$Q=200\frac{m^3}{d}ax$

$BO{D}_5=300m\frac{g}{1}$

Total Coliform $=\frac{{10}^8}{100}ml$

$TN=40m\frac{g}{1}$

$TP=8m\frac{g}{1}$

With the stabilization pond in the figure, the domestic wastewater of a town with a flowrate of $200$

$\frac{m^3}{?}$ day is treated. In the region where the pond is located, the average air temperatures in the coldest

and hottest months are $10C$ and $25C,$ respectively. Wastewater temperature is $20C$ for a whole

year. Answer the following questions, assuming that there are always enough algae in the pond to

produce the necessary oxygen.

a$)$ Calculate the equivalent population.

b$)$ Calculate the $BO{D}_5$ and coliform microorganism concentrations in the summer and winter periods

of the plant. day ${?}^{-1},K_b(20C)=1\mathrm{.}2$ day ${?}^{-1},$ wastewater temperature in pond

$(T_w)$ will be calculated by $\frac{t}{h}=\frac{(T_i-T_w)}{f(T_w-T_a)}.$ temperature corrections will be made with the relevant

Arrhenius equations. $BO{D}_5$ and coliform microorganism removal efficiencies will be determined by

using the Wehner Wilhelm plot.$].$

c$)$ Could you use this water for irrigation? Briefly evaluate it$.$

d$)$ What is the expected sludge accumulation for $1$ year in the plant?