Abstract
In this study, simultaneous pre and post-ozonation processes combined biological attached growth reactor were used in order to investigate the removal of COD, ammonium and total coliforms from real municipal wastewater. The biological process was carried out in a fixed bed aerobic bioreactor with an aeration rate of 6 L/min and hydraulic retention time of 5 h. The ozonation process was performed simultaneously in pre-ozonation and post-ozonation reactors, with 1 g/h ozone mass flow within 30 min every 8 h. The results showed that complete ammonium removal and 94 % COD removal were obtained. Also, total coliforms in the final effluent were measured to be about 0.51 MPN/mL. The analysis of energy consumption showed that the ozonation process was the dominant energy consumption source. The combination of fixed bed bioreactor and ozonation process showed a promising technology for the treatment of real municipal wastewater.
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