$8-3.$ When the soluble BOD in the influent to the treatment plant rises from $133m\frac{g}{L}$ to $222m\frac{g}{L},$ the operator called to ask your advice on a new MLVSS for the plant. It has been operating with an $\frac{F}{M}$ of $0\mathrm{.}31m\frac{g}{m}g*d$ and the operator would like to continue using the same $\frac{F}{M}.$ The plant data are as follows: flow rate $=7,630m\frac{g}{L}$; aeration tank volume $=1,270m3$; mixed liquor volatile suspended solids $=2,600m\frac{g}{L}.$

e$)2,600m\frac{g}{L}$

f$)4,300m\frac{g}{L}$

g$)2,400m\frac{g}{L}$

h$)5,800m\frac{g}{L}$