Fig 1.
Composting plants layouts: a) Plant A, 1 –outdoor area for preparing substrates and maturing compost, 2 –closed compost hall; b) Plant B, 1 –open yard composting area, 2 –outdoor area for preparing substrates and maturing compost.
Table 1.
Experiment matrix for CO emissions measurements from biowaste compost.
Fig 2.
Flux chamber sampling of CO emissions: a) cross-sectional schematic, 1 –flux chamber, 2 –valves, 3 –thermocouple, 4 –purification filter, 5 –silicon tube, 6 –gas analyser, 7 –composting pile; b) flux chamber enclosing emitting surface of a green waste pile in hermetised composting Plant A.
Fig 3.
The top view of composting pile with the location of flux chamber placement for CO emissions measurements.
Locations D1, D4, and D7 represent left side of the pile; D2, D5, and D8 –pile tops, while D3, D6, and D9 represent pile right side.
Fig 4.
Compost properties for piles 1–4 in Plant A (hermitised, A1-A4) and Plant B (open yard, B1-B6): a) dry matter content, %; b) organic dry matter content, % D.M.; c) respiratory activity AT4, mg O2·g DM-1.
Table 2.
Spatial distribution of CO flux (Q) from compost piles in hermetised plant (Plant A) before and after turning.
Table 3.
Spatial distribution of CO flux (Q) from compost piles in open-yard plant (Plant B) before and after turning.
Table 4.
Summary of averaged CO fluxes for hermetised (Plant A) and open (Plant B) piles.
Fig 5.
Concentration of accumulated CO in the hall headspace during 1 h modelled for hermetised plant: a) CO concentration in mg‧m-3, b) CO concentration in ppm.
Table 5.
Correlation between CO and other process gases and temperature in Plant A (hermetised) for a probability level of α = 0,05; statistically significant correlation coefficients are marked with an asterisk, r–Pearson correlation coefficient.
Table 6.
Correlation between CO and other process gases and temperature in Plant B (open) for a probability level of α = 0,05; statistically significant correlation coefficients are marked with an asterisk, r–Pearson correlation coefficient, nd–no data.