Nitrification kinetics is important for process design, optimization, and capacity rating of activated sludge wastewater treatment plants. A WERF project on Methods for Wastewater Characterization in Activated Sludge Modeling (Melcer et al., 2002) focused significantly on the
development of procedures for measuring the nitrifier maximum specific growth rate, μAUT. In addition, the importance of (and lack of data for) the nitrifier decay rate, bAUT, was identified. This paper describes three bench-scale methods for measuring μAUT:
the Low F/M SBR, Washout and High F/M methods. The impact of an incorrect decay rate on the μAUT estimates from the different test regimes is illustrated. An ongoing study is investigating important experimental issues of pH control, temperature control and decay rate
determination. This paper provides a status report. A summary of μAUT measurements in a number of locations and using the different measurement techniques is provided.
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