Investigating the microbial inactivation efficiency of a 25 L batch solar disinfection (SODIS) reactor enhanced with a compound parabolic collector (CPC) for household use
✍ Scribed by Eunice Ubomba-Jaswa; Pilar Fernández-Ibáñez; Christian Navntoft; M. Inmaculada Polo-López; Kevin G. McGuigan
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Tongue
- English
- Weight
- 339 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
BACKGROUND: A simple point‐of‐use solar disinfection (SODIS) reactor was designed to treat 25 L of water and was constructed from a methacrylate tube placed along the linear focus of a compound parabolic concentrator (CPC) and mounted at 37° inclination. Experiments were carried out over a 7 month period by seeding a 10^6^ CFU mL^−1^ concentration of Escherichia coli K‐12 in 25 L of well water or turbid water to mimic field conditions and determine the microbial effectiveness of the reactor.
RESULTS: During periods of strong sunlight, complete inactivation of bacteria occurred in under 6 h, even with water temperatures < 40 °C. Under cloudy and low solar intensity conditions, prolonged exposure was needed. Turbid water (100 NTU) was disinfected in 7 h with water temperatures > 50 °C. No regrowth of bacteria occurred within 24 h and 48 h following solar disinfection. The construction cost of this prototype reactor was approximately US$ 200 but with an expected lifetime of 10 years, the running cost of the reactor is expected to be US$ 0.002 L^−1^.
CONCLUSION: This study confirms that significant water disinfection can be achieved using a low cost CPC‐enhanced 25 L batch SODIS reactor. Copyright © 2010 Society of Chemical Industry