Abstract
ABSTRACTAn innovative approach for mitigating the micropollutants released by urban WWTP has been evaluated. It consists in applying ozone within an activated sludge system fed by a 50% vol mixture of raw hospital and urban wastewaters. Ozone was injected in the entering raw sewage or in the recycled mixed liquor. This integrated oxidation treatment provides a significant improvement in pharmaceuticals removal compared to biological treatment alone. Additional benefit lies in the simultaneous removal of the contaminants from both the solid and soluble phases. Compared to ozonation applied downstream the biological treatment, this configuration presents interesting advantages on the engineering aspects: improved operability of the biological treatment, control of bulking and odor issues.
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