EXAMPLE $3\mathrm{.}6$: A conventional activated sludge plant treats $100,000$ m$3/$d of

sewage with BOD of $200$ mg$/$L$.$ Assume that:

$$ MLSS concentration in aeration tank $($with $24,000$ m$3$ capacity$)$ is $1,800$ mg$/$L$,$

$$ the MLSS are $80\%$ volatile,

$$ BOD removal in the primary tank is $30\%,$ and

$$ the upper bound for organic loading $($F$/$M$)$ is $0\mathrm{.}3/$day$.$

Is the plant organically overloaded?