AN EVALUATION OF SOLUTIONS TO MOMENT METHOD OF BIOCHEMICAL  OXYGEN DEMAND KINETICS

IA Oke; S Lukman; JS Amoko; EO Fehintola

doi:10.4314/njt.371.1569

AN EVALUATION OF SOLUTIONS TO MOMENT METHOD OF BIOCHEMICAL OXYGEN DEMAND KINETICS

Authors

IA Oke DEPARTMENT OF CIVIL ENGINEERING, OBAFEMI AWOLOWO UNIVERSITY, ILE-IFE, OSUN STATE, NIGERIA
S Lukman DEPT. OF WATER RESOURCES & ENVIRONMENTAL ENGINEERING, AHMADU BELLO UNIV., ZARIA, KADUNA STATE. NIGERIA
JS Amoko DEPARTMENT OF CHEMISTRY, ADEYEMI FEDERAL UNIV. OF EDUCATION, ONDO, ONDO STATE. NIGERIA
EO Fehintola DEPARTMENT OF CHEMISTRY, ADEYEMI FEDERAL UNIV. OF EDUCATION, ONDO, ONDO STATE. NIGERIA

DOI:

https://doi.org/10.4314/njt.371.1569

Keywords:

Wastewater, Environmental Pollution Control, BOD Kinetic Parameters, Moment Method, Statistical Evaluation

Abstract

This paper evaluated selected solutions of moment method in respect to Biochemical Oxygen Demand (BOD) kinetics with the aim of ascertain error free solution. Domestic-institutional wastewaters were collected two-weekly for three months from waste-stabilization ponds in Obafemi Awolowo University, Ile-Ife. BOD concentrations (BOD_c) were determined daily for 8 days using standard method. The BOD_c were used to determine parameters in BOD kinetics (ultimate BOD concentration and BOD removal rate) using Microsoft Excel Solver, non-linear regression (exponential) and least squares methods (three graphs). Accuracies of these solutions were evaluated using relative error, Akaike Information Criterion (AIC), and model of selection criterion (MSC). The study revealed that ultimate BOD_c was in the range of 1368.7 to 860.6 mg/L and BOD_c removal rate was between -0.139 and -0.470 /d. The averages of MSC were 4.18; 0.01; 1.49, 1.28 and 1.61 for Microsoft Excel Solver, non-linear and three least square methods (graphs 1, 2 and 3) respectively. The result revealed that Microsoft Excel Solver provided an improved solution of moment method, and a good description of BOD_c removal trend based on MSC and AIC than the other solutions. The study concluded that Microsoft Excel Solver solution to the method is a valuable solution at higher confidence level based on lower values of AIC and high values of MSC.

http://dx.doi.org/10.4314/njt.v37i1.1

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Published

2017-12-31

Issue

Vol. 37 No. 1 (2018)

Section

Building, Civil & Geotechnical Engineering

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How to Cite

AN EVALUATION OF SOLUTIONS TO MOMENT METHOD OF BIOCHEMICAL OXYGEN DEMAND KINETICS. (2017). Nigerian Journal of Technology, 37(1), 1-12. https://doi.org/10.4314/njt.371.1569