Ultraviolet (UV) light is found occupying the portion of the electromagnetic spectrum between X-rays and visible light. The sun emits ultraviolet light; however, much of it is absorbed by the earth’s ozone layer. Just as visible light consists of different colors that become apparent in a rainbow, the UV radiation spectrum is divided into three regions called UVA, UVB and UVC. As sunlight passes through the atmosphere. All UV-C and most UV-B are absorbed by ozone, water vapor, oxygen and carbon dioxide. UV-A is not filtered as significantly by the atmosphere. They differ in their biological activity and the extent to which they can penetrate the skin
Microorganisms are simple organic structures that readily absorb the UV-C wavelength, causing photo-disassociation (destruction). They are inactivated by UV light as a result of damage to nucleic acids. The high energy associated with short wavelength UV energy, primarily at 254 nm, is absorbed by cellular RNA and DNA. A microbes DNA (deoxyribonucleic acid) is the first to be adversely affected due to its weaker molecular bonds. In hundredths of a second it suffers irreparable damage. The subsequent loss of genetic instructions causes cell death and/or the inability to replicate, rendering them harmless. Continuous exposure causes uninterrupted degradation.
This UV-C light is also produced by electric arcs and specialized lights, such as mercury-vapor lamps.
UV System : In this method water flows through the SS Chamber and gets in contact with submerged bank of germicidal lamps housed within quartz Sleeve.
|Disinfection Performance||Excellent||Very Good||Unpredictable|
|Contact time||1-5 Seconds||25-45 minutes||5-10 minutes|
|Water Chemistry change||No||Yes||Yes|