The effect of common sewage sludge treatment processes on oocysts of the coccidian protozoan Cryptosporidium was evaluated in laboratory simulations.
The ability of primary sewage sedimentation to remove Cryptosporidium oocysts was found to be poor.
Thermophilic (55oC) aerobic digestion and sludge pasteurization at the same temperature were found to be effective treatments to inactivate Cryptosporidium oocysts.
Approximately 10% of the oocyst population were found to be viable after 18 d exposure to mesophilic (35oC) anaerobically digesting sludge.
The viability of Cryptosporidium oocysts decreased within the range 20-40% in sludge-treated soil mesocosms over 30 d. The survival results obtained, however, indicated that oocysts would survive well beyond this period.
Mots-clés Pascal : Boue résiduaire, Traitement biologique, Digestion aérobie, Digestion anaérobie, Pasteurisation, Sédimentation, Cryptosporidium parvum, Oocyste, Etude en laboratoire, Viabilité, Sporozoa, Protozoa
Mots-clés Pascal anglais : Sewage sludge, Biological treatment, Aerobic digestion, Anaerobic digestion, Pasteurization, Sedimentation, Cryptosporidium parvum, Oocyst, Laboratory study, Viability, Sporozoa, Protozoa
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0149321
Code Inist : 002B30A02A. Création : 09/06/1995.