72results about How to "Dense floc" patented technology

The invention discloses a sulfide heavy metal chelating agent and a preparation method thereof; the method adopts a reaction between sodium sulfide water solution and sulfur to generate sodium polysulfide and uses aluminum sulfate, aluminium chloride and other aluminum salts as stabilizers so as to strengthen the flocculation effect and increase the catching effect on heavy metal ions. The chelating agent is used to treat the industrial wastewater containing heavy metal ions, can effectively restrain the generation of hydrogen sulfide, and reacts with all kinds of heavy metal ions quickly at room temperature to generate water insoluble sulfides precipitate, wherein, the particles of the produced sulfides is large, the floccule is dense and the settling time is reduced so that the concentrations of the heavy metal ions in wastewater are easy to be reduced below the national discharge standard, the generated residue can be used for recycling heavy metals and secondary pollution is not easy to cause; the method of the invention has simple devices, convenient operation and low cost, thus being applicable to the wastewater treatment in industries such as circuit board industry, plating industry, metal finishing industry, manufacturing industry, coal power stations, municipal or industrial waste incineration industry, battery production and the like.

The invention relates to the field of water treatment, in particular to a composite water purifying agent and a preparation method and application thereof. The composite water purifying agent is mainly prepared from polymeric ferric sulfate, dimethyl diallyl ammonium chloride, vinyl trimethoxy silane and polysilicic acid. The total amount of iron and the pH value of the composite water purifying agent are limited, the combination of organic components and inorganic components is closer, the flocculation capability of obtained flocculating constituents is greatly improved, and the composite water purifying agent has a good effect of removing phosphorus in water. According to the special preparation method, the combination of the organic components and the inorganic components forming the composite water purifying agent is closer, and the flocculation capability of the flocculating constituents is improved. The method is simple and easy to operate, does not produce harmful gas in the production process, and is safe and reliable. The composite water purifying agent is applied to treatment for phosphorus wastewater, has the advantages of being less in feeding amount, compact in flocculating constituents, high in sedimentation velocity, good in water-out effect, less in sludge quantity and low in treatment cost, and has significant social and economic benefits.

The invention belongs to the field of natural fresh water environment protection and mineral processing and utilization and discloses a method for in-situ pillared modification of bentonite and an algal-removing water purifying agent prepared by using the same. Unlike the conventional pillared modification method, the method of the invention is characterized in that: Al<3+> is complexed and exchanged into an mineral inter-layer domain first through ion exchange; and microwave radiation and alkali titration are used to force the Al<3+> to undergo in-situ hydrolytic polymerization in a smectiteinterlayer domain to form Al13 pillar. The method directly uses bentonite of any quality, saves a bentonite sodium treatment process and is simple, low in cost and high in synthesis efficiency. The algal-removing water purifying agent of the invention gives an effective play to the adsorption property of the bentonite and the coagulation, electrical neutralization and other functions of Al13<7+> polycation, has obvious advantages of environmental protection, low cost, compact coagulation, quick sedimentation, removal of suspended matters such as blue-green algae, turbidity and phosphorus nitride and the like and ensures that the treated water is transparent and stable in alkalinity or acidity of the water quality.

The invention relates to a nano magnetic cationic flocculant and a preparation method thereof, and is applied to the field of sewage and sludge treatment. The nano magnetic cationic flocculant is prepared by the following steps: carrying out graft copolymerization and cationization on gelatinized starch, building an electrolytic tank, carrying out a co-precipitation reaction to generate nano Fe3O4particles, and finally combining the starch graft with the magnetic fluid. The nano magnetic cationic flocculant prepared by the invention has good adsorption and flocculation effects on suspended matter in sewage and sludge, the flocculation sedimentation speed can be accelerated through action of an external magnetic field, and recycling of the flocculating agent in later stage is also facilitated. The nano magnetic flocculant is suitable for treating sewage and sludge of enterprises in papermaking industry, petrochemical industry and the like.

The invention relates to a preparing method of a composite coagulant used for treating printing and dyeing waste water.The method comprises the steps that an industrial by-product waste hydrochloric acid and aluminum profile industry aluminum-containing waste residues are added into a reaction kettle sequentially, stirring is carried out in a heat-preserving mode at normal pressure, and aluminum residue water with AlCl3 as an effective ingredient is obtained; a liquid heavy metal capture agent is put into the aluminum residue water, stirring is carried out, and plate-frame pressure filtration is carried out to obtain faint yellow clear aluminum-containing liquid; industrial-grade CaCl2 is put into the aluminum-containing liquid, and stirring is carried out; the stirring reaction is carried out in a heat-preserving mode at the normal pressure, and supernatant liquid subjected to natural sedimentation is the liquid composite coagulant.The preparing method has the advantages that the preparation technology of the composite coagulant is simple, the raw materials are wide in source, and cost is low; the product performance is stable, the added amount of chemical is small, floc is compact, and the sedimentation speed is high; the composite coagulant has good decoloration performance and a high COD removal rate, and the actual printing and dyeing waste water chroma removing rate and the COD removal rate can be 10-15% higher than those of PAC sold in the market.

The invention provides a mixed type foundry waste sand wet reclamation wastewater processing method. Firstly, wastewater is demulsified, and large suspended matters in the wastewater are flocculated in a spiral flocculating tank by virtue of an inorganic flocculating agent; then small suspended matters are flocculated by virtue of an organic flocculating agent; through standing sedimentation in an inclined tube sedimentation tank, a flocculation layer forming at the bottom in a condensed manner is extracted through a sludge pump at the bottom of the sedimentation tank; the organic flocculating agent is secondarily used, and finally, a band type concentration-vacuum-filter pressing all-in-one machine is used for treatment, so that the water content of sludge discharged at an outlet of a filter cake of the band type concentration-vacuum-filter pressing all-in-one machine is less than 40%; therefore, supernate overflowing from the inclined tube sedimentation tank and clear water from a clear water outlet of the band type concentration-vacuum-filter pressing all-in-one machine can achieve the requirement for production cycle water and the standard for direct discharge.

The invention relates to a polymer emulsion for polymer-containing sewage treatment, which is used for processing oil field sewage and a preparation method thereof. The polymer emulsion can have strong adsorptive capacity on colloidal particles and oil droplets in sewage so that the oil droplets are inverted and rapidly copolymerized. Acrylamide and acryloyloxy ethyl trimethyl ammonium chloride are adopted as cationic monomers, fatty alcohol-polyoxyethylene ethers MOA-3 and MOA-9 are adopted as emulsifying agents, tasteless kerosene is adopted as a continuous phase, water is adopted as a dispersed phase and 2,2'-azodissobutyl amidinodihydrochloride is adopted as an initiating agent; and the solid content of the obtained emulsion is 40-50 percent, the cationic degree of a polymer is 50-70 percent, and the characteristic viscosity number of the polymer is 1,026-1,378ml/g. The preparation method comprises the steps of: adding the raw materials into a reactor and stirring to form emulsion; and raising the temperature and introducing nitrogen for removing oxygen, and adding the initiating agent to react at constant temperature for five hours to obtain the polymer emulsion. The emulsion for treating polymer-containing sewage has the advantages of less medicament dosage, high oil and water separating speed, compact flocculating body, obvious water purifying effect, and the like, and can be used for treating the polymer-containing sewage of an oil field.

The invention discloses a heavy metal chelating trapping sulfide agent, and a preparation method and an application thereof. The heavy metal chelating trapping sulfide agent is hexasulfoguanidinoformic acid having a structure represented by formula I, or a water-soluble salt thereof. The preparation method of the heavy metal chelating trapping sulfide agent comprises the following steps: reacting an aqueous solution of guanidine hydrochloride or guanidine nitrate with an excess amount of an alkali to generate free guanidine, reacting the free guanidine with carbon disulfide under the action of a proper amount of an inorganic phosphate to obtain a heavy metal chelating trapping sulfide agent hexasulfoguanidinoformate, and adding a proper amount of an acid for neutralization to obtain hexasulfoguanidinoformic acid. The heavy metal chelating trapping sulfide agent can be used for removing or trapping heavy metal ions in water, and forms a heavy metal sulfide precipitate having a network structure together with the heavy metal ions in water through a chelating effect, so the relative molecular mass of a chelate is improved, the settling time is shortened, and the stability of the chelate formed by the agent and the heavy metals is increased. The formula I is shown in the specification.

The invention relates to a water purifying agent for rapid treatment of industrial wastewater and a preparation method thereof, wherein the water purifying agent comprises the following components inparts by weight: 20-35 parts of a nano diatomite powder/cellulose composite material, 5-10 parts of alkyl glycoside or derivative surfactant thereof, 60-75 parts of a flocculating agent and 2-6 partsof nitrifying bacteria. The water purifying agent prepared by the invention is simple in components and reasonable in proportion, does not contain heavy metal components in the formula, is mostly a natural compound, is an environment-friendly water purifying agent, and avoids secondary pollution to a water body; cellulose and diatomite powder are subjected to nanocrystallization and compounding, have huge specific surface area, can adsorb a large number of polluting organic matters, are fully mixed with specific contents of raw material components, and have the effects of rapid sedimentation,decolorization and COD removal; and alkyl glycoside or derivatives thereof are added, so that the water purifying agent has sterilization and disinfection effects on the water body, can effectively kill bacteria and microorganisms in the water body, and avoids water body pollution caused by mass propagation.

The invention discloses a water purifying agent for a treatment process of a polymer-containing sewage pipeline mixer of an offshore oil field and application of the water purifying agent. The water purifying agent comprises the following components by weight percent: 15.0%-20.0% of poly-silicate aluminum ferrum (PSAF), 10.0%-15.0% of poly-aluminum chloride (PAC), 5.0%-10.0% of poly-dimethyl diallyl ammonium chloride (PDA with a molecular weight of 4*10<5>g/mol-5*10<5>g/mol), 0.5%-1.0% of sodium carboxymethyl starch (CMS) and the balance of deionized water. The preparation method comprises the steps of adding poly-aluminum chloride, poly-silicate aluminum ferrum and sodium carboxymethyl starch into water, after the components are completely dissolved, adding poly-dimethyl diallyl ammonium chloride, uniformly stirring at the rotation speed of 100rpm-150rpm, so as to obtain the water purifying agent. The water purifying agent has the characteristics that flocs are compact, are rapidly formed and are high in settling velocity, a water body is strong in adaptability, effects of removing suspended solids and oil are good, the polymer-containing sewage with high content of oil field suspended solids can be effectively treated, and the reaction speed is suitable for the enhanced coagulation treatment process of the pipeline mixture.

The invention relates to a composite coagulant for advanced treatment of biochemical tail water, as well as a preparation method and application thereof. The inorganic polymer composite coagulant containing boron, silicon, aluminum and iron, which is prepared by adopting an iron source, a boron source and a silicon-aluminum source as raw materials, is applied to coagulation purification processing coagulant of all kinds of waste water, and is particularly applied to advanced treatment of the biochemical tail water. The iron source, the boron source and the silicon-aluminum source are adopted as the raw materials; the inorganic polymer composite coagulant is prepared through alkaline hydrolysis, acid leaching oxidation, hydrolysis and polymerization under heating; and the prepared composite coagulant contains 20 percent-35 percent of silicon, 15 percent-25 percent of aluminum, 6 percent-11 percent of iron, and 3 percent-6 percent of boron. The coagulant has easy-to-get raw materials and concise process, and is economic and applicable. The obtained inorganic polymer composite coagulant has good capacities of absorption and bridging, charge neutrality, bonding aggregation and decoloration, and less dosage, and is widely applied to waste water treatment field, in particular to advanced treatment of the biochemical tail water; and the flocs are big and are fast in sedimentation velocity.

The invention provides a composite flocculating agent for treating oil sand deposit tailings, and a treating method for cured fine tailings. The composite flocculating agent comprises 30-70% of polyacrylamide, 5-30% of poly(dimethyldiallyl ammonium chloride), 2-20% of a calcium-containing material and 1-20% of an adsorbent, wherein the calcium-containing material is one or more selected from the group consisting of calcium carbonate and calcium oxide, and the adsorbent is one or more selected from the group consisting of diatomite and activated carbon. The composite flocculating agent has a rapid sedimentation speed; after solid-liquid separation, liquid supernatant is clear, the content of suspended matters is low, and turbidity is small; flocs formed after flocculation are dense, and thesolid content of bottom mud is high; and the composite flocculating agent has good temperature adaptability. The composite flocculating agent has good solubility, and can be directly added as dry powder in virtue of an appropriate dosing device, thereby eliminating a flocculating agent dissolving device and reducing investment. The composite flocculating agent of the invention can be used for treating cured fine tailings; and the composite flocculating agent can also be used for secondary dewatering of bottom mud, and after the composite flocculating agent is added into the bottom mud, capillary suction time is short, yield stress is moderate, and a dehydration rate is high.