Variation in concentration of climate-active substances in emissions from different types of liquid manure processing systems

The amount of climate-active substances emissions depends on the technology and the mode of manure processing. Current methodologies for calculating these emissions are based on aggregated coefficients that do not consider climatic zones or the manure processing technologies in place. The aim of the study was to determine the concentration of climate-active substances in the emissions in dependence to the processing systems of different types of liquid manure. The research was carried out using the experimental unit with a volume of 0.0625 m3 that was designed to simulate the processing of solid and liquid manure under different conditions. As the research material there was used liquid cattle manure, pig liquid manure, and the liquid fractions of both cattle and pig manure. Concentrations of СО2, СН4, H2S, and NH3 were measured with an ELAN Plus gas analyzer. N2O concentration was determined in a gas chromatograph “Crystallux-4000M”. Concentration of СО2 in liquid cattle manure was found to be 537–539 mg/m3, СН4 – 0.02-0.03 %, H2S – 0.147–0.367 mg/m3, and NH3 – 1.97–4.34 mg/m3. Concentration of СО2 in liquid fraction of cattle manure was found to be 537–538 mg/m3, СН4 – 0.02 %, H2S – 0.367–0.327 mg/m3, and NH3 – 2.53–4.08 mg/m3. Concentration of СО2 in pig liquid manure was found to be 537–718 mg/m3, СН4 – 0.02 %, H2S – 0.12–0.177 mg/m3, and NH3 – 4.69–6.97 mg/m3. Concentration of СО2 in liquid fraction of pig manure was found to be 537–592 mg/m3, СН4 – 0.01-0.02 %, H2S – 0.08–0.20 mg/m3, and NH3 – 1.57–2.72 mg/m3. The obtained concentrations of climate-active substances in the emission from processing of liquid cattle manure and its liquid fraction were comparable with the results of similar studies. The differences were less than 20 %.