Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1551446 | Solar Energy | 2011 | 10 Pages |
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.