$4.$ Laboratory test reactors have been operated at different SRT values at steady state to obtain biological kinetic coefficients for wastewater with soluble COD only. The reactors are complete$-$ mix and aerated with clarifiers and solids recycle. The HRT value in all cases is $0\mathrm{.}167$ d and the

SRT values were varied for the five tests. The influent and effluent soluble COD and reactor MLVSS concentrations are summarized as follows:

Test No$.$ SRT$,$ d S$0,$ mg COD$/$L S$,$ mg COD$/$L X$,$ mg VSS$/$L

$13\mathrm{.}1400103950$

$22\mathrm{.}140014\mathrm{.}32865$

$31\mathrm{.}640021\mathrm{.}02100$

$40\mathrm{.}840049\mathrm{.}51050$

$50\mathrm{.}6400101\mathrm{.}6660$

From these results determine the values for the kinetic coefficients, k$,$ KS$,,$ Y$,$ and b$.$

Note: plot $1$ VS $$ using Eq$.7-39,$ and $$

VS $1$ using Eq$.7-12.$

$$

$$