8. (20 pts) If DO after 5 days would be O.1 mg/L, what it means? Can we use thes

Question

8. (20 pts) If DO after 5 days would be O.1 mg/L, what it means? Can we use these results for engineering design? Justify your answer (40 pts) Your team has to train students (who are part of the research summer program) how to prepare BOD, samples for analysis, and you need to provide them with really clear explanation why is so important to follow exactly all provided procedures. (a) After running by yourself quick analysis (to make sure that everything will work as supposed to) you have learned that 9.

Explanation / Answer

Prob. 8

If the DO after 5 days would be 0.1 mg/L, this means that the oxygen demand of the microbes is reduced, in other words the impurities have been reduced. For the engineering design, BOD5 has to be found. BOD5 is found using a specific procedure, and specific conditions.

As for the given sample, neither the sample details, temperature details, not the initial DO is given, the value as such can not be used for the engineering design. One must known all the details.

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