Q$.5($b$)$ A wastewater treatment plant has a flow rate of $0\mathrm{.}5\frac{m^3}{sec}.$ The settling tank at the plant has dimensions of $20m$ long, $3m$ tall and $6m$ wide. If the setting velocity is $0\mathrm{.}0035\frac{m}{sec},$ how much percent of the particles will be removed?

Q$\mathrm{.}5($c$)$ Briefly summarize working principles of $($i$)$ Spiral Concentrators $($ii$)$ Tabling and $($iii$)$

$[5]5$

Jigging. Also, outline the expression for overall efficiency of screen and explain the main

Question $5($b$)$