The oxygen sag curve caused by a food processing plant reaches a minimum DO equal to 3.0 mg/L. Upstream from the plant, the river DO is saturated at 10.0 mg/L, and it has no BOD of its own. Just downstream from the discharge point, the DO is still essentially saturated (i. e., consider the initial oxygen deficit to be zero so the downstream deficit is proportional to initial BOD). By what percentage should the BOD of the plant waste be reduced to assure a healthy stream with at least 5.0 mg/L DO everywhere?
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The oxygen sag curve caused by a food processing plant reaches a minimum DO equal to 3.0 mg/L. Upstr...
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