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Increased Metabolic Energy Requirements Characterize the Recovery of Ammonia Oxidizing Community Following Cadmium Stress

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This study that investigates the impact of cadmium (Cd) stress on a crucial functional group in the activated sludge consortium, the ammonia oxidizing bacteria (AOB). The laboratory set-up consists of 3 identical continuous flow complete mixed activated sludge systems. Two systems were shocked with Cd, while the third system served as an unstressed control. Nitrification was significantly affected by Cd during the stress events as exhibited by the increase in effluent ammonia levels. Cd stressed reactors showed a fast recovery followed by a significant increase in ammonia oxidation activity as compared to the unstressed control. This pattern was reproducible for both shocked reactors during three independent shock events and could be attributed to an increased energy demand due to the expression of stress response functions or increased energy uptake efficiency resulting from reduced AOB diversity. Molecular investigations to elucidate the mechanisms behind the observed trends are in progress.

Document Type: Research Article


Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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