Purified water

Purified Water

Purified water is water that has been mechanically filtered or processed to remove impurities and make it suitable for use. Distilled water has been the most common form of purified water, but, in recent years, water is more frequently purified by other processes including capacitive deionization, reverse osmosis, carbon filtering, microfiltration, ultrafiltration, ultraviolet oxidation, or electrodeionization.

Etymology

The term "purified water" is derived from the process of water purification. The word "purify" comes from the Latin word "purificare", which means "to make clean".

Deionization

Deionization is a process that uses specially manufactured ion-exchange resins, which remove ionized salts from the water. This process achieves a high purity level of water. It is worth noting that deionization does not significantly remove uncharged organic molecules, viruses or bacteria, except by incidental trapping in the resin.

Related Terms

• Distilled Water: Water that has been boiled into vapor and condensed back into liquid in a separate container. Impurities in the original water that do not boil below or near the boiling point of water remain in the original container.
• Reverse Osmosis: A water purification process that uses a partially permeable membrane to remove ions, unwanted molecules and larger particles from drinking water.
• Carbon Filtering: A method of filtering that uses a bed of activated carbon to remove contaminants and impurities, using chemical adsorption.
• Microfiltration: A type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane to separate microorganisms and suspended particles from process liquid.
• Ultrafiltration: A variety of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane.
• Ultraviolet Oxidation: A process used in water purification that uses ultraviolet (UV) light to kill microorganisms.
• Electrodeionization: A water treatment technology that utilizes electricity, ion exchange membranes and resin to deionize water and separate dissolved ions (impurities) from water.

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