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Assessment of Suspended Solid Removal in a Surface Flow Constructed Wetland Using a Three-Dimensional Numerical Model

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  • Sang-Soo Han
  • Zhi Chen
  • Fa-Yi Zhou
  • Xiu-Qing Lu

Abstract

Surface flow constructed wetlands (SFCWs) have been widely used to treat various types of wastewater and stormwater due to the advantages such as low costs for operating and maintenance compared with conventional treatment systems. In SFCW, the flow pattern, which is determined by the geometric features including bed morphology and vegetation distribution, significantly influences the removal processes of suspended solids and other pollutants. In this study, a three-dimensional computational fluid dynamics model, that integrates hydrodynamic model and the Lagrangian particle tracking model, is applied to determine the effectiveness of a SFCW in removing suspended solids based on the predicted flow characteristics and distribution of suspended solids in the wetland. After the validation, the three-dimensional numerical model is applied to illustrate the three-dimensional internal flow pattern in the wetland. The predicted concentrations of suspended solids at several cross-sections in downstream direction are compared with the field sampling data and also the results from a traditional first-order decay model. The results show that the 3D model performs reasonably well predicting complex flow fields associated with complex wetland geometry. This study indicates that the 3D model is an effective tool to support the management and operation of field SFCWs. Also, it can help to improve the design of SFCWs providing better understanding of interactions among the geometric features, the flow characteristics and the contaminants behaviors. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • Sang-Soo Han & Zhi Chen & Fa-Yi Zhou & Xiu-Qing Lu, 2014. "Assessment of Suspended Solid Removal in a Surface Flow Constructed Wetland Using a Three-Dimensional Numerical Model," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(10), pages 3111-3125, August.
    • Handle: RePEc:spr:waterr:v:28:y:2014:i:10:p:3111-3125
    DOI: 10.1007/s11269-014-0658-3
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    References listed on IDEAS

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    1. Maria A. Economopoulou & Vassilios A. Tsihrintzis, 2004. "Design Methodology of Free Water Surface Constructed Wetlands," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 18(6), pages 541-565, December.
    2. Vassilios Tsihrintzis & Rizwan Hamid, 1997. "Modeling and Management of Urban Stormwater Runoff Quality: A Review," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 11(2), pages 136-164, April.
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