Constructed Wetlands for Water Pollution Control - Processes, Paramaters and Performance

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Title Constructed Wetlands for Water Pollution Control - Processes, Paramaters and Performance
Author Greenway, Margaret
Journal Name Developments in Chemical Engineering and Mineral Processing: The Australasian Research Journal
Editor Moses Tade, Martyn Ray
Year Published 2004
Place of publication Australia
Publisher Curtin University of Technology, Department of Chemical Engineering
Abstract constructed wetlands are now recognised as an ecologically sustainable option for water pollution control. Natural wetlands are biologically diverse ecosystem. They provide an array of physical, biological and chemical processes to facilitate the removal, recycling, transformation or immobilisation of sediment and nutrients. Most of these processes are facilitated by the wetland vegetation, associated biofilms and micro-organisms. Wetland ecosystems are complex and the interactions between abiotic and biotic components are fundamental to an understanding of the treatment processes. Constructed wetlands must therefore be designed to have the attributes of natural wetland ecosystems. The treatment efficiency of a wetland system requires a balance between pollutant loading rate and hydraulic retention time, which is also affected by the water quality and quantity of wastewater effluent or stormwater runoff: The size of a wetland will depend upon the volume of runoff, pollutant characteristics, desired level of treatment and the extent to which the wetland is expected to function as a flood retention basin. Water depth and extent of inundation will determine the types and species of aquatic plants. A combination of emergent, submerged and floating species should be selected. Pretreatment and detention times are crucial parameters to maximise pollutant removal efficiency. Sedimentation ponds are important in stormwater wetlands to remove particulates, but dense vegetated macrophyte zones are essential to enhance the removal of suspended solids and nutrients. Ecologists and engineers need to work together to maximise the treatment efficiency of constructed wetlands. Planners and landscape architects' must become involved to ensure that stormwater wetlands have a multi-functional role in the urban setting. Constructed wetlands offer the ideal challenge to environmental engineers allowing for the integration of engineering and ecological principles to find the technical solution to fit both nature and society.
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Copyright Statement Copyright 2004 John Wiley & Sons, Ltd. Self-archiving of the author-manuscript version is not yet supported by this publisher. Please refer to the journal link for access to the definitive, published version or contact the author for more information.
Volume 12
Issue Number 5/6
Page from 491
Page to 504
ISSN 0969-1855
Date Accessioned 2005-03-29
Language en_AU
Faculty Faculty of Environmental Sciences
Subject PRE2009-Environmental Sciences
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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