Effect of Pond Depth on Bacterial Mortality Rate
Publication: Journal of Environmental Engineering
Volume 115, Issue 5
Abstract
The bactericidal action of solar radiation was investigated in pilot scale waste stabilization ponds under the tropical climate of Dar es Salaam, Tanzania. Bacterial reduction was observed to proceed with increasing direct solar intensity and hydraulic detention time. The mortality rate of faecal coliforms used as test micro‐organisms was higher in samples incubated near the surface and decreased rapidly when the samples were incubated at greater depths in the pond. The disappearance rate of faecal coliforms for samples incubated at the pond surface and at a depth of 1.0 m was and respectively. Faecal coliforms were also found to be reduced rapidly in shallow ponds. The mortality rate in 1.0 m and 1.5 m deep ponds was respectively 0.43 and The dieoff rate constant was observed to vary significantly with pond depth but was independent of hydraulic detention time.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 115 • Issue 5 • October 1989
Pages: 964 - 977
Copyright
Copyright © 1989 ASCE.
History
Published online: Oct 1, 1989
Published in print: Oct 1989
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