Title

Determination of the Independence of Monod Half-saturation Constants in Nitrification Systems

Abstract

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.

Notes

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Graduation Date

1989

Semester

Fall

Advisor

Dietz, John D.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Civil Engineering and Environmental Sciences

Format

Print

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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