1. Bioflocculant production by culture of Serratia ficaria and its application in wastewater treatment
- Author
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Xue-Fei Sun, Qinyan Yue, Xian-Wei Liu, Baoyu Gao, Shu-Guang Wang, and Wen-Xin Gong
- Subjects
Paper ,Flocculation ,Serratia ,Time Factors ,Environmental Engineering ,Nitrogen ,Polymers ,Industrial Waste ,Bioengineering ,Biology ,Water Purification ,Rivers ,Nephelometry and Turbidimetry ,Cations ,Klebsiella ,Serratia ficaria ,Zeta potential ,Waste Management and Disposal ,Effluent ,Renewable Energy, Sustainability and the Environment ,business.industry ,Chemical oxygen demand ,Temperature ,Environmental engineering ,General Medicine ,Hydrogen-Ion Concentration ,Pulp and paper industry ,Carbon ,Culture Media ,Oxygen ,Wastewater ,Brewing ,Salts ,Sewage treatment ,business - Abstract
A bioflocculant-producing bacterium was isolated from soil and identified as Serratia ficaria . Using optimized culture conditions a flocculating activity of 95.4% was obtained. It was found to be effective for flocculation of a kaolin suspension over weakly acidic pH (5–7); divalent cations (Ca 2+ and Mg 2+ ) enhanced the flocculating activity, while the co-presence of Al 3+ and Fe 3+ resulted the negative effect. Measurements of zeta potential revealed that charge neutralization played an important role in the flocculation. It could flocculate a variety of real wastewaters, including river water, brewery wastewater, meat processing wastewater and soy sauce brewing wastewater. The bioflocculant was also used to treat pulp effluent, and the removal rate of color and chemical oxygen demand (COD) were up to 99.9% and 72.1%, respectively, which were better than traditional chemical flocculants.
- Published
- 2008
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