SolutionsHW#5

SolutionsHW#5 - SOLUTIONS HOMEWORK NO. 5 CE 3400...

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SOLUTIONS HOMEWORK NO. 5 CE 3400 – Introduction of Environmental Engineering Material Covered: Ch 9 (Water Quality) in Vesilind et al., 2010 1. An analysis for BOD 5 needs to be run on a sample of wastewater. The BOD is expected to range from 50 to 350 mg/L, and the dilutions were prepared accordingly. In each case, a standard 300-mL BOD bottle is used. The data are listed below. Determine the BOD 5 and BOD u of this wastewater. Hint: Are there any results you should discard? If you were in class on Friday, 8 October, you know what this hint means. Otherwise, consult your textbook. Bottle # Wastewater (mL) DO i (mg/L) DO 5 (mg/L) 1 20 8.9 0.75 2 10 9.1 2.5 3 5 9.2 5.8 4 2 9.2 8.9 Step 1: Can any samples be discarded? Yes, Bottle 1 has a difference in DO concentration between initial and final of >7 mg/L so may be discarded. . Bottle 4 has a difference in DO concentration between initial and final of <2 mg/L so may also be discarded. Step 2:
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SolutionsHW#5 - SOLUTIONS HOMEWORK NO. 5 CE 3400...

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