Question $1$

Determine $1-$day BOD and ultimate first stage BOD for a w$/$w whose $5-$ day

BOD is $200m\frac{g}{L}$ at $20C.$ The reaction constant $k($base e$)=0\mathrm{.}23d-1.$ What

would have been the $5-$day BOD if the test have been conducted at $25C?$

Analyse:

Given : $k_1($to the base e$)=\frac{0\mathrm{.}23}{d}$

Calculate:

$BO{D}_5=200m\frac{g}{L}at20C$

$L_0$

$BO{D}_1$ at $20C$

$BO{D}_5$ at $25C$