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Else_AIEC-INGLE_cH004.qxd 7/1/2006 6:53 PM Page 326
326 4. Adsorption and Ion Exchange

where

3 1
)
a u (1
30 cm
r o
Using the equilibrium relationship:

q o C 1.9 o 0.161 0.802 mol/kg

then
q
max 1.69 10 c m 5 3
/g
C o
The mechanical parameter is

ka
fu 15.73
ka su

And thus:

ka su Z
X T 32.29
11/ u s

For Fr 0.161, 0.839, I A 1.73, and I B 1.12. Then, for C / C 0 X 0.1, X T
T
1.309 ( X i 0.0697). Then,

ka  Z 
su  t  t 22.53 h
T
(1 1/ )  u s 
b

A f e w comments on pol yc yc lic ar oma tic h ydr ocarbons: A large number of polyc yclic
aromatic hydrocarbons (PAHs) are formed mainly during the incomplete comb ustion
of coal, oil and gas, garbage, or other organic substances. In air they can condense on ,
dust particles, making them very dangerous to human health. Their presence in the
aquatic environment should be attributed to the discharges from industrial and w aste-
water treatment plants. In w PAHs also tend to attach to solid particles and gradu- ater
,
v
ally settle to the bottoms of lakes or riers. In soil, they remain for a period of weeks
to months until they are broken down by the action of microorganisms. During that
period, the TSDR, 1995). e through soil to contaminate underground water (A v y may mo