2Gasner L L, Wang D I C. Microbial cell recovery enhancement through flocculation[J]. Biotechnol Bioeng, 1970, 12(6) : 873 - 876.
3Hughes J, Ramsden D F, Symcsk. The Flocculation of bacteria using cationic synthetic flocculants and chitosan [ J ]. Biotechnol Teach, 1990,4(1) : 55 -58.