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

Belonging to the wastewater treatment field, the invention discloses a method for simultaneous removal of nitrogen and phosphorus. The method for simultaneous removal of nitrogen and phosphorus includes the steps of: A. injecting wastewater containing nitrogen and phosphorus into a reactor; B. connecting a reference electrode, an electrochemical instrument and a cathode well; C. switching a change-over switch to an anode B, regulating the current and voltage of the electrochemical instrument, and using a magnesium alloy electrode as the anode B material; D. starting magnetic stirring to let scrap iron in a fluidized suspension state; E. adjusting the pH to weak alkalinity; F. turning on the power, and carrying out electrolytic reaction to remove phosphate and part of ammonia nitrogen in wastewater to obtain the product magnesium ammonium phosphate crystal; G. switching the change-over switch to an anode A, and maintaining other lines and the electrochemical instrument at an on-state; H. converting redundant ammonia nitrogen and nitrate nitrogen to nitrogen under the action of electrooxidation; and I. at the end of the reaction, turning off the power, discharging the supernatant, and then recovering the precipitate. The method provided by the invention can achieve simultaneous removal of nitrogen and phosphorus through simple switching of electrodes.

This application relates to the field of hazardous waste treatment, more specifically, it relates to a treatment method for recovering nickel from nickel-containing sludge, the steps of which include sludge high-temperature calcination, ammonia leaching, sulfide precipitation of copper, sulfide precipitation of nickel four In this step, an additional demulsifier is added during the sulfide precipitation of copper. By adopting the above scheme, it can reduce the emulsification state caused by the fine copper sulfide precipitated particles when the sulfide precipitates copper, accelerate the settlement of copper sulfide particles, and reduce the impact on the pipeline and filter device during the treatment process.

The invention discloses a polymerization titanium salt modified chitosan flocculating agent, and a preparation method and application thereof. The preparation method of the flocculating agent comprises the steps of mixing a titaniferous compound and a strong-acid water solution for reacting to obtain an acid titanium salt water solution, and cooling the acid titanium salt water solution; after diluting the cooled acid titanium salt water solution, adding organic alkali for reacting to adjust an alkalization degree of a reaction system; then adding zinc salt, aluminum salt, calcium salt or ferric salt for stirring and reacting; after stirring and reacting for 1 to 60min, adding an organic chitosan monomer, an olefin functional organic monomer and a stabilizer into a reaction solution, and continuously reacting for 1 to 3h; after finishing the reaction, curing for 1 to 48h under the water bath condition with the temperature being ranged from 20 DEG C to 60 DEG C, and obtaining the polymerization titanium salt modified chitosan flocculating agent. The flocculating agent can be used for removing slightly soluble organic matters in waste water. The yielding water subjected to the treatment of the flocculating agent provided by the invention completely meets the requirement of 'Hygienic Standard For Drinking Water', and the removal rate of the multiple slightly soluble organic matters reaches up to above 80 percent.

The invention discloses a method for powder enhanced biochemical water treatment. The method of the present invention increases the volume load of biological treatment through the steps of screening and processing powder carriers, preparing powder slurry, hydraulic agitation, loading microorganisms on powder carriers, biological reaction treatment of sewage, precipitation, and recovery, and by adding powder carriers The microbial concentration of biological flocs in biochemical water treatment is significantly increased, the removal rate of refractory organic matter or TOC is increased, the removal rate of inorganic matter is increased, and the water quality of the effluent is improved; at the same time, the sedimentation rate of the biological flocs is fast, and the sedimentation The performance is good, and the sludge is relatively dense, which effectively reduces various problems caused by subsequent sludge treatment, making the process more green and environmentally friendly. The method of the invention can be applied to the treatment of low-concentration wastewater and high-concentration wastewater, and is suitable for developing small and high-efficiency equipment for treating various intercepted sewage.

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 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 provides an ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as a side group and an end group and a preparation method and application of the ethoxylated trimethylolpropane core hyperbranched polymer as a heavy metal chelating agent, and relates to the technical field of chemical engineering and environmental protection. The chemical formula of the ethoxylated trimethylolpropane core hyperbranched polymer taking dithiocarboxylate as a side group and an end group is CH3CH2C [CH2OCH2CH2OCOCH2CH2CH2N (CSSM) CH2CH2NHCSSM] 3, wherein M is Na<+>, K<+>or NH4<+>. The hyperbranched polymer provided by the invention is simple in preparation method, easily available in raw materials and easy to industrialize. The hyperbranched polymer can be used as aheavy metal chelating agent, the special three-dimensional space structure of the hyperbranched polymer can be alternately chelated with heavy metals to form a three-dimensional super-macromolecular combination with low solubility and strong stability, and wastewater and wastes containing heavy metals can be effectively treated.

The invention discloses a method for removing heavy metal cadmium in shellfish enzymolysis solution, which comprises the following steps: (1) preparing Fe 3 o 4 Magnetic nanoparticles; (2) Preparation of SiO 2 Core-shell magnetic microspheres; (3) preparation of polyaspartic acid modified chitosan; (4) preparation of composite airgel; (5) treatment of shellfish enzymatic solution; (6) removal of cadmium. The invention utilizes composite airgel combined with ultrasonic adsorption to remove heavy metal cadmium in shellfish enzymatic hydrolyzate, and has the advantages of simple operation, wide application range of pH, high cadmium removal effect and removal efficiency, convenient separation, etc., and has the advantages of industrialization. Application prospects.

The invention discloses a magnesium ammonium phosphate-electrooxidation integrated device and a simultaneous nitrogen and phosphorus removing method thereof and belongs to the field of wastewater treatment.The magnesium ammonium phosphate-electrooxidation integrated device comprises a magnesium ammonium phosphate-electrooxidation crystallization system and a nitrogen electrooxidation system.The magnesium ammonium phosphate-electrooxidation crystallization system comprises a reaction base and an anode B.The nitrogen electrooxidation system comprises a reaction base and an anode A.Each reaction base comprises an electrochemical instrument, a selector switch, a reference electrode, scrap iron, a cathode and a reactor, wherein the reference electrode and the cathode are connected in parallel through wires and vertically suspended in the reactor after being connected with the electrochemical instrument, the scrap iron can be suspended in the reactor through magnetic force stirring, and the selector switch is connected with the electrochemical instrument through a wire and then are connected with the anode A and the anode B in a switching mode.Just through simple electrode switching, the simultaneous nitrogen and phosphorus removing effect can be achieved, operation is easy, automatic running can be achieved, and no new pollution sources are generated.