Design Model for COD Removal in Constructed Wetlands Based on Biofilm Activity

Current design criteria for free-water-surface constructed wetlands are based on either empirical relationships or first-order reaction rates and do not emphasize the microbial activity. This study was conducted to evaluate the role of biofilm bacteria present in free-water-surface constructed wetla...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 1998-09, Vol.124 (9), p.838-843
Main Authors: Polprasert, C, Khatiwada, N. R, Bhurtel, J
Format: Article
Language:English
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TECHNICAL PAPERS
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Summary:Current design criteria for free-water-surface constructed wetlands are based on either empirical relationships or first-order reaction rates and do not emphasize the microbial activity. This study was conducted to evaluate the role of biofilm bacteria present in free-water-surface constructed wetland beds in the removal of organic matter. A kinetic model incorporating the biofilm kinetics and dispersion number was proposed to predict chemical oxygen demand removal in free-water-surface constructed wetlands. The model parameters were determined from laboratory experiments and from the literature. The proposed kinetic model satisfactorily predicted chemical oxygen demand removal efficiencies in a pilot-scale constructed wetland unit located in the tropics. A design chart and a design example based on the kinetic model are given.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(1998)124:9(838)