期刊
ENERGIES
卷 14, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/en14071938
关键词
biogas production; anaerobic digestion; animal by-products; hygienization; thermal pasteurization; pulsed electric field; indicator bacteria
资金
- Regional Council of Brittany, France [ARED-HYDATE]
- Departmental Council of Morbihan, France [CD56-HYDATE]
- European Regional Development Fund-CPER SMART AGRI APIVALE
- French mixed economy company LIGER [2017_00212]
The European Union requires certain animal by-products to be thermally pasteurized to minimize sanitary risk, but research shows that nonthermal technologies like pulsed electric field can achieve similar results. Digestion process also plays a significant role in pathogens inactivation, with thermophilic digestion being more efficient than mesophilic digestion.
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 degrees C. The critical electric field strength was estimated at 18 kV center dot cm(-1) for Ent. faecalis and 1 kV center dot 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.
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