Part I

Explain the reasons behind the treatment of domestic wastewater, what are the major constituents targeted for the removal by the wastewater treatment plant?

Part II

A circular secondary clarifier processes a total flow $(Q+Q_r)$ at $7570\frac{m^3}{?}$ day at a MLSS concentration of $2800g\frac{m}{m^3}.$ Given the following batch settling column analysis and a limiting solids flux of hr$).$ Determine the following:

a$)$ Plot solids flux versus solids concentration.

b$)$ Solids underflow concentration, $C_u(g\frac{m}{m^3}).$

c$)$ Diameter $($D$)$ of the secondary clarifier in $($m$).$

d$)$ Clarifier overflow rate, $V_{OR}(\frac{m}{h}r).$

$\backslash$table$[[$TSS $(\frac{g}{m^3}),1500,2600,3950,5420,6950,9000,12000],[V_S(\frac{m}{h}r),5\mathrm{.}00,3\mathrm{.}25,2\mathrm{.}00,1\mathrm{.}00,0\mathrm{.}55,0\mathrm{.}25,0\mathrm{.}13]]$

Hint: $A=\frac{(Q+Q_r)(MLSS)}{G_L}$