Activated Sludge Process Modification Study

by Hraj A. Khararjian, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Memphis State Univ., Memphis, Tenn.,
Joseph H. Sherrard, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.,

Serial Information: Journal of the Environmental Engineering Division, 1979, Vol. 105, Issue 2, Pg. 189-198

Document Type: Journal Paper


A laboratory study was conducted with a colloidal wastewater that was fed to model completely mixed and contact stabilization units. The units were operated at steady-state conditions at several mean cell residence time values. Using mean cell residence time as a basis for comparison it was determined that the cell yield coefficient and microorganism decay coefficient were similar for the two systems and that waste treatment efficiency was also similar. From these results it was determined there is no difference in the kinetics or operational performance between these two modifications to the activated sludge process.

Subject Headings: Activated sludge | Laboratory tests | Residence time | Waste treatment | Colloids | Wastewater management | Steady states | Comparative studies

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