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Characterization of bioflocculant MBF3-3 produced by an isolated Bacillus sp.

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Summary

The characteristics of bioflocculant MBF3-3 produced by Bacillus sp. BF3-3 were investigated here. MBF3-3 showed excellent flocculating activity on real and synthetic wastewaters, and consumed a much lower dosage than that of the widely used polyaluminum chloride (PAC) when flocculating brewery wastewater. Except Fe3+, metal ions, including Al3+, Mg2+, Ca2+, K+ and Na+, can stimulate the flocculating activity of MBF3-3 obviously, and the stimulating effects increased in the order: monovalent < bivalent < trivalent. MBF3-3 was mainly composed of acidic polysaccharide (66.1%) and protein (29.3%), in which acidic polysaccharide was the main effective flocculating component. OH and COO– groups may play a vital role in the flocculation of suspended particles.

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Acknowledgments

The authors want to acknowledge the contributions of X. Luo undergraduate students for assisting with the experiments.

Author information

Correspondence to Daolun L. Feng.

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Feng, D.L., Xu, S.H. Characterization of bioflocculant MBF3-3 produced by an isolated Bacillus sp.. World J Microbiol Biotechnol 24, 1627 (2008). https://doi.org/10.1007/s11274-008-9654-1

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Keywords

  • Bioflocculant
  • Flocculating properties
  • Bacillus sp.