33results about How to "Settling rate is fast" patented technology

The invention relates to a method for biochemical treatment of sewage by a powder enhanced SBR method. The method comprises the following steps: selecting a proper powder carrier, removing impuritieswith larger particle sizes, and adding water or wastewater to prepare a slurry from the powder carrier, so that the powder carrier completely absorbs moisture and does not agglomerate or float upwardsany more; adjusting the pH value of the soaked powder slurry to be proper; adding the powder slurry subjected to complete soaking and moisture absorption into a bioreactor or a biological reaction structure, so that the added powder carrier is uniformly distributed into the bioreactor; wrapping the surface of the powder carrier with the microorganisms in the bioreactor through the adhesion effectto form biological flocs with precipitated nucleuses; and finally making the microorganism powder particles pass through a biological reaction area, precipitating in a precipitation section, separating the powder carrier and the microorganisms from the discharged sludge, and recycling, so that the cyclic utilization of the powder carrier is achieved. According to the invention, the removal efficiency of degradation-resistant substances in sewage is improved, and the effluent quality is improved.

The invention relates to a cross-linked cationic polyacrylamide sludge dewatering agent which comprises the following components: deionized water, acrylamide, acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, ammonium sulfate, adipic acid, an active auxiliary agent, a chelating agent, an azo initiator, a cross-linking agent, a chain transfer agent, anoxidizing agent and a reducing agent. The preparation method comprises the following steps: mixing and stirring deionized water, acrylamide, acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, N-2, 2-propenyl-2-acrylamide, ammonium sulfate, adipic acid, the active auxiliary agent and other auxiliary cross-linking agents, and adjusting the pH value of thesolution; cooling, introducing nitrogen and discharging oxygen, adding the azo initiator, the chelating agent, the chain transfer agent, the oxidizing agent and the reducing agent, and closing a nitrogen introducing valve after reaction initiation to obtain flocculant colloid; crushing the colloid, drying at high temperature, and sieving to obtain flocculant powder; the dewatering agent is safe and environment-friendly, and can effectively improve the sewage dehydrating effect.

The invention discloses a method for removing heavy metal cadmium in shellfish enzymatic hydrolysate. The method includes the following steps of firstly, preparing Fe3O4 magnetic nanoparticles; secondly, preparing SiO2 core-shell magnetic microspheres; thirdly, preparing polyaspartic acid modified chitosan; fourthly, preparing composite aerogel; fifthly, processing the shellfish enzymatic hydrolysate; sixthly, removing cadmium. The heavy metal cadmium in the shellfish enzymatic hydrolysate is removed through the composite aerogel in cooperation with ultrasonic adsorption, operation is simple,the method has the advantages that the pH application range is wide, the cadmium removal effect and removal efficiency are high and separation is convenient, and the method has industrialized application prospects.

The invention discloses a modified red earth flocculant and a method for preparing the same. Raw materials comprise red earth, acids and tap water. The method comprises the steps: firstly, the acids and the water are mixed to form a dilute acid according to a ratio; then the dilute acid and the red earth are mixed so as to obtain an acid and earth mixture; and the acid and earth mixture is dried, grinded and sieved, and the obtained undersize product is the modified red earth flocculant. The raw materials which are used according to the method disclosed by the invention are extensive, the production process is simple, the cost is low, and the product is non-toxic and does not generate secondary pollution. When the flocculant is used for treating sludge, the input of the flocculant is less, the settlement speed of the sludge is fast, and the moisture content of treated sludge is low. The flocculant also has a relatively good phosphorus removal effect, and is economical, practical and environment-friendly.

The invention discloses a preparation method for an anion chitosan-based flocculant. The preparation method comprises the following steps: taking chitosan and 2-acrylamide-2-methallyl sulfonate (AMPS)as raw materials and taking acrylamide as a crosslinking agent; adding the three materials into a reactor, adding a defined amount of water, fully uniform mixing the three materials and fully dissolving under the condition of quick stirring; introducing nitrogen and removing interference of oxygen, and adding ceric ammonium nitrate initiator; placing the reactor under the temperature at 35-45 DEGC and reacting for 2-4h; curing after the ending of reaction, and then extracting and purifying the product, thereby acquiring the anion chitosan-based flocculant with sulfonic acid group. The preparation method disclosed by the invention is simple, with reaction stability, easiness in control and few side effects. The acquired modified chitosan flocculant has excellent solubility and flocculating performance, has an excellent treatment effect to hematite wastewater and is an efficient water treatment flocculant.

The invention discloses a biological carrier for strengthening wastewater treatment, a preparation method and application thereof, and belongs to the technical field of environmental functional materials and sewage treatment. The biological carrier comprises any four or more of: 10-70 parts of diatomite, 10-30 parts of bentonite, 5-9 parts of attapulgite, 30-40 parts of montmorillonite, 9-14 parts of fly ash, 4-9 parts of medical stone, 20-35 parts of activated carbon, 5-10 parts of dolomite, 3-8 parts of volcanic ash, 9-15 parts of sepiolite, 30-40 parts of illite, 5-10 parts of kaolin, 40-70 parts of zeolite and 35-45 parts of quartz sand. The volume load of wastewater biological treatment is increased, so that the microbial concentration of biological flocs in biochemical water treatment is remarkably increased, meanwhile, the removal rate of refractory organic matters or TOC is increased, the removal rate of inorganic matters is increased, and the effluent quality is improved.

The invention relates to a heavy metals-tolerant bacterial agent, a preparation method thereof and application of the heavy metals-tolerant bacterial agent in wastewater treatment. The preparation method comprises (1), aerating and domesticating activated sludge via synthetic distributed water; (2) centrifuging the sludge mixed liquid in a centrifuge at room temperature, removing supernate, addingdeionized water, suspending in a vortex oscillator, mixing well, centrifuging again, washing with water, and mixing well; (3) centrifuging the sludge suspension at room temperature, removing supernate, adding sodium alginate solution and sodium bicarbonate solution in sequence under stirring, adding pre-dried diatomite, stirring in a water bath at 35 DEG C for 2 hours to obtain a mixed liquid A;(4) preparing calcium nitrate solution having the mass concentration of 0.02-0.04 g/ml, adding ammonia water having the mass concentration of 0.002-0.008 g/ml slowly, and stirring well to obtain a mixed liquid B; (5) adding the mixed liquid A of (3) into the mixed liquid B of (4), and stirring bacterial agent microspheres in the mixed liquid B overnight; (6) filtering gel of (5) with a screen, andwashing with deionized water to obtain the bacterial agent in microsphere form.

The invention relates to a preparation method and application of a flocculant for treating urban sewage. The method comprises the following steps: diluting water glass of which the modulus is 2.8 to 3.5 by using water until the content of silicon dioxide is adjusted as 2 to 10 percent by weight, adding a solution to an exchange column filled with cation exchange resin to obtain a silicate gel diluent of which the content of sodium oxide is smaller than 1 percent and the pH value is smaller than 4; adding the solution into metal aluminum salt of which the silicate mole ratio is 5 to 30 under the high-rotation-speed stirring condition that the Reynolds number is greater than 6,000; adjusting the pH value of a mixture obtained by stirring as 5 to 6 by using a sodium aluminate solution of which the concentration is 5 to 10 percent by weight, so that the flocculant can be used; or performing spray drying, wherein an obtained solid also has the same effect. According to the method, multiple pollutants are flocculated and aggregated by using an aggregate with various functional groups. The flocculant is suitable for treating wastewater with various qualities, the pollutant treatment range is wide, the effect is good, the source of production raw materials is wide, the cost is low, the performance is stable, and any environmental pollution is avoided.

The invention discloses a novel composite carrier enhanced biochemical treatment method for removing heavy metals in sewage, and belongs to the technical field of sewage treatment. The method comprises the following steps: firstly, mixing diatomite and tourmaline to obtain a composite carrier, then soaking the composite carrier in sewage raw water, and stirring the mixture for obtaining compositecarrier slurry after the composite carrier completely absorbs moisture; then, adjusting the pH value of the composite carrier slurry to 7-8 by adopting a pH regulator, and then adding the composite carrier slurry into an anaerobic tank in an AAO biological treatment device; and finally, starting the AAO biological treatment device, enabling the sewage to be treated to flow into the anaerobic tankand the composite carrier and the sewage to enter a subsequent AAO treatment unit together, operating the AAO process for a period of time to perform microbial culture on the composite carrier, and operating the AAO biological treatment device under a normal stable operation stage after the microbial culture of the composite carrier is finished. According to the method, the removal rate of COD andTN in the sewage can be increased while heavy metals in the sewage are intensively removed.

The invention relates to a method for online recovering and recycling of fluorine-containing glass thinning waste liquid in the glass thinning industry. The method comprises the steps of (1) analyzingvarious acid component contents of the fluorine-containing glass thinning waste liquid; (2) under constant stirring, adding organic acid alkali metal salt to the fluorine-containing glass thinning waste liquid in a molar ratio to be mixed; (3) after sedimentation is settled, separating the sedimentation from the bottom, and after washing, dehydration and drying, obtaining a fluorosilicate alkalimetal salt solid; (4) separating an organic acid from an upper portion, after alkali metal hydroxide saponifying, and drying to obtain the organic acid alkali metal salt; (5) adding a hydrogen fluoride acid and other useful acid components to treated fluorine-containing liquid separated in the middle portion to meet the content of each component of an etching solution in an original glass thinningprocess, microfiltering, and returning to the original process for further use. The method does not bring an anion to recovering liquid after treatment, has mild reaction process, and is safe and reliable.

The invention relates to a preparation method of a gelatin grafted acrylamide cation polymeric flocculant. Current flocculant in leather wastewater treatment is easy to cause secondary pollution to the environment. The method comprises the following steps of: firstly, adding dried gelatin into deionized water; uniformly stirring and adding a catalyst; reacting for 40-60 minutes in the presence of nitrogen; then, adding acrylamide; after reaction, preparing a grafted copolymer; and then, adding a glutaraldehyde liquor and a dimethylamine liquor into the grafted copolymer, stirring and reacting for 2-4.5 hours at 45-65 DEG C, and cooling and discharging to obtain the product. The gelatin grafted acrylamide cation polymeric flocculant prepared by the method provided by the invention is good in flocculating effect, quicker in sedimentation rate, low in cost and small in pollution, and can be completely biologically degraded.

The invention discloses a preparation method of a temperature-responsive hyperbranched block flocculating agent. According to the method, pentaerythritol is used as a branching agent, N-isopropylacrylamide is used as a temperature-sensitive monomer, acryloyloxyethyl trimethyl ammonium chloride is used as a cationic monomer, and sodium polyacrylate is used as a template; the preparation method comprises the following steps: firstly, respectively adding N-isopropylacrylamide and acryloyloxyethyl trimethyl ammonium chloride into a reactor, adding a proper amount of distilled water, and stirring; after the monomers are completely dissolved, adding sodium polyacrylate, urea, pentaerythritol and tetraethoxysilane, and fully and uniformly mixing and completely dissolving under the condition of rapid stirring; adding a photoinitiator, namely, azobis (2-isobutylimidazoline) hydrochloride; introducing nitrogen into the reactor to remove oxygen; and finally, placing the reactor under the irradiation of a low-pressure ultraviolet mercury lamp to react for 4-6 hours. And after the reaction is finished, curing, and extracting and purifying a product, so as to obtain the temperature-responsive hyperbranched block flocculant. The reaction is stable, control is easy, side reactions are few, the obtained temperature-responsive hyperbranched block flocculant is good in dissolvability and pure in product, due to introduction of the temperature-responsive material, the settling speed of flocs in the flocculation process is increased, and the temperature-responsive hyperbranched block flocculant is an efficient water treatment flocculant.

The present invention provides a food sewage treatment flocculant preparation method, which comprises: dissolving dimethyl diallyl ammonium chloride and an acrylamide monomer in distilled water according to a ratio of 1:1-10 to form a solution with a concentration of 20-40 wt%; respectively preparing potassium persulfate and sodium sulfite as initiators, and preparing cerium sulfate as a catalyst; taking liquid water glass with a modulus of 2.8-3.5, diluting the water glass with water, adjusting the content to achieve a silica content of 2-10 wt%, loading the solution onto an exchange column filled with a cation exchange resin to obtain a silica sol dilute solution with a sodium oxide content of less than 1 wt% and the pH value of less than 1-4; and carrying out reaction polymerization to obtain the food sewage treatment polysilicic acid/polyacrylamide composite flocculant. According to the present invention, the flocculant is used for food sewage treatment or drinking water and wastewater treatment, can effectively remove floating impurities and water-soluble pigments in food sewage, and is suitable for industrial production and applications.

The invention discloses a preparation method of a polyaluminum ferric chloride flocculant. The preparation method comprises the following steps: step 1, respectively preparing a 1mol/L AlCl3 solution,a 1mol/L FeCl3 solution and a 1mol/L NaOH solution; step 2, mixing the AlCl3 solution prepared in the step 1 and the FeCl3 solution prepared in the step 1 according to a certain proportion to obtaina mixed solution A, performing stirring on a constant-temperature magnetic stirrer, and then slowly dropwise adding a certain amount of NaOH solution prepared in the step 1 into the mixed solution A to obtain a mixed solution B; and step 3, polymerizing the mixed solution B obtained in the step 2 at room temperature, performing curing, heating, concentrating, drying, and grinding to obtain the product. The preparation method is simple and convenient, high in energy efficiency and good in economic benefit. The invention also discloses the polyaluminum ferric chloride flocculant prepared by thepreparation method.