esign equations

xample: Design a trickling filter for a plant receiving

$2400\frac{m^3}{?}$ day of wastewater with a BOD concentration

of $300mg\frac{O_2}{1}.$

There is a PST which will remove at least $25\%$ BOD.

Therefore Influent BOD to fif $={0\mathrm{.}75}^{**}300=225mg$

Know required effluent standard $=50m\frac{g}{\frac{?}{?}}$

Compute required removal efficiency $=(225-\frac{50}{225})=78\%$

Find OSLR: $78=93-1\mathrm{.}1$ SSLR $($OSLR $=13\mathrm{.}64k\frac{g}{m^2}.d$

Use eqn for OSLR to compute required area

Depth is adopted from standards $($usually $1\mathrm{.}8$ m $)$ Range

wideg cepending on m$$ans of ventilation