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The relevance of bisphenol A adsorption during Fenton's oxidation Žgajnar Gotvajn, A.; Bistan, M.; Tišler, T.; Englande, A. J. & Zagorc-Končan, J. Abstract The aim of this research was to assess the efficiency of Fenton's oxidation for degradation of endocrine disruptor bisphenol A (BPA) with emphasis on extent of accompanying adsorption. Adsorption on the waste sludge resulting from the Fenton's oxidation could represent a significant impact on the final removal efficiency of BPA. Fenton's oxidation was accomplished at two con- centrations of BPA (0.228 and 22.8 mg L-1); both at the selected molar ratio of reagents Fe2+:H2O2(1:10), as a function of reaction time. The kinetics of adsorption of BPA on waste sludge was determined for the same two concentrations of BPA at two concentrations of waste sludge (0.1 and 6.0 g L-1). In addition to changing concentrations of BPA and sludge, the adsorption process was also influenced by parameters such as temperature, pH and contact time. Adsorption isotherms were determined. Oxidation and adsorption were monitored by gas chroma- tography combined with mass spectrum. It has been con- firmed that BPA is not completely oxidized in Fenton's oxidation, because it is adsorbed to formed waste ferric sludge and thus necessary precautions for sludge deposition must be observed Keywords Adsorption; Bisphenol A; Endocrine disrupters; Fenton's oxidation; Kinetic model

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