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Greenhouse-gas emissions from stockpiled and composted dairy-manure residues and consideration of associated emission factors

J. Biala A C , N. Lovrick B , D. Rowlings A and P. Grace A
+ Author Affiliations
- Author Affiliations

A Institute for Future Environments, Queensland University of Technology, 2 George Street, Brisbane, Qld 4000, Australia.

B Agriculture Services and Biosecurity, Victorian Department of Economic Development, Jobs, Transport and Resources, 83 Gellibrand Street, Colac, Vic. 3250, Australia.

C Corresponding author. Email: j.biala@qut.edu.au

Animal Production Science 56(9) 1432-1441 https://doi.org/10.1071/AN16009
Submitted: 5 January 2016  Accepted: 24 May 2016   Published: 5 July 2016

Abstract

Emissions from stockpiled pond sludge and yard scrapings were compared with composted dairy-manure residues blended with shredded vegetation residues and chicken litter over a 5-month period at a farm in Victoria (Australia). Results showed that methane emissions occurred primarily during the first 30–60 days of stockpiling and composting, with daily emission rates being highest for stockpiled pond sludge. Cumulated methane (CH4) emissions per tonne wet feedstock were highest for stockpiling of pond sludge (969 g CH4/t), followed by composting (682 g CH4/t) and stockpiling of yard scrapings (120 g CH4/t). Sizeable nitrous oxide (N2O) fluxes were observed only when temperatures inside the compost windrow fell below ~45−50°C. Cumulated N2O emissions were highest for composting (159 g N2O/t), followed by stockpiling of pond sludge (103 g N2O/t) and yard scrapings (45 g N2O/t). Adding chicken litter and lime to dairy-manure residues resulted in a very low carbon-to-nitrogen ratio (13 : 1) of the composting mix, and would have brought about significant N2O losses during composting. These field observations suggested that decisions at composting operations, as in many other businesses, are driven more by practical and economic considerations rather than efforts to minimise greenhouse-gas emissions. Total greenhouse-gas emissions (CH4 + N2O), expressed as CO2-e per tonne wet feedstock, were highest for composting (64.4 kg), followed by those for stockpiling of pond sludge (54.5 kg) and yard scraping (16.3 kg). This meant that emissions for composting and stockpiling of pond sludge exceeded the new Australian default emission factors for ‘waste composting’ (49 kg). This paper proposes to express greenhouse-gas emissions from secondary manure-management systems (e.g. composting) also as emissions per tonne wet feedstock, so as to align them with the approach taken for ‘waste composting’ and to facilitate the development of emission-reduction methodologies for improved manure management at the farm level.

Additional keywords: manure management, methane, nitrous oxide.


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