Effect of acclimation and nutrient supply on 5-tolyltriazole biodegradation with activated sludge communities

The corrosion inhibitor 5-tolyltriazole (5-TTri) can have a detrimental impact on aquatic systems thus implying an acute need to reduce the effluent concentrations of 5-TTri. In this study, 5-TTri biodegradation was enhanced through acclimation and nutrient supply. Activated sludge communities (ASC) were setup in nine subsequent ASC generations. While generation two showed a lag phase of five days without biodegradation, generations four to nine utilized 5-TTri right after inoculation, with biodegradation rates from 33 to 5.2 mg L-1 d(-1). Additionally, centrifuged AS supernatant was used to simulate the nutrient conditions in wastewater. This sludge supernatant (SS) significantly enhanced biodegradation, resulting in removal rates ranging from 3.2 to 5.0 mg L-1 d(-1) without acclimation while the control groups without SS observed lower rates of 2.2 mg L-1 d(-1). (C) 2014 Elsevier Ltd. All rights reserved.