PMID: 9523451Jan 1, 1997Paper

Enhancement of the biodegradability of model wastewater containing recalcitrant or inhibitory chemical compounds by photocatalytic pre-oxidation

Biodegradation
L Bolduc, W A Anderson

Abstract

m-Dinitrobenzene, diphenylamine and resorcinol, three aromatic compounds found inhibitory or recalcitrant to biological treatments, were chosen as model chemicals for this study on the integration of photocatalytic-biological treatments. The degradation of each of these compounds was achieved by ultraviolet photocatalytic oxidation, leading to the formation of intermediate compounds. The photocatalytic treatment was performed in a TiO2 slurry reactor containing an aqueous solution of one of the three chemicals. The biodegradability of model wastewater treated photocatalytically was measured in terms of BOD1/TOC. Intermediate compounds that appeared at early stages of the photocatalytic degradation of m-dinitrobenzene or diphenylamine seemed to be more inhibitory than the parent compounds but this was not the case for resorcinol. A substantial improvement in BOD1/TOC could be achieved, but it required the mineralization of at least 80% of the organic carbon originally in the water. Microtox toxicity results confirmed the BOD1/TOC trends for diphenylamine.

Citations

Oct 29, 2015·Environmental Technology·Özlem Karahan ÖzgünDerin Orhon
Nov 26, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Beeta SahaN Biswas
Jun 22, 2005·Biosensors & Bioelectronics·Gab-Joo CheeIsao Karube
Jan 27, 2004·Environmental Science & Technology·A SantosJ J Rodríguez

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