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Title: Longitudinal dispersion in a horizontal subsurface flow constructed wetland: a numerical solution
Authors: Araújo, Adérito 
Sousa, Ercília 
Albuquerque, António 
Keywords: Finite differences; Dead zone model; Constructed wetland; Hydrodynamic characteristics
Issue Date: 2008
Publisher: Centro de Matemática da Universidade de Coimbra
Citation: Pré-Publicações DMUC. 08-18 (2008)
Abstract: We present a numerical solution for the dead zone model which describes the solute transport in a subsurface and horizontal flow constructed wetland. This model is a system of two mass balance equations for two conceptual areas: the main channel and the storage zone. We use finite difference schemes to determine the numerical solution of the system and we study its convergence by presenting properties related to the stability and accuracy of the schemes. Concerning the experimental results, the magnitude of the longitudinal dispersion and the extension of dead volumes is estimated for clean conditions and after a certain operating period under organic loading conditions. The results showed a considerable amount of longitudinal dispersion through the bed, which was very strong near the feeding point, indicating the occurrence of mixing and significant presence of dead zones and short-circuiting.
Rights: openAccess
Appears in Collections:FCTUC Matemática - Vários

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