A wastewater having BOD of $300m\frac{g}{l}$ is treated in a CSTR with recycle with

coefficients ;

${}_{\text{m}\text{a}\text{x}}=3da{y}^{-1}Ks=100m\frac{g}{l}$ BOD $Y=0\mathrm{.}6gVS\frac{S}{g}BOD{k}_d=0\mathrm{.}05da{y}^{-1}$

$f$:$0\mathrm{.}7$

a$)$ If sludge age $6$ days, find effluent BOD

b$)$ Calculate observed yield $($Yn$)$

c$)$ How much sludge can be sustained in the reactor per removed unit wastewater

flow?

d$)$ How much sludge is produced daily per unit of wastewater flow?

e$)$ How much oxygen is utilized per unit of wastewater treated?A wastewater having BOD of $300m\frac{g}{l}$ is treated in a CSTR with recycle with

coefficients ;