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	Production, Characterization, and Flocculation Mechanism of Cation Independent, pH Tolerant, and Thermally Stable Bioflocculant from Enterobacter sp ETH-2
	Tang, Wei1; Song, Liyan1,2; Li, Dou1,2; Qiao, Jing1; Zhao, Tiantao3; Zhao, Heping4
	2014-12-08
摘要	Synthetic high polymer flocculants, frequently utilized for flocculating efficiency and low cost, recently have been discovered as producing increased risk to human health and the environment. Development of a more efficient and environmentally sound alternative flocculant agent is investigated in this paper. Bioflocculants are produced by microorganisms and may exhibit a high rate of flocculation activity. The bioflocculant ETH-2, with high flocculating activity (2849 mg Kaolin particle/mg ETH-2), produced by strain Enterobacter sp. isolated from activated sludge, was systematically investigated with regard to its production, characterization, and flocculation mechanism. Analyses of microscopic observation, zeta potential and ETH-2 structure demonstrates the bridging mechanism, as opposed to charge neutralization, was responsible for flocculation of the ETH-2. ETH-2 retains high molecular weight (603 to 1820 kDa) and multi-functional groups (hydroxyl, amide and carboxyl) that contributed to flocculation. Polysaccharides mainly composed of mannose, glucose, and galactose, with a molar ratio of 1:2.9:9.8 were identified as the active constituents in bioflocculant. The structure of the long backbone with active sites of polysaccharides was determined as a primary basis for the high flocculation activity. Bioflocculant ETH-2 is cation independent, pH tolerant, and thermally stable, suggesting a potential fit for industrial application.
DOI	10.1371/journal.pone.0114591
发表期刊	PLOS ONE
ISSN	1932-6203
卷号	9期号:12页码:19
通讯作者	Song, LY (reprint author), Chinese Acad Sci, Res Ctr Environm Microbiol & Ecol, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000346907600079
语种	英语