Environmental impact of biogas: A short review of current knowledge

Figures & data

Figure 1. Energy potential of biogas.

Table 1. Emission factors of biogas plants operating direct biogas combustion.

Pollutant	Emission factor (g GJ^−1)	Source
Carbon monoxide (CO)	310	Nielsen et al.,^[^25^]
	256	Kristensen et al.,^[^35^]
Sulphur dioxide (SO2)	25	Nielsen et al.,^[^25^]
Nitrogen oxides (NOx)	202	Nielsen et al.,^[^25^]
	540	Kristensen et al.,^[^35^]
Non-methane volatile organic compounds (NMVOC)	10	Nielsen et al.,^[^25^]
	21.15	Kristensen et al.,^[^35^]
Formaldehyde (CH2O)	8.7	Nielsen et al.,^[^25^]
	14	Kristensen et al.,^[^35^]

Figure 2. Emission potential of biogas plants for NO_x and CO.

Figure 3. Emission potential of biogas plants for formaldehyde, NMVOC and SO₂.

Nielsen, M.; Nielsen, O. K.; Plejdrup, M. Danish emission inventory for stationary combustion plants. Scientific Report from DCE – Danish Centre for Environment and Energy; No. 102; 2014. Available at http://dce2.au.dk/pub/SR102.pdf (Last access January 2018).

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Kristensen, P. G.; Jensen, J. K.; Nielsen, M.; Illerup, J. B. Emission Factors for Gas Fired CHP units <25 MW. Danish Gas Technology Centre and National Environmental Research Institute of Denmark. 2004. Available at http://www.dgc.eu/sites/default/files/filarkiv/documents/C0402_emissions_factors.pdf (Last access January 2018).

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