Effect of ozonation on the biodegradability of urban wastewater treatment plant effluent.

The present work aimed to study the effect of ozonation on the organic sum parameters linked to enhanced biodegradability. Laboratory experiments were conducted with the effluent of four Austrian urban wastewater treatment plants with low food to microorganism ratios and different matrix characteristics. Biochemical oxygen demand over 5 days (BOD) was measured before ozonation and after application of different specific ozone doses (D) (0.