The Effect of Baffle Installation on the Performance of a Single-Cell Stabilization Pond

The effect of baffles on the performance of an ineffective, single-celled stabilization pond with theoretical retention time of 5-10 days, was investigated. The efficiency of the pond was evaluated by comparing the microbiological and chemical quality of pond's influent and effluent, as well as...

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Bibliographic Details
Published in:Water science and technology 1993-01, Vol.27 (7-8), p.45-52
Main Authors: Pedahzur, R, Nasser, A M, Dor, I, Fattal, B, Shuval, H I
Format: Article
Language:English
Subjects:
Baffles
Channeling
Density stratification
Efficiency
Effluents
Hydraulic tests
Hydraulics
Hypolimnion
Influents
Microorganisms
Ponds
Removal
Retention
Retention time
Sedimentation & deposition
Stabilization
Stabilization ponds
Stratification
Thermal stratification
Tracers
Wastewater
Water column
Water stratification
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Summary:The effect of baffles on the performance of an ineffective, single-celled stabilization pond with theoretical retention time of 5-10 days, was investigated. The efficiency of the pond was evaluated by comparing the microbiological and chemical quality of pond's influent and effluent, as well as by hydraulic tests. Removal of indicator microorganism (1 log) and BOD5 (55%) remained unchanged, regardless of the number of baffles. Tracer study findings were characterized by the appearance of a peak of tracer within 15-20 hours after injection of the tracer, followed by a long “tail” of lower concentration. These findings, along with optical observations, indicated that the baffles succeeded in channeling influent flow to the planned routes (resulting in increased traveling distance of the wastewater). However, the actual retention time of the influent, particularly a small but important fraction of it, remained short regardless of baffle installation. The lack of mixing caused by thermal stratification of the water column resulted in rapid bottom flow in the cool hypolimnion. These findings may explain, in part, the lack of success in improving treatment efficiency.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1993.0533