Calculate the yield coefficient $(mgVS\frac{S}{m}gBO{D}_5)$ when the suspended solids concentration to be

reached, under steady$-$state conditions is $180m\frac{g}{L}.$ Other relevant data are:

Influent substrate $($total $BO{D}_5)S_0=500m\frac{g}{L}$

Effluent substrate $($soluble $BO{D}_5)S=20m\frac{g}{L}$

Hydraulic detention time $t=4\mathrm{.}0$ days

Endogenous coefficient: $K_d=0\mathrm{.}05d^{-1}$

$0\mathrm{.}45$

$0\mathrm{.}60$

$0\mathrm{.}83$

$0\mathrm{.}28$