Document Detail


Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics.
MedLine Citation:
PMID:  11268849     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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 80 kg ha-1 d-1 for BOD. In addition, a new dimensionless performance efficiency parameter, omega, is presented as a more effective means of comparing wetland performance.
Authors:
C Mitchell; D McNevin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water research     Volume:  35     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-03-27     Completed Date:  2001-07-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1295-303     Citation Subset:  IM    
Affiliation:
Department of Chemical Engineering, Building J01, University of Sydney NSW 2006, Australia. cynthia@chem.eng.usyd.edu.au
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MeSH Terms
Descriptor/Qualifier:
Biodegradation, Environmental*
Kinetics
Models, Theoretical*
North America
Oxygen Consumption*
Reproducibility of Results
United States
United States Environmental Protection Agency
Water Pollutants, Chemical / analysis*,  pharmacokinetics*
Chemical
Reg. No./Substance:
0/Water Pollutants, Chemical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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