Volume No. 7 Issue No.: 2A Page No.: 1085-1089 Oct. - Dec. 2012

 

SOLAR WATER DISINFECTION UNDER REAL CONDITIONS WITH OR WITHOUT SOLAR COLLECTOR

 

Jethwa Kruti* and Dave Shilpa

Civil Engineering Department, Sardar Vallabhbhai National Institute of Technology,Surat (INDIA)

 

Received on : August10, 2012

 

ABSTRACT

 

Solar Water Disinfection (SODIS) is a simple, environmentally sustainable, low-cost solution for drinking water treatment at household level for people consuming microbiologically contaminated water. In the present work, inactivation kinetics of Escherichia coli suspension was studied using PET bottles with different backing surfaces (transmissive and absorptive) and Compound Parabolic Collector (CPC) under real, solar radiation (cloudy and cloudless) conditions. Use of CPCs considerably reduced the time required for complete inactivation of E. coli. Its use would be particularly advantageous during cloudy conditions. Another test for comparing inactivation kinetics of E. coli in tap water with that in distilled water indicated that inactivation rate of E. coli was slightly faster in tap water compared to distilled water due to the presence of natural materials present in tap water. Black painting would especially be advantageous under cloudy conditions when one day exposure would not be enough for complete inactivation of bacteria. The results of the study thus indicates that solar water disinfection is a promising technology for treatment of microbiologically contaminated water in rural areas of developing countries, needing continued development.

 

Keywords : Solar Water Disinfection (SODIS), Compound Parabolic Collector (CPC), Inactivation kinetics, E. coli, Bacteria

 

 

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