Sammanfattning

Thermal treatment at temperatures between 46.0 degrees C and 55.0 degrees C was evaluated as a method for sanitization of organic waste, a temperature interval less commonly investigated but important in connection with biological treatment processes. Samples of dairy cow feces inoculated with Salmonella Senftenberg W775, Enterococcus faecalis, bacteriophage phi X174, and porcine parvovirus (PPV) were thermally treated using block thermostats at set temperatures in order to determine time-temperature regimes to achieve sufficient bacterial and viral reduction, and to model the inactivation rate. Pasteurization at 70 degrees C in saline solution was used as a comparison in terms of bacterial and viral reduction and was proven to be effective in rapidly reducing all organisms with the exception of PPV (decimal reduction time of 1.2h). The results presented here can be used to construct time-temperature regimes in terms of bacterial inactivation, with D-values ranging from 0.37h at 55 degrees C to 22.5h at 46.0 degrees C and 0.45h at 55.0 degrees C to 14.5h at 47.5 degrees C for Salmonella Senftenberg W775 and Enterococcus faecalis, respectively and for relevant enteric viruses based on the phi X174 phage with decimal reduction times ranging from 1.5h at 55 degrees C to 16.5h at 46 degrees C. Hence, the study implies that considerably lower treatment temperatures than 70 degrees C can be used to reach a sufficient inactivation of bacterial pathogens and potential process indicator organisms such as the phi X174 phage and raises the question whether PPV is a valuable process indicator organism considering its extreme thermotolerance.

Nyckelord

Bovine feces; D-value; PPV; Salmonella; sanitization treatment; z-value

Publicerad i

Journal of Environmental Science and Health, Part B
2014, Volym: 49, nummer: 9, sidor: 679-689
Utgivare: TAYLOR & FRANCIS INC

SLU författare

• Vinnerås, Björn

  • Institutionen för energi och teknik, Sveriges lantbruksuniversitet
    

• Ottoson, Jakob

  • Institutionen för husdjurens biovetenskaper, Sveriges lantbruksuniversitet
    

Globala målen

SDG12 Säkerställa hållbara konsumtions- och produktionsmönster


UKÄ forskningsämne

Miljö- och naturvårdsvetenskap
Jordbruksvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1080/03601234.2014.922783

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/67659