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4. The following data is obtained from a BOD test of a wastewater sample. The BOD value at 20C after 1 day is 125mg/L and

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4. The following data is obtained from a BOD test of a wastewater sample. The BOD value at 20C after 1 day is 125mg/L and after 9 days is 225mg/L. Calculate the BOD5 (in mg/L ) using the first-order rate model. (15 points)

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