Abstract
Synthetic wastewater containing a mixture of 10 different chloro and nitro aromatic pollutants was treated in batch ozonations and in a continuous combined ozonation-biodegradation system. The pH dependency of elimination of individual aromatics and of total organic carbon (TOC)was studied in batch ozonations. Experiments at pH 7 showed higher degradation and elimination rates than those at pH 2 and pH 12. A rapid increase of the dissolved ozone concentration after elimination of the aromatics was observed. This was very useful for on-line control of the combined process. Ozonation products were shown to be highly biodegradable through high oxygen uptake rates of biomass. Total mineralization of recalcitrant chloro and nitro aromatics was observed in the combined ozonation-biotreatment. Most significant improvement of ozone efficiency was obtained by controlling dissolved ozone concentration at optimal levels. A slight further enhancement was observed by recycling the liquid between the bioreactor and the ozone reactor.
Published Version
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