Determine the 5-day BOD and k-rate for a raw domestic wastcwater based cm the following test data. Draw the BOD-time curve and graph for determination of the Crate, The 300-ml test bottles were filled with 2.00 percent wastewater mixed with dilution water. The initial dissolved oxygen (DO) in all bottles was 8.3 mg/l based on three bottles titrated after preparation. The time-residual DO data for the incubated bottles were as follows: t = 1.1 days, DO =: 6.7 mg/1; 2.2 days, 6.0 mg/l; 4.3 days,4.7 mg/l; 6.3 days, 3.8 mg/l; and 14.4 days, 2.4 mg/l.
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