Essay On Ultraviolet Irradiation

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ABSTRACT
Ultraviolet light (UV) is a general term for electromagnetic radiation emitted from the region of the spectrum lying between x-rays (100nm) and the visible light (400 nm). UV is widely accepted as a reliable, environmentally friendly solution for water disinfection. Ultraviolet (UV) light can be used for the inactivation of drinking water pathogens or the oxidation of micro pollutants
However, UV disinfection is famous and popular around the world for wastewater treatment and water reuse to a great extent and this is due to the fact that unlike chlorine it doesn’t increase effluent toxicity. Pressure from government and environmentalists to eliminate and abolish unwanted chemicals from the ecosystem while providing pathogen free
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Its powerful energy can also be harnessed for other application such as chlorine/ chloramines destruction which is called photolysis.
Ultraviolet (UV) light can be used for the inactivation of drinking water pathogens or the oxidation of micro pollutants. In the latter capacity, it is frequently used in combination with hydrogen peroxide as a part of an advanced oxidation process. UV disinfection or oxidation is a physical process that uses UV light and does not need or require addition of any chemicals. This technology and innovation is known for its germicidal power in inactivating microorganisms (i.e. bacteria, viruses, algae, etc.) including chlorine-resistant
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Pulp and paper industry - ozone/UV system is used;
The advanced photocatalytic oxidation of the pulp and paper industry effluent (primary clarified and biotreated) has been studied with UV/TiO2 and UV/TiO2/H2O2 treatment processes for environmental load reduction. Addition of hydrogen peroxide to the UV/TiO2 system enhances the photoprocess performance.
3. Decoloration of textile industry waste waters.
5.1.2Disadvantages of UV
1. Requires maintenance of UV lamps;
2. Photocatalytic Oxidation is very effective at the Pilot Scale, however, a newer water treatment procedure is usually implemented only when its cost is lower than 2 times the costs of technology and procedures currently in use.
5.1.3 Factors Affecting Ultraviolet Performance
1. Solarization and electrode degradation;
2. Fouling from scale films (ie. Iron, Calcium/Magnesium Hardness, Manganese, etc.) and/or from biological films (from micro-organisms) that develop on the surface of UV lamps and/or the quartz glass sleeve;
3. Dissolved organics and inorganics;
4. Clumping of microorganisms;
5. Turbidity;
6. Color;
7. UV Transmittance (UVT);
8. Short-circuiting in water flowing through the UV disinfection chamber.

5.1.4 Advantages of Ultraviolet

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