181results about "Water contaminants" patented technology

The invention discloses a method and a system for modularized combined treatment of high-difficulty organic waste water, and the treatment system comprises: a primary settling tank, an adjusting tank, a reinforced flocculation tank, a precipitation separation tank, a secondary flocculation settling tank, a buffering water tank, a pH adjusting tank, a primary honeycomb microelectrolytic tank, a flocculation settling tank, a secondary honeycomb microelectrolytic tank, an intermediate tank, a heat exchanger, a microwave catalytic oxidation device, a secondary catalytic oxidation pot, and a re-oxidation filter pipe. The treatment method adopts a combined technical scheme of a multistage honeycomb iron carbon microelectrolytic module, a reinforced flocculation module and a microwave electro-catalytic oxidation module; the invention has the characteristics of high applicability, good treatment effect, and unit modularization; the modules can be combined and cascaded freely according to the waste water condition, and thus different waste water treatment effect requirements and waste water quantity requirements are adapted; the operation cost is low; the sludge amount is low; no secondary pollution is caused; and the method is an environment-friendly high-difficulty waste water treatment method.

The invention discloses an alcaligenes faecalis and application thereof. The alcaligenes faecalis is named alcaligenes faecalis (Alcaligenesfaecalis) NR and is stored in the China General Microbiological Culture Collection Center (CGMCC) with CGMCCNo.7543 on April 28, 2013. The alcaligenes faecalis is applicable to the treatment of nitrogen-containing organic wastewater and can be used for synchronously removing nitrogen and organic carbon in the wastewater. The alcaligenesfaecalis NR has both functions of denitriding and removing the organic carbon synchronously, only needs one aerobic stage to realize the synchronous removal of the organic carbon and nitrogen, and has the removal rate of about 80 to 90% for the organic ratio, and the removal rate of about 78 to 88% for TN (Total Nitrogen).

Treated water with good water quality which can be discharged or reused is obtained by efficiently removing SS, fluorine, cyanogen, selenium, ammonia, and COD components contained in coal gasification wastewater such as gas washing wastewater generated in a coal gasification step. A method of treating coal gasification wastewater comprising steps (1) to (4), wherein the step (1) is performed prior to the step (2): (1) a fluorine removal step in which fluorine is removed by coagulation sedimentation; (2) a cyanogen decomposition step in which cyanogen is decomposed by wet oxidation or thermal hydrolysis; (3) a selenium treatment step in which selenate ions are subjected to a reduction treatment with a metal reductant; and (4) a COD/ammonia removal step in which COD and/or ammonia are/is removed.

The invention discloses pseudomonas stutzeri and its culture, immobilization and use. The disclosed pseudomonas stutzeri is pseudomonas stutzeri WZUF25, is preserved in the China general microbiological culture collection center and has the preservation number of CGMCC NO. 7685. The pseudomonas stutzeri has wide aerobic denitrification suitable pH and temperature ranges, has a high NO3<->-N and NO2<->-N removal rate and a high NH4<->-N assimilation capability, and can provide a culture source for synchronous nitrification and denitrification. The invention also provides immobilized pseudomonas stutzeri prepared by an active carbon-calcium alginate embedding method. The immobilized pseudomonas stutzeri has a good NO3<->-N removal capability and good stability.

The invention discloses a method for removing phenol in phenol contained wastewater by using a hollow fiber membrane. The method comprises the following steps of: mixing a carrier and a diluent to prepare an extractant, wherein the adopted extractant carrier is tributyl phosphate, and the adopted diluent is coal oil or benzene; stirring and fully mixing the extractant and a stripping agent to prepare treating fluid; removing the phenol out of the phenol contained wastewater by using a hollow fiber membrane device; and after pretreating the hollow fiber membrane device, injecting the treating fluid into a tube pass of a membrane component, and injecting the phenol contained wastewater into a shell pass of the hollow fiber membrane component, wherein the wastewater can be treated through the same membrane component or a plurality of serial membrane components in a circular manner for many times; after the wastewater is subjected to two-stage treatment, the phenol concentration is less than 100mg/L; and after the wastewater is subjected to five-stage treatment, the phenol concentration is less than 5mg/L, the removal rate reaches up to 99.8 percent, and the wastewater reaches the national emission standard.

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

The invention provides a method for solidifying and cementing tannery sludge containing heavy metals by bacillus pasteurii. The method comprises the following steps: mixing a bacteria solution of thebacillus pasteurii with tannery sludge to be treated under an aerobic condition, adding urea and calcium chloride into the bacteria solution, and solidifying at 20 to 30 DEG C for 12 to 15 days to finish solidification treatment of the tannery sludge containing heavy metals; generating calcium carbonate precipitate in the presence of the urea and calcium chloride by urease-producing bacteria to fix and cement the heavy metals in the tannery sludge and achieve harmless treatment of industrial waste residue. The method provided by the invention has the advantages of simple process, convenience in operation, obvious effect, low treatment cost, wide application range, freeness from secondary pollution and the like. Through the method provided by the invention, solidification and cementation ofthe tannery sludge containing heavy metals are realized, obtained solidified heavy metals have small leaching amount and high compressive strength, and can be taken as a building material.

The invention discloses a method for preparing an absorbing material by using lakebed sludge. According to the method, the absorbing material can be prepared by the following steps of adding bagasse and red soil into solid waste of the lakebed sludge and coal ash which serve as raw materials, and then drying, screening, carbonizing, calcining and drying. The method is simple, easy to operate and wide in application rang. Laboratory tests prove that the absorbing material can remove heavy metal in a water body effectively and can adsorb common dyes well.

According to the invention, the porous carbon-coated nano zero-valent iron composite catalyst is prepared by taking a metal skeleton as a precursor, and has excellent catalytic performance in an electro-Fenton process. The synthesis method has the advantages of simplicity and convenience in operation, low equipment requirement, good product performance reproducibility and the like. Due to the synergistic effect of iron and carbon, electron transfer is accelerated, and the catalytic efficiency is remarkably improved. The iron-carbon material has strong magnetism, can be quickly separated in a magnetic field, and is convenient to recover.

The invention provides a process for treating arsenic-containing wastewater. The process includes removing arsenic by a 'hydrogen peroxide plus iron salt' method, adding lime to the wastewater to increase the pH, reacting calcium ions with the arsenic in the wastewater to generate precipitates of calcium arsenite and calcium arsenate, and performing sedimentation and filtration to remove the arsenic; adding ferrite and hydrogen peroxide to obtained filter liquor, performing sufficient aeration and oxidation by compressed air, oxidizing Fe2+ in the wastewater into Fe3+, oxidizing As3+ into As5+, generating precipitates of calcium/ferric arsenate and calcium/ferric arsenite, and removing the arsenic through filtration to meet emission standards. The process, in which the arsenic-containing wastewater is treated by a lime-iron salt method, has the advantages of few type of feed drugs, high sedimentation efficiency, stable and up-to-standard wastewater discharge, low operating cost, convenience in operation and the like, and is widely applied.

The invention discloses a Brevibacillus laterosporu with function in quickly decomposing nitrite nitrogen and bacteriostasis function and an application thereof. The screening strain is Brevibacillus laterosporu YB-02, the strain collection number is CGMCC-No. 9757. The strain provided by the invention has a capacity of effectively decomposing nitrite nitrogen in water, has cholate resistance and trypsin resistance, and further has higher inhibiting effects to mariculture pathogenic bacteria like vibrio splendidus, shewanella smarisflavi and edwardsiella tarda. Therefore, the strain provided by the invention can be used for developing probiotics products for mariculture water purification and bacterial inhibition, the antibiotics abuse is avoided, the fishing disease is prevented and treated effectively, the quality and yield of marine food products are improved; the strain has effective, fast and safe water purification effect to acute water pollution, and therefore, the strain is wide in application prospect.

The invention belongs to the technical field of microbes, and discloses a composite microbial inoculant for treating coal chemical industry sewage. The composite microbial inoculant is prepared from the following steps: 1) preparing auxiliary materials; 2) preparing paste liquor; 3) preparing a carrier; and 4) preparing the composite microbial inoculant. The composite microbial inoculant can effectively remove ammonia nitrogen, sulfides and phenyl amines in coal chemical industry sewage, has favorable removal effect and achieves the discharge standard.

The invention discloses a double-alkali neutralization treatment method of heavy metal-containing acidic wastewater. According to the double-alkali neutralization treatment method, sodium hydroxide is mainly used for adjusting a pH value so that metal ions in acidic wastewater form precipitates, the precipitates are recovered, the recovered metal sludge is treated and then can be used as metal oxides for next use, through lime use, fluorine ions in the wastewater form precipitates, and the precipitates do not contain heavy metals and can be treated by a common sludge treatment method. The sludge treated by the double-alkali neutralization treatment method is not used as dangerous waste or can be used as a fluorite-like accessory material, and the rest of the wastewater satisfies discharge standards by slight treatment.

The invention relates to a method for treating chemical nickel plating waste water on the basis of ozonation and biochemical technique, and belongs to the field of environment protection. Through ozone pre-oxidation, microbe inhibiting phosphiteis are converted into orthophosphate before the biochemical treatment; meanwhile, ozone can oxidize partial complex compounds; nickel after the complexation relieving becomes free nickel ions; 80 percent or more metallic nickel is precipitated through a primary precipitation pool; the outlet water total nickel of the primary precipitation pool is less than 20mg/L; anaerobic and aerobic microbes can adapt to the environment through domestication; through an aerobic biochemical technology, ammonia nitrogen is converted into trate nitrogen; then, outlet water of an aerobic pool flows back to an anaerobic pool; the heterotrophic nutrition denitrification denitrification is realized; meanwhile, the biological effect is used; organic matters in waste water are thoroughly removed, so that the nickel in the complexation state becomes free nickel ions; then, the metallic nickel can be thoroughly removed by using the good adsorption and flocculation performing of the active sludge. The method has the advantage that the total nitrogen in the treated waste water conforms to national emission standards.

The invention discloses a light cement-based graphene oxide composite adsorption material. The light cement-based graphene oxide composite adsorption material comprises, by weight, 600-650 parts of silicate cement with a mark of 42.5, 10-18 parts of sand with the fineness of 2.5-2.8, 200-230 parts of water, 0.4-0.7 part of foaming agents and 200-240 parts of graphene oxide nanometer laminar dispersion liquid. The invention further discloses a method for preparing the light cement-based graphene oxide composite adsorption material. The light cement-based graphene oxide composite adsorption material and the method have the advantages that heavy metal ions such as Cr<3+>, Cr<6+>, Ni<2+>, Cu<2+>, Pb<2+>, Zn<2+>, As<5+> and Hg<2+> in wastewater can be adsorbed and removed by the light cement-based graphene oxide composite adsorption material, the removal rate can reach 98% at least, the light cement-based graphene oxide composite adsorption material is high in adsorption capacity, adsorption rate and selectivity and easy to separate and regenerate, and the like.

The invention provides a method for removing phenol-based substances from water by using an iron-sulfur supported multi-walled carbon nano-tube reinforced persulfate, and relates to a water treatment method. A purpose of the present invention is to solve the technical defects of high cost, poor removal effect and the like of the existing method for removing phenol-based substances from water. The method comprises: 1, mixing a persulfate and pre-treated water; 2, preparing iron-sulfur supported dual-phase composite multi-walled carbon nano-tubes; 3, pouring the iron-sulfur supported dual-phase composite multi-walled carbon nano-tubes; and 4, filtering the treated water so as to complete the method. With the method of the present invention, the removal rate of the phenol-based substances in the water can achieve 87-98%, and the residual phenol-based substance in the water can be removed.

The invention discloses an achromobacter xylosoxidans bacterial strain and application thereof for degrading o-aminobenzoic acid. The bacterial strain is (Achromobacter xylosoxidans) N4, the preservation registration number thereof is CGMCC No. 3632. The (Achromobacter xylosoxidans) N4 CGMCC No. 3632 can rapidly and efficiently degrade o-aminobenzoic acid and can be applied to biological treatment on indigo printing and dyeing waste water.

The invention discloses a resin-based nano-lanthanum material and a preparation method and application thereof, and belongs to the field of environmentally functional materials. The preparation methodincludes the following steps: 1) dissolving lanthanum chloride heptahydrate and concentrated hydrochloric acid in alcohol, performing mixing, adding a resin polymer, and performing stirring at room temperature; 2) filtering the resin after completion of stirring, and performing drying; 3) adding the resin to a precipitant solution, and performing stirring at room temperature so as to filter out the resin; and 4) washing the product by using water until neutrality, adding a NaCl solution, performing stirring, filtering out the resin, and performing drying so as to obtain the resin-based nano-lanthanum material. Lanthanum is mixed with hydrochloric acid so as to make lanthanum and chloride ions form complex anions, lanthanum in the form of complex anions in alcohol is uniformly adsorbed into anion exchange resin pore channels, then the nano-lanthanum compound is further generated in situ, and the prepared nano lanthanum particles have more uniform distribution, and have a high phosphorus adsorption rate.

The invention discloses a hexavalent-chromium wastewater treatment technology. The hexavalent-chromium wastewater treatment technology includes the steps that hexavalent chromium in wastewater is reduced to trivalent chromic ions through sodium hydrogen sulfite with the oxidation-reduction method, the PH value is adjusted, and trivalent chromium forms chromic hydroxide to be removed in a precipitation method accordingly. Compared with other treatment methods, the method is low in device investment and operating cost, easy to operate and suitable for hexavalent-chromium wastewater treatment of the electroplating industry, the printing and dyeing industry, the pharmaceutical industry, the light and textile industry, the chemical industry and the like, wastewater is sustainably treated on the spot, and pollution of the industry to the environment is reduced; meanwhile, the economic benefits of enterprises are increased, and the win-win effect is achieved.

The invention discloses a prediction model for microorganism-derived dissolved organic nitrogen in sewage and application of the prediction model, and belongs to the technical field of sewage treatment. The prediction model is an ASM-mDON prediction model which is established according to operating parameters in the activated sludge treatment stage of a sewage plant, and component concentrations,kinetic parameters and stoichiometric numbers of influent water. The application specifically comprises the steps of (1) establishing the ASM-mDON prediction model; (2) measuring sewage components andparameters of the ASM-mDON prediction model; (3) predicting the concentration of microorganism-derived dissolved organic nitrogen in the sewage. The ASM-mDON prediction model is suitable for simulation of a steady-state biological sewage treatment system, and can solve the problem that in the actual sewage treatment process, microorganism-derived dissolved organic nitrogen is hard to quantify. Aprediction method has the advantages that prediction is quick, quantification is accurate and operation is convenient, and has practical significance in solving the problem of the quality of the sewage.

The invention discloses a magnetic bioreaction separation device for treating organic wastewater, which comprises a magnetic bioreactor and a rare-earth magnetic disc separation device, wherein the magnetic bioreactor consists of a reaction vessel, and microbe carrier magnetic species or magnetic zooglea formed by the microbe carrier magnetic species, which is placed in the reaction vessel; the magnetic bioreactor is connected with the rare-earth magnetic disc separation device by a flowing discharge pipeline; and the upper part of the rare-earth magnetic disc separation device is provided with a water outlet pipe, and the lower part thereof is provided with a sludge discharge valve. Since the invention utilizes the microbes attached to the microbe carrier magnetic species or magnetic zooglea to decompose the organic matter, while the magnetic zooglea and the treated water can be treated by the rare-earth magnetic disc separation device for solid-liquid separation, not only the cost on the investment and operation is lower than that of the membrane bioreactor, but also the separation efficiency is high, the energy consumption is low, and the effect on denitrification, phosphorous, SS, COD and BOD removal; and the invention is particularly suitable for treating the organic wastewater with large flow and high concentration.

The invention discloses an efficient liquid sodium acetate carbon source for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source is prepared from sodium acetate, glacial acetic acid, sodium carbonate, ethyl alcohol, glucose and deionized water. The efficient liquid sodium acetate carbon source is prepared through the following steps: uniformly mixing sodiumacetate and glacial acetic acid, adding a part of deionized water, stirring to obtain a solution 1; taking sodium carbonate, adding a part of deionized water, and stirring to obtain a solution 2; taking glucose, adding a part of deionized water, and stirring to obtain a solution 3; and mixing the solution 1, the solution 2 and the solution 3, sequentially adding ethyl alcohol and the rest of deionized water, and uniformly stirring to obtain the efficient carbon source (liquid sodium acetate) for degrading ammonia nitrogen in wastewater. The efficient liquid sodium acetate carbon source has thebeneficial effects that sodium acetate is harmless to a human body, is low in cost, is easily absorbed and used by microorganisms, and is an ideal external carbon source; glacial acetic acid can externally increase a carbon source, and the pH value is maintained in the sewage treatment process; and sodium carbonate can provide an inorganic carbon source for a part of microorganisms.

The invention relates to phosphor doping type nano titanium dioxide having efficient sunlight catalytic capability and a preparation method thereof. The average grain size of the phosphor doping type nano titanium dioxide is no more than15nm, and the specific surface of the nano titanium dioxide is 126.9m<2>/g. The preparation method is: taking tetrabutyl titanate as titanium source and phosphoric acid as phosphorus source, and using sol-gel method to synthesize phosphor doping type nano titanium dioxide grains; and grinding the obtained solid to be fine, and calcining at 400-900 DEG C to obtain P doping nano titanium dioxide grains. The best calcination temperature is 500 DEG C. The invention only requires to add phosphoric acid in alcoholic solution of tetrabutyl titanate to obtain phosphor doping nano titanium dioxide grains. When the nano grains are used for performing photocatalytic degradation on dye rhodamine B, sunlight can be directly adopted as the light source, and under the same conditions, the efficiency of photocatalytic degradation can exceed the commercial P25.

The invention discloses a method for treating coking wastewater, and relates to the technical field of coking wastewater treatment. A coking wastewater treatment system is adopted for treating, the wastewater treated by the coking biochemical system is pumped into a water distributor, the wastewater is injected into the bottom of an inclined-tube sedimentation tank by the water distributor, the wastewater is blocked by an inclined-tube packing zone in the rising process, the wastewater is discharged from the top of the inclined-tube sedimentation tank after part of suspended matters are removed to enter an upper column liquid tank, the wastewater is pumped to a shallow sand filter group by an upper column liquid pump and filtered and then enters a resin adsorption tower, the wastewater is adsorbed by resin and then the effluent flows into a tail water tank from the tower bottom. By adopting the method, the intercepting efficiency of chroma, COD and total cyanides is high, the yield of concentrated pollutants is low, the water quality stability of discharged tail water is good, the water quality and stability of the tail water are effectively improved, and the water quantity is reduced significantly; and the method has the advantages of short flow, low space occupation, appropriate investment, low operation cost and the like.