a$)$ Verify the design of two different filter processes against the design specification and constraints? List the pollutants to be removed from Filtration processes? Which filtration methods aic easily operated in Saudi? Briefly explain? $(8)$

b$)$ Design of a Sand Filter $A$

Design a new sand filter for a small operation. The estimated flow rate for this site is $1880\frac{m^3}{?}$ day. The surface overflow rate should exceed $x\frac{m^3}{m^2}\frac{?}{d}[$Here$,x=135+$ Fourth Digit of your ID$.1000$ L$/$d d ${?}_{10}<mn>2</mn><mn>0</mn><mn>0</mn><mn>0</mn>$;$L=$ depth$]$ darr $135+0=135$

What will be the surface area of the filter? You can use some leftover Ottawa sand $(d_{10}=0\mathrm{.}00056m)$ from your last filtration project. How deep should the filter be$?($C$3)(6)$

The filter unit can remove $70\%$ of turbidity from the source water. The effluent concentration of the turbidity is found to be $0\mathrm{.}5$ NTU. Calculate the initial concentration of the turbid water? What steps are required to achieve $90\%$ removal from this filter unit $(3+3)$