2results about How to "High flocculation activity" patented technology

This invention discloses a polyaluminum chloride-based composite flocculant and its preparation method, belonging to the field of water treatment agent technology. The preparation method includes: acid activation of natural attapulgite to obtain acid-modified nano-attapulgite crystal nuclei; hydrolysis of liquid polyaluminum chloride, basic zirconium chloride, and ferric chloride to form clusters, followed by the addition of polyepoxysuccinic acid of a specific molecular weight for dynamic shielding to obtain a shielding liquid; dispersing the crystal nuclei into the shielding liquid; and slowly adding carboxymethyl chitosan solution and anionic polyacrylamide solution sequentially at a specific rotation speed to obtain the liquid composite flocculant. This invention overcomes the problem of easy gelation of high-concentration liquid flocculants by strictly controlling the dosing sequence and the dynamic spatial shielding of polyepoxysuccinic acid; by utilizing the synergistic effect of zirconium-aluminum bimetallic flocculant and the specific chelation of carboxymethyl chitosan, excellent low-temperature and low-turbidity water removal rate is achieved while strictly controlling residual aluminum; combined with acid-modified heavy crystal nuclei, the sedimentation rate of flocs is significantly improved.

The invention provides a preparation method of a microbial flocculant for efficiently removing antibiotics, which comprises the following steps: inoculating a Vilnelande azotobacter AZ6 strain into fermentation liquor, carrying out shake culture, and mixing the obtained fermentation liquor with bacterial liquid with glycerol to obtain preserved bacterial liquid; inoculating the preserved bacteria solution into a new fermentation solution, carrying out shake culture, centrifuging, and collecting a supernatant; adding absolute ethyl alcohol into the supernate, uniformly mixing, standing, centrifuging and collecting precipitate; and freeze-drying the precipitate to obtain the microbial flocculant. The invention also provides application of the microbial flocculant for removing antibiotics in water. The microbial flocculant is used for removing antibiotics in water. The microbial flocculant disclosed by the invention is applied to a mechanism of removing antibiotics through a synergistic effect of surface adsorption, charge neutralization, adsorption bridging and sweeping and netting.