Journal
WATER RESEARCH
Volume 136, Issue -, Pages 75-83Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.02.061
Keywords
Co-substrate; Photocatalysis; Biodegradation; Biotransformation; Mineralization; Microbial community
Funding
- National Natural Science Foundation of China [51722803, 51578117, 51678270]
- Fundamental Research Funds for the Central Universities [2412016KJ011]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [HC201712]
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Intimately coupled photocatalysis and biodegradation (ICPB) was realized in a macroporous carrier in which a photocatalyst was present on the outer surface, while a biofilm accumulated inside the carrier. In ICPB, photocatalysis products are rapidly biodegraded by a protected biofilm, leading to mineralization of the refractory organics, such as antibiotics. However, mineralization in ICPB could be compromised if the photocatalysis products remain refractory or are inhibitory. To address this, we attempted to increase metabolic activity by providing a readily biodegradable co-substrate (acetate) that could act as a source of energy and electrons to improve biotransformation and mineralization of the refractory antibiotic tetracycline (TCH). When we added acetate during ICPB of TCH, TCH removal increased by similar to 5%, mineralization increased by similar to 20%, and almost all photocatalysis products disappeared. Acetate addition also led to an increase in active biomass, an increase in the biomass's respiratory activity, and evolution of the microbial community to having more members able to biodegrade photocatalysis and biotransformation intermediates. Thus, providing an easily biodegradable co-substrate was an effective means for enhancing TCH removal and mineralization with the ICPB technology. (C) 2018 Elsevier Ltd. All rights reserved.
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