Journal of Engineering and Applied Sciences

Year: 2007
Volume: 2
Issue: 5
Page No. 915 - 919

Performance Evaluation of Solar Radiation as Alternative Disinfection Technique for Well Waters in Ibadan, Nigeria

Authors : Kola Ogedengbe and Christopher O. Akinbile

Abstract: A solar radiation technique was used as a means of disinfection for well waters in parts of Ibadan comprising 8 zones. The zones are Idi-arere, Oke-odo, Oja�ba, Labo, Kudeti, Kobomoje, Bode and Molete. Structured questionnaires were administered to the dwellers of randomly selected houses in the area with (40) shallow-hand dug wells under the zones resulting into 120 respondents, mostly women to obtain baseline information on their general attitude to water use and the overall sanitary features of their wells. Water samples were also taken from the selected wells and analyzed to determine their physiochemical and bacteriological characteristics. A 100 % coliform count reduction was achieved for 4 and 5 L water samples in 7 L container. Seven hours or more of exposure to sunlight was found to be ideal in reducing the coliform count. The degree of disinfection was relatively higher with white (97.9%) and black (98.4%) containers when compared with brown (95%) and blue (82%) containers. With increasing turbidity, the solar radiation efficiency decreases. Ultra Violet Radiation (UVR) was discovered to be the actual disinfection agent rather than the heating effect due to temperature increase. The temperature range of between 23 and 46�C for ambient and between 25 and 45�C for water samples were found to be ideal for the exercise. The experiment provided satisfactory and viable performance when compared with the WHO standard with MPN count found to be 7.2 per 100 mL for 7 h of exposure compared to 2478 per 100 mL before the solar disinfection exercise. Solar disinfection in a tropical country like Nigeria is affordable and can be used by people irrespective of their educational background. This will also reduce the rate of infections and deaths as a result of water related infections especially in this part of the world.

How to cite this article:

Kola Ogedengbe and Christopher O. Akinbile , 2007. Performance Evaluation of Solar Radiation as Alternative Disinfection Technique for Well Waters in Ibadan, Nigeria. Journal of Engineering and Applied Sciences, 2: 915-919.

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