期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 75, 期 1, 页码 247-251出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2009.08.038
关键词
Microbial flocculant; Proteus mirabilis; Physicochemical property; Flocculation characterization; Flocculation mechanism
资金
- Foundation of State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), China [PCRRY09002]
- NSFC [50978190]
- 863 Program [2009AA062902]
The characterization and the flocculation mechanism of microbial flocculant TJ-F1 with high flocculating activity, produced by Proteus mirabilis from a mixed activated sludge, was investigated. Mainly consisting of protein and acid polysaccharide, TJ-F1 owns a molecular weight of 12 x 10(5) Da, which bungs strong van der Waals forces and ample binding-sites. It contains carboxyl. hydroxyl, amino groups and hydrogen bonds preferred for the flocculation process The key parameters influencing the flocculation behavior were investigated by analyzing both the Zeta potentials of the flocculation systems and the flocculating efficiencies of TJ-F1 An alkaline condition promotes its flocculating efficiency CaCl2 aids TJ-F1 by effectively decreasing the absolute value of Zeta potential Appropriate close of TJ-F1 is crucial to the flocculating efficiency During the precipitating process, the growing flocs sweep the small flocs and the suspended particles to form big flocs, which also contribute to the excellent flocculating efficiency of TJ-F1. (C) 2009 Elsevier B V All rights reseived
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