Cycle Water Treatment System

This unit shall have removed Acid, salt, caustic CO₂, and aldehydes in cycle water using the following composition.

Cation Exchanger with feed filter section
▪ 1st anion exchanger
▪ Aldehyde removal bed
▪ 2nd anion exchanger
▪ Chemical dosing section

The process can be divided into Service & Regeneration. Service process purpose is to remove sodium acetate in the cycle water. The purpose of the Regeneration process is in the service process, when the exchange capacity of the cation exchange resin reaches the limit , it is used to regenerate the exchange ability of the cation exchange resin by using the chemical.
The regeneration process includes displacement, backwash, settle, chemical feed, slow rinse, fast rinse.

Displacement

After the service process is completed, the cycle water which is filled in the ion exchange tower is discharged together with polished water. The discharged cycle water is transferred to the first anion exchange column in the downstream stage and finally to the treated water tank.

Back Wash

Because the residue due to wear of the ion exchange resin accumulates on the ion exchange resin layer during the service process, it may affect the performance of the equipment, This process is that Polished water is injected to remove the residue.

Settle

During the backwash process, the resin layer rising to the top is reduced to the original state by gravity process.

Chemical Injection

When exchange capacity of the ion exchange resin reaches the limit during the service process, sulfuric acid Thereby reducing the ion exchange capacity. Mixing tee mixes diluted water and sulfuric acid stock solution (98%) and injects sulfuric acid at the proper concentration through the distributor at the upper part of the resin layer of the ion exchange resin tower and discharge it to the bottom. At this time, proper concentration of sulfuric acid reacts with the ion exchange resin to reduce exchange capacity. The wastewater that has completed the reaction with the ion exchange resin is transferred to the neutralization tank.

Slow Rinse

The unreacted state remains in the ion exchange resin layer after the completion of the chemical feed process. Only diluted water is injected to allow sufficient reaction of sulfuric acid. The dilution water injection path is the same as the chemical feed process, and the wastewater that has been reacted is transferred to the neutralization tank.

Fast Rinse

In order to discharge Sulfuric Acid which remains in trace amount after Slow Rinse process, a sufficient amount of polished water has been injected through the upper part, Respectively.