Hmwk#07 - Su13

# The following values of bod in mg l were measured on

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The following values of BOD, in mg / L, were measured on a daily at the effluent from a municipal treatment plant. Prepare a probability plot of the data. Estimate: (a) the average value of BOD, and (b) the worst quality that is expected to be observed once per month (30 days), i.e. , the value of BOD corresponding to a probability of 3.33%. Day : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 BOD : 56 63 57 33 21 17 25 49 21 35 65 65 31 21 Day : 15 16 17 18 19 20 21 BOD : 21 28 41 36 22 27 24

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Problem 6 - G. [ original ] Fig.11-12 is a flow sheet for a typical domestic wastewater treatment plant with discharge into a river. There are six process vessels shown: rack, grit chamber, primary settling tank, aeration tank, secondary settling tank, and disinfection. (a) What “contaminants” are removed in each vessel? (b) What additional contaminant(s) would have to be removed if discharge is to a small lake? What additional process(es) would be required? (c) What additional contaminant(s) would have to be removed if discharge is to an underground aquifer? What additional process(es) would be required? Problem 6 - B. [ original ] Odors from the “primary” and “secondary” treatment processes in a wastewater treatment plant are often detected off the plant site. They represent an obvious “aesthetic” problem, but should they be regulated as an air pollutant? Why or why not?
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