Industrial & Engineering Chemistry Research, Vol.52, No.26, 9301-9307, 2013
Removal of Bisphenol A and its Oxidation Products from Aqueous Solutions by Sequential Catalytic Wet Air Oxidation and Biodegradation
Model aqueous solution of bisphenol A (BPA) of 10 mg L-1 was treated in a continuous and sequential catalytic wet air oxidation (CWAO)/aerobic bioreactor (BR) system. Wet oxidation with titanate nanotube-based catalyst resulted in nearly complete removal of BPA (>99%) at a very short space time of 0.3 min.g(CAT).g(-1). The main identified oxidation products in the CWAO effluent were acetic acid, formic acid and p-hydroxyacetophenone (p-HAP). All of these compounds were consequently and efficiently removed in the BR system at a hydraulic residence time (HRT) of 7.2 h. Although apparent toxicity of the CWAO effluent was found higher than of the initial BPA solution, the former could be successfully detoxified through aerobic biodegradation. The combined system thus presents a potential treatment process for the efficient removal of BPA and its oxidative derivatives from wastewaters.