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Water Science & Technology—WST Vol 62 No 8 pp 1907–1913 © IWA Publishing 2010 doi:10.2166/wst.2010.478 Flocculation properties of a bioflocculant produced by Bacillus licheniformisB. Ji, X. Y. Zhang, Z. Li, H. Q. Xie, X. M. Xiao and G. J. FanThe Institute of Water Environment and Ecological Restoration, China Water Resources Pearl River Planning Surveying and Designing Co., Ltd, Guangzhou 510610, China E-mail: lizhongshan100@yahoo.com.cnCollege of Environmental Science and Engineering, Hohai University, Nanjing 210098, China South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China ABSTRACT Studies of the flocculation properties of bioflocculant combined with its structure characterization are helpful to develop more effective bioflocculant. This paper reports findings of our research on the flocculation properties of the bioflocculant ZS-7 in the kaolin suspension based on its structure characterization. With the addition of 2 mg/L ZS-7 and 9 mM CaCl2, the optimum temperature for flocculation performance of ZS-7 in the kaolin suspension is about 30°C, giving the highest flocculating activity 99.2%. Studies of the flocculation properties revealed that it was stable at 60–100°C and pH 4–10. Moreover, it could flocculate a kaolin suspension over a wide range of pH (2–12) and temperatures (4–95°C) in the presence of CaCl2. Keywords: Bacillus licheniformis; Bioflocculant; flocculating activity; flocculation properties eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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