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Variable residence time-based model for BOD removal in free-water surface wetlands

Deng, Zhiqiang; Sebro, Degefu Y.; Aboukila, Alaa Farouk and Bengtsson, Lars LU (2016) In Ecological Engineering 97. p.334-343
Abstract

Constructed wetlands have been increasingly used for treatment of secondary wastewater containing various contaminants. This paper presents a Variable Residence Time (VART)-based model, called VART-BOD model, for simulation of BOD removal processes in constructed wetlands with free water surface (FWS). Mathematically, the VART-BOD model describes a free water surface wetland with three vertical layers, including vegetated water column layer, advection-dominated upper root layer, and diffusion-dominated lower root layer. Biogeochemically, the VART-BOD model simulates various BOD removal processses and mechanisms, including monod kinetics of bacterial growth, mass exchange between water column and root layers, advection, dispersion, and... (More)

Constructed wetlands have been increasingly used for treatment of secondary wastewater containing various contaminants. This paper presents a Variable Residence Time (VART)-based model, called VART-BOD model, for simulation of BOD removal processes in constructed wetlands with free water surface (FWS). Mathematically, the VART-BOD model describes a free water surface wetland with three vertical layers, including vegetated water column layer, advection-dominated upper root layer, and diffusion-dominated lower root layer. Biogeochemically, the VART-BOD model simulates various BOD removal processses and mechanisms, including monod kinetics of bacterial growth, mass exchange between water column and root layers, advection, dispersion, and diffusion. A unique feature of the VART-BOD model is the incorporation of a dynamic diffusion-dominated root-zone. The VART-BOD model was tested with data collected from two distinct FWS wetlands: Gustine Wetland, USA and Manzala Wetland, Egypt. Testing results showed that the coefficient of determination (r2) and root mean square error (RMSE) values vary in the ranges of 0.73–0.99 and 0.41–8.70 mg/L, respectively, for Gustine Wetland cells while r2 = 0.98 and RMSE = 0.72 mg/L for Manzala Wetland. The VART-BOD model is a reliable and efficient tool for designing constructed wetlands and for understanding effects of various processes and mechanisms on the treatment efficiency of wastewater in constructed wetlands.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
BOD removal, Constructed wetlands, Dynamic diffusion-dominated root layer, Model
in
Ecological Engineering
volume
97
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:84991720713
  • wos:000388580200035
ISSN
0925-8574
DOI
10.1016/j.ecoleng.2016.10.037
language
English
LU publication?
yes
id
6c5a9e76-72a4-4d53-9bbd-e867cb9c80d1
date added to LUP
2016-11-04 09:46:10
date last changed
2017-11-19 04:34:31
@article{6c5a9e76-72a4-4d53-9bbd-e867cb9c80d1,
  abstract     = {<p>Constructed wetlands have been increasingly used for treatment of secondary wastewater containing various contaminants. This paper presents a Variable Residence Time (VART)-based model, called VART-BOD model, for simulation of BOD removal processes in constructed wetlands with free water surface (FWS). Mathematically, the VART-BOD model describes a free water surface wetland with three vertical layers, including vegetated water column layer, advection-dominated upper root layer, and diffusion-dominated lower root layer. Biogeochemically, the VART-BOD model simulates various BOD removal processses and mechanisms, including monod kinetics of bacterial growth, mass exchange between water column and root layers, advection, dispersion, and diffusion. A unique feature of the VART-BOD model is the incorporation of a dynamic diffusion-dominated root-zone. The VART-BOD model was tested with data collected from two distinct FWS wetlands: Gustine Wetland, USA and Manzala Wetland, Egypt. Testing results showed that the coefficient of determination (r<sup>2</sup>) and root mean square error (RMSE) values vary in the ranges of 0.73–0.99 and 0.41–8.70 mg/L, respectively, for Gustine Wetland cells while r<sup>2</sup> = 0.98 and RMSE = 0.72 mg/L for Manzala Wetland. The VART-BOD model is a reliable and efficient tool for designing constructed wetlands and for understanding effects of various processes and mechanisms on the treatment efficiency of wastewater in constructed wetlands.</p>},
  author       = {Deng, Zhiqiang and Sebro, Degefu Y. and Aboukila, Alaa Farouk and Bengtsson, Lars},
  issn         = {0925-8574},
  keyword      = {BOD removal,Constructed wetlands,Dynamic diffusion-dominated root layer,Model},
  language     = {eng},
  month        = {12},
  pages        = {334--343},
  publisher    = {Elsevier},
  series       = {Ecological Engineering},
  title        = {Variable residence time-based model for BOD removal in free-water surface wetlands},
  url          = {http://dx.doi.org/10.1016/j.ecoleng.2016.10.037},
  volume       = {97},
  year         = {2016},
}