30results about How to "With environment" patented technology

The invention discloses a triblock polymer with a multi-response property for temperature and carbon dioxide. The polymer is methoxy polyethylene glycol-b-polyethylmethacrylate dimethyl betaine-b-poly dimethyl aminoethyl methacrylate; bromine-terminated methoxy polyethylene glycol serves as a macro-molecule initiator, and the triblock polymer is synthesized through an atom transfer radical polymerization reaction. The method is mild in reaction conditions, simple in operation and high in product yield; compared with an ordinary free radical polymerization reaction, the molecular structures of products are more regular, the molecular weight is controllable, and the distribution is narrower. The polymer disclosed by the invention contains a non-ionic polymer block (MPEG), a cationic polymer block (PDMAEMA) and a zwitterionic polymer block (PSBMA) at the same time, has good biocompatibility and biological fouling resistance, has the multi-response property for the temperature and the carbon dioxide in solution, and can serve as a carrier to realize load, transmission and target control release for medicine.

The invention discloses modified expandable resorcinol-phenol-formaldehyde resin and a preparation method thereof. The preparation method comprises the following steps: adding lignin, phenol and a basic catalyst into a reactor for phenolate and degradation of lignin; adding a formaldehyde solution for condensation reaction with phenolated lignin and phenol; adding paraformaldehyde for further condensation reaction with the basic catalyst; adding resorcinol for condensation polymerization, so as to obtain the phenolated lignin modified expandable resorcinol-phenol-formaldehyde resin. As phenolate and degradation of lignin are carried out in advance, the phenolic hydroxyl group content of lignin is improved. Moreover, high-activity resorcinol is added, so that the prepared lignin-based phenolic resin is high in activity; a foam material made of the modified resin through solidification is high in mechanical properties, and low in scaling off rate. The compression strength of lignin modified phenolic foam is 172.1 kPa, and the bending strength of lignin modified phenolic foam is 254.6 kPa, which are respectively 10.5 percent and 22.1 percent higher than those of foam which is not added with lignin; the scaling off rate of the lignin modified phenolic foam is 19.1 percent, which is 22.8 percent lower than that of the form which is not added with lignin.

The invention discloses a compound fertilizer capable of reducing cadmium lead content of vegetables in a slightly contaminated vegetable field and a preparation method thereof. The compound fertilizer is prepared from urea, ammonium chloride, ammonium nitrate, diammonium phosphate, a nitric phosphate potassium fertilizer, a calcium magnesium phosphate fertilizer, potassium chloride, sepiolite, kaolin, bentonite and power plant slag in a ratio. The preparation method for the compound fertilizer comprises the following steps of: A, preparing the sepiolite; B, preparing the kaolin; C, preparing the bentonite; D, preparing the power plant slag; and E, mixing the raw materials prepared in the steps A, B, C and D with the urea, the ammonium chloride, the ammonium nitrate, the diammonium phosphate, the nitric phosphate potassium fertilizer, the calcium magnesium phosphate fertilizer and the potassium chloride in the ratio, and performing production processing to prepare the compound fertilizer. The compound fertilizer is mainly characterized by comprising 36.5 to 43.5 percent of passivator which can effectively reduce active state cadmium lead content of soil and cadmium lead content of the vegetables, and 30 percent of nutrients of nitrogen, phosphorus and potassium, so that the active state cadmium and lead contents of the soil in the slightly contaminated vegetable field are reduced by 41.3 to 52.3 percent and 36.0 to 58.5 percent respectively, the cadmium content and the lead content of vegetable products are reduced by 30.1 to 52.8 percent and 27.9 to 51.0 percent respectively, and the compound fertilizer is suitable to be popularized and applied to many heavy metal contaminated areas.

A method for producing size-controllable magnetic hollow spheres belongs to the technical field of magnetic materials. The method is characterized in that a monodisperse polystyrene sphere prepared by adopting the emulsion-polymerization method and dispersion-polymerization method is used as a template; inorganic metallic salts conduct coprecipitation under the action of a precipitating agent, namely sodium hydroxide, in a water solution; a ferrite precursor for coating the polystyrene sphere is formed by the deposition on the surface of the template sphere; and during the calcining process at the high-temperature, the ferrite precursor conducts the crystal transformation when the macromolecular spherical template decomposes, so that the polystyrene sphere coated with the ferrite precursor is converted into a corresponding magnetic hollow sphere. The method has the advantages of simple and convenient operation, favorable popularization and environmental friendliness. The magnetic hollow sphere prepared by adopting the method possesses a regulated and monodispersed hollow spherical structure and different magnetic properties, meets the requirement of different practical applications, and illustrates a good prospect of application in the fields, such as the separation science, the drug targeting preparation, the material science, the coating industry, and the like.

The invention provides a tail gas recovery device based on a pressure balance control method. The device comprises a surge flask, a primary recover flask and a primary recovery compressor, wherein a micro differential pressure transducer is arranged on the surge flask; at least a gas inlet pipe is connected at a gas inlet of the surge flask; a gas outlet of the surge flask is connected with a gas inlet of the primary recovery compressor by a first high pressure pipe; an electromagnetic proportional valve is arranged on the first high pressure pipe; a gas outlet of the primary recovery compressor is connected with a gas inlet of the primary recover flask by a second high pressure pipe; a first electromagnetic valve is arranged on the second high pressure pipe. The device has a simple structure, is easy to operate and control, has small volume and light weight, completely eradicates the adverse effects of sulfur hexafluoride emitted in test processes and decomposition products of sulfur hexafluoride on environments and human bodies, achieves zero emission and recycling of sulfur hexafluoride, has economic, environmental and safety triple benefits and can be broadly applied to collection of toxic tail gases or environment polluting tail gases generated in a laboratory environment or after detection by industrial field instruments.

A foundry binder comprising (a) a polyol component selected from the group consisting of phenolic resins, polyether polyols, polyester polyols, aminopolyols, and mixtures thereof, and (b) a polyisocyanate component, wherein component (a) and/or (b) further comprise, as a solvent, one or more cycloalkanes.

The invention belongs to the technical field of high polymer materials and discloses a lignin/polyolefin thermoplastic elastomer composite and a preparation method thereof. The composite is prepared from components in percentage by mass as follows: 35%-95% of a polyolefin thermoplastic elastomer, 2%-60% of lignin, 0.5%-8% of an additive A and 0-5% of an additive B. The composite has the tensile strength ranging from 10 MPa to 35 MPa and the elongation at break ranging from 300% to 800%. With addition of lignin and the additives, a non-covalent bond connected energy sacrificial bond function is produced between the phase interfaces of the lignin and the polyolefin thermoplastic elastomer, which promotes dispersion of lignin in the polyolefin thermoplastic elastomer, the interfacial compatibility of the lignin and polyolefin is improved, breaking occurs under the action of external force before covalent bonds break, repeated breaking and reconstruction can be realized, the purpose of improving toughness is achieved, and the problem of poor mechanical performance due to poor compatibility of the lignin and polyolefin is solved.

The invention provides a preparation method of phycocyanin and belongs to the technical field of organisms. The preparation method comprises the following steps of: firstly, taking fresh algae or spirulina powder as a material; firstly, extracting coarse filtrate of phycocyanin, adding deionized water after dewatering the material; evenly mixing, and freezing at -20 DEG C to -10 DEG C; taking out and thawing at 35 DEG C after freezing; refreezing and thawing for 3-4 times, and filtering by a 120-mesh gauze; secondly, centrifugally separating to obtain supernate, carrying out ultra-filtration separation purification after carrying out dual aqueous phase extraction on the supernate; finally freezing and drying, wherein the concentration of the obtained phycocyanin can be up to over 4.0, and finally storing the phycocyanin at 3-5 DEG C. The method disclosed by the invention is simple and convenient, and high in purification efficiency when the cost is reduced, and has good application, social and economic benefits; and the purity is over 4.0.

The invention discloses a rare earth-modified natural fiber-reinforced polypropylene composite material and a preparation method thereof. The rare earth-modified natural fiber-reinforced polypropylene composite material comprises, by weight, 80-100 parts of polypropylene, 30-60 parts of natural fibers, 5-8 parts of a compatilizer, 20-35 parts of a fire retardant, 0.5-1.0 parts of a compound anti-oxidant and 1-1.5 parts of a processing assistant, and before use, the natural fibers are modified by a rare earth modifier. The preparation method has simple processes, a low cost and no pollution on the environment. The rare earth-modified natural fiber-reinforced polypropylene composite material has excellent mechanical properties, fire resistance and aging resistance, is environmentally friendly, can be recovered, can be widely used in fields of delivery vehicles such as automobiles, light rail trains and high-speed rail trains and in industries of buildings and office furniture.

The invention discloses a new method for synthesis of benzoxanthene derivatives by aqueous phase catalysis of ionic liquid. The catalyst is alkaline functionalized ionic liquid; the raw materials are alpha-naphthol, aromatic aldehyde, and 1,3-cyclohexanedione derivatives; water is used as a reaction medium; and the benzoxanthene derivatives are obtained by reaction under the action of the catalyst. Compared with the prior art, the invention has the following advantages that: (1) the alkaline functionalized ionic liquid is adopted, the raw materials are wide in sources, the preparation is convenient; the catalyst is high in activity, few in using amount, stable and not inactive when used in water; (2) the aqueous solution containing the ionic liquid catalyst can be recycled, and is environment friendly; (3) water is used instead of organic solvents, which has dual benefits of environment and economy, and the method is a high-efficient and environment-friendly method for synthesis of benzoxanthene derivatives, and facilitates large-scale industrial production.

The invention discloses a method for preparing phacellite by using coal ash as a raw material, which comprises the following steps: 1) drying the coal ash, and carrying out gradient magnetic separation of dry method; 2) mixing the magnetically-separated coal ash and potassium hydroxide according to a mass ratio of 1:0.1-0.3, adding the mixture into a crucible of a muffle furnace, heating the mixture, and baking the mixture at a constant temperature; 3) adding acid into a baked product of the coal ash according to a solid-liquid ratio of 1:1-5, dissolving the baked product in the acid for 1 to 2 hours, adding a chelating agent into the mixture according to a solid-liquid ratio of 1:0.1-0.5 during acid dissolution, and continually stirring the mixture; 4) after the acid dissolution is finished, filtering, washing and drying the filter residue to obtain a coal ash pretreatment sample; and 5) adding potassium hydroxide solution into the coal ash pretreatment sample according to a solid-liquid ratio of 1:2-5, adding the mixture into a stainless steel reaction kettle, heating the mixture to carry out hydrothermal reaction, and filtering, washing and drying a reaction product to obtain a phacellite product. The method overcomes the defects of the prior art such as high cost, uneven chemical components of the product and the like, achieves resource utilization of the solid waste coal ash, and has environmental and economic double benefits.

The invention relates to the field of rubber materials, and discloses a nitrile rubber/lignin composition, a nitrile rubber/lignin composite material and a preparation method and application thereof.The composition contains a nitrile rubber matrix, lignin, an interface reactant and a vulcanizing aid which are stored in a mixed manner or independently stored, and an activating aid is optically selected; with respect to the 100 parts of nitrile rubber matrix by weight, the contents of 1-150 parts of lignin, 0.05-30 parts of interface reactant, 0-50 parts of activating aid and 0.1-30 parts of vulcanizing aid are arranged. The nitrile rubber/lignin composite material with different mechanical properties can be obtained, the tensile strength of the nitrile rubber/lignin composite material canreach 10-30 MPa, and the elongation at break of the nitrile rubber/lignin composite material can reach 250-800%.

The present invention in particular relates to a preparation method of biological type sludge conditioning agent and the application thereof. The biological type sludge conditioning agent is prepared by using aspergillus sojae (Aspergillus sojae) as raw material, and the obtained sludge conditioning agent can be applied to the sludge dewatering. The coagulation activity of the conditioning agent of the present invention is high, the cost is low, the dosage output is high, the stability is strong, the applicable range is wide, and the present invention has the biological degradability and the environmental friendliness, and the second pollution is not caused.

The invention discloses a preparation method and application for a high-efficiency sulfate ion adsorbing material. The preparation method mainly comprises the following steps of: 1, performing crosslinking modification on natural polymer polysaccharide chitosan to prepare ternary cross-linked chitosan, and performing loading modification on the modified chitosan resin to prepare ternary cross-linked and loaded chitosan. The material is used for adsorbing the sulfate ions and has a good adsorption effect; and the material has the characteristics of degradability, biocompatibility and environment-friendliness of natural chitosan and is a novel adsorption material which has development potential.

The invention provides a method for preparing zinc sulfide semiconductor nanoparticles. The method has the main technical characteristics that zinc acetate and sulfocarbamide are selected as initial reactants; polyvinylpyrrolidone is selected as a macromolecular surfactant; the materials are mixed according to arbitrary proportion; water, ethanol, glycol and N,N-dimethylfomamide are used as reaction mediums; and the zinc sulfide semiconductor nanoparticles are obtained through chemical reaction of the solution. The method aims to solve the problems that the prior preparation method is difficult to control the reaction, is environment-friendly in the reaction process and uses an organic surfactant with high cost and complex structure, and the like. The method has the advantages that the obtained zinc sulfide semiconductor nanoparticles can generate quantum size effect and can be well dispersed in the water, the ethanol and other polar solvents.

The invention discloses an active flora traditional Chinese medicine fermentation product for replacing feed antibiotics. The fermentation product is formed by adding active flora into traditional Chinese medicine components and core materials for fermentation. The invention further discloses a preparation method of the active flora traditional Chinese medicine fermentation product for replacing feeding antibiotics, and the method includes three steps of raw material preparation, fermentation through core substance addition and secondary fermentation. The fermentation product prepared by the method is immune anti-infection microecological traditional Chinese medicine fermentation, has the effects of anti-infection microecology, immune microecology, nutritional microecology and environmental microecology, is pure in biological components, is safe, environment-friendly, zero drug resistance and pollution-free.

The invention discloses a process for biogas preparation with reconstituted tobacco waste water treatment. The process for biogas preparation with the reconstituted tobacco waste water treatment comprises the steps of waste water collection, waste water pretreatment, generation of biogas and post-treatment of discharging. Waste water generated during a process of reconstituted tobacco production contains large amount of chemical compounds containing chemical elements of nitrogen, phosphorus, sulfur and the like, and the process of biogas generation enables the waste water to meet sewage drainage standards. The process for biogas preparation with the reconstituted tobacco waste water treatment can sufficiently consume the biomass energy of the waste water generated during reconstituted tobacco production and generate biogas as well, the generated biogas can be recycled as new energy, the post-treatment waste fluid can be used as a greening water source, and the processed sludge can be used as organic mixed fertilizer; therefore, energy saving and environmental protection and double benefits of environment and economy can be achieved.

The invention relates to a textile finishing agent, in particular to a three-proofing finishing agent for wool fabric. According to the three-proofing finishing agent for wool fabric, methacrylic acid perluorobutenyloxy ethyl, N-methacrylamide and glycidyl methacrylate serve as raw material monomers, hexadecyl trimethyl ammonium bromide and fatty alcohol-polyxyethylene ether serve as a compound emulsifier, acetone and water serve as a mixed solvent, dimethyl 2,2-azobis(2-methylpropionate) serves as an initiating agent, body emulsion of the three-proofing finishing agent is prepared through a cross-linking polymerization reaction, then hydroxyethyl cellulose and sodium oleoyl amino fatty acid are compounded, and the final product is obtained. The three-proofing finishing agent has the advantages of being nontoxic, harmless, good in washing resistance and breathability and the like and achieves safety and environment friendliness, and after finishing is carried out, the wool fabric is excellent in performance, high in durability of waterproof, oil-proof and dirt-proof performance, and free of influences on the hand touch of fabric.

The invention relates to atack coat oil for connecting adjacent structural layers of a newly built or maintained pavement and a preparation method of the adhesive layer oil. The components comprise matrix asphalt and an auxiliary material, wherein the auxiliary material is one or more of old tire rubber powder, an SBS modifier, a polyolefin, a recycled polyolefin, an ethylene-vinyl acetate copolymer, natural asphalt, deoiled asphalt, waste mechanical lubricating oil, sulfur and polyphosphoric acid; wherein the dynamic viscosity at the temperature of 135 DEG C is 10-40 Pa.s. The bonding strength of the tack coat oil is high, the influence on subsequent construction is small, and the material cost is low.

The present invention discloses a GRC building member with functions of air purification and self-cleaning, and a manufacturing method thereof. The GRC building member comprises an absorption layer and a structure layer, wherein the absorption layer is attached to the outer side of the structure layer, and comprises cement, aggregate, nanometer titanium dioxide, kaolin powder and filling fine powder, and the structure layer comprises cement, aggregate and glass fiber. The manufacturing method comprises: 1) uniformly mixing and stirring the components and the water for preparing the absorption layer according to a certain ratio; 2) uniformly mixing and stirring the components and the water for preparing the structure layer according to a certain ratio; and 3) molding a GRC reinforcement skeleton layer through mechanical spraying, premixing, lapping grouting and mixing method and then molding the absorption layer, or sequentially molding the absorption layer and the structure layer in a model, and then carrying out acid washing or sanding or polishing on the surface of the absorption layer. According to the present invention, based on the titanium dioxide photocatalysis principle, the product has the functions of the original GRC building member, and further has the functions of toxic gas absorption and surface self-cleaning.

The invention provides a preparation method of a sodium alginate-carboxymethyl cellulose gel actuating membrane. The preparation method comprises the following steps: step 1, preparing a sodium alginate solution; step 2, preparing a sodium alginate-carboxymethyl cellulose solution; step 3, carrying out defoaming pretreatment on the sodium alginate-carboxymethyl cellulose solution; step 4, carrying out freeze drying treatment; and step 5, cutting and storing: cutting the obtained sodium alginate-carboxymethyl cellulose gel actuating film into 40 * 40 mm sample pieces, sealing the sample pieces by using a preservative film, and storing the sample pieces in a constant-temperature box. The preparation process is simple, the film forming rate is high, large-scale preparation can be achieved, a traditional sodium alginate type driving film can be replaced, and application value is achieved in the aspect of practical application of biological gel type artificial muscles.

The invention provides a method for processing sewage treatment plant sludge into an agricultural fertilizer, and relates to a method for producing an agricultural fertilizer from sewage plant sludge. According to the method, sewage treatment plant sludge being subjected to concentration pre-treatment is added with iron sulfide with a mass ratio of 0.3%, and the obtained mixed material enters an aeration digestion device and aeration digestion is performed, wherein the dissolved oxygen during the digestion process is 2.0-1.5 mg/l, and the digestion time is 6 d; the digested sludge enters a horizontal screw material unloading centrifuge and dehydration is performed, and separation is performed to obtain a dehydration liquid and a dehydrated mud cake after the dehydration, wherein the centrifugal separation factor is 1800-2200; the dehydration liquid is filtered and neutralized with a filtration neutralizer comprising fly ash and a gravel mixed filtration material, and the discharged liquid refluxes to the anaerobic denitrification section of the sewage plant, wherein the dissolved organic matter can be used as the carbon source of the denitrification denitrification and be removed; and the mud cake and the fly ash are mixed to achieve the water content of 55-58%, and then a conventional composting treatment is performed so as to obtain the agricultural fertilizer with the N-P-K content of 8-10%. According to the present invention, with the method, it is ensured that heavy metals do not enter the environment, the treatment cost is further reduced by using the waste to treat the waste, and the valuable economic and environmental benefits are provided.

The invention discloses a method for preparing biodiesel from tea oil cakes. The method comprises the following steps: 1) extracting grease; 2) concentrating to obtain crude tea oil; 3) deacidifying by an extraction method, and recovering the organic solvent to obtain deacidified tea oil; 4) carrying out adsorption dehydration on the deacidified tea oil and an organic solvent by adopting a silica gel drying agent to obtain dried deacidified tea oil; 5) ester exchange reaction; 6) separating liquid to obtain a coarse product; 7) washing and drying to obtain a biodiesel crude product; and 8) carrying out molecular distillation to obtain the biodiesel. In the process of preparing the biodiesel from the tea oil cakes, the free fatty acid in the crude tea oil is extracted by adopting the organic solvent, and then the deacidified tea oil is subjected to the transesterification after being subjected to the adsorption dehydration, so that the increase of the content of the free fatty acid caused by the hydrolysis of the raw material grease is avoided, the saponification reaction of the catalyst and the free fatty acid is effectively prevented, the catalytic effect of the catalyst is improved, the preparation time of the biodiesel is shortened, and the preparation efficiency and the yield of the biodiesel are improved.

The invention discloses a sulfur hexafluoride tail gas recovery device, relates to the field of sulfur hexafluoride tail gas recovery, and aims to solve the technical problems that tail gas detected by an existing sulfur hexafluoride gas detection instrument is directly discharged to the atmosphere without any treatment measures, the environment and the field worker safety are greatly affected, detection data is extremely sensitive to pressure change of a test cavity, and a compressor is directly used for extracting air from an exhaust port of the detection instrument to collect the tail gas,so that test data drifting is caused. According to the device, a gas buffer unit is arranged at a tail gas outlet of a detection instrument, starting and stopping of a diaphragm pump are controlled through a controller, gas pressure in the gas buffer unit is kept within a proper range all the time, on the premise, gas is compressed through a gas compression unit and transferred to a gas storage unit, and the sulfur hexafluoride gas with proper density can be stored in the gas storage unit. The device can solve the environment-protection problem that greenhouse effect gas is directly dischargedto pollute the atmosphere.

The invention belongs to the technical field of impact-resistant and self-healing coating materials, and particularly relates to a lignin/polyether polyol impact-resistant and self-healing coating and a preparation method thereof. The method comprises the steps: taking industrial lignin as a raw material, and obtaining purified lignin with high purity and a specific molecular weight range through purification and molecular weight grading; mixing part of purified lignin with high purity and the specific molecular weight range with styrene, and carrying out micro-nanocrystallization to obtain lignin-styrene micro-nano particles; and blending the rest purified lignin with high purity and the specific molecular weight range, lignin-styrene micro-nano particles and polyether polyol in the presence or absence of a solvent to obtain the lignin/polyether polyol impact-resistant self-healing coating. The coating has good adhesion performance and functions of impact resistance, self-healing and the like, the preparation process is simple, efficient, green and environmentally friendly, the raw materials are cheap and easy to obtain, and the green characteristic can be greatly improved.

The invention discloses an anti-dazzle guardrail board of an expressway, and relates to the field of road equipment. When the anti-dazzle guardrail board of the expressway is mounted, a base can be fixed between middle guardrails of the expressway in a manner that bolts penetrate through mounting holes, closely-arranged vane boards block high-beam light of running vehicles, and the situation thatdrivers are dazzled and traffic accidents happen is avoided. The vane boards can also be used as canvas, wind raised by the running vehicles can blow the vane boards to drive a rotating shaft to rotate, and the rotating shaft can rotate all the time under low resistance in a bearing. The vane boards can shake up and down along with springs. The anti-dazzle guardrail board of the expressway can rotate and shake along with wind, can simulate the shapes of trees and has the ornamental function and the function of beautifying the environment.

The invention discloses a method for separating a heterotrophic ammonia-oxidizing microorganism from an oligotrophic aquatic sediment. The method comprises the steps: a, separating and settling a surface sediment of a bottom layer sediment in a clean river, and then, placing the surface sediment into a sequencing batch reactor for enriching culture to obtain a domestication flora containing preculture solution; b, taking liquid out of the preculture solution, and separating and purifying microorganisms in an enriched culture solution; c, carrying out a heterotrophic ammonia-oxidizing activity experiment: measuring ammonia nitrogen degradation activities of the enriching cultured microorganisms by using a special liquid culture medium, and selecting the microorganism with the ammonia nitrogen degradation efficiency of over 60% after being cultured for 2-3 days to obtain an efficient strain, wherein the enriching cultured microorganisms are separated and purified in the step b, and d, separating, purifying and carrying out enriching culturing on the obtained efficient strain in the step c to obtain the heterotrophic ammonia-oxidizing microorganism.

The invention provides a photocuring intelligent energetic material and a preparation method thereof. The disclosed formulation includes an acrylic resin, a reactive diluent, a photoinitiator, a crystalline polymer, an energetic solid oxidant, and a stimuli-responsive additive. The preparation method disclosed by the invention comprises the step of heating, melting and mixing all the components. The self-deformation of the energetic material under the stimulation of heat, electricity and magnetic fields is realized by utilizing the flexibility of the photosensitive resin and the melting-crystallization transformation of the crystalline polymer.

The invention belongs to the technical field of domestic sewage treatment, and particularly relates to an efficient ecological purification system for domestic sewage treatment. The efficient ecological purification system comprises a first-stage purification system, a second-stage purification system and a third-stage purification system which are communicated in sequence, wherein the first-stage purification system is communicated with an external water inlet pipe, the third-stage purification system is communicated with an external water drainage pipe, the first-stage purification system consists of a first-stage purification pond, emergent aquatic plants A and floating-leaved plants A which are planted in the first-stage purification pond, and mollusks A and fishes A which are cultured in the first-stage purification pond, the second-stage purification system is composed of a second-stage purification pond, emergent aquatic plants B and floating-leaved plants B which are planted in the second-stage purification pond, and mollusks B cultured in the second-stage purification pond, and the third-stage purification system is composed of a third-stage purification pond and a biological system planted in the third-stage purification pond. The ecological treatment system can effectively treat domestic sewage and has important environmental value and social value.