Abstract
The Streeter-Phelps' formula was revised by introducing new reaction constants (Kd; for deoxygenation and Kr; for reaeration), on the basis of the results of our experimental analysis on the oxygen balance in a stream with an apparatus (Fig. 1), especially designed for this purpose. Then, after investigating the relationships between Kd or Kr and its controlling factors, it was revealed that Kd and Kr were affected by the loaded amount of putrescible matter into the stream, of which the effect was used to be neglected in the past analysis, and that the conventional formula was apt to give underestimated values of the dissolved oxygen deficit for short streams where a large amount of pollutant was loaded.
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