42results about How to "Good coagulation effect" patented technology

The invention discloses a low-cost domestic sewage treatment agent. The low-cost domestic sewage treatment agent contains polymerized ferric chloride, polyacrylamide, polyethyleneimine, bentonite, sodium chloride, lime, an adsorbate, sodium carbonate and a pH regulator. The treatment agent has the advantages that domestic sewage can be treated effectively, the cost is low, the effect is good, the pollution to ecological environment caused by the domestic sewage is alleviated, the removal ratio of suspended solids in the sewage reaches 98.3%, the BOD (Biochemical Oxygen Demand) removal ratio is 95.2%, the COD (Chemical Oxygen Demand) removal ratio is 96.8%, and the chroma is 5.

The invention discloses a composite flocculant and a preparation method and application thereof. The flocculant is prepared from rare-earth carbonate, sodium silicate and ferric sulfate/aluminum sulfate serving as raw materials by a composite copolymerization method. The effect of the composite flocculant of the invention is superior to that of the conventional polymeric ferric/aluminum silicate sulfate; the chroma removal rate of wastewater reaches over 90 percent; the COD Cr removal rate reaches over 65 percent; the removal rate of total phosphorus reaches over 88 percent; and the expense of a wastewater treatment medicament is reduced by 10 to 20 percent compared with PASS. The composite flocculant has rapid, large and solid alumen ustum, reduces the use amount of a single dye wastewater coagulating agent by over one half compared with PAC and by over 20 percent compared with PASS, improves the chroma removal rate of the wastewater by about 10 percent, has low processing cost, and improves the processing effect.

The invention relates to a compound coagulant made from fly ash and a preparation method and an application thereof. Steps of calcination, activation, acid dipping, alkali dipping, neutralization and copolymerization are used on the fly ash to produce the compound coagulant, that is, an inorganic compound coagulant ingredient of which is polysilicate aluminum ferric sulfate. The compound coagulant makes full use of valuable elements in the fly ash, and has the advantages of simple preparation process, low cost and obvious coagulation effect. No acid wastewater, alkali wastewater or solid waste is discharged, so the preparation method belongs to an advanced environment-friendly clean production process. The obtained compound coagulant is applicable to treatment of urban domestic sewage and industrial wastewater, has strong ability of turbidity removal, color removal and COD removal, and has the advantages of rapid floc forming speed, big and dense floc, rapid sedimentation speed, small sedimented sludge, low treatment cost and the like.

The invention relates to sewage treatment, and discloses a desulfurization wastewater treatment method. In the present invention, the organic sulfur in the reaction box and the coagulant in the flocculation box are disabled. The coagulation aid is directly added to the desulfurization wastewater adjusted by the pH value. At the same time, the dosing port and dosing position are adjusted. The dispersed suspended particles in the desulfurization wastewater are condensed into larger flocs. After passing through the clarification and concentration tank, impurities such as heavy metals in the wastewater are deposited at the bottom of the tank, and the upper layer of clear water overflows to the neutralization tank. Further, stop using sodium hypochlorite and hydrochloric acid in the neutralization box, move the dosing point of sodium hydroxide from the pH adjustment box to the reduction box, and move the dosing point of the coagulant from the flocculation box to the reaction box to Reduce the types of chemicals that need to be added in the treatment of desulfurization wastewater, reduce the complexity of dosing, avoid affecting the effluent quality of desulfurization wastewater due to excessive dosing, and also reduce the cost of dosing.

The invention relates to a method for preparing an inorganic macromolecular composite aluminum iron zinc coagulating agent by galvanized aluminum slag. The method uses industrial scrap of galvanized aluminum slag as a main raw material and adopts a method of mixed acid leaching and alkalifying copolymerization to produce and prepare the inorganic macromolecular composite aluminum iron zinc coagulating agent with good storage stability, excellent coagulating effect and low cost. The course of a preparation process is at normal atmosphere; the temperature of a reaction kettle is between 20 and 100 DEG C; and equipment and the process course are simple, economic and applicable. The prepared composite aluminum iron zinc coagulating agent is a multifunctional inorganic composite water treatment agent which has aluminum salt for removing a colloid substance, iron salt for removing an organic substance, heavy metal and other pollutants and zinc salt with strong flocculation capacity; and compared with a conventional coagulating agent, the coagulating effect is improved by 15 to 30 percent. The appearance of a liquid product is white or ivory-white liquid; and the appearance of a solid product is white or pale yellow solid. The composite aluminum iron zinc coagulating agent can be widely applied to urban water supply and sewage, industrial water supply, wastewater treatment and other fields.

The invention relates to treatment of organic waste water, in particular to a method for treating waste water in a multi-stage catalytic oxidation and microelectrolysis method, which includes comprises the following steps: pretreatment, aeration acidification, microelectrolysis, first-level catalytic oxidation treatment, aeration reaction, primary sedimentation, secondary catalytic oxidation treatment and secondary sedimentation. The COD index of treated waste water is 100-300mg/L. The method has the advantages of being high in reaction speed, simple in process flow, long in service life, less in investment cost, convenient to operate and maintain, low in operation cost and stable in treatment effect.

The invention discloses a preparation method for polymerized aluminum titanium sulfate and an application. The method comprises the following steps: mixing an aluminum sulfate solution in concentration of 0.01-0.05mol/L with a titanous sulfate solution in concentration of 0.001-0.01mol/L in a Ti/Al mole ratio of (0.1-0.6):1 and stirring in thermostatic water bath, thereby acquiring a mixed solution of titanous sulfate and aluminum sulfate; mixing the mixed solution of titanous sulfate and aluminum sulfate in a mole ratio of n(OH)/n(Al+Ti) and stirring in thermostatic water bath, thereby acquiring an inorganic compound macromolecule coagulant of polymerized aluminum titanium sulfate, wherein the mole ratio of n(OH)/n(Al+Ti) of the inorganic compound macromolecule coagulant of polymerized aluminum titanium sulfate (PTAS) is 0.1-1.0; adding 1mol/L sodium hydroxide or sodium carbonate, stirring in thermostatic water bath and then curing, thereby acquiring the polymerized aluminum titanium sulfate. The inorganic compound macromolecule coagulant prepared according to the invention has an excellent coagulating effect, simple technology, low cost, less dosage and wide application.

This invention relates to a method for preparing polyaluminum silicate chloride, with Al2O3 4-10% (m/v) and SiO2 0.1-0.5% (m/v). The polyaluminum silicate chloride has a base saturability of 70-90%, a density of 1.10-1.28 g/mL and a pH value of 3-4. The method comprises: (1) heating HCl to 40-70 deg.C, adding calcium aluminate powder, stirring and reacting for 0.5-1.5 h so that silicone and aluminum is dissolved in HCl to obtain high-activity AlCl3 solution containing polysilicate (SiO2 0.2-1.0% m/v); (2) adding a substrate that can neutralize HCl, and reacting at 80-110 deg.C for 1-4 h to form polyaluminum silicate chloride. The method has such advantages as good wastewater treatment effect, improved impurity-removing ability, good color degree, COD and phosphorous removing abilities, simple process.

The invention relates to homogeneous polysaccharides LAP-1 from herba leonuri obtained by extracting and separating the herba leonuri and a method. The homogeneous polysaccharides LAP-1 is characterized in that the polysaccharide content is more than 90 percent, the content of acid saccharides is more than 20 percent, the relative molecular mass is about 10KDa; the monosaccharide is prepared frommannose, ribose, rhamnose, glucuronic acid, galacturonic acid, glucose, galactose, xylose, arabinose and fucose; the glucosidic bond type is ->4,6.beta.mannose.(1->,alpha.GalpA.(1->,->4.alpha.galacturonic acid.(1->,->4.alpha.glucose.(1->,->4,6.alpha.glucose.(1->,->4,6.alpha. galactose.(1->,T.beta.galactose,alpha-glucuronic acid.(1->,beta.glucose.(1->,alpha.arabinose.(1->,->3.alpha.arabinose.(1->,->5.alpha.arabinose.(1->,alpha.rhamnose.(1->,->2.alpha.rhamnose.(1->,->2,4.alpha.rhamnose.(1->. The invention further provides application of homogeneous polysaccharides LAP-1 from herba leonuri in preparation of anticoagulation medicines and other medicines.

The invention relates to a water treatment clarification disinfectant. The disinfectant is prepared by using 30-45 parts by weight of polyaluminium chloride, 15-25 parts by weight of attapulgite clay and 25-45 parts by weight of chlorine dioxide. The disinfectant is mainly used for clarification and disinfection of cellar water in west regions.

The invention relates to a multilevel pipeline-mixed coacervation device. According to the technical scheme, the multilevel pipeline-mixed coacervation device comprises a plurality of levels of coacervation reaction pipes which are connected in series, each level of coacervation reaction pipes is in a snake shape, the pipe diameters of the same levels of coacervation reaction pipes are the same, and the pipe diameters of the coacervation reaction pipes are enlarged level by level in an advancing direction of sewage to be treated. When practical sewage is treated, pollutants are sufficiently reacted and polymerized in the sewage, therefore, the invention ensures favorable coagulation treatment effect, and avoids secondary pollution generated by increasing the input amount of a coagulant for poor coagulate effect.

The invention relates to a multifunctional tubular turbulent flow mixer and process for coagulating industrial wastewater. The process comprises the following steps: enabling raw water to enter a water inlet pipe of the multifunctional tubular turbulent flow mixer; adding alkali and a coagulating agent into the water inlet pipe respectively, wherein the alkali is used for adjusting the pH (Potential of Hydrogen) of the wastewater; enabling the wastewater to enter the tubular mixer and sufficiently mixing the wastewater with the added medicaments; adjusting by a valve to realize random switching of six types of operation manners of serial connection, parallel connection, single-tube, multi-tube, forward and backward operation, so as to flexibly carry out industrial wastewater treatment on variable water quality and adjust a subsequent coagulating effect to be optimal; after sufficiently mixing the wastewater with the medicaments through the mixer, adding a coagulant aid; enabling the wastewater to enter a coagulation and sedimentation tank and carrying out further treatment. According to the multifunctional tubular turbulent flow mixer and process provided by the invention, a researched device does not need power equipment, and the investment and operation cost is relatively low.

The invention discloses an industrial wastewater high-efficiency treating agent and a preparation method thereof. The industrial wastewater high-efficiency treating agent is prepared from 28 parts of activated sludge, 20 parts of activated carbon, 22 parts of polyaluminum chloride, 11 parts of aluminum sulfate, 6 parts of cationic polyacrylamide, 7 parts of ferric sulfate chloride, 16 parts of pectinase, 5 parts of copper sulfate chloride, 13 parts of oxalic acid, 5 parts of polyaluminum silicate sulfate, 7 parts of citric acid, 1 part of ethylenediaminetetramethylene phosphonic acid, 6 parts of tetrabutylammonium bromide, 2 parts of ethylene glycol monobutyl ether, 4 parts of calcium fluoride, 1 part of ammonium molybdate, 10-16 parts of ethanediol, 11-13 parts of quaternary ammonium salt lignin flocculant, 6-8 parts of butyltetra titanate, 3-5 parts of nonylphenol polyethenoxy ether, 25-45 parts of microbial solution and the like. The industrial wastewater high-efficiency treating agent has the characteristics of reasonable formula, simple preparation method, accessible raw materials, low cost and high purification speed, greatly enhances the industrial wastewater treatment effect, and has dvantages of no toxicity, no harm and favorable sewage treatment effect.

The invention discloses a making method of two-agent typed polysilicate coagulant, which comprises the following steps: diluting one or more metal salt and or polymeric metal salt solution by water to produce 5-15 percent weight density at metal elemental unit; adjusting the pH value through inorganic acid as agent A; diluting the solution with silicon material by water to produce 2-10 percent weight density at SiO2 unit as agent B; packing agent A and B separately; mixing agent A and B evenly to produce the molar rate at 1:0.5-5.0 for silica dioxide and metal; obtaining the final polysilicate coagulant. The invention can produce excellent property of polysilicate coagulant with impurity-removing and high decolouring efficiency, which forms rapid and dense floccules.

The invention discloses a composite material with a rapid blood coagulation effect and a preparation method thereof and belongs to the technical field of biological medicines. The composite material with the rapid blood coagulation effect is prepared from the following raw materials in parts by mass: 8 to 20 parts of chitosan, 7 to 14 parts of salicylaldehyde, 8 to 16 parts of 2-aminoisonicotinic acid, 1.5 to 3.5 parts of ferrous sulfate, 3 to 5 parts of dopa and 10 to 15 parts of disodium hydrogen phosphate. The prepared composite material with the rapid blood coagulation effect has good product stability and high biological safety, has a remarkable effect on blood coagulation, and is simple in process and easy to industrially produce.

The invention discloses a novel polyaluminum chloride water purifying agent and a preparation method thereof. Polyaluminum chloride contains 10wt%-12wt% of aluminum oxide, has basicity being 70 wt%-95wt%, contains lower than or equal to 0.1wt% of water insoluble substances and has pH (10g/L aqueous solution) being 4.5-5.0. The preparation method of the polyaluminum chloride water purifying agent comprises the following steps: preparing aluminum-containing mother liquor, and performing high-speed dispersion and homogenization to obtain homogenized mother liquor; adding an alkaline regulator under the condition of high-speed dispersion to adjust the polymerization degree, and performing continuous reaction to obtain the polyaluminium chloride water purifying agent. The novel polyaluminum chloride water purifying agent has the advantages of high aluminum, high basicity, high flow dispersibility, wider pH application range, better coagulation effect, COD removal rate up to 50% or higher and TP removal rate up to about 99%. In the preparation method, the high-speed dispersion technology is adopted to homogenize the aluminum-containing mother liquor and the polymerization degree and adjust reaction procedure, so that the defect of limited polymerization degree adjustment of the traditional alkali adjustment system is overcome, and complete slag-free continuous production of water purifying agent with high polymerization degree is achieved.

The invention discloses a low-temperature low-turbidity water treatment device and treatment method. The low-temperature low-turbidity water treatment device comprises an electrolytic bath, a sedimentation tank, a water inlet pipe and a water outlet pipe, wherein electrode plates are arranged inside the electrolytic bath; the electrode plates include a cathode plate and a soluble anode plate; thecathode plate and the soluble anode plate are connected with a power supply; a permanent magnet is arranged on the outer side wall of the electrolytic bath; the sedimentation tank is communicated withthe electrolytic bath through a middle water conveying pipe; a bottom sludge discharging pipe of the sedimentation tank is communicated with a residual sludge discharging pipe and a sludge reflowingpipe respectively; the output end of the sludge reflowing pipe is communicated with a bottom sludge inlet of the electrolytic bath; a sludge reflowing pump is arranged on the sludge reflowing pipe; the output end of the water inlet pipe is communicated with a bottom water inlet of the electrolytic bath; the input end of the water outlet pipe is communicated with a water outlet of the sedimentationtank. Effluent water treated according to the technical scheme adopted by the invention can meet a requirement on the water quality of influent water of a subsequent ordinary sand filter, so, that effluent water from a water purifying plant can meet the hygienic standard of domestic drinking water (GB5749-2006) is guaranteed.

The invention relates to a composite macromolecular sludge dehydrating flocculant. The composite macromolecular sludge dehydrating flocculant is prepared from the raw materials: alkylamine polyoxyethylene ether phosphate, trimethylglycine, tetraethylenepentamine, a heavy-metal ion collector and lignosulfonate as well as polyvinyl pyrrolidone, activated charcoal powder, composite macromolecular polyferric sulfate and ethyl acetate. In addition, the invention further relates to a preparation method for the composite macromolecular sludge dehydrating flocculant. According to the composite macromolecular sludge dehydrating flocculant and the preparation method thereof, all the raw materials are blended to exert complementary coordination among the substances, thus, the specific resistance of sludge is lowered greatly, the sludge dehydrating effect and decrement effect are improved, toxic, harmful and pollutant substances are effectively removed, the method is safe and stable and is free of secondary pollution, and subsequent sludge treatment processes are reduced; the decrement, stabilization, innocent treatment and resource-converting of the sludge are achieved, the operation is simple and convenient due to one-time dose, and the dosage is small, so that the flocculant is applicable to the dehydrating treatment of sludge resulting from municipal sewage and industrial wastewater.

The invention relates to a reclaimed water supplying-type surface water deep purification combined device comprising a magnetic ion exchange resin mixing reaction precipitation system, a coagulation reaction precipitation system, an ozone contact reaction tank, and an ultrafiltration membrane filtration system which are connected in order. The invention also relates to a method for purifying water by using the device, which comprises the following steps: pumping sewage into the magnetic ion exchange resin mixing reaction precipitation tank through a pipeline, removing part of suspensions and soluble organic matter; delivering the supernatant into the coagulation reaction precipitation tank, removing most suspensions, total phosphor and part of organic matter under the action of a coagulant; delivering the supernatant into the ozone contact tank, completing algae cell lysis and algae killing process by ozone, delivering ozone oxidation effluent into the ultrafiltration membrane filtration system, filtering the effluent through the membrane surface under the action of a vacuum suction pump, delivering the effluent into a clean water tank.

The invention relates to a green environment-friendly sewage treating agent. The invention is characterized in that the sewage treating agent is mainly prepared by mixing the following components in parts by weight: 20-25 parts of composite iron, 15-20 parts of dibromonitrilo propanamide, 8-12 parts of polyaluminum chloride, 30-35 parts of bentonite, 18-26 parts of straw and 3-8 parts of sodium chloride. The sewage treating agent has the advantages of favorable sewage treatment effect, high bactericidal property, low toxicity, low cost and accessible raw materials.

The invention discloses an ammonia and phosphorus removal compound drug and belongs to the technical field of water treatment. The compound drug is of a three-layer concentric circle structure and comprises a core layer, a middle layer and an outer layer from inside to outside in sequence, wherein the core layer is a zeolite layer, the middle layer is a polyferric sulfate layer, and the outer layer is a magnesium chloride layer. The compound drug has a good coagulate effect, can achieve absorptive decolorization and ammonia and phosphorus removal which can not be achieved by other compound drugs, and overcomes the defects of single agentia that only a single effect can be realized, flocculation is instable, and residues are generated easily.

The invention relates to a treatment agent of wastewater rich in arsenic ions and heavy metal ions and a preparation method. The agent is a polymeric ferric salt which is formed by mixing, by mass, 90-110 parts of polysilicate ferric chloride, 0.5-1.5 parts of sodium silicate, 3-8 parts of ferrous sulfate and 0.2-0.8 part of hydrogen peroxide and has a strong oxidizing property. The treatment agent is rich in hydroxyl free radical which is very high in oxidability, the agent itself has very high oxidability, As ions in wastewater can be effectively oxidized, the As ions are changed from trivalent arsenic to pentavalent arsenic which is easy to precipitate, and formed precipitate is more stable; the agent is rich in a large amount of trivalent arsenic and contains a large amount of silicic acid, silicic acid has a very good adsorption bridging function, the bridging and net capturing functions of ferric ions are greatly strengthened, flocculability is high, heavy metal can be effectively captured, the removal rate of arsenic is greatly increased, formed alumen ustum is big and dense, precipitation is rapid, and the precipitate is high in stability.

The invention discloses a treatment process for treating gelatin wastewater. The treatment process includes steps of delivering the wastewater to primary settling tanks and carrying out settlement treatment on the wastewater; draining wastewater treated by the primary settling tanks into Fenton tanks, carrying out oxidation treatment on the wastewater, to be more specific, adding Fenton reagents into the Fenton tanks, carrying out oxidation reaction, then adding PAC (polyaluminum chloride) into the Fenton tanks, then adding PAM (polyacrylamide) into the Fenton tanks, settling the wastewater bymeans of standing, then conveying lower-layer sludge in the Fenton tanks to sludge treatment units, delivering upper-layer wastewater into flotation tanks and continuing to treat the upper-layer wastewater. The treatment process has the advantages that Fenton oxidation methods are used with the PAC and the PAM, accordingly, raw water of the gelatin comprehensive wastewater can be sufficiently flocculated and settled, comprehensive indexes of the wastewater can be lowered to a great extent, flotation treatment in later periods can be omitted, follow-up treatment load on A/O (anaerobic/anoxic)tanks can be relieved, and the wastewater treatment cost of enterprises can be effectively saved.

The invention discloses a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse. The method adopts a reaction tank to carry out the following steps: injecting sewage into the reaction tank, and adding magnetic seeds, a coagulant and a coagulant aid to carry out magnetic coagulation treatment; after the magnetic coagulation treatment is finished, starting an electromagnet at the bottom of a sludge bucket, discharging treated sewage after static settling, and then detecting the concentration of sludge in the sludge bucket; if the sludge concentration is smaller than the set threshold value, the steps are repeated, the sewage is injected again for magnetic coagulation treatment, and magnetic seeds do not need to be added in the treatment process; and if the sludge concentration is greater than or equal to a set threshold value, carrying out in-situ magnetic seed separation and recovery through pH value adjustment, deflocculation, magnetic mud separation and mud discharge, then repeating the previous steps, injecting the sewage again for magnetic coagulation treatment, and synchronously supplementing magnetic seeds in the treatment process according to the loss amount during magnetic seed recovery. The magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse provided by the invention is short in process flow, high in sewage treatment efficiency, simple in equipment and low in operation cost.

The present invention relates to the technical field of purifying agents, more particularly to an aquaculture biological purifying agent, which comprises, by weight, 6-10% of Bacillus, 10-20% of active carbon, 10-15% of zeolite powder, 8-10% of diatomaceous earth, 10-20% of kelp residue, 2-8% of calcium oxide, and the balance of seawater. A purpose of the present invention is to provide the aquaculture biological purifying agent having the significant effect and suitable for the large-scale promotion and use.

A method of agglomerating organic drainage by adding an inorganic coagulant to remove soluble substances and suspended substances including biological metabolites in the biologically treated water after biological treatment of organic drainage, which is effective in reducing inorganic coagulation Good coagulation treatment water can be obtained on the basis of the amount of agent added. A method for treating organic waste water, wherein, the organic waste water is introduced into a biological treatment reaction tank (1), and biologically treated in an aerobic manner, and the biological treatment flow out from the outlet of the biological treatment reaction tank (1) is An inorganic coagulant is added to the water for coagulation treatment, and the pH value of the biological treatment water in the outlet area of ​​the biological treatment reaction tank (1) is below 7.3.

The present invention relates to the technical field of treatment of wastewater of printing and dyeing industry, and particularly relates to a composite coagulant used for treatment of wastewater of printing and dyeing industry water washing technology, the composite coagulant is characterized by being prepared from the following raw materials: PAC, PAM and water, wherein the weight ratio of PAC to PAM to water is 45-65: 0.6-1: 5 *10<5>, the PAC is poly aluminium chloride, the PAM is anionic polyacrylamide, and the molecular weight is about 8 million. The composite coagulant has the characteristics of obvious coagulation effect and low price.

The invention provides gel polypeptide capable of being used for preparing a hemostatic material. The amino acid sequences of the polypeptide are SEQ ID NO: 1 to 4. The polypeptide provided by the invention has good blood coagulation effect and forms gel when being in contact with blood so as to effectively stop bleeding. The polypeptide has high biodegradability and biocompatibility, and can be used for preparing hemostatic products with different forms.

The present invention relates to a chemical reagent, specifically to a novel sewage treatment agent in the field of sewage treatment, wherein the sewage treatment agent is prepared from the following components by weight: 10-25 parts of polyaluminium chloride, 20-25 parts of polyacrylamide, 7-12 parts of polyethyleneimine, and 20-25 parts of bentonite. According to the present invention, the selected polyaluminium chloride is easily dissolved in water, and has characteristics of excellent coagulation effect, good product stability and wide pH value application range, wherein the reduction of the pH value of the treated water is not high; the inorganic matter component and the organic matter component are synergistically adopted as the co-coagulation agent, such that the sewage treatment agent of the present invention has the excellent flocculation effect; and the sewage treatment agent has advantages of rapid purification, good effect, environmental protection, no toxicity, and the like.

A chemical engineering wastewater treatment device is disclosed and relates to the technical field of wastewater treatment. The device includes a water feeding tank, a microelectrolysis tank, an ozoneoxidation tank and a neutralization tank which are connected in order through a pipeline. The water feeding tank includes a water storage case used for storing wastewater and a water feeding case below the water storage case. The bottom of the water storage case is in the water feeding case and is provided with a water inlet provided with a baffle plate. A drive mechanism is disposed in the waterfeeding case. The water feeding tank is connected to the microelectrolysis treatment tank through the pipeline. A microelectrolysis filler is disposed in the microelectrolysis tank. An ozone generator is disposed in the ozone oxidation tank. An output end of the ozone generator is connected to a micropore diffuser. A pH sensor and a pH adjuster are disposed in the neutralization tank. A large amount of wastewater is continuously treated repeatedly, wastewater treatment quality in each time is ensured, and treated wastewater can completely meet the emission standard.