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

Author

Andrew Thomas Woodcock, University of Central Florida

Abstract

Cell growth rate for nitrification systems has been defined by a double factor Monod model using ammonia-nitrogen and dissolved oxygen concentrations.

U = U_max * N [over] K_N + N * DO [over] C + K_DO + 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 = U_max * 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 K_N over a range of dissolved oxygen concentrations and K_DO over a range of ammonia-nitrogen concentrations. It was found that K_N does not significantly depend upon dissolved oxygen but K_DO 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

PDF

Pages

87 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0027226

Subjects

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

STARS Citation

Woodcock, Andrew Thomas, "Determination of the Independence of Monod Half-saturation Constants in Nitrification Systems" (1989). Retrospective Theses and Dissertations. 4250.
https://stars.library.ucf.edu/rtd/4250

Accessibility Status

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