Probiem $37$: A water analysis $(m\frac{g}{L}$ 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 $20mgl$ 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 $($lb$/$day$)$ required is most nearly:

$\backslash$table$[[,,275],[\backslash$table$[[$Carbon$],[$dioxide$],[50]],\backslash$table$[[$Calcium$],[150]],\backslash$table$[[$Other cations$],[125]]],[\backslash$table$[[$Bicarbonate$],[120]],\backslash$table$[[$Other anions$],[155]]],[,,]]$

$($A$)1500$

$($B$)2500$

$($C$)3200$

$($D$)3700$