D Question 15 1 pts In running a five-day BOD and a COD test, you found that the

Question

D Question 15 1 pts In running a five-day BOD and a COD test, you found that the BODs is 0.5 mg/L and the COD is 245 mg/L. Which of the following explains why this result is observed? O The organic material is biotoxic to microorganisms O The BOD bottles were left open, allowing oxygen to enter into the sample O Someone forgot to add seed O Someone forgot to add nutrients to the dilution water Someone forgot to add the sample to the BOD bottles O All of the above None of the above Question 16 1 pts F3 F4 F5 F6 F7 F8 F9 F10 F11

Explanation / Answer

16. Answer:- All of the above

Assumptions of Streeter Phelps DO sag model:-

(i) plug flow

(ii) Complete uniform mixing at any cross section

(iii) Continous discharge of waste

(iv) Rate of deoxygenation at any point in the river is proportional to the BOD remaining at that point

(v) Rate of reaeration is proportional to the oxygen deficit

(vi) Initials conditions are a result of two conservative mass balances on ultimate BOD and initial DO

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