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OXYGEN SAG EQUATION FOR THREE‐HALVES ORDER BOD REACTION 1
Author(s) -
Adrian Donald Dean,
Sanders Thomas G.,
Roider Emerald M.
Publication year - 1999
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1999.tb04206.x
Subject(s) - order (exchange) , biochemical oxygen demand , order of reaction , oxygen , first order , mathematics , constant (computer programming) , least squares function approximation , rate equation , reaction rate constant , chemistry , thermodynamics , statistics , environmental science , environmental engineering , physics , kinetics , computer science , chemical oxygen demand , classical mechanics , organic chemistry , finance , estimator , wastewater , economics , programming language
Several published BOD data sets are examined to show that approximately half of them are described best in the least squares sense by treating the BOD equation as being of the three‐halves order instead of first order. A dissolved oxygen (DO) sag equation for a stream is developed in which the BOD is described as a three‐halves order reaction. The time when the minimum DO concentration occurs is calculated numerically. The DO sag model applied to example problems shows that an increase in the BOD reaction rate constant results in a smaller minimum DO concentration and a decrease in the time to reach the minimum DO.