Overview of Water Disinfection by UV Technology – A Review

Author(s):

Abhijeet Ashok Paidalwar , GHRCE Nagpur; Isha.P Khedikar, GHRCE Nagpur

Keywords:

Disinfection, irradiation, pathogens, Ultraviolet

Abstract:

Ultraviolet (UV) irradiation is a common disinfection option for water treatment in the developed world. A sufficient dose of ultraviolet light inactivates most microorganisms. Ultraviolet light is produced by an electric arc struck in mercury, or more recently, xenon vapor much like ordinary florescent bulbs. The UV spectrum runs from 100 and 400 nanometers (nm) with the optimal wavelength for bacterial disinfection occurring between 200 and 280 nm. The most UV-resistant organisms are viruses, specifically Adenoviruses, and bacterial spores. The protozoon Acanthamoeba is also highly UV resistant. Bacteria and cysts of Cryptosporidium and Giardia are more susceptible. As with any disinfectant, the process consists of dose and contact time with different organisms being affected differently. The dose for UV is expressed in millijoules per square centimeter. To increase the dose, you can increase the output of the lamp, decrease the distance to the lamp, increase the transmittance of the water or slow the flow through the reaction chamber. The objective of this study was to review the literature on UV disinfection and extract quantitative information about the relation between the inactivation of micro-organisms and the applied UV fluence. The quality of the available studies was evaluated and only high-quality studies were incorporated in the analysis of water disinfection. The results show that UV is effective against all waterborne pathogens.

Other Details:

Manuscript Id	:	IJSTEV2I9051
Published in	:	Volume : 2, Issue : 9
Publication Date	:	01/04/2016
Page(s)	:	213-219

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