Ion exchange is a water treatment method where undesirable ions in water are removed by being swapped with less objectionable ions from an exchange substance. Both the contaminant ions and exchange ions must have the same electrical charge and be dissolved. There are cation exchangers that remove positively charged ions, anion exchangers that remove negatively charged ions, and amphoteric exchangers that remove both. Ion exchange has advantages like long resin life, cheap maintenance, and being environmentally friendly, but disadvantages like fouling of resins from substances in some waters.

1. By : Aiman Alimin bin Zainudin

3.  Ion exchange is an exchange of ions
between two electrolytes or between
electrolyte solution and a complex.
 One of the water treatment method where
one or more undesirable ionic contaminants
are removed from water by exchange with
another non-objectionable or less
objectionable ionic substance.

4.  Change hard water to soft water (hard water
contain Mg2+ and Ca2+)
 Ion exchange can be used in wastewater
treatment plants to swap one ion for another
for the purpose of demineralization.

5.  Both the contaminant and the exchange
substance must be dissolved
 Have the same type of electrical charge
(positive and negative).

6.  Cation exchangers that exchange positively
charged ions (cation)
 Anion exchangers that exchange negatively
charged ion (anion)
 Amphoteric exchangers that are able to
exchange both cations and anions
simultaneously.

9.  Advantage
1. Long Life of Resin
2. Cheap maintenance
3. Environmental friendly
 Disadvantage
1. Nature and properties of ion exchange
resins
2. There are substance in some water which
can foul the resin

11.  Ion exchange resin breads