Screening and characterization of a bioflocculant produced by Aeromonas sp |
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Authors: | Li Xiao-Ming Yang Qi Huang Kai Zeng Guang-Ming Liao De-Xiang Liu Jin-Jing Long Wen-Fang |
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Institution: | College of Environmental Science and Engineering, Hunan University, Changsha 410082, Hunan, China. xmli@hnu.cn |
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Abstract: | Objective To isolate the bioflocculant-producing bacteria from activated sludge and investigate the flocculating characteristics of the newly isolated bioflocculant. Methods Bacteria were screened from activated sludge samples to isolate bioflocculant-producing bacteria. Flocculating activity was used as a measure of the flocculating capability of the bioflocculant.Results A novel bioflocculant-producing bacterium was isolated, which was identified to belong to genus Aeromonas and named as Aeromonas sp. N11. Flocculating activity increased in the presence of K , Na , or Ca2 . The highest flocculating activities for kaolin suspension were obtained in acidic pH ranges, and optimum pHs for it were 3.0, 4.0, and 5.0 with 1 mmol/L K , Ca , and Na present, respectively. The highest flocculating activities for soil suspension were observed at pH 8.0. The bioflocculant had a good flocculating activity and could achieve a flocculating activity of 92.4% for kaolin suspension at a Conclusion The bioflocculant produced by Aeromonas sp. N11 has strong flocculating activity and high stability, which affords high possibility of its practical use. |
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Keywords: | Aeromonas sp Bioflocculant Biopolymer Flocculation |
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