The Reliability of Treatment Systemsby Paul J. Ossenbruggen, Univ of New Hampshire, Durham, NH, USA,
Kenneth Constantine, Univ of New Hampshire, Durham, NH, USA,
Abstract: The purpose of this paper is to present the results of case studies of zero and first order reactor systems and an activated sludge treatment system consisting of a primary settling tank and a continuous flow stirred aeration tank reactor with recycle of cells from a secondary settling tank. The primary purpose is to demonstrate the use of probability based methods formulation for estimating process reliability for different treatment processes. Mass balance relationships were written to determine the interaction among variables. Unlike traditional design, random variables were introduced into the mass balance relationship and then substituted into the reliability function. The new function consists of a set of random variables associated with the variabilities-in-demand and treatment process noise and a set of control variables.
Subject Headings: System reliability | Wastewater treatment | Case studies | Sedimentation tanks | System analysis | Activated sludge | Aeration | Recycling
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