EXAMPLE

For a design flow of $3\mathrm{.}8$ MGD$,$ effluent of chlorine based on activated sludge $(15m\frac{g}{L},$ determine both the lbs per day of sulfur dioxide and chlorine.

In addition, Davis and Cornwell state that chlorine is injected into the wastewater and is held in a basin for approximately $15$ minutes. What is the volume and diameter of a chlorine contact tank?

Assume $1$:$1$ for $C{l}_2$ and $S{O}_2.$

Use two tanks

Depth of each tank is $10$ feet.

$7\mathrm{.}48$gal$=1f{t}^3$