Hygiénisation d’un lisier de porc par un procédé de traitement thermique en continu : évaluation de l’impact de différentes températures sur la persistance d’indicateurs bactériens et viraux
2012
Cunault, Charles | Burton, C. | Pourcher, A.M. | Gestion environnementale et traitement biologique des déchets (UR GERE) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Université européenne de Bretagne - European University of Brittany (UEB)
[Departement_IRSTEA]Ecotechnologies [TR1_IRSTEA]TED [Axe_IRSTEA]TED-EPURE
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Show more [+] Less [-]English. The heat treatment is an interesting process as it allows the use of the available energy in animal waste and recovers the heat produced. The objective of this study was to evaluate the performance of a thermal pilot plant on E. coli, enterococci, Sulphite-Reducing-Clostridia (SRC),.F+ specific and somatic phages. The slurry is heated through two heat exchangers and maintained 10 minutes for the chosen temperature by passing the flow through a retention unit. The effectiveness of heat treatment was tested for five temperatures (55 to 96 ° C). Identification of colonies that survived to the heat treatment was performed after amplification and sequencing of the 16S rDNA. Ten minutes at 70°C were sufficient to reduce the vegetative bacteria by 4-5 log10 but had little effect on somatic phages or on the spore-formers, dominated by Clostridium sp. At 96°C, somatic phages were still detected and there was a reduction of 3.1 log10 for SRC. The results of this study show that vegetative forms of mesophilic pathogenic bacteria can be removed when the slurry is heated at 60 °C for 1 hour or 70°C for 10 minutes. Treatment at low cost is possible due to heat recovery.
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