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Unformatted text preview: 4. The organic concentration in a water sample, measured as BOD L is 4 mg/L. If the BOD reaction rate is 0.3/day, what will be the concentration of organic matter remaining at the end of 5 days (L t )? How much oxygen will be used in this period to oxidize the waste (y t )? 5. A water sample has a BOD 5 of 10 mg/L. The sample was diluted 1/10 with dilution water and put in a BOD bottle. Initial DO (dissolved oxygen) in the BOD bottle was 8 mg/L. The sample also contained 2 mg/L NH 3-N (before dilution). Assume the sample was typical domestic sewage. What was the final DO in the BOD bottle? 6. A BOD test is performed on an undiluted sample at 20 o C and 35 o C. BOD 5 at 20 o C was 4.15 mg/L. BOD 5 at 35 o C was 6.56 mg/L. From this data determine the BOD L of the sample. Assume that nitrification was inhibited and that the temperature correction factor ( 29 equals 1.05. 7. Do Stella Exercise #2 1 2...
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- Spring '10