59results about How to "High flocculation activity" patented technology

The invention relates to an extra-cellular polysaccharide of aerobic Ruthia sp. strain metabolin and preparation and application thereof. An aerobic strain ZHT4-13 is separated from adhesive sludge ofwild Ruditapes philippinarums in the Bohai sea offshore of China and is identified as a Ruthia sp. The aerobic strain is treated by seed culture and amplification culture, and a fermentation broth ofthe aerobic strain is precipitated with ethanol and separated centrifugally to obtain the extra-cellular polysaccharide MBF4-13. The extra-cellular polysaccharide MBF4-13 is measured to have high flocculation activity, the FR value to kaolin reaches over 80 percent, and the removal rate to hexavalent chromium ions reaches 69.3 percent; the extra-cellular polysaccharide MBF4-13 has high activity to decolorize high-concentration wastewater, and the decolorization ratios to methylene blue, ink blue, malachite green and crystal violet reach 86.11 percent, 99.49 percent and 97.84 percent; and theextra-cellular polysaccharide MBF4-13 plays a role of obviously improving the performance and the structure of activated sludge. The extra-cellular polysaccharide has potential value of developing a novel microbial flocculant.

The invention relates to a method for preparing a compound flocculating agent, which comprises the following steps of preparing a biological flocculating agent solution; compounding the biological flocculating agent solution and an inorganic flocculating agent solution; dissolving PAC, PFS or the mixture of the PAC and the PFS in deionized water to obtain the inorganic flocculating agent solution, and mixing the biological flocculating agent solution and the inorganic flocculating agent solution according to the volume ratio of 3:10-15; and obtaining the compound flocculating agent. The compound flocculating agent prepared by the method can achieve high flocculating rate and small adding amount and reduce the amount of metal ions remained in the water body, thereby overcoming the defects of the inorganic flocculating agent solution used in water treatment.

A preparation method of a biological flocculant, the present invention is characterized in that the fermentation culture of Aspergillus is adopted, and the fermentation culture is stirred for 48 to 60 hours under the conditions of temperature of 28-30° C., pH of 6-7 and ventilation; the fermentation liquid is filtered and concentrated, Ethanol was added to the concentrated solution, and after standing, centrifugation was performed, and the precipitate was washed with ethanol and dried in vacuum to obtain a crude flocculant in light yellow brown. The preparation method of the invention has the advantages of simple production conditions and low cost. The prepared biological flocculant is suitable for sewage treatment containing granular impurities or dirt, and the dosage is generally in the range of 0.1‰ to 0.3‰. It has been proved by the flocculation treatment of sewage that compared with the existing technology, it has the advantages of good flocculation effect, fast flocculation speed, low dosage, no pollution to the environment, and no toxic effect on the human body.

The invention relates to a method for preparing a microbial flocculant which is characterized by: preparing the microbial flocculant through the steps of the preparation of liquid medium, the fermentation culture of the strain, the preparation of the flocculant crude product and flocculant refined product using the delftia acidovorans as the stain resource for preparing the microbial flocculant. The mehtod finds the delftia acidovorans capable of generating the microbial flocculant with a stable flocculability and a good flocculating effect for the first time in China. The screened flocculanthas advantages of high flocculating activity, few dosage, short fermentation time, simple extraction technology, which greatly reduces the production cost. The method for preparing the flocculant is simple and easy to apply. The experiment of wastewater treatment shows that the flocculating effect is ideal after using the flocculant.

The invention discloses pantoea sp. W36-1, of which the preservation number is CGMCC No. is 3701, a flocculant prepared by the pantoea sp. W36-1 and application of the flocculant in removal of suspensions, dyeing agents and heavy metal in waste water. Extracellular products of the bacteria have an obvious absorption peak at 200 to 250nm, and polysaccharide solution can remove 54.89 percent of free groups in the bacteria. The method for preparing the pantoea sp. W36-1 comprises the following steps of: performing fermentation culture of the bacteria strain for 48 hours, centrifuging 100ml of fermentation solution at a rotation speed of 6,000r / min for 10 minutes, adding absolute ethanol, of which the volume is 1.5 times that of supernatant, into the supernatant, uniformly mixing the absoluteethanol and the supernatant standing the mixed solution at the temperature of 4 DEG C overnight, centrifuging the precipitate, washing the precipitate by 70-percent ethanol for 2 to 3 times, and thendrying the precipitate to obtain the finished product. The flocculent activity of the fermentation culture product of the pantoea sp. W36-1 is 81.7 to 83.15 percent, the yield of the pantoea sp. W36-1 is 6g / L and can be widely used for removing suspensions, dyeing agents, heavy metal and the like in waste water.