31results about How to "Efficient flocculation" patented technology

The invention provides an inorganic-organic hybridized flocculating agent and a preparation method of the inorganic-organic hybridized flocculating agent. The inorganic-organic hybridized flocculating agent is prepared from the raw material components: an initiator, and an inorganic flocculating agent and organic monomers at the mass ratio ranging from (1 to 9) to (1 to 6), wherein the organic monomers comprise dimethyl diallyl ammonium chloride and acrylamide at the mass ratio ranging from (1 to 9) to (1 to 5); the mass of the initiator is 0.02 percent to 5 percent of that of the organic monomers. The inorganic-organic hybridized flocculating agent is prepared through introducing the acrylamide and the dimethyl diallyl ammonium chloride into the inorganic flocculating agent and initiating two types of monomers to be subjected to in-situ copolymerization in an inorganic system. The inorganic-organic hybridized flocculating agent can be adaptive to sedimentation of electrified fine grained tailings through reasonably selecting raw materials and proportioning; the sedimentation speed of a tailing suspension solution can be remarkably improved under the condition that the adding amount is low, and the turbidity of supernatant is reduced; the treatment cost of wastewater is reduced and the quality of returned water is improved, and the aims of saving energy and reducing emission are realized.

The invention discloses an urban sewage treatment composite material as well as a preparation method and application thereof. The urban sewage treatment composite material is prepared from rice hull, diatomite, polyaluminum chloride and ferment bacteria according to certain weight percentages. The preparation method comprises the following steps: A, uniformly mixing the rice hull and ferment bacteria, and naturally stacking and fermenting for two weeks to obtain a mixed raw material, wherein the fermentation temperature is 65-70 DEG C; B, when in use, uniformly mixing according to a condition that the weight ratio of the mixed raw material to water to brown sugar is equal to 1:0.3:0.01, fermenting for 110-130 minutes for later use, and ensuring that the water temperature of treated sewage is less than 10 DEG C; and C, uniformly mixing the mixed raw material which is fermented for later use with diatomite and polyaluminum chloride according to weight percentages to obtain the composite material. The invention also relates to an application of the composite material in urban sewage treatment. By virtue of the synergistic effects of adsorption, flocculation and biological transformation, the problems that an existing urban sewage treatment system cannot be used for effectively removing some hardly-degradable organic matters and soluble pollutants such as phosphorus and nitrogen can be solved, and thus a condition that effluent can reach the first grade A standard which is superior to the national urban and town sewage discharge standard can be ensured.

An ecological water purification agent containing lily juice and application thereof belong to the technical field of environmental chemical industries. The ecological water purification agent containing the lily juice is characterized by comprising the following materials by weight percentage: 55-75% of the lily juice, 20-40% of organic acid, 1-6% of a surfactant and 1-5% of a flocculant. The ecological water purification agent containing lily juice and the application thereof use the lily juice as a carrier to compound a little chemical drug, thereby having the effects of deodorizing, sterilizing, efficiently flocculating, degrading harmful materials and the like. Organic pollutants can be quickly absorbed to be removed, heavy metal ions can be precipitated and simultaneously chemical oxygen demand and suspended matters in water can be eliminated. Solid-liquid separation effect of waste water is good, and removing rate of chromaticity and turbidity is high. The ecological water purification agent containing the lily juice is simple in processing method, small in equipment investment, low in prices, environmental-friendly, wide in application, safe in storage and application, free of secondary pollution and low in production cost.

The invention discloses a preparation method of liquid potassium ferrate by utilizing ultrasonic electrolysis. The method adopts an electrolysis device, which comprises an ultrasonic wave generator and an electrolytic tank, wherein the electrolytic tank is arranged in the ultrasonic wave generator and is divided into a cathode chamber and an anode chamber by a perfluorinated ion membrane. The method comprises the following steps: (1) preparing anode electrolyte, wherein the solvent is water, the potassium hydroxide concentration is 14 to 18 mol / L, and the potassium chloride concentration is 0.5 to 2 mol / L; and preparing cathode electrolyte, wherein the solvent is water, the potassium hydroxide concentration is 1 to 3 mol / L, and the potassium chloride concentration is 0.5 to 2 mol / L; (2) starting the ultrasonic wave generator during the electrolysis process, controlling the current density in a range of 50 to 200 mA / cm2 and the temperature in a range of 30 to 40 DEG C, and obtaining liquid perfluorinated ion membrane after electrolysis. The method has the advantages of simple steps, convenient operation, and high product concentration.

The invention discloses a method for effectively controlling algae bloom in eutrophic lakes and a floating floor of a magnetic precipitating machine; polymeric aluminum ferric chloride, ferric sulfate and ultrapure magnetite powder are uniformly blended according to a certain weight proportion and are prepared into magnetic algaecide by compounding and then the magnetic algaecide, together with water, is prepared into suspension; the suspension is blended with flowing algae-containing lake water and then algae is collected, precipitated and removed. The structure of the floating floor of the magnetic precipitating machine is as follows: the side surface of a boat hull is connected with a fluidizing tank, the front end of the fluidizing tank is opened, flow baffles are arranged at the middle of the fluidizing tank in a staggered way, the area in front of the flow baffles is provided with a mixing tank, while the area behind the flow baffles is provided with a sewage collecting tank. The invention not only can effectively flocculate algae cells and granular nitrogen-phosphorus suspended matters in water, but also can transform water-soluble phosphate radicals into slightly soluble phosphate to be flocculated. The adoption of the floating floor of the magnetic precipitating machine can greatly shorten the precipitating time of floccus, can reduce the length of a subsider and improve treatment efficiency, thus being suitable for the treatment of the eutrophic water body with large area.

The invention discloses application of a water body used blue-green algae inhibitor prepared from compound type phosphorus-fixing bacterium. The product is a compound preparation and restrains propagation of blue-green algae in the water body under the combined action of inclusions; blue-green algae are suitable for growing in the water body environment at a high temperature and in high hyperphosphate still water. The product, the compound phosphorus-fixing bacterium preparation, is prepared through matching and mixing an active coagulant, the compound phosphorus-fixing bacterium subjected to intensified cultivation in a hyperphosphate environment and various mineral salts facilitating propagation of various useful algae, can quickly consume and fix nutrient phosphor salt in the water body, blocks the photosynthesis of blue-green algae, and facilitates growth of useful algae, thereby excellently restraining propagation of blue-green algae. The preparation includes the following components in weight percentage: 15-40% of the coagulant, 25-50% of the phosphorus-fixing bacterium and 30-60% of mineral salts; the components subjected to scientific compatibility and used in sunny days at the usage amount of 50-100 g / mu. m excellently restrain the blue-green algae in water body, and the product is convenient to use, non-toxic and non-harmful, and excellent in stability.

The invention relates to a biological composite flocculating agent for adsorbing heavy metal ions in heavy metal wastewater and applications thereof. The composite flocculating agent is prepared by compounding polyglutamic acid, polymeric aluminum chloride, and poly(aspartic acid) according to a weight ratio of 1: 4-6: 15-17. When the flocculating agent is used, at first, the pH value of heavy metal wastewater is adjusted to 6-9; then the biological composite flocculating agent is added into the heavy metal wastewater, the system is vibrated and stirred for 15 to 20 minutes, after vibration and stirring, centrifugal separation or static settlement is performed, and the flocculent precipitates that adsorb heavy metal ions are recovered and processed. The adsorbing performance and application range of the biological composite flocculating agent are both enhanced. The processing mode is simple and environmentally friendly. Furthermore, polyglutamic acid and poly(aspartic acid) can be easily degraded by organisms and will not generate secondary pollution; the preparation and application are convenient, and the cost is low.

The invention discloses a method and application of preparing microbial flocculant by using sweet potato processing wastewater, including directly implanting flocculation microorganisms into a fermentation medium prepared with sweet potato processing wastewater, supplementing phosphate and sweet potato processing wastewater at a specific time during the fermentation process, The fermentation broth is obtained by fermentation; the microbial flocculant is extracted by rotary evaporation and ice bath acetone; the prepared microbial flocculant is applied to the treatment of sweet potato processing wastewater and sludge dehydration treatment, and the microbial flocculant is added in stages during the treatment to reduce microbial flocculation. The removal efficiency of COD and SS is improved while reducing the dosage of the agent; the preparation method and extraction process of the present invention are simple and convenient, the fermentation time is short, and the preparation cost of the microbial flocculant is greatly reduced. The prepared microbial flocculant has a wide application range, a flocculation activity of over 96.5%, a good removal effect on COD, SS, etc. in wastewater, and can greatly improve sludge dewatering efficiency.

The invention relates to an application of citrobacter rodentium for circularly preparing biological flocculants by using waste algae, and belongs to a method for treating algal blooms. The application of the citrobacter rodentium for circularly preparing the biological flocculants by using the waste algae comprises the following steps of performing fermental cultivation on the citrobacter rodentium to obtain fermentation liquor under the condition that the inoculation amount accounts for 0.5-2% of the total weight of a fermentation medium; centrifugally removing mycelium to obtain liquid supernatant; adding ethyl alcohol of which the volume of the ethyl alcohol is twice greater than that of the liquid supernatant and standing for 12 hours at the temperature of 4 DEG C; centrifuging mixed liquid and dissolving obtained 3-5g of sediments in 100ml of deionized water; adding 2% of cetyl pyridinium chloride with the volume of 50ml in the deionized water and vibrating for 3-4 hours; collecting sediments and dissolving the sediments in 0.5M of NaCl liquor with the volume of 100ml; adding ethyl alcohol of which the volume is twice greater than the NaCl liquor; centrifuging and collecting sediments; eluting the collected sediments by using the ethyl alcohol and dissolving the sediments in 5ml of deionized water; and performing vacuum drying to obtain a product. The application of the citrobacter rodentium for circularly preparing the biological flocculants by using the waste algae has the advantages that the production cost of the biological flocculants is greatly reduced, and secondary pollution cannot be caused; and the citrobacter rodentium is easily degraded by microorganisms, is non-poisonous and harmful, is high in safety, and is beneficial to application and popularization of the biological flocculants.

The invention provides a ring amidino-polymer flocculant and a preparation method thereof. The flocculant has the characteristics of large limiting viscosity, high charge density, good water solubility and the like, and is polymerized by acrylamide functional monomer and acrylonitrile through radicals. In the structural formula of the flocculant, degree of polymerization m is between 100 and 6,000, and degree of polymerization n is between 100 and 1,000; X is -Cl or -HSO4; and Y is one of -CN, -NH2, -CONH2, -NHCHO and -COOH substituent groups.

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 belongs to the technical field of monatomic catalysts, and relates to application of a monatomic catalyst in the field of environmental protection. According to the application of the monatomic catalyst as a wastewater treatment flocculant, the monatomic catalyst is composed of a carrier and transition metal, and the carrier is any one of an inorganic calcium-based carrier, an inorganic silicon-based carrier, an inorganic aluminum-based carrier and an inorganic titanium-based carrier; the transition metal is selected from one or more of first transition metal and second transition metal; and the transition metal is anchored at a defect site on the surface of the carrier in a monatomic form. Compared with a traditional water treatment flocculant, the monatomic catalyst has a more excellent flocculation effect. The monatomic catalyst does not need any auxiliary condition, and can efficiently flocculate suspended matters in water to generate particles with larger volume andlarger mass than water, so that the particles can be quickly settled to the water bottom. Therefore, the purpose of removing suspended matters is achieved, no pollution is caused to the environment, and no side effect is caused to organisms.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a pseudomonas PR1 as well as a preparation method and application thereof. The invention provides a strain of pseudomonas PR1, and the preservation number of the pseudomonas PR1 is GDMCC (China General Microbiological Culture Collection Center) NO: 61255. The pseudomonas PR1 provided by the invention has the effect of efficiently flocculating nonferrous metal ions. The flocculating agent containing the pseudomonas PR1 is added into the non-ferrous metal wastewater containing Pb < 2 + > and / or Zn < 2 + >, so that an efficient flocculation effect can be achieved, and the flocculation rate of Pb < 2 + >is 99.35%; the flocculation rate of Zn < 2 + > is 55.90%; in the mixed wastewater of Pb < 2 + > and Zn < 2 + >, the flocculation rate of Pb < 2 + > is 92.94%, and the flocculation rate of Zn < 2 + > is 80.67%.

The invention discloses a preparation method of a composite flocculant for adsorbing metal ions, and belongs to the technical field of flocculants. The present invention separates and screens four microbial flocculant-producing bacteria with the highest flocculation activity from river sludge, mixes and ferments to obtain microbial flocculants, and produces high molecular compounds such as glycoproteins, mucopolysaccharides, proteins, cellulose, and nucleic acids. After soaking in water, the fine particles and natural colloidal particles in the water can be condensed into large flocs, which can be removed from the water. They have high-efficiency flocculation and improve the utilization rate and activity of the flocculant. Using α-ketoglutaric acid to modify chitosan, synthesize chitosan derivatives with higher adsorption capacity, introduce -NH2 to react with carbonyl groups, and introduce carboxyl groups to form stable five-membered ring chelation with metal ions It can effectively absorb heavy metal ions in wastewater. The invention solves the problems of low utilization rate, poor adsorption and low activity of the current flocculant for sewage treatment.

Aiming at problems, the invention provides an integrated water treatment device and a water treatment method. The device includes a pre-oxidation tank, a mechanical mixing tank, a mechanical flocculation tank, an inclined tube settling tank, an advanced oxidation unit, an activated carbon adsorption tank, a sand filtration tank, and the like. The device and the method achieve requirements on automatic operation through a series of operation steps including reaction, flocculation, settling, sludge collection, sludge discharging, water collection, water preparation, filtration, back washing, draining, and the like, and a operator on duty only needs water quality monitoring at regular time without the need of operating and managing water purification equipment.

The invention provides a microbial flocculant and dicyandiamide formaldehyde resin combined decoloring agent, and preparation and application methods thereof, comprising fermentation cultivation of a Pannonibacter phragmitetus B7. Strain (which has been collected in China Center for Type CultureCollection (CCTCC) and has the collection number of CCTCC NO: M2013025), extraction and preparation of a microbial flocculant, the microbial flocculant and dicyandiamide formaldehyde resin combined decoloring agent, and a treatment method of the combined decoloring agent in printing and dyeing waste water. The dicyandiamide formaldehyde resin is provided with high positive charges, thus being effectively combined with residual dye in the printing and dyeing waste water. The microbial flocculant is distributed in the supernatant of fermentation liquid, the fermentation process is simple, and extraction and preparation of the microbial flocculant are convenient. Due to combined utilization of the dicyandiamide formaldehyde resin and the microbial flocculant, a good synergistic effect is achieved and the decoloring rate can at least reach 90 percent.

The invention relates to a preparation method and applications of a modified water hyacinth algae flocculant, wherein chitosan is used as a modifier, and chitosan and water hyacinth are subjected to mixing treatment to obtain the algae flocculant. The preparation steps comprise: placing fresh root-leaf-removed water hyacinth in an oven, drying and removing water, crushing, screening, mixing the obtained water hyacinth and a chitosan solution, stirring, filtering, drying, and grinding to obtain the modified water hyacinth algae flocculant. According to the present invention, the modified water hyacinth algae flocculant for removing Microcystis during the Cyanobacteria blooms, the preparation method and the applications are provided, the modified water hyacinth algae flocculant can rapidly and effectively remove the Microcystis in the Cyanobacteria blooms, can achieve the emergency treatment on the Cyanobacteria blooms, has advantages of good removing effect, rapid effect and simple operation, and provides the important theoretical and practical significance for the rapid treatment of the Cyanobacteria blooms; and by modifying the water hyacinth around the Cyanobacteria blooms, the long-distance flocculant transportation cost is saved, and the economic benefits are great.

The invention relates to the technical field of wastewater treating agents, and particularly provides an industrial acid wastewater treating agent. The treating agent is mainly prepared from raw materials as follows: slaked lime, alkaloid, calcium lignosulfonate, a flocculating agent and sodium silicate. Compared with the prior art, the treating agent has the beneficial effects as follows: the prepared flocculant can better improve pH of effluent and has an efficient flocculation function, experiments prove that the prepared flocculant can regulate the pH of acid wastewater with pH being 1-3 to 7-8, produce large flocs with salt, oil, chloride ions or sulfate radicals as well as metal ions and has the characteristic of high produced floc settling speed, meanwhile, the use amount of polyacrylamide can be effectively reduced or removed, and the production process is simple, convenient to use and environmentally friendly.

The invention provides a method for reducing coal water slurry gasification ash water suspended solids, which comprises the following steps: discharging coal water slurry gasification ash water into aclarification tank, adding a flocculant into the clarification tank, settling the suspended solids in the ash water under the action of the flocculant, and discharging the ash water in a clear liquidarea in the clarification tank into a high-density settling tank after settling; and enabling the ash water discharged into the high-density settling tank to be sequentially subjected to coagulationtreatment in a coagulation area in the high-density settling tank, secondary flocculation treatment in a flocculation area, sedimentation in a sedimentation area and sludge concentration treatment, and discharging the treated ash water into an ash water tank. The gasification ash water is treated in a mode of combining the clarification tank and the high-density settling tank, so that the contentof suspended solids in the coal water slurry gasification ash water is effectively reduced, the water quality is optimized, the scaling of pipelines in the system is delayed, the cleaning frequency ofequipment is reduced, and a guarantee is provided for high-load long-period operation of the production system.

The invention discloses a sewage treatment device, and relates to the field of sewage treatment. The sewage treatment device comprises a flocculation bin main body, and the flocculation bin main body comprises a first flocculation cabin, a second flocculation cabin and a third flocculation cabin which are sequentially arranged from top to bottom. A first stirring device, a second stirring device and a third stirring device are respectively arranged in the first flocculation cabin, the second flocculation cabin and the third flocculation cabin, and the stirring speed of the first stirring device, the stirring speed of the second stirring device and the stirring speed of the third stirring device are sequentially reduced. The three stages of flocculation cabins are arranged, each flocculation cabin is provided with the stirring device, and the stirring devices of the three stages of flocculation cabins are set to be at different stirring speeds, so that rapid and efficient flocculation can be realized.

The invention relates to a preparation method and applications of a modified water hyacinth algae flocculant, wherein chitosan is used as a modifier, and chitosan and water hyacinth are subjected to mixing treatment to obtain the algae flocculant. The preparation steps comprise: placing fresh root-leaf-removed water hyacinth in an oven, drying and removing water, crushing, screening, mixing the obtained water hyacinth and a chitosan solution, stirring, filtering, drying, and grinding to obtain the modified water hyacinth algae flocculant. According to the present invention, the modified water hyacinth algae flocculant for removing Microcystis during the Cyanobacteria blooms, the preparation method and the applications are provided, the modified water hyacinth algae flocculant can rapidly and effectively remove the Microcystis in the Cyanobacteria blooms, can achieve the emergency treatment on the Cyanobacteria blooms, has advantages of good removing effect, rapid effect and simple operation, and provides the important theoretical and practical significance for the rapid treatment of the Cyanobacteria blooms; and by modifying the water hyacinth around the Cyanobacteria blooms, the long-distance flocculant transportation cost is saved, and the economic benefits are great.

The invention relates to the technical field of mud-water separation, and discloses a mud separating agent which is composed of the following raw materials in parts by weight: 5 parts of polyacrylamide, 2 parts of polyaluminum chloride and 1 part of polyferric sulfate. According to the invention, the polyacrylamide, the polyaluminium chloride and the polyferric sulfate are reasonably proportioned,and the excellent mud separating agent is prepared; the mud separating agent has an efficient flocculation effect, the mud-water separation efficiency is improved, mud dehydration treatment is facilitated, a supernatant can continue wastewater treatment, and the mud separating agent can also be used for industrial water; dehydrated mud can be filled into geobags, the mud separating agent is suitable for construction of flood control dams, mud recycling is achieved, and the mud separating agent better conforms to the modern concept of energy conservation and environmental protection.

The invention provides an inorganic-organic hybridized flocculating agent and a preparation method of the inorganic-organic hybridized flocculating agent. The inorganic-organic hybridized flocculating agent is prepared from the raw material components: an initiator, and an inorganic flocculating agent and organic monomers at the mass ratio ranging from (1 to 9) to (1 to 6), wherein the organic monomers comprise dimethyl diallyl ammonium chloride and acrylamide at the mass ratio ranging from (1 to 9) to (1 to 5); the mass of the initiator is 0.02 percent to 5 percent of that of the organic monomers. The inorganic-organic hybridized flocculating agent is prepared through introducing the acrylamide and the dimethyl diallyl ammonium chloride into the inorganic flocculating agent and initiating two types of monomers to be subjected to in-situ copolymerization in an inorganic system. The inorganic-organic hybridized flocculating agent can be adaptive to sedimentation of electrified fine grained tailings through reasonably selecting raw materials and proportioning; the sedimentation speed of a tailing suspension solution can be remarkably improved under the condition that the adding amount is low, and the turbidity of supernatant is reduced; the treatment cost of wastewater is reduced and the quality of returned water is improved, and the aims of saving energy and reducing emission are realized.

An ecological water purification agent containing lily juice and application thereof belong to the technical field of environmental chemical industries. The ecological water purification agent containing the lily juice is characterized by comprising the following materials by weight percentage: 55-75% of the lily juice, 20-40% of organic acid, 1-6% of a surfactant and 1-5% of a flocculant. The ecological water purification agent containing lily juice and the application thereof use the lily juice as a carrier to compound a little chemical drug, thereby having the effects of deodorizing, sterilizing, efficiently flocculating, degrading harmful materials and the like. Organic pollutants can be quickly absorbed to be removed, heavy metal ions can be precipitated and simultaneously chemical oxygen demand and suspended matters in water can be eliminated. Solid-liquid separation effect of waste water is good, and removing rate of chromaticity and turbidity is high. The ecological water purification agent containing the lily juice is simple in processing method, small in equipment investment, low in prices, environmental-friendly, wide in application, safe in storage and application, free of secondary pollution and low in production cost.

The invention relates to a water body algae removal complexing agent, in particular to a water body enzyme-based algae removal complexing agent and a preparation method, and the water body enzyme-based algae removal complexing agent is prepared from the following components in parts by weight: 28-30 parts of bromine and bromine compounds, 45-47 parts of silicon chloride, 14-16 parts of potassium ferrate, 4-6 parts of aluminum potassium sulfate, 4-6 parts of hydroxyl weed killer and 6-8 parts of surfactant. The water body enzyme-based algae removal complexing agent has the beneficial effects that 1, pollutants such as algae, green moss and the like are quickly removed; 2, the functions of efficient sterilization, oxidation, adsorption, flocculation and degradation are achieved, and the environment where algae and green moss depend on growth is changed;.

The invention relates to the technical field of decolorizing agents, and discloses a novel efficient printing and dyeing wastewater decolorizing agent and treatment equipment thereof. The novel efficient printing and dyeing wastewater decolorizing agent comprises a decolorizing treatment platform and a flocculation decolorizing treatment barrel body, and the flocculation decolorizing treatment barrel body is arranged on the top face of the left end of the decolorizing treatment platform. A decolorizing agent feeding hopper fixedly sleeves the left outer wall of the top end of the flocculation and decolorization treatment barrel body, a stirring rod is arranged above the flocculation and decolorization treatment barrel body, a first filter box is arranged on the right side of the flocculation and decolorization treatment barrel body, and an oxidation and decolorization treatment tank is arranged on the right side of the first filter box. A chlorine generator is arranged in front of the oxidation decolorization treatment tank, a sodium hydroxide solution tank is arranged behind the right side of an ultraviolet spotlight, a second filter box is arranged on the right side of the ultraviolet spotlight, and a reduction disinfection treatment tank is arranged on the right side of the second filter box. Through preparation combination of various raw materials, the effects of efficient flocculation, efficient filtration and efficient water discharge on the printing and dyeing wastewater are effectively realized.

The invention discloses an urban sewage treatment composite material as well as a preparation method and application thereof. The urban sewage treatment composite material is prepared from rice hull, diatomite, polyaluminum chloride and ferment bacteria according to certain weight percentages. The preparation method comprises the following steps: A, uniformly mixing the rice hull and ferment bacteria, and naturally stacking and fermenting for two weeks to obtain a mixed raw material, wherein the fermentation temperature is 65-70 DEG C; B, when in use, uniformly mixing according to a condition that the weight ratio of the mixed raw material to water to brown sugar is equal to 1:0.3:0.01, fermenting for 110-130 minutes for later use, and ensuring that the water temperature of treated sewage is less than 10 DEG C; and C, uniformly mixing the mixed raw material which is fermented for later use with diatomite and polyaluminum chloride according to weight percentages to obtain the composite material. The invention also relates to an application of the composite material in urban sewage treatment. By virtue of the synergistic effects of adsorption, flocculation and biological transformation, the problems that an existing urban sewage treatment system cannot be used for effectively removing some hardly-degradable organic matters and soluble pollutants such as phosphorus and nitrogen can be solved, and thus a condition that effluent can reach the first grade A standard which is superior to the national urban and town sewage discharge standard can be ensured.