In a demineralization (DM) plant, Weak Base Anion (WBA) resin affects pH, chloride, and conductivity.

 In a demineralization (DM) plant, Weak Base Anion (WBA) resin affects pH, chloride, and conductivity. WBA resins typically lower pH and conductivity compared to Strong Base Anion (SBA) resins when used in a dual-bed system. Chloride levels can also be affected, with WBA resins potentially exhibiting higher chloride leakage than SBA resins. 

Explanation:

pH:

WBA resins tend to lower the pH of demineralized water compared to SBA resins. This is because WBA resins are less effective at neutralizing weak acids, such as CO2 and silica, which can affect pH. 

Chloride:

While WBA resins can remove chloride, they may not be as effective as SBA resins in removing all anions, potentially leading to some chloride leakage. 

Conductivity:

WBA resins, in general, produce lower conductivity water compared to SBA resins. This is because WBA resins are not as effective at removing all dissolved salts and ions from the water. 

Additional Notes:

Dual-Bed Systems:

WBA resins are often used in conjunction with Strong Acid Cation (SAC) resins in a dual-bed demineralization system. 

SBA vs. WBA:

SBA resins are more effective at removing all anions, including those associated with weak acids, resulting in lower pH and conductivity. 

Application:

WBA resins are often used for partial demineralization or as a pre-treatment stage before a more complete demineralization process using SBA resins.