CFD analysis of sludge accumulation and hydraulic performance of a waste stabilization pond

Author:

Alvarado Andres12,Sanchez Esteban1,Durazno Galo3,Vesvikar Mehul2,Nopens Ingmar2

Affiliation:

1. DIUC, Universidad de Cuenca Av. 12 de Abril s/n Cuenca, Ecuador

2. BIOMATH, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure links 653, B-9000 Gent, Belgium

3. ETAPA, Empresa Pública Municipal de Telecomunicaciones, Agua Potable, Alcantarillado y Saneamiento de Cuenca, Ecuador

Abstract

Sludge management in waste stabilization ponds (WSPs) is essential for safeguarding the system performance. Sludge accumulation patterns in WSPs are strongly influenced by the pond hydrodynamics. CFD modeling was applied to study the relation between velocity profiles and sludge deposition during 10 years of operation of the Ucubamba WSP in Cuenca (Ecuador). One tracer experiment was performed and three sludge accumulation scenarios based on bathymetric surveys were simulated. A residence time distribution (RTD) analysis illustrated the decrease of residence times due to sludge deposition. Sludge accumulation rates were calculated. The influence of flow pattern on the sludge deposition was studied, enabling better planning of future pond operation and desludging.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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