(1) When regenerating a strong cation exchange resin with a H2SO4 solution, a stepwise regeneration method should be employed. It is started to regenerate with a low concentration of H2SO4 solution because the concentration of Ca2+ desorbed from the resin is high at this time, but the concentration of SO42 is low, and even if a small amount of CaSO4 precipitate is formed, it is washed away by the solution. Then, the concentration of H2SO4 is gradually increased. At this time, the concentration of Ca2+ desorbed from the resin is low, and no precipitation of CaSO4 is formed.
(2) Since the weak cation exchange resin is regenerated from the regeneration waste liquid of the strong cation exchange resin. Therefore, at the same time as the acid is fed, the weak cation exchanger must be fed into the dilution water (JF9201 filtered water), and the water inlet amount should not exceed the inlet of the exchanger. Also pay attention to observe the color of the regenerated waste liquid discharged from the weak cation exchanger, such as white turbidity, even if the acid concentration is adjusted.
(3) After the acid is added, the weak cation exchanger must be immediately replaced by JF9201 filtered water, and the strong cation exchanger must be immediately replaced by purified water.
(4) In winter, due to the low temperature of the regenerant, calcium pollution is more likely to occur. Therefore, before regeneration, the weak cation exchanger must be scrubbed and backwashed. The pipeline that must be regenerated from the weak cation exchanger and the strong cation exchanger must be backflushed to prevent damage.
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