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50

40

s0~-

_o

~ 20
u
X
W

10-

i I I i
1 2 3 4
Initial CI 2 concentration, g/L
FIGURE 10.14 Excess chlorine necessary for greater than 95% con-
version of chlorite to chlorine dioxide. (Source: M. Aieta and J. Berg, "A
Review of Chlorine Dioxide to Drinking Water Treatment, '" Journal
AWWA, vol. 78, no. 6, June 1986, p. 62.)

Chlorine dioxide
solution to process

Packed-tower
generator

Ejector

Chemical
Ejector
feed pumps
water
supply
Chlorite I Hydrochloric acid Chlorine gas
supply supply supply
FIGURE 10.15 Aqueous chlorine-sodium chlorite system schematic
with optional acid food. (Source: M. Aieta and J. Berg, "A Review of Chlo-
rine Dioxide in Drinking Water Treatment," Journal AWWA, vol. 78, no.
6, June 1986, p. 62.)

10.37