Screening of Microbial Flocculant-producing Bacteria and Characterization of Produced Flocculant

A flocculant-producing strain LH64 was isolated,which shows high and stable flocculating activity for kaolin suspension. The result showed that in the beef fextract-peptone liquid medium,at 30 ℃ and pH 7.0,the strain LH64 grows well,and after 23-hour culture,the maximum growth value is achieved. The strain LH64 flocculant mainly produces extracellullar flocculant,after 23-hour culture. The flocculant has some thermalstability. The flocculating activity is remarkably increased by Ca2+ and lye. The flocculant has obvious effects in waste water treatment,demonstrating its good application prospects.