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.
2011 Elsevier Ltd. All rights reserved.
