| Literature DB >> 25069093 |
Fengmin Li1, Lun Lu2, Xiang Zheng3, Huu Hao Ngo4, Shuang Liang5, Wenshan Guo4, Xiuwen Zhang2.
Abstract
Four horizontal subsurface flow constructed wetlands (HSFCWs), named HSFCW1 (three-stage, without step-feeding), HSFCW2 (three-stage, with step-feeding), HSFCW3 (five-stage, without step-feeding) and HSFCW4 (five-stage, with step-feeding) were designed to investigate the effects of dissolved oxygen (DO) and step-feeding on nitrogen removal. High removal of 90.9% COD, 99.1% ammonium nitrogen and 88.1% total nitrogen (TN) were obtained simultaneously in HSFCW4 compared with HSFCW1-3. The excellent TN removal of HSFCW4 was due to artificial aeration provided sufficient DO for nitrification and the favorable anoxic environment created for denitrification. Step-feeding was a crucial factor because it provided sufficient carbon source (high COD: nitrate ratio of 14.3) for the denitrification process. Microbial activities and microbial abundance in HSFCW4 was found to be influenced by DO distribution and step-feeding, and thus improve TN removal. These results suggest that artificial aeration combined with step-feeding could achieve high nitrogen removal in HSFCWs.Entities:
Keywords: Constructed wetland; Denitrification; Dissolved oxygen; Nitrification; Step-feeding
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Year: 2014 PMID： 25069093 DOI： 10.1016/j.biortech.2014.07.004
Source DB: PubMed Journal: Bioresour Technol ISSN： 0960-8524 Impact factor: 9.642