Enhanced nitrogen removal in constructed wetlands: Effects of dissolved oxygen and step-feeding

Li, F; Lu, L; Zheng, X; Ngo, HH; Liang, S; Guo, W; Zhang, X

Enhanced nitrogen removal in constructed wetlands: Effects of dissolved oxygen and step-feeding

Li, F Lu, L Zheng, X Ngo, HH

Liang, S Guo, W

Zhang, X

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Publication Type:: Journal Article
Citation:: Bioresource Technology, 2014, 169 pp. 395 - 402
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Li, F	en_US
dc.contributor.author	Lu, L	en_US
dc.contributor.author	Zheng, X	en_US
dc.contributor.author	Ngo, HH https://orcid.org/0000-0002-0296-2866	en_US
dc.contributor.author	Liang, S	en_US
dc.contributor.author	Guo, W https://orcid.org/0000-0001-5542-2858	en_US
dc.contributor.author	Zhang, X	en_US
dc.date.available	2020-05-25T19:04:14Z
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Bioresource Technology, 2014, 169 pp. 395 - 402	en_US
dc.identifier.issn	0960-8524	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33362
dc.identifier.uri	http://hdl.handle.net/10453/37046
dc.description.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. © 2014 Elsevier Ltd.	en_US
dc.relation.ispartof	Bioresource Technology	en_US
dc.relation.isbasedon	10.1016/j.biortech.2014.07.004	en_US
dc.subject.classification	Biotechnology	en_US
dc.subject.mesh	Bacteria	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Nitrogen	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Analysis of Variance	en_US
dc.subject.mesh	Rheology	en_US
dc.subject.mesh	Waste Disposal, Fluid	en_US
dc.subject.mesh	Aerobiosis	en_US
dc.subject.mesh	Biodegradation, Environmental	en_US
dc.subject.mesh	Wetlands	en_US
dc.subject.mesh	Biological Oxygen Demand Analysis	en_US
dc.subject.mesh	Waste Water	en_US
dc.title	Enhanced nitrogen removal in constructed wetlands: Effects of dissolved oxygen and step-feeding	en_US
dc.type	Journal Article
utslib.citation.volume	169	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	169	en_US

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. © 2014 Elsevier Ltd.

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http://hdl.handle.net/10453/33362