Chapter
May 18, 2016
Impact of Sludge Layer Geometry on the Hydraulic Performance of a Waste Stabilization Pond
Authors: Faissal R. Ouedraogo [email protected], Jie Zhang [email protected], Pablo K. Cornejo [email protected], Qiong Zhang [email protected], James R. Mihelcic [email protected], and Andres E. Tejada-Martinez [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2016
Abstract
Improving the hydraulic performance of waste stabilization ponds (WSPs) is an important management strategy to not only ensure protection of public health and the environment, but also to maximize the potential reuse of valuable resources found in the treated effluent. To reuse effluent from WSPs, a better understanding of the factors that impact the hydraulic performance of the system is needed. One major factor determining the hydraulic performance of a WSP is sludge accumulation, which alters the volume of the pond. In this study, computational fluid dynamics (CFD) analysis was applied to investigate the impact of sludge layer geometry on hydraulic performance of a facultative pond, typically used in many small communities throughout the developing world. Four waste stabilization pond cases with different sludge volumes and distributions were investigated. Results indicate that sludge distribution and volume have a significant impact on wastewater treatment efficiency and capacity. Although treatment capacity is reduced with accumulation of sludge, the latter may induce a baffling effect which causes the flow to behave closer to that of plug flow reactor and thus increase treatment efficiency. In addition to sludge accumulation and distribution, the impact of water surface level is also investigated through two additional cases. Findings show that an increase in water level while keeping a constant flow rate can result in a significant decrease in the hydraulic performance by reducing the sludge baffling effect, suggesting a careful monitoring of sludge accumulation and water surface level in WSP systems.
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© 2016 American Society of Civil Engineers.
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Published online: May 18, 2016
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Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., ENG 311, Tampa, FL 33620. E-mail: [email protected]
Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620. E-mail: [email protected]
Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620. E-mail: [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620. E-mail: [email protected]
Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620. E-mail: [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, 4202 E. Fowler Ave., ENC 3207 Tampa, FL 33620. E-mail: [email protected]
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