A Mixed Zone Transport Model Of Flow Through A Constructed Wetland

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Title A Mixed Zone Transport Model Of Flow Through A Constructed Wetland
Author Jenkins, Graham Andrew
Publication Title 17th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research
Editor Prof Bruce Melville and A/Prof Gregory de Costa
Year Published 2010
Place of publication Auckland, New Zealand
Publisher International Association of Hydraulic Engineering and Research
Abstract Free water surface wetlands are widely used for the treatment of both wastewater and urban stormwater. The treatment of contaminants in these wetland systems rely on physical, chemical and biological processes that take place as the water flows through the system. The efficacy of these treatment processes is dependant upon the residence time of water within the system. Flow through these treatment reactors is rarely equivalent to plug flow, and generally a distribution of residence times is observed. This paper describes a numerical modelling approach that has been developed to describe the flow of water through a constructed wetland treatment reactor. The model combines a mixed zone tank reactor, with a conceptual flow reactor described by a Muskingum transport model. The modelling approach has been used to model the tracer response curves produced from a simple laboratory flow reactor and from a two-dimensional numerical flow model of a hypothetical rectangular wetland. It is shown that the modelling approach replicates the distribution of residence times observed in these systems, which are characterised by a steep rise, followed by a long receding tail. Furthermore, the approach is shown to be superior to the use of continuously stirred tank reactors in the modelling of these flow processes. The model parameters are also shown to be functions of the length to width ratio of the treatment reactor.
Peer Reviewed No
Published Yes
Publisher URI http://www.iahr.net/site/index.html
ISBN 0868691259
Conference name 17th Congress of the Asia and Pacific Division of the International Association of Hydraulic Enginee
Location Auckland, New Zealand
Date From 2010-02-21
Date To 2010-02-24
URI http://hdl.handle.net/10072/39126
Date Accessioned 2010-10-22
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Engineering Modelling
Publication Type Conference Publications (Full Written Paper - Non-Refereed)
Publication Type Code e2

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