A BOD test is run with 150 mL of wastewater mixed with 150 mL of deionized water

Question

A BOD test is run with 150 mL of wastewater mixed with 150 mL of deionized water. The initial DO = 8.5 mg/L, the DO after 5 days = 4.2 mg/L, and the DO ultimately levels off at 1.7 mg/L. Assume all nitrification has been inhibited and the temperature remains constant.

a) Calculate the CBOD5 (y5, mg/L)

b) Calculate the ultimate CBOD (Lo, mg/L)

c) Calculate the CBOD remaining after 5 days (L5, mg/L)

d) Calculate the deoxygenation rate constant (kL, day^-1)

PS: I think this is a Determonation of Sturation DO Concentration question. I am not sure 100%

Explanation / Answer

CBOD = 8.5-4.2 = 4.3mg/L (because all nitrification has been inhibited and temperature is also constant).

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