DO Sag Curve Streeter-Phelps
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DO Sag Curve Streeter-Phelps

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DO Sag Curve Streeter-Phelps

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1. 1 DO Sag Curve (Streeter-Phelps) April 17, 2006

2. 2

3. 3 Biota vs. D.O.

4. 4

5. 5 What we?re trying to accomplish and how we?re going to do it Calculate the dissolved oxygen deficit using mass balance equation Start with simplified model and calculation BOD Reaeration Initial DO reduction Add some more components to the model Get an equation for D (dissolved oxygen deficit) Get an equation for tc, the ?critical time? when the dissolved oxygen is at its lowest point

6. 6 Very Simplified Model

7. 7 Mass-Balance for Initial Condition

8. 8 Account for other DO gain/loss processes

9. 9 Why We Do All of This To determine how much waste can safely be put in a river Process Determine minimum acceptable DO Calculate waste load that keeps critical DO above the minimum If discharged waste is above acceptable limits: More treatment needed Discharger may add dissolved oxygen to wastewater Cautions Be sure to make calculations for worst conditions Remember to consider all dischargers


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