Degradation of bisphenol A by microorganisms immobilized on polyvinyl alcohol microspheres

Abstract

In this study, microorganisms (named B111) were immobilized on polyvinyl alcohol microspheres prepared by the inverse suspension crosslinked method. The biodegradation of bisphenol A (BPA) and 4-hydroxybenzaldehyde, a degradation product of BPA, by free and immobilized B111 was investigated. The BPA degradation studies were carried out at initial BPA concentrations ranging from 25 to 150 mg·L^-1. The affinity constant K_s and maximum degradation rate R_max were 98.3 mg·L^-1 and 19.7 mg·mg^-1VSS·d^-1 for free B111, as well as 87.2 mg·L^-1 and 21.1 mg·mg^-1VSS·d^-1 for immobilized B111, respectively. 16S rDNA gene sequence analyses confirmed that the dominant genera were Pseudomonas and Brevundimonas for BPA biodegradation in microorganisms B111.

Keywords

bisphenol A / polyvinyl alcohol / immobilized microorganisms / 4-hydroxybenzaldehyde

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Acknowledgements

The authors gratefully acknowledge the support provided by special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control (09Z01ESPCT), Major Projects on Control and Rectification of Water Body Pollution (2008ZX07313-008), the National Key Technologies R&D Program of China (2012BAB03B04) , and the National Basic Research Program of China (Grant No. 2008CB418202).

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