Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 19, Pages 9059-9067Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.07.021
Keywords
Compost; Pig manure; Indicator microorganisms; Pathogens; Salmonella
Funding
- Higher Education Authority Technological Sector Research Strand I
- Department of Agriculture and Food's Research Stimulus
- Teagasc Walsh
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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 56 days 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(10) CFU/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. (C) 2011 Elsevier Ltd. All rights reserved.
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