UFC 3-240-13FN
25 May 2005
2-2.5.4.2.2 System Regeneration. The strong acid cation system is regenerated with
sulfuric acid as described in paragraph 2-2.5.2.
2-2.5.4.2.3 Equipment Requirements. The acid exchanger tank must be made of, or
lined with, an acid-resistant material.
2-2.5.4.2.4 Decarbonator Use. Since blending the two split streams of finished water
also produces CO2, a decarbonator (degasifier or deaerator) is normally used to reduce
the CO2 concentration to 5 to 10 ppm or less. A typical split-stream process is shown in
Figure 2-6.
Figure 2-6. Split-Stream Dealkalizer
Raw W ater
Softener
Anion
Dealkalizer
C arbon Dioxide
and Air
Air
D ecarbonator
Treated W ater
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