Can ultrapure water polishing resin be regenerated?

In addition to some special resins can not be recycled, ultrapure water polishing resin is generally able to regenerate, but ultrapure water polishing resin regeneration operation is more difficult than other resins, ultrapure water polishing resin detailed steps can be divided into stratification, regeneration, cleaning, mixing and cleaning.

What is the composition of ultrapure water polishing resin?

Before we can understand the ultrapure water resin regeneration, we first introduce to ultrapure water resin is made up of what, ultrapure water polishing resin is generally consists of two kinds of resin, anion and cation exchange resin could be mixed according to certain proportion, the proportion is 1:1 1:2 or commonly, these two kinds of resin is a kind of cationic exchange resin, The other is anion exchange resin, cation exchange resin will be the cation adsorption in water, and anion exchange resin can be anion adsorption, so that water production to ultrapure water standards, the general ultrapure water resin water resistivity can reach 18 megohms.

Regeneration of ultrapure water polishing resin

1.The hierarchical:

First open the backwash valve and backwash discharge valve. The backwash flow rate should not be too fast, generally around 10m/h, until the Yin and Yang resin stratification is obvious. At the end of backwash, the backwash valve should be closed slowly to make the resin particles gradually settle, so as to achieve the best effect of stratification. If the layering effect is not obvious, multiple layering can be performed.

2.Regeneration:

Yin resin can use concentration of 5% lye (NaOH) regeneration, cleaning time is about 40 minutes, the flow rate should be maintained 6m/h, waste liquid will be discharged from the middle pipe, in order to prevent the lye into the positive resin, you can enter a small amount of water from the bottom and the regeneration of lye together with the middle pipe discharge.

Yang resin is the use of a concentration of 4% acid solution (HCL) cleaning, the time is about 30 minutes, in order to prevent acid into the Yin resin, and the Yin resin for small flow cleaning, therefore, from the alkali into a certain cleaning water, and regenerated acid together from the discharge pipe.

3. Cleaning:

Continue with the flow rate of 6m/h for displacement cleaning, waste liquid in the discharge pipe discharge, Yin resin until the discharge water OH- alkalinity is less than 0.5 [H+] mmol/ L, Yang resin until the discharge water acidity is less than 0.5 [H+] mmol/ L.

4. Mixed

Place the water in the resin tank about 10-500px on top of the resin layer, and then mix. The mixing time should be about 10 minutes, and the pressure should be 1-1.5kg/cm².

5. Washing:

When the equipment is filled with water, open the lower exhaust valve and close the exhaust valve. The forward washing flow rate is the same as the flow rate of the water. When the resistivity of the outlet water is greater than the requirements, the resin can be used normally.