Reliability analysis of stabilisation on pond systems

This article presents a reliability analysis of 116 full-scale pond systems in Brazil, comprising 73 primary facultative ponds and 43 anaerobic -facultative pond systems. A methodology developed by Niku et al. (1979) is used for the determination of the coefficients of reliability, in terms of the c...

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Bibliographic Details
Published inWater science and technology Vol. 55; no. 11; pp. 127 - 134
Main Authors Oliveira, S.M.A.C, Sperling, M. von
Format Journal Article
LanguageEnglish
Published England IWA Publishing 01.01.2007
Subjects
Bioreactors
Brazil
Coefficient of variation
Coefficients
Compliance
Design standards
Discharge
Effluent standards
Effluents
Evaluation Studies as Topic
Mathematical analysis
methodology
Oxygen - analysis
Ponds
Reliability
Reliability analysis
Stabilization ponds
systems analysis
Variability
Waste Disposal, Fluid - methods
waste lagoons
Wastewater treatment
Water Pollutants, Chemical - analysis
Water Purification - methods
water quality
Brazil
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Summary:This article presents a reliability analysis of 116 full-scale pond systems in Brazil, comprising 73 primary facultative ponds and 43 anaerobic -facultative pond systems. A methodology developed by Niku et al. (1979) is used for the determination of the coefficients of reliability, in terms of the compliance of effluent BOD, COD, TSS and FC to discharge standards or effluent quality targets. The design concentrations necessary to meet the prevailing discharge standards and the expected compliance percentages have been calculated from the coefficients of reliability obtained. The results showed that few units, under the observed operating conditions, would be able to present reliable performances in terms of compliance with the analyzed standards. For the four constituents (BOD, COD, TSS and FC) and both systems (facultative ponds and anaerobic-facultative systems), the variability of the effluent quality was very large, leading to a high variability of the coefficient of variation (CV) and the coefficient of reliability (COR). The effluent quality from the facultative ponds showed a larger distance to both the desired values and the discharge standard values, compared with the anaerobic-facultative systems.
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ISBN:1843395967
9781843395966
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2007.343