Ultraviolet Water Purifiers
Ultraviolet Water Purifiers Information
Ultraviolet water purifiers use germicidal UV (have shorter wavelength that have more intensity than sunlight) to treat water. This device contains inert gas, mercury and a lamp enclosed in a transparent quartz sleeve to act as the source for UV light. The quartz sleeve allows the transmission of the short wavelength UV rays of 2537 Å (maximum germicidal UV) on the water. Normal glass does not reflect rays of wavelength below 3200 Å.
The UV water treatment device works by creating an electric arc which passes through the carrier for the inert gas which is held in a sealed glass tube containing mercury. The heat from the arc vaporizes the mercury to ionize it resulting to the emission of UV radiation.
The emitted UV light contains an intensity of about 250nm to be able to eliminate all the biological contaminants present in water. It should also be fitted with other filtration devices and processes such as (Kinetic Degradation Fluxion) KDF, carbon block and reverse osmosis to enable removal of volatile organic compounds (VOC’s), chlorine and heavy metals among other chemical contaminants. This device can be installed in homes to purify drinking water or in an industry for large-scale production of treated water. It is also very easy to install the device on a rainwater harvesting cistern to purify the collected water which may be for institutional, home or municipal use.
Ultraviolet water purifiers destroy harmful microbes including yeast, bacteria, algae, molds, virus and oocysts that come to the vicinity of the UV light. The microbes absorb the UV radiation via their nucleic acid thereby destroying the structure of their DNA. As a result, the cell of the bacteria gets damaged making them sterile. When compared to the other water treatment mechanisms for eliminating microbes the UV water treatment device is more advantageous. This is because it does not tamper with the water properties no chemicals are added hence there is no release of bi-products. Therefore, the pH and taste of the water among other properties of the water are not altered. As a result, the purified water is suitable for consumption and can be safely used for plumbing and operating the septic system.
Moreover, the design of the device is not complicated thus it is easy to take care of the device and undertake maintenance efforts. Ultraviolet water purifiers demand an annual replacement of the UV bulb to enhance its performance and regular cleaning of the quartz sleeve on the outside only. In addition, unlike chlorine water purification mechanism which extensively demands for operation attention, the UV water treatment device requires minimal supervision as most of the operations are automated.
Another plus is that UV water purifiers are affordable and thus cost-effective even when installed in homes for small-scale use. On the other hand, it consumes a small amount of energy. Its only detrimental is that it requires other filtration mechanisms to eliminate chemical and sediment contaminants in the water. The eliminated contaminants may create a shadow that blocks effective penetration of UV rays. Also, the device needs an electric connect to be able to function. However, untraviolet water purifiers can be adapted to battery use in emergencies.
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