Article ID Journal Published Year Pages File Type
1551446 Solar Energy 2011 10 Pages PDF
Abstract

For the first time solar disinfection of liters of water containing wild Salmonella sp. and total coliforms was carried out in a compound parabolic collector (CPC) photoreactor at temperatures of almost 50 °C. Using surface water with high turbidity, this treatment was efficient in completely inactivating Salmonella sp. without regrowth during the subsequent 72 h of dark sterile storage. However if the solar treated water is poured in a non- sterile container, bacteria regrowth occurs even if 10 mg L−1 of H2O2 is added before the storage. On the other hand, 30 mg L−1 of H2O2 added when the irradiation started was completely depleted within 2 h and did not prevent bacterial regrowth during post-irradiation storage in non-sterile containers, demonstrating that storage of large volumes of water treated by solar irradiation was not optimal. Finally, total coliforms (Escherichia coli included) showed a far higher sensitivity than Salmonella sp. and demonstrated to be an inappropriate indicator for monitoring bacterial contamination in water during solar disinfection processes.

► In this study a 18 L solar CPC reactor was successful to inactivate wild Salmonella sp. bacteria present in Burkina Faso real raw waters. ► Inactivated wild Salmonella sp. did not show regrowth after 72 h of dark sterile storage. ► Addition of H2O2 did not prevent bacterial regrowth during post-irradiation storage in non-sterile containers.

Related Topics
Physical Sciences and Engineering Energy Renewable Energy, Sustainability and the Environment
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