How do you recharge ion exchange resin?

How do you recharge ion exchange resin?

The steps are:

  1. Backwash resin bed to separate the cation from the anion resin.
  2. Let the resins settle.
  3. Optionally: drain the water down to the resin bed surface.
  4. Inject caustic soda diluted in demineralised water.
  5. Displace the caustic with dilution water.
  6. Inject acid diluted in demineralised water.

How do ion exchange resin beads work?

The ion exchange chemical process works by removing dissolved ionic contaminants from the water. These ions are swapped for better ones that won’t degrade the quality of your water. Water softeners are very similar to ion exchange systems since both systems can remove magnesium and calcium ions from the water.

What chemical is used to recharge the resin beads?

Sodium chloride is used as the regenerant chemical for converting exhausted softener resin back to the sodium form. The resin exchanges the collected hardness on the bead with the sodium ion present in the sodium chloride. It is applied to the bed at a concentration of 8 to 12%; usually, 10% is the norm.

How do you activate ion exchange resin?

The resin can be recharged by washing it with a solution containing a high concentration of sodium ions (e.g. it has large amounts of common salt (NaCl) dissolved in it). The calcium and magnesium ions migrate from the resin, being replaced by sodium ions from the solution until a new equilibrium is reached.

How long does ion exchange resin last?

about 10 to 15 years
As a general rule, you can expect an ion exchange resin to last about 10 to 15 years in water treatment (as opposed to four to eight years for anion exchange resins).

What is the purpose of ion exchange resin?

Ion exchange resins are used to soften water by replacing the cations with sodium ions (and possibly the anions with chloride ions) of sodium chloride. They may also be used to demineralize water where the cations are replaced by H+ ions and the anions are replaced by OH− ions.

When should I replace ion exchange resin?

Replace only the resin that has been physically damaged. Such resin should be removed from the ion exchange vessel by careful backwashing, and each time the resin volume has visibly or measurably decreased, the missing resin should be replaced.

What is ion exchange resin used for?

Can ion exchange resin be reused?

Ion exchange is a reversible process. The results indicated that cation exchange resin can be reused for several times with good recovery efficiency. After 5 times reuse, the cation exchanger regenerated via 0.5N H2SO4 at 15min contact time achieved about 83.4% recovery efficiency for NH3-N from landfill leachate.

What are the dimensions of ion exchange resin?

Ion exchange resins These are very small plastic beads, with a diameter of about 0.6 mm. These beads are porous and contain invisible water inside the beads, measured as “humidity” or “moisture content”. The structure of the resin is a polymer (like all plastics) on which a fixed ion has been permanently attached.

How are cation exchange resins replaced in water?

At this stage, the resin will be replaced by a fresh resin, or regenerated. If you replace all cations dissolved in water by H+ ions and all anions by OH– ions, these will recombine and form new molecules of water. To do this, you need a cation exchange resin in the H form and an anion exchange resin in the OH form.

Which is an example of anion exchange resin?

cation exchange resin exchange resin Figure 1 – Some examples of ion exchange resins the order of affinity for some common cations is approximately: Hg2+

How is ion exchange used in bulk water demineralization?

Sodium zeolite softening is the most widely applied use of ion exchange. In zeolite softening, water containing scale-forming ions, such as calcium and magnesium, passes through a resin bed containing SAC resin in the sodium form. In the resin, the hardness ions are exchanged with the sodium, and the sodium diffuses into the bulk water solution.