How to Regenerate Deionization Resin for Use in Reverse Osmosis Deionization Systems

In this video we show how to Regenerate Mixed-Bed Deionization Resin for Use in Reverse Osmosis Deionization systems.

A reverse osmosis deionization system purifies water by first subjecting it to reverse osmosis to remove most of the minerals, and then passing it through a column of deionization resin to remove at leftovers. This resin has a very limited capacity and often represents the most expensive recurring cost of such systems. Normally they are discarded when spent, but can be regenerated chemically.

First a 15% solution of sodium hydroxide is prepared by mixing water and sodium hydroxide in a 3/17 ratio by mass. So for 170g of water, 30g of sodium hydroxide are added. This solution is added to spent deionization resin (80mL-200mL). The anion exchange resin component will float to the top while the cation exchange resin component sinks to the bottom. The solution also regenerates the anion exchange resin. The two resins are separate by pouring. The anion exchange resin is repeatedly washed with deionized water. The cation exchange resin is washed a few times with equal volumes of water and then regenerated by mixing with a equal volume of 5% hydrochloric acid (made by mixing 30% hydrochloric acid in a 1:4 ratio with water). After letting it sit for an hour, the cation exchange resin is filtered and also washed repeatedly with deionized water.

The two resins are now regenerated and can be recombined to make mixed-bed deionization resin.

#deionization #resin #regeneration

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