Problem $37$: A water analysis as $\{$:$CaC{O}_3)$ is shown below in the bar chart. It is desired to

remove only the carbonate hardness due to Calcium. Excess lime beyond the stoichemetric

amount will be added at a dose of $20m\frac{g}{L}$ as $CaC{O}_3.$ The flow rate in the water treatment plant

is $2\mathrm{.}5MGD.$ If the quick lime is $90\%$ pure, the amount of quick lime $($Ib$/$day$)$ required is most

nearly:

$($A$)1500$

$($B$)2500$

$($C$)3200$

$($D$)3700$