Design of Sludge Digestion Tanks

by Richard D. Pomeroy,

Serial Information: Journal of the Sanitary Engineering Division, 1968, Vol. 94, Issue 5, Pg. 769-778

Document Type: Journal Paper


Recent innovations and improvements in the design of sludge digestion tanks, not yet widely known among engineers, are considered. These include: (1) Essentially flat bottoms with multiple sludge withdrawal pipes; (2) open-ended pipes laid on the floor for the injection of compressed gas, needed for efficient mixing; (3) openings of ample size in the wall at floor level to facilitate emptying and access; (4) sampling pipes from different elevations, of ample diameter, and with discharges designed to avoid splashing; (5) a membrane cover (tried on one digester); (6) Gas piping from a single digester, large enough to carry gas displaced by pumping sludge into the tank plus about eight times the estimated average gas production; and (7) in a trickling filter plant, gas from the digester may be disposed of by blowing it through the filter.

Subject Headings: Natural gas | Sludge | Gas pipelines | Pipe sizes | Wastewater treatment | Floors | Filters | Building design

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