Q$4.$ Design a post anoxic denitrification system to achieve effluent $N{O}_3^{-}-N$ concertation of

$2m\frac{g}{L},$ using the given data and assumption. Denitrification kinetics data at $15C$ temperature,

$Y=0\mathrm{.}18gVS\frac{S}{g}$ bCOD used, $k_d=0\mathrm{.}05$perd,$K=6\mathrm{.}7g$ bCOD $\frac{?}{g}$ VSS$.$d$,K_s=10\mathrm{.}9m\frac{g}{L}.$ Feed

TSS is not significantly degraded $($and the BOD from nitrification reactor is negligible$).$

Methanol exiting the anoxic zone is degraded in aerobic zone $($which is provided following

denitrification for $15$ minutes to facilitate settling$).$ SRT of $5$ days, clarifier overflow rate $24$

$\frac{m}{d}.$

$($a$)$ determine the required methanol dose

$($b$)$ anoxic tank volume

$($c$)$ sludge production and area of clarifier

Wastewater characteristics