10.2190/8712-651M-0783-6M26 8712651M07836M26 5 Dilutions of Glucose and Glutamic Acid Analyzed as Multi-Order BOD Reactions 81 103 20070614 20070614 20070614 20070614 8712651M07836M26.pdf http://baywood.metapress.com/link.asp?target=contribution&id=8712651M07836M26 1 Trieu Van Le Donald Dean Adrian Louisiana State University, Baton Rouge The Biochemical Oxygen Demand (BOD) of a mixture of glucose and glutamic acid is a standard test solution which provides a reasonably repeatable value of the 5-day BOD. The objective of this study was to evaluate the reaction order from respirometer data of BOD of glucose and glutamic acid mixtures. The mixtures ranged in increments of 10% from 10% strength (90% dilution) to 100% strength (no dilution). There were 10 replications of each strength of sample, so that the BOD of 100 samples measured at daily intervals for 5 days were available. The data were tested for goodness-of-fit to three BOD reaction models: a first-order model, a half-order model, and an order-n model. The root mean squared error measured the goodness-of-fit. Twenty-six percent of the samples fit the first-order model best, 63% fit the half-order model best, and 11% fit the order-n model best. R. R. Reining, <i>An Investigation of the Possible Effects of Dilution on the BOD Reaction Rate Constant</i>, M.S. thesis presented to the Graduate School, University of Massachusetts, Amherst, Massachusetts, 1967. American Public Health Association, American Water Works Association, and Water Pollution Control Federation, <i>Standard Methods for the Examination of Water and Wastewater</i> (12th ed.), 1965. A. Q. Y. Tom, <i>Investigation on Improving the BOD Test</i>, Sc.D. thesis, Massachusetts Institute of Technology, Cambridge, Massachusetts, 1951. V. Tangpanichdee, <i>Computerized Methodology for Determining BOD Kinetic Reaction Rate</i>, M.S. project presented to Civil Engineering Department, University of Massachusetts, Amherst, Massachusetts, 1977. D. D. Adrian and T. G. Sanders, Oxygen Sag Equation for Half Order BOD Kinetics, <i>Journal of Environmental Systems</i>, <b>22</b>:1, pp. 341-351, 1992-1993. F. M. Berthouex and L. C. Brown, <i>Statistics for Environmental Engineers</i> (2nd ed.), Lewis Publishers, Boca Raton, Florida, 2002. J. Hewitt, J. V. Hunter, and D. Lockwood, A Multiorder Approach to BOD Kinetics, <i>Water Research</i>, <b>13</b>, pp. 325-329, 1979. D. M. Marske and L. B. Polkowski, Evaluation of Methods for Estimating Biochemical Oxygen Demand Parameters, <i>Journal Water Pollution Control Federation</i>, <b>44</b>:10, pp. 1987-1999, 1972. M. E. Bates and D. G. Watts, <i>Nonlinear Regression Analysis and Application</i>, John Wiley and Sons, Inc., New York, 365 pp., 1988. M. E. Borsuk and C. A. Stow, Bayesian Parameter Estimation in a Mixed-Order Model of BOD Decay, <i>Water Research</i>, <b>34</b>:6, pp. 1830-1836, 2000. T. Le, E. M. Roider, and D. D. Adrian, Simplified Development of Oxygen Sag Model, <i>Journal of Environmental Systems</i>, <b>30</b>:2, pp. 134-145, 2003-2004.