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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