PRELIM EXAM $-$ PART $2$

ES $213(18)-$ ENVIRONMENTAL ENGINEERING

I. Given : From the data below, fill up the blanks with the correct answers. Show the computations for the DI design.

CATION

$m\frac{g}{L}$

MW$($Molecular Weight$)$

mg$-$mole$/$L

$Ca+2$

a

longrightarrow

$Mg+2$

b

longrightarrow

CATION EXCHANGE CAPACITY : $($DOWEX C$-600)-2\mathrm{.}0e\frac{q}{L}1000me\frac{q}{e}q=$

The volume of cation resin required per day based on $1\mathrm{.}0gpm$ treated water $=$

$D=,\frac{H}{D}=4$

$H=,$

II$.$ What is the Osmotic Pressure in the membrane of the Reverse Osmosis if the analysis of the feed water is :

$\backslash$table$[[,m\frac{g}{L},],[Ca+2,80,],[Mg+2,50,],[K+1,3,],[SO4-2,70,$Temperature is $300$C$.],[NO3-1,2,],[PO4-3,3,],[Cl-1,100,]]$

$\backslash$table$[[$ATOMIC WEIGHTS :$,],[Ca=40,O=16,C=12$