||Mechanical Reliability and Plant Performance.
Rossman, Lewis A. ;
||Municipal Environmental Research Lab., Cincinnati, OH. Wastewater Research Div.
Sewage treatment ;
Mathematical models ;
Performance evaluation ;
Activated sludge process ;
Biochemical oxygen demand ;
Statistical analysis ;
Cost effectiveness ;
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A two state statistical model is proposed for studying the effect of equipment outages on plant performance. Simulation of lost treatment capacity in an activated sludge treatment system indicates the degree to which BOD violation frequencies are much more sensitive to lost aeration capacity than to lost clarifier or return sludge pumping capacity. A framework for utilizing the model to select cost-effective levels of design redundancy is presented. A simplified version of the procedure is applied to the design of an aeration system.