Risk Evaluation in Sewage Treatment Plant Design

by Daniel P. Loucks,

Serial Information: Journal of the Sanitary Engineering Division, 1967, Vol. 93, Issue 1, Pg. 25-40

Document Type: Journal Paper


A mathematical model is developed to predict, for any particular consecutive-day period, the probability of having less than any specified dissolved oxygen concentration downstream from a waste water treatment plant. Through the use of the model, the risk of stream standard or effluent standard violation resulting from the release of waste water effluent can be explicitly determined. Effluent storage is considered a means of taking advantage of the daily variation of stream and waste-water flows. Under certain conditions effluent storage may result in reduced probabilities of standard violation as well as reduced costs of waste water treatment.

Subject Headings: Effluents | Wastewater treatment plants | Water treatment plants | Risk management | Sewage | Mathematical models | Probability | Dissolved oxygen

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