Effects of Shock Temperature on Biological Systems

by John L. Carter, (M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Michigan Technological Univ., Houghton, Mich.,
William F. Barry, Grad. Student; Dept. of Civ. Engrg., Iowa State Univ., Ames, Iowa,

Serial Information: Journal of the Environmental Engineering Division, 1975, Vol. 101, Issue 2, Pg. 229-243

Document Type: Journal Paper


The BOD, COD, and oxygen uptake data were used to evaluate equilibrium and shock temperature studies on 35°C and 50°C activated sludge systems. The BOD removals of 96% or greater were obtained for the control units. Similar oxygen uptake rates were found for both controls; however, more oxygen was required at 50°C and a slower rate of COD removal was observed. Decreased removal efficiencies occurred when shock temperatures passed through 45°C, the thermophilic-mesophilic crossover point. The commonly used assumption that rates of reaction double, or halve for every 10? temperature increase, or decrease was not valid.

Subject Headings: Oxygen | Temperature effects | Biological processes | Oxygen demand | Equilibrium | Activated sludge

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