My topic for this month is water purification and mechanisms involve in a typical water purifier.
Before going into water purification, let me tell you an interesting fact which tells the importance of a water purifier.
When people working in navy go on ships they carry vessels of water but when water is completely over in the mid of the sea they will use the sea water for drinking by purifying it in the water purifier.
What does water contain?
Water usually has Organic matter mineral salts microorganisms (bacteria viruses' protozoan...) Slate particles which attract bacteria. Dissolved matter like calcium, sulphates, chlorides). (1)
Measurement of purity:
The dissolved matter present in the water is called as Total Dissolved Solids. (TDS).These include minerals, salts, cations anions etc
It is measured in Parts Per Million (ppm) which means one milligram of particles dissolved in one liter of water.
It is measured using TDS meter by which we can know the scale of safety that is if it is below 100 then water is safe to drink.Mechanisms in a Water purifier (4)
1. Earlier purification used to be done by sedimentation and later on water filters were used. A water filter has candles made of ceramic which can trap the microbes and floating matter in the void spaces.
2. Later was Carbon Filtration: Carbon Filters are used which have activated carbon-it can adsorb well all the organic matter.
3. Then Microfilteration in which filter media is used of size less than 0.2 microns and thus biological contamination can be prevented.
4. Then Distillation which is an effective method for house holds. Here water is first boiled and transformed to steam which is condensed and used, but the problem is, even the pesticides and volatile organic compounds will be vaporized.
5. Even Ultraviolet technology is used in which ultraviolet rays are used for killing microbes.
6. Deionization: In this method resins are used which will replace the non water ions with water ions and make the water pure.
7. Reverse osmosis: In this water flows from highly contaminated area to a less contaminated area. This technique is widely used and it will also eliminate the minerals present in water.
Combination of the mechanisms can be used in water purifiers
Do You Know?
* Hot water will freeze faster than cold water.(2)
* If the temperature of water is decreased to -120degC water becomes ultra viscous and even below -135degC a solid with no crystal structure called "Glassy Water".
* Water has memory called "water memory" and so it can recognize particles once dissolved.
* Frozen water which means ice is lighter than water, and that is the reason why ice floats in water.(3)
(2) http://www.neatorama.com/2008/08/22/5-really-weird-things-about- water/
THIS BLOG DOES NOT CONTAIN PLAGIARIZED MATERIAL.