Ion Exchange Water Treatment Pdf

Ion exchange is used in water treatment and also provides a method of separation in many non water processes.

Ion exchange water treatment pdf. Wastewater treatment by ion exchange by b a. Sodium zeolite softening is the most widely applied use of ion exchange. It has special utility in chemical synthesis medical research food processing mining agriculture and a variety of other areas. The ion exchange water softening process can remove nearly all calcium and magnesium from source water.

Consumers can check the water softener s manufacturer s rating for removal of these contaminants. A typical water treatment plant consists of the following sections. Standard water softeners are cation exchange devices. While the chemistry of individual ion exchange reactions varies from one application to the next ix is a treatment process where dissolved ions are replaced by other more desirable ions of a similar electrical charge.

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. Cations refer to positively charged ions dissolved in the water. In water treatment applications ion exchange involves the exchange of an ion in the aqueous phase for an ion in the solid phase. Ion exchange ix systems are used across a variety of industries for water softening purification and separation purposes.

Cation exchange involves the replacement of the hardness ions with a nonhardness ion. Treatment of water for human consumption. Ion exchange in water softening water softening is not a wastewater process. This reviewer has always been fascinated by books that have been co authored by workers who work and live in opposite ends of the world.

However it is worth mentioning it because it constitutes the largest application of ion exchange processes water softening consists of removing divalent ions such as ca or mg from water these ions result in the so called water hardness. It removes impurities that are likely to affect the pr performance of downstream units based on ion exchange and or membrane and thermal processes. Spon ltd london and new york 1987 hardcover viii 262 pages isbn 0 41913320 8 24 50 38 22. To soften water you take a cation exchange resin on which the mobile ion inside the beads is sodium na and you pass the hard water through a column filled with the sodium form resin.

The utility of ion exchange rests with the ability to use and reuse the ion exchange material. Impurities removed include suspended. Softeners may also remove as much as 5 10 ppm parts per million. The hardness ions ca and mg move into the resin beads and each of these divalent cations is replaced by two sodium ions getting out of the resin.

In the resin the hardness ions are exchanged with the sodium and the sodium diffuses into the bulk water solution.