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Title: The microbiology of solar water pasteurization, with applications in East Africa
Author: Bob Metcalf
Date: July 2006 (presented at the Granada solar cooking conference)
Abstract: In addition to cooking food, solar cookers can also be used to pasteurize contaminated water, by heating the water to 65°C. To verify that water has been heated to 65°C, a reusable, wax-based water pasteurization indicator (WAPI) is added to the water. When the WAPI wax melts, pasteurization has been accomplished. As part of the Sunny Solutions project in Nyakach, Kenya, women are using the CooKit solar cooker to both cook food and to pasteurize their contaminated water. They report a significant decrease in diarrheal diseases as a result. The Nyakach solar cooks and village leaders have been taught how to use innovative water testing methods, Colilert tubes and Petrifilms to test their water before, and after solar pasteurization. The package of water testing materials, CooKit and WAPI combine to address two main problems in developing countries: lack of wood for cooking and unsafe water for drinking.
Keywords: solar, water, pasteurization, Colilert, Petrifilm.
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Summary Title: The microbiology of solar water pasteurization, with applications in East Africa...