$(10)$ For a given offluent$-$skeam combination, say values $b$ BOD reaction

vate and strean rearration vath are $0\mathrm{.}26$ and $0\mathrm{.}42d^{-},$ respectively and

given that mitial DO deficit is $2m\frac{g}{L}$ with eltimath BOD of the mixture

equal to $18m\frac{g}{L}.$ Calulah time $(t^{+})$nnce mixing of effluent with stheam

watre after which Do deficit becomes $(\%.$ & the initial Do defints