A BOD analysis was performed on a municipal wastewater containing food-processing wastewater discharged to the sewer system. The purpose was to draw a BOD-time curve, determine the 5-day BOD, and make a graphical determination of the k-rate. The wastewater was mixed with dilution water for a 1.5 percent mixture, which is equal to 4.5 ml of wastewater in each 300-ml bottle. The initial DO was 8.1 mg/l based on titration of 3 bottles. The results from titrating the incubated bottles are as follows: 0.6 days, DO = 6,0 mg/l; 0.9 days, 5.6 mg/l; 1.7 days, 4.2 mg/l; days, 3.1 mg/l; 3.6 days, 2.3 mg/l; 3.9 days, 2.1 mg/l; and 5.0 days, 1.7 mg/l.
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