An assessment of pathogen removal during composting of the separated solid fraction of pig manure

Mc Carthy, Gemma and Lawlor, Peadar G. and Coffey, Lee and Nolan, Tereza and Gutierrez, Montserrat and Gardiner, Gillian E. (2011) An assessment of pathogen removal during composting of the separated solid fraction of pig manure. Bioresource Technology, 102 (19). pp. 9059-9067. ISSN 0960-8524

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The aim was to investigate pathogen survival during composting of pig manure solids with and without bulking agents in two trials of 56days duration, each with four treatments. Salmonella was detected in the sawdust and straw bulking agents but was undetectable in the compost, except in one treatment at day 0. Enteric indicator organisms were reduced by day 7 (P<0.001) and were undetectable in the final compost, except for coliform which were present at 3.66-4.43log 10CFU/g. Yeasts and moulds were reduced and aerobic spore-formers remained stable in one trial but both increased in the other (P<0.001). Bacillus licheniformis and Clostridium sporogenes were the predominant culturable spore-forming bacteria recovered. Microbial counts were influenced by the bulking agent but only at particular time points (P<0.05). Overall, the pig manure-derived compost complied with EU regulations for processed manure products, as E. coli and Enterococcus were below limits and it was Salmonella-free.

Item Type: Article
Additional Information: Funding Information: We thank Shane Troy for assistance with compost sampling, Rachel Moran, Laura O’Connor, Tony O’Brien and Anne Murphy for technical assistance, John Hannon for help with the construction of dendrograms and Laurie O’Sullivan for critiquing the manuscript. Funding was provided by the Higher Education Authority Technological Sector Research Strand I Programme and the Department of Agriculture and Food’s Research Stimulus Fund Programme . G. Mc Carthy’s PhD is funded by the Teagasc Walsh Fellowship Scheme.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1500/1502
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:04
Last Modified: 02 Jul 2023 06:20

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