Abstract

The aim of the study was to assess the effect of pasteurisation, as set by the European regulation EC 1774/2002, on selected pathogens and indicator organisms.Unpasteurised substrate (biowaste), including animal by-products from a full-scale biogas plant was heat treated under laboratory conditions at 70 degrees C and 55 degrees C for 30 min and 60 min.Heat treatment at 55 degrees C for 60 min was not sufficient to achieve a hygienically acceptable product. Heat treatment at 70 degrees C for 30 min and 60 min was effective in reducing pathogenic bacteria, Ascaris suum eggs, Swine vesicular disease virus and indicator organisms. However, this level of pasteurisation will still not reduce the quantity of Clostridia spores, or completely inactivate heat-resistant viruses such as Porcine parvovirus or Salmonella phage 28B.The results still give cause for some concern regarding the use of digested residue from biogasplants in agriculture. (C) 2008 Elsevier Ltd. All rights reserved.

Keywords

anaerobic digestion; fertiliser; Campylobacter; enterococci; E. coli O157

Published in

Bioresource Technology
2008, Volume: 99, number: 16, pages: 7859-7865
Publisher: ELSEVIER SCI LTD

SLU Authors

• Danielsson Tham, Marie-Louise

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Agricultural Science


Publication identifier

DOI: https://doi.org/10.1016/j.biortech.2007.09.071

Permanent link to this page (URI)

https://res.slu.se/id/publ/77835