6. Some characteristic BOD lev els are given below Source BOD range (ppm) Untrea

Question

6. Some characteristic BOD lev els are given below Source BOD range (ppm) Untreated municipal sewage Runoff from barnyards and feed lots Food processing wastes 100-400 100-10,000 100-10.000 Assuming the minimum values above. by what factor must these waters be diluted with pure water to reduce the BOD to a value sufficiently low to support aquatic life (BODS S ppm)? 7. In determining the BOD of a water sample, it was found that the DO level was 9.3 ppm before incubation and 6.7 ppm after five days of incubation. What is the BOD of this sample? 8. Would the water sample in question 8 support aquatic life?

Explanation / Answer

F= dilution factor

C1= initial concentration

C2= final concentration

If the minimum value in the rage is 100 ppm and you need to dilute the samples to 5 ppm, the F will be,

F= 100 ppm/5 ppm = 20

The samples need to be diluted 20 times

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