"The feasibility of utilizing the thermal energy from an electric power plant to operate an activated sludge process at elevated temperatures (above 40°C) was assessed.
The practicality of using this heat was determined from a heat transfer analysis and the operation of the activated sludge process was evaluated from laboratory studies of a batch process treating domestic and synthetic sewage.
The tank size for a thermophilic activated sludge chamber could be reduced by 40 to 50% as compared to ambient temperatures. For thermophilic processes a temperature of 55°C is recommended because the transition phase between mesophiles and thermophiles is around 45°C and maximum growth rate occurs at 55°C. The effluent suspended solids after an hour and a half of settling was about 25 mg/1.
Only about 10% of the thermal energy in the power plant cooling water is utilizable for increasing sewage temperatures to the thermophilic range. The additional boiler steam output required would be 7 to 33% for sewage flow rates of 20 to 100 MGD.
The basic proposal described above was found to be technically feasible but the economic analysis was considered to be beyond the scope of this research. It was felt that such a proposal has application but additional research is needed"--Abstract, page ii.
Wixson, Bobby G.
Modesitt, Donald E.
Howell, Ronald H. (Ronald Hunter), 1935-
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
United States. Federal Water Pollution Control Administration
University of Missouri--Rolla
ix, 119 pages
© 1973 Peter J. Dawson, All rights reserved.
Thesis - Restricted Access
Sewage -- Purification -- Activated sludge process
Sewage sludge -- Effect of high temperatures on
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b1066727~S5
Dawson, Peter J., "The evaluation of an activated sludge process at elevated temperatures" (1973). Masters Theses. 3515.
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