Effect of tapering on the performance of waste stabilization ponds

A model for wastewater degradation in a tapered waste stabilization pond was derived as a modified Bessel function by materials balance approach. Based on hypothetical data, the tapered model gave lower faecal bacteria removal than the conventional (rectangular) model for various values of dispersio...

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Bibliographic Details
Published in:Water research (Oxford) 2001-04, Vol.35 (5), p.1191-1200
Main Author: Agunwamba, J.C.
Format: Article
Language:English
Subjects:
Applied sciences
Bacteria - isolation & purification
bacteria reduction
Biological and medical sciences
Biological treatment of waters
Biotechnology
Environment and pollution
Equipment Design
Exact sciences and technology
Feces - microbiology
Fundamental and applied biological sciences. Psychology
General purification processes
Humans
Industrial applications and implications. Economical aspects
Models, Theoretical
Pollution
rectangular pond
shape effect
tapered waste stabilization ponds
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastewaters
Water Microbiology
Water Purification - instrumentation
Water Purification - methods
Water treatment and pollution
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Summary:A model for wastewater degradation in a tapered waste stabilization pond was derived as a modified Bessel function by materials balance approach. Based on hypothetical data, the tapered model gave lower faecal bacteria removal than the conventional (rectangular) model for various values of dispersion number, die-off rate coefficient, average width and shape factors. The above results were corroborated by data collected from two laboratory ponds operated in parallel; one having a tapered and the other a rectangular surface area. The latter gave slightly higher hydraulic efficiency and BOD 5 removal. Besides, faecal bacteria removal was significantly lower in the tapered pond than in the rectangular pond at 0.10 level of significance. Calculated faecal bacteria reduction using the tapered model was in good agreement with measured data with coefficient of correlation and standard error of 0.904 and 0.014, respectively. Effects of tapering on ponds with respect to construction cost, operational and maintenance ease and accuracy of estimated design parameters are also discussed.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(00)00391-2