Q$5.$ An $A^{2}O$ process with a $12d$ SRT and achieves the following effluent nutrient concentration

with internal and return activated sludge recycle ratios of $3$ and $0\mathrm{.}5$ respectively.

Effluent soluble $P$ concentration $=0\mathrm{.}5m\frac{g}{L}$

Effluent $N{O}_3^{-}-N$ concentration $=5m\frac{g}{L}$

Assuming that influent ww characteristics and SRT remain same, determine $($a$)$ the change in

effluent soluble $P$ and $N{O}_3^{-}-N$ concentrations if the internal recycle ratio is changed $2$ and RAS

ratio is increased to $1\mathrm{.}0.($b$)$ How much additional influent rbCOD is consumed by nitrate fed

to anaerobic zone.