196

Sand 1 (pH 3.0)
Sand 1 (pH 4.0)
Sand 2 (pH 4.0)
Sand 5 (pH 4.0)
Sand 12 (pH 4.0)

0.0      2.0     4.0      6.0      8.0     10.0     12.0
Total Iron Content (%)

S   Sand I (pH 3 0)
olSand 1 (pH 4.0)
0   Sand 2 (pH 4.0)
x   Sand 5 (pH 4.0)
+   Sand 12 (pH 4.0)

X

0

(d)

5.5

6.0

6.5

7.0

Final Effluent Solution pH

Fig. 7.14. Effect of (a) TOC, (b) Clay Content, (c) Total Iron Content, and (d)
Final Effluent Solution pH on Rate Constant (Continued).

0.25
0.20

0.15
0.10

,-
0
a
C)
n,'

0.05
0.00

0.25
0.20

0.15
0.10

r-
0
n,

0.05
0.00

5.0

0

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