ENV$3001$

Homework $5$

$3.(25$ points$)$ Assuming the degradation of BOD follows first$-$order kinetics.

a$.(10$ points$)$ If given an initial BOD concentration $($ultimate BOD,BODu $)$ of $175m\frac{g}{L},$ what is the remaining BOD after five days. Assume a rate constant of $0\mathrm{.}2$ day ${?}^{-1}$

a$.(15$ points$)$ If $BO{D}_5=75m\frac{g}{L},$ assuming the same rate constant of $0\mathrm{.}2$ day ${?}^{-1},$ what is the initial BOD concentration $($BODu$)?$