(Solved): b) The ultimate BOD of two sources of wastewater having k-values of \( 0.0900 \mathrm{~d}^{-1} \) ...

b) The ultimate BOD of two sources of wastewater having k-values of \( 0.0900 \mathrm{~d}^{-1} \) and \( 0.140 \mathrm{~d}^{-1} \) is \( 270.0 \mathrm{mg} / \mathrm{L} \), calculate the 5-days BOD for each and compare the difference between ultimate \( \mathrm{BOD} \) and \( \mathrm{BOD}_{5 .}(\mathrm{CO} 2: \mathrm{PO} 2)(\mathrm{C} 4) \) (7 marks)