$11-24$ Using the following assumptions, determine the solids retention time, the cell wastage flow rate, and the return sludge flow rate for the Jambalaya shrimp processing plant WWTP $($Problem $11-21).$

Assume:

Allowable $BO{D}_s$ in effluent $=25\mathrm{.}0mg*L^{-1}$

Suspended solids in effluent $=30\mathrm{.}0mg*L^{-1}$

Wastage is from the return sludge line

Yield coefficient $=0\mathrm{.}50mg$ VSS $*mgBO{D}_5$ removed

Decay rate of microorganisms $=0\mathrm{.}075d^{-1}$

Inert fraction of suspended solids $=30\mathrm{.}0\%$