Conventional and Innovative Hygienization of Feedstock for Biogas Production: Resistance of Indicator Bacteria to Thermal Pasteurization, Pulsed Electric Field Treatment, and Anaerobic Digestion

Xiaojun Liu, Thomas Lendormi and Jean-Louis Lanoisellé
Additional contact information
Xiaojun Liu: Univ. Bretagne Sud, UMR CNRS 6027, IRDL, F-56300 Pontivy, France
Thomas Lendormi: Univ. Bretagne Sud, UMR CNRS 6027, IRDL, F-56300 Pontivy, France
Jean-Louis Lanoisellé: Univ. Bretagne Sud, UMR CNRS 6027, IRDL, F-56300 Pontivy, France

Energies, 2021, vol. 14, issue 7, 1-20

Abstract: Animal by-products (ABP) can be valorized via anaerobic digestion (AD) for biogas energy generation. The digestate issued from AD process is usually used to fertilize farming land for agricultural activities, which may cause potential sanitary risk to the environment. The European Union (EU) requires that certain ABP be thermally pasteurized in order to minimize this sanitary risk. This process is called hygienization, which can be replaced by alternative nonthermal technologies like pulsed electric field (PEF). In the present study, Enterococcus faecalis ATCC 19433 and Escherichia coli ATCC 25922 were used as indicator bacteria. Their resistance to thermal pasteurization and PEF treatment were characterized. Results show that Ent. faecalis and E. coli are reduced by 5 log10 in less than 1 min during thermal pasteurization at 70 °C. The critical electric field strength was estimated at 18 kV?cm ?1 for Ent. faecalis and 1 kV?cm ?1 for E. coli . “G+” bacteria Ent. faecalis are generally more resistant than “G?” bacteria E. coli . AD process also plays an important role in pathogens inactivation, whose performance depends on the microorganisms considered, digestion temperature, residence time, and type of feedstock. Thermophilic digestion is usually more efficient in pathogens removal than mesophilic digestion.

Keywords: biogas production; anaerobic digestion; animal by-products; hygienization; thermal pasteurization; pulsed electric field; indicator bacteria (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/7/1938/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/7/1938/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:7:p:1938-:d:527679

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().