The ultimate BOD of a domestic wastewater is 225 mg/L and the e based rate constant is k=0.34 d-1 .

a. What will be the 5-day BOD (Sample-1)?

b. What will be the 7-day BOD (Sample-1)?

c. A different wastewater sample (i.e., Sample-2) has the same ultimate BOD given in the question, but the e-based rate constant is equal to 0.16 d-1 . Determine the 5-day BOD of this sample.

d. Please comment on the biodegradability of Samples 1 and 2 by comparing their k and BOD5 values. Which one is more easily biodegradable? Why?