Determination of the Independence of Monod Half-saturation Constants in Nitrification Systems
Cell growth rate for nitrification systems has been defined by a double factor Monod model using ammonia-nitrogen and dissolved oxygen concentrations.
U = Umax * N [over] KN + N * DO [over] C + KDO + DO
This model assumes independence of the ammonia and DO factors. Research was conducted to establish this independence by comparison to a model where the half-saturation constant for each factor depended linearly upon the concentration of the complementary variable.
U = Umax * N [over] A + B*DO + N * DO [over] C + D*N + DO
A nitrifying mixed liquor was placed in batch reactors and aerated at a constant dissolved oxygen concentration. Substrate removal rate data was derived from the samples taken from the reactors. Nonlinear least squares parameter estimation was used to determine KN over a range of dissolved oxygen concentrations and KDO over a range of ammonia-nitrogen concentrations. It was found that KN does not significantly depend upon dissolved oxygen but KDO does depend upon the ammonia-nitrogen concentration. Subsequent analysis revealed, however, that this effect is minimal without significant affect on the design of nitrification systems. However, if this adjusted model is not used then bench scale tests should be conducted at expected operating DO and ammonia nitrogen concentrations in order to obtain more accurate half-saturations constants.
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Dietz, John D.
Master of Science (M.S.)
College of Engineering
Civil Engineering and Environmental Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Woodcock, Andrew Thomas, "Determination of the Independence of Monod Half-saturation Constants in Nitrification Systems" (1989). Retrospective Theses and Dissertations. 4250.