Performance Evaluation of First-Order Hydraulic Models for COD Removal in Horizontal Subsurface-Flow Constructed Wetlands

Autor(es)

Thomaz Queluz, Joao Gabriel ^[1] ; Drizo, Aleksandra ^[2] ; Sanchez-Roman, Rodrigo Maximo ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Dept Rural Engn, Sch Agr, Rua Jose Barbosa de Barros 1780, BR-18610307 Botucatu, SP - Brazil

^[2] Heriot Watt Univ, Sch Energy Geosci Infrastruct & Soc, Edinburgh EH14 4AS, Midlothian - Scotland

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL ENGINEERING; v. 143, n. 10 OCT 2017.
• Citações Web of Science: 0

Resumo

The aims of the present study are to verify the performance of four first-order hydraulic models and identify the model that best described the kinetics of the chemical oxygen demand (COD) removal in constructed wetlands. Three horizontal subsurface-flow constructed wetlands (HSSFCWs) were examined: two were planted with Typha latifolia and one was left unplanted. Each HSSFCW received 50 L of secondary effluent daily, resulting in a hydraulic retention time of 3.2 days. The COD concentrations were determined throughout the HSSFCWs and compared in terms of the coefficient of determination with estimated values provided by hydraulic models. The performance of the models was verified under two different conditions: (1) without, and (2) with evapotranspiration (ET) effects. Among the studied models, the plug-flow hydraulic model revealed the poorest performance, whereas the modified plug-flow model (incorporating the coefficient of decay resistance) was the model that best described COD removal kinetics throughout the HSSFCW. The incorporation of water losses by ET improved the performance of all of studied models. (C) 2017 American Society of Civil Engineers. (AU)

• Processo FAPESP: 14/05997-6 - Modelagem dinâmica de alagado construído para o tratamento de águas residuárias domésticas em comunidades isoladas
• Beneficiário: Rodrigo Maximo Sanchez Roman
• Modalidade de apoio: Auxílio à Pesquisa - Regular