Aerobic Digestion of Waste Activated Sludge

by C. Scott Reece, Environmental Engr.; E. Roberts Alley & Assoc., Brentwood, Tenn.,
C. P. Leslie Grady, Jr., Assoc. Prof. of Environmental Engrg.; School of Civ. Engrg., Purdue Univ., W. Lafayette, Ind.,
Ralph E. Roper, Jr., Environmental Engr.; H.B. Steeg & Assoc. Div., HNTB, Indianapolis, Ind.,

Serial Information: Journal of the Environmental Engineering Division, 1979, Vol. 105, Issue 2, Pg. 261-272

Document Type: Journal Paper


Activated sludge that had been grown on a completely soluble wastewater in a pilot plant was subjected to aerobic digestion in batch, lab-scale reactors. During the course of digestion, destruction of nonvolatile solids occured so that is was preferable to express the kinetics of digestion upon the loss of total suspended solids rather than volatile suspended solids. The first-order rate constant for the destruction of degradable suspended solids was found to be unaffected by the solids retention time (SRT) at which the activated sludge had been grown, whereas the nondegradable fraction of the activated sludge was found to increase as the SRT increased.

Subject Headings: Waste treatment | Turbidity | Activated sludge | Solubility | Wastewater management | Wastewater treatment plants | Laboratory tests | Aerobic processes

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