How do water purifications systems work?by Eureka Forbes Home Appliance Providers
become an important component of everyday life in today’s polluted world. With
advanced technology, the latest water purifiers can even make water taste
better and preserve essential minerals while purifying the water. But, there
are many types of water purifiers in the market today. Some of them use the
Reverse Osmosis process, also known as RO, the UV ray disinfection,
Ultra-Filtration/UF or sometimes, a combination of two or more methods
the difference between each of these processes is something you need to
understand before choosing the right water purifier, suitable for your home.
Water quality tends to vary in different places and hence, it is important to
understand the process to buy water purifiers that address water
concerns you face in your area.
brief explanation of each of the commonly used purification methods in water
Reverse Osmosis: Osmosis is a term everyone comes across as a part of
study of basic biology. But Reverse Osmosis, as the name suggests is using
energy to force water to pass through a membrane or a very fine water filter
which traps impurities. The filtered water is made free of excess salts,
nitrates and other particles in water. The unfiltered water is then drained
away. This is an explanation of Reverse Osmosis in very simplified terms. But
the RO process is less effective than UV purification systems that destroy
bacteria and viruses.
Ultra Violet/ UV Purification: This method involves the use of a UV
lamp that produces rays called UV-C or Germicidal UV rays that eliminate
pathogens like bacteria and viruses present in the water. These pathogens can
cause harmful diseases and therefore UV lamps are specially required if you
suspect your water to be infected or sourced from stagnant water sources like
lakes or wells. UV filtration alone does not rid the water of solids and other
organic matter dissolved in water. So UV purifiers usually have a pre-treatment
process to remove silt and other organic matter present in water.
Ultra Filtration: Ultra Filtration is similar to Reverse Osmosis as it
involves forcing water to flow through a semi-permeable membrane. The
semi-permeable membrane used for Ultra Filtration has smaller pores than the
one used for Reverse Osmosis and hence can help remove bacteria and other
pathogens to a better extent.
4) Activated Charcoal/Carbon: Most common household filters use activated carbon or charcoal to filter out impurities. This extremely porous material can trap impurities with its large internal surface filled with nooks and crannies. It is effective to remove most common impurities and chemicals like chlorine, pesticides and industrial solvents. However, it cannot treat ‘hard’ water which is the removal of lime. Dissolved hard metals like sodium, nitrates and fluorine, and microbes like bacteria also cannot be removed using activated carbon filters. Another disadvantage is that these filters have to be replaced regularly and are therefore expensive in the long run.
The most common water purification methods are explained above in an extremely simplified manner. For thorough purification, it is advised to use water purifiers that use a combination of two or more of the above listed methods. It is especially important in rural areas where water does not go through any pre-treatment before reaching your taps.
Created on Sep 22nd 2017 09:39. Viewed 748 times.