Water and air purification systems are considered for removing impurities from water and air. People have become more health conscious and are using air and water purifiers at home. Drinking water may contain impurities like chemicals, viruses, and bacteria. These impurities should be removed before usage. A water purifier uses various techniques such as reverse osmosis and UV rays treatment.
UV water purifiers utilize ultraviolet rays for destroying bacteria, pathogens and viruses. Short-wave UV rays are found to be more effective for killing pathogens. The reproducing capability of these microbes is destroyed and hence they do not multiple. 99.99 percent of pathogens can be destroyed by UV water purifiers.
Reverse osmosis water purifiers are the most common purifiers in use today. A great range of contaminant removal is possible by these filters. A semi-permeable membrane is used that allows pure water to pass through it. The contaminants are rejected as they are too large to pass through the tiny pores in the membrane. The membranes have pores of 0.0005 micron size. As the size of bacteria is 0.2-1 micron and that of viruses is 0.02-0.4 microns, they cannot pass through the membrane and hence get separated.
Water which is sent to residential areas might not be pure. Many chemicals such as chlorine may be present. Also the storage of water for longer periods of time increases the growth of algae. In order to remove all these impurities, it is necessary to use water purifiers.