ign a conventional Activated Sludge Plant for the following data :

a$)$ Population $=100000$

b$)$ Per capita sewage contribution $=150$ lpcd

c$)$ Inlet BOD $=220$ mg$/$l

d$)$ Effluent BOD $=20$ mg$/$l

e$)$ F$/$M ratio $=0\mathrm{.}2$ day$-1$

f$)$ MLSS $=3000$ mg$/$l

g$)$ SVI $=100$ ml$/$g

h$)$ Oxygen transfer rate of aerator $=1\mathrm{.}4$ kg$/$HP$/$hour

Find efficiency of the plant $,$ Volume of aeration tank $,$ Hydraulic retention time $,$ Volumetric

loading, Return sludge ratio $,$ Total horse power of aerators.