Problem $8$: Data from a complete$-$mix activated$-$sludge system is given below:

Average design flow $=7MGD$

Raw wastewater TSS $=300m\frac{g}{L}$

Effluent TSS $=24m\frac{g}{L}$

The raw wastewater is treated in the primary clarifier. TSS removal in the primary clarifiers is $60$

percent. If the specific gravity of the primary sludge is $1\mathrm{.}05$ and the sludge has $4\mathrm{.}4\%$ of solids

content. The average primary sludge flow rate $($gpd$)$ is most nearly:

$($A$)24300$

$($B$)25800$

$($C$)27300$

$($D$)29600$