TY - JOUR
T1 - Long-term sampling of CO2 from waste-to-energy plants: 14C determination methodology, data variation and uncertainty
AU - Fuglsang, Karsten
AU - Pedersen, Niels Hald
AU - Larsen, Anna Warberg
AU - Astrup, Thomas Fruergaard
PY - 2014
Y1 - 2014
N2 - A dedicated sampling and measurement method was developed for long-term measurements of biogenic and fossil-derived CO2 from thermal waste-to-energy processes. Based on long-term sampling of CO2 and 14C determination, plant-specific emission factors can be determined more accurately, and the annual emission of fossil CO2 from waste-to-energy plants can be monitored according to carbon trading schemes and renewable energy certificates. Weekly and monthly measurements were performed at five Danish waste incinerators. Significant variations between fractions of biogenic CO2 emitted were observed, not only over time, but also between plants. From the results of monthly samples at one plant, the annual mean fraction of biogenic CO2 was found to be 69% of the total annual CO2 emissions. From weekly samples, taken every 3 months at the five plants, significant seasonal variations in biogenic CO2 emissions were observed (between 56% and 71% biogenic CO2). These variations confirmed that biomass fractions in the waste can vary considerably, not only from day to day but also from month to month. An uncertainty budget for the measurement method itself showed that the expanded uncertainty of the method was ± 4.0 pmC (95 % confidence interval) at 62 pmC. The long-term sampling method was found to be useful for waste incinerators for determination of annual fossil and biogenic CO2 emissions with relatively low uncertainty.
AB - A dedicated sampling and measurement method was developed for long-term measurements of biogenic and fossil-derived CO2 from thermal waste-to-energy processes. Based on long-term sampling of CO2 and 14C determination, plant-specific emission factors can be determined more accurately, and the annual emission of fossil CO2 from waste-to-energy plants can be monitored according to carbon trading schemes and renewable energy certificates. Weekly and monthly measurements were performed at five Danish waste incinerators. Significant variations between fractions of biogenic CO2 emitted were observed, not only over time, but also between plants. From the results of monthly samples at one plant, the annual mean fraction of biogenic CO2 was found to be 69% of the total annual CO2 emissions. From weekly samples, taken every 3 months at the five plants, significant seasonal variations in biogenic CO2 emissions were observed (between 56% and 71% biogenic CO2). These variations confirmed that biomass fractions in the waste can vary considerably, not only from day to day but also from month to month. An uncertainty budget for the measurement method itself showed that the expanded uncertainty of the method was ± 4.0 pmC (95 % confidence interval) at 62 pmC. The long-term sampling method was found to be useful for waste incinerators for determination of annual fossil and biogenic CO2 emissions with relatively low uncertainty.
U2 - 10.1177/0734242X13517159
DO - 10.1177/0734242X13517159
M3 - Journal article
C2 - 24519225
SN - 0734-242X
VL - 32
SP - 115
EP - 123
JO - Waste Management and Research
JF - Waste Management and Research
IS - 2
ER -