233results about How to "Improve flocculation efficiency" patented technology

The present invention relates to a method of tackling sea red tides and fresh water bloom using clay as algae flocculant. The effective component of the flocculant is hydrated magnesio-silicate salt in the laminated structure including upper and lower silicon-oxygen tetrahedron layers and sandwiched magnesium-oxygen octahedron layer. The hydrated magnesio-silicate salt is easy to prepare, low in cost and high in algae flocculating elimination effect.

The invention discloses an efficient flocculent precipitate purification method for polymetallic ore benefication wastewater. Specifically, the purification method comprises the steps of: neutralizing and regulating the pH value of benefication wastewater by adopting a little amount of alkaline materials; then sequentially feeding a proper amount of proper suitable flocculant for efficient flocculation and a little amount of efficient coagulant aids for fast precipitation; separating sludge from water through action of a partition wall, wherein the treated wastewater achieves primary standardof national Integrated wastewater discharge standard (GB8978-1996); through SV30 evaluation; settling for 5minutes to achieve 45-55mL of supernatant by volume; and settling for 15 minutes to achieve 70-80mL of supernatant by volume. The purification method can fully utilize the traditional benefication wastewater lime and sedimentation process, is simple in procedure, and can simultaneously remove suspended particulate matters, organic matters and heavy metal ions in wastewater, is high in flocculation efficiency and fast in sedimentation speed, and can better solve the purification problem of the low-concentration and high-tubidity polymetallic ore benefication wastewater of multiple heavy metals.

The invention relates to the technical field of microorganisms, and discloses single needle alga. The preservation number of the single needle alga is CGMCC No.8776, and the single needle alga is named single needle alga C29. The single needle alga is fast in growth speed and high in grease yield, and is an excellent bacterial strain of producing biodiesel. The invention also provides an open culture method of the single needle alga. By adopting the method, a specific culture medium is adopted to cultivate, and growth of the single needle alga C29 and accumulation of grease are facilitated. The invention also provides a recovery method of the single needle alga C29. The recovery method has nontoxicity, high flocculation efficiency and low recovery cost. The invention also provides an application of the single needle alga C29 in production of grease, especially production of biodiesel.

The invention discloses a preparation method for anionic dicarboxy cellulose green flocculation material. The method is characterized by comprising the following steps: dissolving cellulose through a sodium hydroxide and urea system, adding an anionic reagent, and generating anionic cellulose; and then preparing the anionic dicarboxy cellulose green flocculation material after two stages of oxidation. The method is simple in operation, the raw materials are easy to obtain, the production cost is low, and the method is easy for popularization and application. According to the material disclosed by the invention, chemically modified cellulose is used as a flocculation material, so that the utilization rate of cellulosic feedstocks is sufficiently improved; no poison or byproduct is generated, so that the flocculation efficiency of the existing flocculation cellulose-based material can be significantly improved, and the environmental pollution is reduced; and meanwhile, raw material dependence of traditional synthetic polymer flocculants on petroleum resources is greatly reduced, and the generated anionic dicarboxy cellulose green flocculation material is completely biodegradable and does not cause secondary pollution. The prepared anionic dicarboxy cellulose green flocculation material is widely applied in the flocculation process of papermaking waste water, dyeing waste water, chemical waste water and municipal sewage, and thus has significant environmental and social benefits.

The invention relates to a multi-element composite flocculant for treating printing and dying wastewater and textile wastewater and a preparing method of the multi-element composite flocculant. The flocculant comprises polymeric aluminium, titanium polysilicic acid aluminium silicate, calcium aluminate powder, aluminium hydroxide gel, konjac glucomannan phosphate, chitosan, sodium silicate and an additive, wherein the deacetylation degree of the chitosan is larger than or equal to 95%. Through appropriate selection of components and proportion, the multi-element composite flocculant has the advantages of being high in flocculation efficiency, small in dosage, wide in temperature application range and pH application range and the like. The multi-element composite flocculant can be used for treatment and purification of the printing and dying wastewater and the textile wastewater and has wide industrialized application prospects and market values.

The invention provides a flocculation concentration device for sludge treatment which is a cylindrical tank[1]. A ring groove[2] is arranged within the outer wall on the top of the cylindrical tank, a ring division board with filter openings on arranged under a bottom wall[12] of the ring groove divides the tank into a main tank[15] and a jacket[1]. The blender has an agitating blade[13] in the ring groove and another agitating blade[14] in the main tank, an feed port of the cylindrical tank is arranged on the lower part of the ring groove, the agitating blades in the ring agitating groove and main tank are installed on the same agitating shaft[8] through a cantilever[7]. Comparing to the prior art, the flocculation concentration device in the sludge treatment provided by the invention integrates flocculation and concentration into a whole, furthermore the ring agitating groove of the flocculation part and the agitator with the filter jacket of the concentration part improve the efficiency of the flocculation and concentration. The device investment is greatly reduced because of the two in one of the device and the improvement of the device efficiency.

The invention discloses a method for preparing stevia rebaudiana polyphenols through a composite chitosan flocculation method and belongs to the technical field of plant extraction. The method comprises flocculating stevia rebaudiana water extract at room temperature with composite chitosan for impurity removal, and then absorbing supernatant through microporous resin to obtain effluent for further extraction of stevioside; then eluting the microporous resin with alcohol aqueous solutions of different concentrations, combining eluent eluted by low-concentration alcohol aqueous solutions with the undiluted effluent to obtain a combined solution with a content of total phenols lower than 0.5% on a dry basis for extracting stevioside; drying the eluent eluted by high-concentration alcohol aqueous solutions to obtain stevia rebaudiana polyphenols mainly containing isochlorogenic acid. The method for preparing the stevia rebaudiana polyphenols through the composite chitosan flocculation method achieves production of the stevia rebaudiana polyphenols with high content of isochlorogenic acid on the basis of an original stevioside production process, thereby achieving comprehensive utilization of stevia rebaudiana and increasing the economic benefits for enterprises.

The present invention relates to red tide and algalbloom preventing and controlling technology, and is especially method of adopting glycolipid surfactant in treating red tide of sea water and algalbloom of fresh water. The effective component of the biological surfactant is sophor glycolipid as one kind of mixture comprising one acid type matter and one lactone type matter. It may be used alone to inhibit and kill harmful alga and crack their cells effectively and the effective concentration for eliminating alga in different kinds is 5-10 mg/l. It may be also used through mixing with clay mineral to raise the flocculant efficiency organic clay mineral obviously, and the optimal mixing weight ratio to loess is 1 to 100-200. The present invention has easy biodegradation, no harm to other life beings, no secondary pollution and easy storing.

The invention discloses a method for treating micro-polluted source water by using a biodegradation flocculation reaction tank, belonging to the technical field of water treatment. The method comprises the concrete steps of (1) enabling micro-polluted source water to enter a mixing tank, adding a coagulant, uniformly mixing, and reacting for 10-30s; (2) enabling effluent of the mixing tank to enter a biodegradation flocculation reaction tank so as to be treated, and reacting for 15-25min; (3) enabling effluent of the biodegradation flocculation reaction tank to enter a sedimentation tank so as to be subjected to solid-liquid separation; (4) enabling effluent of the sedimentation tank to sequentially enter a filter tank and a disinfecting tank and finally enter a water supply network after the water quality is casually inspected to be up to the standard. The method has the beneficial effects that a packing layer in the biodegradation flocculation reaction tank rotates along with a driving shaft to ensure that a biofilm formed by attached microorganisms is in repeated contact with micro-polluted source water, so that low-molecular weight organic matters and ammonia nitrogen in water are degraded, the flocculation efficiency is increased, and the water quality is further improved; in addition, the reaction tank is simple in inner structure, so that the water treatment cost is reduced.

The invention discloses an environment-friendly microalgae collecting method. According to the method, microalgae is cultured into the concentration of 0.5 g/L-1.5g/L in a microalgae bioreactor, 80% of a microalgae culture solution is transferred into a flocculation reaction tank through a pipeline or a pump, a cationic starch solution with a substitution degree of 0.15-0.45 is added into the microalgae culture solution and is taken as a flocculating agent, the wet to dry weight ratio (w/w) of a cationic starch mass to the microalgae in the solution ranges from 0.01 to 0.20, the microalgae culture solution is stirred for 5-10 minutes at the rotation speed of 200 r/min to promote the microalgae to flocculate, the microalgae culture solution is subjected to static settlement for 10-30 minutes, a sedimentary microalgae concentrated solution is collected, and a liquid supernatant is circularly used for re-cultivating the microalgae. According to the environment-friendly microalgae collecting method, the cationic starch solution is taken as the flocculating agent, so that the method has the characteristics of non-toxicity, economy, environmental protection, high flocculation efficiency and the like, flocculated microalgae is dense, the enrichment factors are high, original biological characteristics of the microalgae can be better kept, and the microalgae can be directly used in the fields of food, feed, biodiesel and the like.

The invention discloses a papermaking wastewater treatment agent and a method for treating papermaking wastewater by using same. The papermaking wastewater treatment agent is prepared from an iron ionflocculant, a polyacrylamide flocculant, activated carbon, phyllosilicate, and the like. The method for treating the papermaking wastewater comprises the following steps: (1) adding lime milk into the papermaking wastewater, and adjusting the pH value to 7-11; then, adding the papermaking wastewater treatment agent and stirring; (2) when large flocculation is formed in the wastewater, stopping stirring, standing for settling, separating floccules in circulating water, and enabling the treated wastewater to enter next circulation for treating; (3) measuring the chemical oxygen demand (COD), suspended solids (SS) and chrominance index of the treated wastewater. The papermaking wastewater treatment agent disclosed by the invention has a good treatment effect on the papermaking wastewater, and is good in stability; the water quality of the papermaking wastewater treated by using the papermaking wastewater treatment agent meets emission standards.

The invention discloses a flocculant. The flocculant comprises, by weight, 75-90% of calcium hydrate, 0.8-15% of iron sulfate, and 5-14.2% of aluminum sulfate. The flocculant of the invention, which can effectively remove turbidities and harm substances of metallic ions and the like, has the advantages of nontoxicity, harmlessness, no secondary pollution, fast flocculation, low price, and use convenience.

This invention discloses a method for pretreating L-lactic acid fermentation solution with magnetic polymer by flocculation. The magnetic polymer is prepared from chitosan and ferroferric oxide in a weak acid condition. The method comprises: adding the magnetic polymer into L-lactic acid fermentation solution, stirring so that a flox occurs, applying a magnetic field for 1-2 min to separate the floc from the solution, and removing the floc to obtain L-lactic acid fermentation solution. The method has such advantages as simple process, high flocculation rate, compact floc structure, rapid solid-liquid separation, high treating efficiency and no influence on L-lactic acid content in the fermentation solution. The method has potential applications in the pretreatment of L-lactic acid fermentation solution.

The invention provides an efficient integrated flocculation system which comprises a water inlet buffer chamber, an agent putting chamber, a coagulating stirring chamber, at least two overflow settling chambers, a special settling chamber, an oblique-plate settling chamber and a water outlet chamber connected with a water outlet. For solving the high cost and low efficiency of traditional sewage treatment, multiple types of industrial wastewater instable in suspended solid particle concentration can be treated by adopting the steps of single-time dosing, stirring flocculation, multi-stage sediment and the like, the integrated system can achieve dynamic adjustment according to water amount, the sizes of the devices are enough to ensure appropriate hydraulic retention time, and various sizesof devices all can achieve stable outlet water quality in a certain time range.

The present invention provides a microalgae culture solution treatment method, which is characterized by comprising: (1) adjusting the pH value of a microalgae culture solution to be treated to 9.5-12 so as to obtain the microalgae culture solution with the adjusted pH value; and (2) carrying out contact on the microalgae culture solution with the adjusted pH value in the step (1) and a flocculant solution so as to flocculate the microalgae, wherein the flocculant solution contains chitosan and a water-soluble organic acid. With the technical scheme, the flocculation efficiency of the chlorella can be increased to more than 90% by adopting the method of the present invention.

The invention relates to a manufacturing method of flocculating agents for the sedimentation of Bayer process red mud, which belongs to the environmental protection technical scope. The invention is characterized in that: polyacrylamide obtains cation and cationic polyacrylamide is prepared by the adoption of nonionic polyacrylamide as the raw material, through basic hydrolysis, modification of ester of hydroxamic acid and Mannich reaction, with the formation of Mannich base as the intermediate step; olyacrylamide is made to consist of anion group and cation group and zwitterionic polyacrylamide is prepared by the adoption of nonionic polyacrylamide as the raw material, through basic hydrolysis, modification of ester of hydroxamic acid and Mannich reaction, with the formation of Mannich base as the intermediate step. The invention has the advantages that the preparation method is simple; the flocculation efficiency of ferriferous and siliceous slag during the manufacturing process of prior Bayer process aluminum oxide reaches to more than 20m/h; the seston in the solution after flocculation is less than or equal to 1g/L; the manufacturing method is superior to the international standards; the cost is only 70-80 percent of the international similar products; the manufacturing method is in accordance with the national conditions, easy to go into production of an industrial scale, without the generation of secondary pollution and the three wastes during the production process, and eco-friendly.