TKN safety factor is $1\mathrm{.}5.($Nitrification safety factor is defined as Peak $/$ Average TKN

Loading ratio. Tchobanoglous et al$.,2004($p$.706))$

F$/$M ratio is given to be $0\mathrm{.}16\frac{g}{g}*d$

MLVSS $/$ MLSS $=0\mathrm{.}79$

$N_e=0\mathrm{.}5m\frac{g}{L}$

Activated sludge kinetic coefficients are given below for $15C.$

Determine;

a$)$ Flowrate and detention time of the system

b$)$ Biomass production

c$)$ Amount of nitrogen oxidized to nitrate

d$)$ Determine mass of MLSS and MLVSS in the aeration tank

e$)$ Oxygen Demand

f$)$ Alkalinity needed per day

g$)$ Effluent BOD

Assume: Residual alkalinity concentration needed to maintain $pH$ in the range of $6\mathrm{.}8$ to $7=70$

to $80m\frac{g}{L}$ as $CaC{O}_3$; select $75m\frac{g}{L}$ as $CaC{O}_3.$

Note: State any other assumption if required.You are expected to design a complete mix activated sludge process in order to treat incoming wastewater, which meets $BO{D}_e$ concentration less than $20m\frac{g}{L},N{H}_4-N_e$ concentration less than $10m\frac{g}{L}$ and $TS{S}_e$ concentration less than $15m\frac{g}{L}.$ The temperature of incoming wastewater is $15C.$ Nutrient characteristics of incoming wastewater are given in the following table.

Diffusers have an $O_2$ transfer efficiency of $40\%.$

Water depth in the aeration tank is $5m.$

Tank volume is $9000m^3.$

Diffusers are located $0\mathrm{.}4m$ from the tank bottom.

DO concentration in the aeration basin is $2\mathrm{.}0m\frac{g}{L}.$

Site elevation is $50m.($ ~$=1$atm$=101\mathrm{.}3$kPa $)$

Aeration $$ factor $=0\mathrm{.}5$ for BOD removal only, $0\mathrm{.}65$ for nitrification; $=0\mathrm{.}95$ for both

cases with diffuser fouling factor of $0\mathrm{.}9.$

and $3000m\frac{g}{L}$ are applicable$)$