cation exchange resin

Strong acidic cation exchange resins (such as DIAION SK1B) have much better stability and longer service life than anionic resins.

Generally about 5 years (or longer, depending on the environment, used as a catalyst, sometimes as short as one year, soft water has been used for more than 10 years).

The residual exchange groups with an exchange capacity reduced from 2.0 eq/L to below 1.8 eq/L exist inside the resin, resulting in lower efficiency in use.

The regeneration dose of the laboratory analyzed resin is 2045g HCI/L, which is approximately 20 times the forward regeneration and 40 times the reverse regeneration.

The lifespan of weakly acidic cation resin is slightly the same as that of strong acid, with an exchange capacity of 4.5 eq/L reduced to over 3.2 eq/L, and a water content of about 46% increased to 50%, resulting in lower efficiency. Manufacturers of pure water treatment equipment generally have a pH greater than 6 as the cycle endpoint.

Anion exchange resin

After four years of use (depending on the environment and subject to significant changes in temperature and oxidation, organic pollution should also be considered), when the total exchange capacity of pure water treatment equipment manufacturers drops from about 1.3 eq/L to 1.0~1.2 eq/L, the efficiency decreases.

When the total exchange capacity drops to 1.0 eq/L, the resin is close to being unusable.

The regeneration dosage of the laboratory analyzed resin is 6000g NaOH/L, which is approximately 50 times the forward regeneration and 100 times the reverse regeneration.

The lifespan of weakly alkaline anion resin is slightly the same as that of strong anion resin, with an exchange capacity of 1.5 eq/L reduced to above 1.0 and a water content of about 52% reduced to 40%, resulting in lower efficiency.

Its lifespan ranges from being used for decolorization to general deionization, and can be used for 2 to 6 years with significant variations. The general endpoint of the cycle is when the pH of the treatment solution is less than 4.

Annual replenishment of ion exchange resin

Reasons for resin supplementation

1. The resin undergoes regeneration (shrinkage), water washing (expansion slightly), and water flow to the endpoint (strong acid and strong alkali resins shrink by about 10%, weak acid and weak alkali expand by about 20% -30%). The process of pure water equipment is caused by resin rupture, and some parts will be washed out of the tank during reverse washing.

2. The above reasons include substrate oxidation or weakening of the switch. The water treatment equipment manufacturer's requirements for this part depend on the water quality and water extraction volume.

Resin replenishment amount

Cations are about 5-10% per year, while anionic resins are about 8-15% per year (depending on water quality requirements, raw water quality, and resin loss).

To supplement the resin, it is necessary to first reverse wash and remove the inferior resin with a height of several centimeters on the upper layer.

If the resin deteriorates to a certain extent, as mentioned above, do not add new resin because the new resin has not been fully utilized and is essentially a bad resin. At this point, after analysis, when fully updated, pure water treatment equipment manufacturers often hope to save money on resin because resin accounts for less than 10% of the treatment liquid cost, but the cost of regenerants accounts for more than 45%. However, they waste more money on regenerants without realizing it.

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Jiajie Pure Water Senior Technology He Gong Pure Water Equipment Ion Exchange, Reclaimed Water Reuse Circulating Water Pre Treatment, EDI Employee Direct Drinking Water, Domestic Drinking Water, Purified Water Treatment Equipment.

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