Nitrification Rates in Activated Sludge

by Joseph H. Sherrard, (M.ASCE), Prof. of Civ. Engrg.; Virginia Polytechnic Inst. and State Univ., Blacksburg, Va. 24061,
Deborah K. Manning, (A.M.ASCE), Engr.; James M. Montgomery Engrs., Inc., Reston, Va. 22091,
Debra A. Smith, (A.M.ASCE), Asst. Engr.; Boyle Engrg. Co., Falls Church, Va. 22043,

Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 5, Pg. 1074-1078

Document Type: Journal Paper


By using biokinetic and stoichiometric equations it was possible to theoretically develop insight into factors that affect nitrification rate in activated sludge systems. From this study it was shown that nitrifier fraction is not a constant and is dependent on mean cell residence time and the influent COD:TKN ratio, and the percentage of nitrifiers present in an activated sludge biomass does not have an effect on the rate of nitrification.

Subject Headings: Activated sludge | Kinetics | Residence time | Influents | Biomass

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