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A pilot-scale coupling of ozonation and biodegradation of 2,4-dichlorophenol-containing wastewater: The effect of biomass acclimation towards chlorophenol and intermediate ozonation products
Journal Contribution - Journal Article
© 2017 Elsevier Ltd The effect of pre-ozonation of a synthetic wastewater spiked with 2,4-dichlorophenol prior to a biological treatment was investigated experimentally by using a pilot-scale bioreactor. The pre-ozonated wastewater was characterized by a brown color, probably due to the formation of typical intermediate products such as quinones or their derivatives. Because also under steady conditions a brown effluent of the bioreactor was observed, accompanied with an increased chemical oxygen demand of the effluent, it was assumed that the intermediate products were not completely biodegradable. However, a decreasing sludge volume index indicated the enhanced sludge settleability. Without pre-treatment, the complete biodegradation of 2,4-dichlorophenol occurred. However, due to the presence of small particles, the effluent was not clear, even not after centrifugation. Moreover, the higher sludge volume index indicated the hampered settling of the sludge. Under both investigated circumstances, the nitrification and denitrification process was not affected.
Journal: Journal of Cleaner Production
Pages: 1432 - 1441