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dc.contributor.authorTroy, Shane M.
dc.contributor.authorHealy, Mark G.
dc.identifier.citationTroy, S.M., Nolan, T., Kwapinski, W., Leahy, J.J., Healy, M.G., Lawlor, P. (2012) 'Effect of sawdust addition on composting of separated raw and anaerobically digested pig manure'. Journal Of Environmental Management, 111 :70-77.en_US
dc.descriptionJournal articleen_US
dc.description.abstractManures need the addition of carbon-rich bulking agents to conserve N during composting, which increases the cost of the composting process. The recommended proportion of manure / sawdust, based on a carbon (C): nitrogen (N) ratio, is approximately 3:2. Two composting experiments were conducted to determine the impact of varying the proportion of sawdust to either separated raw, or separated anaerobically digested pig manures. To determine stability and maturity of the final compost, oxygen uptake rate (OUR) and germination index (GI) tests were conducted. For both experiments, three treatments were employed: manure-only (Treatment A), manure / sawdust mixed 4:1, fresh weight (Treatment B), and manure / sawdust mixed 3:2, fresh weight (Treatment C). The mixtures were composted in tumblers for 56 d with regular turning. The composting material was tested over the study duration for temperature, pH, water content, organic matter, C:N ratio and bulk density. For both Treatments B and C, the GI indicated low levels of phytotoxicity, and OUR values were lower than the recommended Irish threshold of 13 mmol O2 kg OM-1h-1, indicating that a high quality compost was produced. The proportion of sawdust to separated manure used can be reduced to make a cost saving, while still producing a stable end-product: 60 % less sawdust is required to compost at a manure-to-sawdust ratio of 4:1 compared to the previously recommended ratio of 3:2.en_US
dc.description.sponsorshipDepartment of Agriculture Food and Fisheries; Teagasc (Walsh Fellowship)en_US
dc.relation.ispartofJournal Of Environmental Managementen
dc.subjectanaerobic digestionen_US
dc.subjectgermination testen_US
dc.titleEffect of sawdust addition on composting of separated raw and anaerobically digested pig manureen_US
dc.contributor.funder|~|Dept of Agriculture & Food |~|
dc.local.contactMark Healy, Dept. Of Civil Engineering, Room E210, Civil Engineering Building, Nui Galway. 5364 Email:

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