期刊
BIORESOURCE TECHNOLOGY
卷 197, 期 -, 页码 410-415出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.08.135
关键词
Nitrate reduction; Ferrous oxidation; Bioaugmentation; Heterotrophic denitrifying sludge
资金
- National Natural Science Foundation of China [51278457]
- National Key Technology R&D Program of China [2013BAD21B04]
- Key Science and Technology Innovation Team Grant of Zhejiang [2013TD12]
Nitrate-dependent anaerobic ferrous oxidation (NAFO) is a new and valuable bio-process for the treatment of wastewaters with low C/N ratio, and the NAFO process is in state of the art. The heterotrophic denitrifying sludge (HDS), possessing NAFO activity, was used as bioaugmentation to enhance NAFO efficiency. At a dosage of 6% (V/V), the removal of nitrate and ferrous was 2.4 times and 2.3 times of as primary, and the volumetric removal rate (VRR) of nitrate and ferrous was 2.4 times and 2.2 times of as primary. Tracing experiments of HDS indicated that the bioaugmentation on NAFO reactor was resulted from the NAFO activity by HDS itself. The predominant bacteria in HDS were identified as Thauera (52.5%) and Hyphomicrobium (20.0%) which were typical denitrifying bacteria and had potential ability to oxidize ferrous. In conclusion, HDS could serve as bioaugmentation or a new seeding sludge for operating high-efficiency NAFO reactors. (C) 2015 Elsevier Ltd. All rights reserved.
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