$8-26.$ Using the following assumptions, determine the solids retention time, the cell wastage

$\frac{?}{\text{b}\text{a}\text{r}}($ page $574)$

flow rate, and the return sludge flow rate for the Lotta Hart Hospital WWTP $($Problem $8-$

page $574$

$.$ Assume:

Allowable $BO{D}_5$ in effluent $=25\mathrm{.}0m\frac{g}{L}$

Suspended solids in effluent $=25\mathrm{.}0m\frac{g}{L}$

Wastage is from the return sludge line

Yield coefficient $=0\mathrm{.}60mg$ VSS $\frac{?}{mg}$ BOD ${?}_5$ removed

Decay rate of microorganisms $=0\mathrm{.}060d^{-1}$

Inert fraction of suspended solids $=66\mathrm{.}67\%$