Thesis (M.A.)--University of Wisconsin--Madison, 1970. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 85-89). Also available via the Internet.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Aerated stabilization basins (ASB), like many other biological treatment systems, demonstrate a temperature dependency. A decrease in treatment efficiency usually results from a decreasing basin temperature and has often been related to a decrease in the reaction rate coefficient, K. This relationship to the reaction rate may well apply for other treatment systems, but it has not been clearly demonstrated for aerated stabilization basins. This study develops data on steady-state performance at 3° C in order to present a coherent reference point for future ASB temperature studies and to define performance characteristics at 3°C. The following performance criteria were documented in the study: 1. Substrate removal in terms of filtered substrate removal. (61 - 80 per cent COD removal and 76 -98 per cent BOD₅ removal for retention times of 1 - 16 days). 2. System treatment efficiency defined in terms of gross effluent COD and BOD₅. (23 - 50 per cent COD removal and 18 - 80 per cent BOD₅ removal for retention times of 1 - 16 days). 3. Net biological solids production (0.25 lbs/lb BODu or COD used). 4. Oxygen utilization requirements (0.123 lbs O₂/ lb COD removed and 0.143 lbs O₂/BOD₅ removed for retention times of 2 - 16 days. Endogenous respiration - 0.75 mg/hr/ gm MLSS). 5. Nitrogen transformation. (A transformation of Kjeldahl nitrogen in the biological solids to NH₃ nitrogen in the filtrate was found apparently as a function of retention time). 6. Post Settling. (One day's aeration with one day settling was found to give equivalent treatment as eight days aeration and one day settling). Data was obtained at two loadings to provide information on the influence of influent concentration on overall performance. Established in the experiment was that any of the common mathematical models used to describe ASB operation, McKinney's, Eckenfelder's, or first-order exponential, could predict system treatment efficiency at 3°C for retention times beyond two to four days. It was further shown that only the Chemostat model would describe the substrate removal measured in the study. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

This research examines the use of microcomputer-based expert systems as a diagnostic tool and an operational aid of conventional secondary wastewater treatment facilities. The research has shown that rule-based systems are well suited for the domain of wastewater treatment facilities operations using observational information. Advances in expert systems software combined with increased microcomputer processing power have made this development work possible with personal computers. These systems possess the capability to provide fully automated diagnostics and process control as well as acting as a teaching and development tool for operators in full-scale treatment facilities. The thesis describes the technical aspects of wastewater treatment as applied to the development of a finished knowledge base system called WASTES (WAStewater Treatment Expert System). The thesis also discusses the development of the knowledge bases from their sources to implementation in the system. Recommendations and conclusions are also presented along with potential areas for further research. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1930. / There is no leaf number 94 in the thesis. The author mistakenly omitted it. The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed December 23, 2009) Includes bibliographical references (p. 158) and index (p. 159-169).

published_or_final_version / Public Administration / Master / Master of Public Administration

No description available.

Thesis (M.S.P.H.)--University of Michigan, 1943.