A laboratory study of survival of selected microorganisms after heat treatment of biowaste used in biogas plants.

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.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Sahlström L,Bagge E,Emmoth E,Holmqvist A,Danielsson-Tham ML,Albihn A

doi

10.1016/j.biortech.2007.09.071

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

7859-65

issue

16

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(07)00816-4

journal_volume

99

pub_type

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