the five steps: manufacturing a special transfer printing medium; jet-printing a pattern; pre-processing a fabric; performing transfer printing; and performing post-finishing of the fabric. According to wet process transfer printing, by spraying a pre-processing liquid, the fabric is dyed and fixed in color in a clinical water content stat when fibers are subjected to maximum swelling without taking urea as a moisture absorbent, and the fabric is not padded and pasted, so that the washing difficulty is reduced, and sewage discharge is reduced. The method disclosed by the invention not only has the advantages of clear and smooth digital inkjet printing pattern and rich layers of picture, but also has the characteristics of efficient production of conventional transfer printing and environmental protection and energy conservation, and further has the characteristics that the active print is bright in color, excellent in hand feel, good in color fastness and healthy and comfortable.

A device for sewage treatment and regenerative recycling, comprising a biochemical system, an electrolysis system, an MBR system and a deep processing system. A method for sewage treatment and regenerative recycling comprises the following steps: (1) biochemical treatment; (2) electrolysis; (3) MBR system filtering; (4) capacitance desalting and sterilization; (5) sludge treatment. The device and method can overcome the defects in the existing sewage regeneration technology such as that the quality of the regenerated water is poor, it is difficult to meet the water quality requirements for water consumption, the investment is large, the operation cost is high and the secondary pollution to the environment is caused. The sewage discharge can be reduced. The utilization efficiency of water is improved. Meanwhile, the regeneration and recycling of sludge are realized and the harm possibly caused by the sludge to the environment is eliminated.

The invention discloses a wastewater recycling device applied to a common bathing pool hot water boiler. The wastewater recycling device comprises a framework, wherein the framework is fixedly arranged on the ground, a coarse filtering box is arranged above the framework, a fine filtering box is arranged under the coarse filtering box, a sterilizing box is arranged under the fine filtering box, asewage storage tank is arranged outside the framework, a controller is arranged on the framework, a signal receiving end of the controller is electrically connected with a first water level sensor, asecond water level sensor and the sterilizing box, and a power output end of the controller is electrically connected with a first electromagnetic valve, a second electromagnetic valve, a sewage pumpand the sterilizing box. The wastewater recycling device disclosed by the invention has the beneficial effects of simple structure and high practicability.

The invention relates to a technique and a system device for regenerating exhaust gas denitration catalyst, and belongs to the technical field of exhaust gas processing of coal-fired power plant. The processing steps includes cleaning the denitration catalyst in a recirculation state and performing activation and dehydration on the denitration catalyst in the recirculation state. The detergent is composed of polyacrylic acid, nonylphenol polyoxyethylene ether, fatty alcohol-polyoxyethylene ether and sodium ascorbate; temperature is controlled at 40 DEG C; the activate fluid is composed of oxalic acid, ammonium metavanadate, ammonium metatungstate; and methane acid used for controlling PH value is 1% wt. The processes of soaking, cleaning, activating, dehydrating and the like for regenerating catalyst are integrated to implement in one container or two, so that volume of regeneration system is remarkably reduced, regeneration procedure and operation steps are simplified, energy consumption is reduced by 50%, and air pollution caused by exhaust gas is avoided.

The invention discloses a rainwater collecting and recycling method. The method comprises the steps as follows: a roof rainwater collecting system and a ground runoff rainwater collecting system are used for collecting rainwater into a buried reservoir; a rainwater monitoring sensor is mounted on a roof and a water level sensor is mounted in the buried reservoir; the buried reservoir is communicated with a sedimentation tank, and sedimentation is realized through fiber reinforced plastic grids and high-speed sand filtration in the sedimentation tank; polymeric aluminum chloride and polyacrylamide are added to the sedimentation tank for coagulation; primarily filtered water is delivered into a restroom of a building through a domestic water delivery pipe to flush a toilet; secondarily filtered water flows into a fish pond through a pipeline for fish culture; water discharged from the fish pond is used for irrigating planted plants through a water distribution pipe; the pipeline is connected with a plant planting area, biological filtration is performed on water obtained after irrigation, and the filtered water flows back to the fish pond through a pipeline. The use cost is low by use of recycled rainwater, recycling of rainwater contributes to improvement of the ecological environment, and virtuous cycle of water ecology is realized.

The invention relates to the field of rubber product preparation, and discloses a condensation method for a styrene thermoplastic elastomer solution, which comprises the following steps of sequentially sending a heterogeneous mixture into a first condensation kettle and a second condensation kettle to remove a solvent. The post-treatment circulating hot water B and steam are subjected to first heat exchange to obtain superheated water and first steam condensate water, the superheated water is fed into a first condensation kettle from the bottom of the first condensation kettle, and the heterogeneous mixture is obtained by mixing the post-treatment circulating hot water A and a styrene thermoplastic elastomer solution. According to the method provided by the invention, steam does not completely enter the condensation kettle any more, but exchanges heat with part of circulating hot water, so that the circulating hot water is changed into superheated water to enter the condensation kettle, the condensation effect of the condensation kettle is ensured, meanwhile, the sewage discharge capacity is reduced, the environmental protection requirement is met, and the subsequent sewage treatment cost is reduced.

The process of treating waste from printed circuit board production and reusing resource includes the following steps: 1. neutralizing waste acid and alkaline etching solution, pressure filtering to obtain copper, treating pressure filtered waste liquid with ozone, purifying the treated waste liquid, and regulating the components to obtain new etching solution; 2. crushing and separating PCB leftover to obtain copper-rich resin and burning at high temperature to obtain copper oxide; and 3. producing stuffing for adhesive and binder with glass fiber resin obtained through separating the crushed PCB leftover. The present invention makes it possible to reduce pollution and lower PCB producing cost.

The invention provides a method for preparing a new type of production equipment for nylon-coated wire, including a pay-off rack, a grinder, a coating machine, an extruder, a traction roller, and a wire take-up machine; The surface of the iron wire is polished by friction, and the cloth is wiped to make the iron wire brighter, which saves water resources and reduces sewage discharge compared with traditional technology, and meets the requirements of environmental protection. At the same time, the cost of stone and cloth is low, reducing The cost of sewage treatment is reduced, and the production cost is saved.

The invention discloses a silk / wool fiber dyeing method and a post-dyeing sewage treatment device thereof, and the method comprises the following steps: pre-drying silk / wool blend fibers, and then carrying out plasma pretreatment; dyeing the wool in an acid bath; dyeing silk in an alkaline bath; soaping under a weakly alkaline condition, and then washing with water; the treatment device comprises a treatment pond, a plurality of water flow channels are formed in the treatment pond, a plurality of water treatment assemblies perpendicular to the flowing direction of water flow are rotationally connected into the water flow channels, the water treatment assemblies are partially exposed out of the water surface, a filter plate is arranged below the water flow channels, and an air flotation device is arranged below the filter plate; a slag scraper is arranged between the filter plate and the water flow channel, a plurality of scraping plates are arranged on the slag scraper, V-shaped hooks are arranged at the bottoms of the scraping plates, and bristles are arranged at the ends of the V-shaped hooks. The method has the characteristics that the dyeing cochromaticity of the silk / wool mixed fiber is improved, the sewage discharge amount is reduced, and the pollution to the environment is reduced.

The invention relates to a colored velvet cold-pad batch decolorizing method, and belongs to a pretreatment process technology of textile printing and dyeing. By changing a colored velvet decolorizing process route and a preparation method of a decolorizing solution and performing cold-pad batch decolorizing on colored velvet by use of a solution prepared by mixing high-proportion ethanol and a little water with a decolorizing reagent, strength damage to the colored velvet can be effectively reduced in a decolorizing process, the pigment solubility is improved, and the decolorizing difficulty is reduced; meanwhile, the water consumption and sewage discharge are reduced to a great extent, the quality of the colored velvet is improved, and the quality is good and the efficiency is high. The cold-pad bath decolorizing technology provided by the invention is simple and convenient and realizes a good decolorizing effect and high efficiency; through recycling of an alcohol organic solvent, the burden of sewage treatment on an enterprise is remarkably reduced; the cold-pad bath decolorizing technology is a clean production technology conforming to the environmental protection requirement, and has remarkably high social and economic benefits.

The invention discloses a method for extracting hesperidin. The method comprises the following steps: (1) crushing; (2) impurity removal: putting the immature bitter orange powder into an extraction tank, adding a sodium carbonate solution, stirring to remove impurities, and collecting solids; (3) washing; (4) extraction: putting the washed solid into an extraction tank, adding an extraction solvent, stirring, and collecting an extracting solution; (5) adjusting acid and crystallizing; (6) filtering; and (7) drying the crystal to obtain a hesperidin product. The method is simple and convenient to operate, the impurity removal and extraction time is shortened to 2.5-4.0 hours from 48 hours of the conventional method, the energy consumption is low, the productivity is doubled under the condition of not increasing plants and equipment, the operability is strong, and the method is particularly suitable for industrial production.

The invention belongs to the technical field of aquaculture, and particularly relates to a circulating type fish culture device. According to the circulating type fish culture device, a fish tank unit for culturing fishes and a sedimentation tank unit for circularly purifying water in the fish tank unit are used for removing suspended matters and bacteria in the culture wastewater and finally recycling the culture wastewater, meanwhile, a rain unit with a double-layer structure is arranged, the suspended matters in the discharged wastewater are preliminarily mixed and pass through holes with adjustable sizes, and large-particle suspended matters in the wastewater are crushed into the small-particle suspended matters in the mixing process, so that the adsorption removal in the sedimentation tank in the next step is facilitated. The device has the advantages that aquaculture water resources can be recycled, the wastewater discharged into the environment is reduced, ecological balance of the surrounding environment can be maintained, meanwhile, the device is reasonable and effective in structural arrangement, suspended pollutants in aquaculture wastewater are pretreated, filtration or the adsorption removal is facilitated, and the risk of blocking a filter is reduced.

The invention discloses an incineration cleaning treatment system for industrial hazardous waste. The incineration cleaning treatment system comprises a feeding system, an incineration system, a wasteheat treatment system and a tail gas treatment system, wherein the incineration system is a plasma incineration device, the plasma incineration device comprises a plasma furnace, an air inlet assembly, a secondary combustion chamber, a main flue and an emergency discharge chimney, the air inlet assembly comprises an oxidation fan, a secondary fan and a cooling fan; and the plasma furnace comprises a plasma cabinet, a power supply control box, an igniter, a gas booster pump, a circulating cooling water device and a water RO treatment device, the igniter comprises a cathode, an anode, a cyclonic flow device and a cooling water jacket, and electric arc of the igniter performs axial moving combustion along the inner wall of the cathode under the action of cyclonic flow. According to the process, flying ash can be treated; the requirement for a calorific value of the waste is relatively low; most heavy metal elements are solidified; the system occupies a small area and has a low site requirement; and the range of treatable waste is relatively wide.

The invention discloses a device for recycling silicon powder and waste water from waste water from silicon cutting and a method thereof, which relate to waste water treatment. The device is provided with an electrolysis system, a centrifugal separation system, a drying system and a filtering system. After being pumped by a water pump, the waste water from silicon cutting is input into an electrolytic machine for electrolysis, and the electrolytic solution is input into a buffer tank to obtain electrolytic flocculation waste water; purified waste water treated by the electrolysis system is delivered to the centrifugal separation system by a pipe, so that materials with different sizes and densities are separated under the centrifugal force generated by the rotation of a centrifuge to formsilicon powder sediment and waste water; the silicon sediment obtained by the centrifugal separation system is placed in a dryer to reduce the water content in the silicon powder sediment by drying to obtain finished silicon powder; and the waste water obtained by the centrifugal separation system is lifted into a filtering device by the water pump to be filtrated and separated, and the filtrate obtained by filtering is filled into a recycled water tank to form recycled water.