"Most domestic sewage treatment plants today practice anaerobic digestion of sludge. The purpose of this investigation was to determine if thorough mechanical mixing of concentrated sludge would improve its digestion. The simulated digesters consisted of six 1 gallon anaerobic reactors which were operated in the laboratory for 78 days. The contents of three digesters were continually mixed and their responses were compared with those of the similarly loaded remaining three unmixed units. Raw sludge with solids concentrations of 7.5, 15 and 30 per cent was digested for detention periods of 30, 15 and 7.5 days at 33º C. Various analyses were conducted periodically on the digester contents in addition to gas production and composition measurements. The gas production from the mixed digesters was found to be greater than from the unmixed digesters. The organic loading-detention time limits for anaerobic digestion were determined. The highest practical concentration of sludge for anaerobic digestion was found to be 15 per cent"--Abstract, page ii.
Clark, R. H. (Ralph H.)
Modesitt, Donald E.
Crane, Robert M.
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
United States. Environmental Protection Agency
University of Missouri--Rolla
vii, 58 pages
© 1971 Victor Darryl Orr, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Sewage sludge digestion
Sewage -- Purification -- Anaerobic treatment
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Orr, Victor Darryl, "A study of the effects of mixing on the accelerated anaerobic digestion of concentrated municipal sludges" (1971). Masters Theses. 5089.