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Weak Acid Hardness Reduction Process
This process for reducing hardness in a water without adding sodium is
accomplished with a weak acid cation exchanger in the hydrogen form
which converts hardness associated with alkalinity to carbon dioxide and
water. The carbon dioxide is removed by a forced draft decarbonator,
which uses air to strip the carbon dioxide. A slight amount of caustic
will increase the pH to the desired level.
For this treatment
technology to be applied, the hardness and alkalinity must be present in
the correct ratio. Since only the temporary hardness (or the hardness
associated with alkalinity) is removed, the water to be treated must
have a sufficient amount of alkalinity in order to achieve the desired
treated water hardness level. |