Abstract
Waterborne diseases are a major health threat in India. The cost of various water purification systems is also high and need a considerable amount of fuel (wood, LPG etc.) or electrical energy to purify them. Keeping this and the rise in conventional energy prices in mind, we designed an experimental drinking water purification system that makes use of solar energy to purify the biological contaminants that are present in the drinking water. For this nano-Titanium Dioxide (TiO2) coated acrylic tubes are used. By attaching a number of such tubes in parallel connection, a reactor system is constructed. This reactor when exposed to sunlight, with the contaminated water passing through a photocatalytic activity takes place killing the micro-organisms present in the water. Along with this a slow sand filter, a cascaded aeration system and a charcoal filter is introduced to remove turbidity, harmful dissolved gases and heavy metals present in the water. The purification system is used to purify water for drinking purpose and is fixed on rooftops for exposure to sunlight. In this paper, purification of water in the solar reactor for different light intensities and water flow rate is studied. This experimental setup is easily installed in both rural and urban households.
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