Question $3$

A complete$-$mix activated sludge process treats $20M\frac{L}{?}$ day of wastewater containing $225$

$m\frac{g}{L}BO{D}_5$ to $20m\frac{g}{L}BO{D}_5.$ The volume of the aeration basin is $3000m^3$ and the MLSS

concentration is $2500m\frac{g}{L}.$ Determine the following:

a$)$ Detention time in the aeration basin

b$)$ F$/$M ratio

c$)$ Specific substrate utilisation rate

d$)$ Substrate removal efficiency