Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics

Mitchell, C; McNevin, D

Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics

Mitchell, C

McNevin, D

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Publication Type:: Journal Article
Citation:: Water Research, 2001, 35 (5), pp. 1295 - 1303
Issue Date:: 2001-01-01

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Field	Value	Language
dc.contributor.author	Mitchell, C https://orcid.org/0000-0001-9842-540X	en_US
dc.contributor.author	McNevin, D https://orcid.org/0000-0003-1665-3367	en_US
dc.date.issued	2001-01-01	en_US
dc.identifier.citation	Water Research, 2001, 35 (5), pp. 1295 - 1303	en_US
dc.identifier.issn	0043-1354	en_US
dc.identifier.uri	http://hdl.handle.net/10453/3918
dc.description.abstract	A new, mechanistic approach for design and analysis of subsurface flow (SSF) constructed wetlands is presented. The model is based on the assumption that the biological processes in wetlands, like other biological systems, exhibit Monod kinetics. A Monod approach fits well with observed wetland performance. It predicts first-order behaviour at low concentrations, that is, pollutant removal rates which increase with increasing pollutant concentration; and zero-order or saturated behaviour at high pollutant concentrations, that is, a maximum pollutant removal rate. A kinetic analysis of subsurface flow constructed wetlands exhibiting Monod kinetics reveals that loading rate, as well as the zero-order degradation rate constant, are essential parameters for efficient wetlands design for the removal of organic carbon. In particular, Monod kinetics enables the identification of an absolute maximum removal rate which is necessary to prevent undersizing in design. This is significant because it represents a theoretical upper bound on loading rate for wetlands design. The analysis is applied to wetlands data collected in North America by the US EPA in order to extract design criteria for BOD removal. It reveals that maximum loadings for SSF wetlands are at least 80kgha-1d-1 for BOD. In addition, a new dimensionless performance efficiency parameter, Ω, is presented as a more effective means of comparing wetland performance. Copyright © 2001 Elsevier Science Ltd.	en_US
dc.relation.ispartof	Water Research	en_US
dc.relation.isbasedon	10.1016/S0043-1354(00)00373-0	en_US
dc.subject.classification	Environmental Engineering	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Reproducibility of Results	en_US
dc.subject.mesh	Oxygen Consumption	en_US
dc.subject.mesh	Kinetics	en_US
dc.subject.mesh	Models, Theoretical	en_US
dc.subject.mesh	United States Environmental Protection Agency	en_US
dc.subject.mesh	North America	en_US
dc.subject.mesh	United States	en_US
dc.subject.mesh	Biodegradation, Environmental	en_US
dc.title	Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	35	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
pubs.organisational-group	/University of Technology Sydney/DVC (Research)/Institute For Sustainable Futures
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CFS - Centre for Forensic Science
pubs.organisational-group	/University of Technology Sydney/Strength - ISF - Institute for Sustainable Futures
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	35	en_US

Abstract:

A new, mechanistic approach for design and analysis of subsurface flow (SSF) constructed wetlands is presented. The model is based on the assumption that the biological processes in wetlands, like other biological systems, exhibit Monod kinetics. A Monod approach fits well with observed wetland performance. It predicts first-order behaviour at low concentrations, that is, pollutant removal rates which increase with increasing pollutant concentration; and zero-order or saturated behaviour at high pollutant concentrations, that is, a maximum pollutant removal rate. A kinetic analysis of subsurface flow constructed wetlands exhibiting Monod kinetics reveals that loading rate, as well as the zero-order degradation rate constant, are essential parameters for efficient wetlands design for the removal of organic carbon. In particular, Monod kinetics enables the identification of an absolute maximum removal rate which is necessary to prevent undersizing in design. This is significant because it represents a theoretical upper bound on loading rate for wetlands design. The analysis is applied to wetlands data collected in North America by the US EPA in order to extract design criteria for BOD removal. It reveals that maximum loadings for SSF wetlands are at least 80kgha-1d-1 for BOD. In addition, a new dimensionless performance efficiency parameter, Ω, is presented as a more effective means of comparing wetland performance. Copyright © 2001 Elsevier Science Ltd.

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http://hdl.handle.net/10453/3918