Kinetic modelling of nitrogen and organics removal in vertical and horizontal flow wetlands

Saeed, Tanveer, and Sun, Guangzhi (2011) Kinetic modelling of nitrogen and organics removal in vertical and horizontal flow wetlands. Water Research, 45 (10). pp. 3137-3152.

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Abstract

This paper provides a comparative evaluation of the kinetic models that were developed to describe the biodegradation of nitrogen and organics removal in wetland systems. Reaction kinetics that were considered in the model development included first order kinetics, Monod and multiple Monod kinetics; these kinetics were combined with continuous-stirred tank reactor (CSTR) or plug flow pattern to produce equations to link inlet and outlet concentrations of each key pollutants across a single wetland. Using three statistical parameters, a critical evaluation of five potential models was made for vertical and horizontal flow wetlands. The results recommended the models that were developed based on Monod models, for predicting the removal of nitrogen and organics in a vertical and horizontal flow wetland system. No clear correlation was observed between influent BOD/COD values and kinetic coefficients of BOD5 in VF and HF wetlands, illustrating that the removal of biodegradable organics was insensitive to the nature of organic matter. Higher effluent COD/TN values coincided with greater denitrification kinetic coefficients, signifying the dependency of denitrification on the availability of COD in VF wetland systems. In contrast, the trend was opposite in HF wetlands, indicating that availability of NO3-N was the main limiting step for nitrogen removal. Overall, the results suggested the possible application of the developed alternative predictive models, for understanding the complex biodegradation routes of nitrogen and organics removal in VF and HF wetland systems.

Item ID: 18181
Item Type: Article (Research - C1)
ISSN: 1879-2448
Keywords: constructed wetlands, denitrification, kinetics, nitrification, organics removal, wetland modelling
Date Deposited: 30 Aug 2011 05:50
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090509 Water Resources Engineering @ 75%
09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 25%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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