期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 541, 期 -, 页码 1439-1447出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.10.010
关键词
Biodegradation; Micropollutants; Nitrifiers; Pharmaceuticals; Sorption; Wastewater treatment
资金
- Spanish Ministry of Economy and Competitiveness through INNOTRAZA project [CTQ2010-20240]
- Ramon y Cajal postdoctoral contract [RYC-2012-10397]
- Xunta de Galicia through MicroDAN project [EM 2012/087]
- FEDER
The effect of nitrification, nitratation and heterotrophic conditions on the biotransformation of several pharmaceuticals in a highly enriched nitrifying activated sludge was evaluated in this study by selective activation of ammonia oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and heterotrophic bacteria. Nitrifiers displayed a noticeable capacity to process ibuprofen due to hydroxylation by ammonia monooxygenase (AMO) to produce 2-hydroxy-ibuprofen. Naproxen was also biotransformed under nitrifying conditions. On the other hand, heterotrophic bacteria present in the nitrifying activated sludge (NAS) biotransformed sulfamethoxazole. In contrast, both nitrifying and heterotrophic activities were ineffective against diclofenac, diazepam, carbamazepine and trimethoprim. Similar biotransformation rates of erythromycin, roxithromycin and fluoxetine were observed under all conditions tested. Overall, results from this study give more evidence on the role of the different microbial communities present in activated sludge reactors on the biological removal of pharmaceuticals. (C) 2015 Elsevier B.V. All rights reserved.
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