Effect of anaerobic digestate fuel pellet production on Enterobacteriaceae and Salmonella persistence

Autor: Ashley Cathcart, Beatrice M. Smyth, Christina Forbes, Gary Lyons, Simon T. Murray, David Rooney, Christopher R. Johnston
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: GCB Bioenergy, Vol 14, Iss 9, Pp 1055-1064 (2022)
Druh dokumentu: article
ISSN: 1757-1707
1757-1693
08374287
DOI: 10.1111/gcbb.12986
Popis: Abstract Production of digestate pellets for fuel has been identified as a promising circular economy approach to provide renewable energy and additional income to farms, while at the same time presenting the potential to divert raw digestate from nutrient‐saturated land and reduce the risk to water quality. Although previous research has investigated the feasibility of pellet production, there has been little focus on the bio‐safety aspects of the system. Little is currently known about the persistence of bacteria present in the digestate and the potential impacts on human health for those handling this product. The aim of the present research was to determine the effect that each step in the pellet production process has on bacteria numbers: anaerobic digestion, mechanical separation, solid drying, and pelletisation. Enterobacteriaceae enumeration by colony count method was used to quantify bacteria, and the presence of Salmonella at each stage was determined. The Enterobacteriaceae count reduced with each stage, and the final pelletisation step reduced bacteria numbers to below detectable levels (
Databáze: Directory of Open Access Journals
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