Characterization of compost produced from separated pig manure and a variety of bulking agents at low initial C/N ratios
2011
Nolan, Tereza | Troy, Shane M. | Healy, Mark G. | Kwapinski, Witold | Leahy, James J. | Lawlor, Peadar G.
The aim of this study was to investigate the composting of separated pig manure solids with or without a variety of bulking agents at a low initial C/N ratio (12.5–23.3). Compost stability was investigated using an oxygen uptake rate (OUR) test and compost maturity was investigated using a germination index test. All treatments showed typical patterns of compost temperature. Temperatures above 60°C were achieved by Day 2, followed by a thermophilic phase (50–60°C), which lasted for 1 to 2weeks followed by a cooling phase. The stability of one of treatments which did not contain any bulking agent – OUR of 25mmol O₂kg⁻¹OMhour⁻¹ – was negatively affected by its initial high water content (69%). The addition of a bulking agent and initial water content below 60% were necessary to compost the separated solid fraction of pig manure at a low initial C/N ratio.
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