Combined MBR-Ozonation Process for Color Removal in Textile Wastewater: Full Scale Implications From a Pilot Study

Abstract

Bubble column tests were conducted to compare the efficiency of ozone tertiary color removal for conventional activated sludge (CAS) gravity clarified effluent, sand filtered CAS effluent and immersed membrane bioreactor (iMBR) effluent. The ozone requirement to achieve the 200 mg/L platinum-cobalt color units (CU) target for the iMBR system was 26% that of the CAS system. The requirement for the sand filtered effluent was 42% of the CAS effluent. The lowest cost system was sand filtration, with a 18% savings compared to the base case.