Q-2, r. 35.3.01 - Regulation respecting manure anaerobic digestion projects eligible for the issuance of offset credits

Section 23 Disposition versions

2023-12-28

23. For the quantification of avoided CH4 emissions attributable to the project, the promoter must calculate the CH4 emissions in the project scenario using Equations 8 to 11:

Equation 8: Calculation of CH4 emissions from the anaerobic digestion of manure

PE = CLE + DE

Where:

PE = CH4 emissions from the project, in metric tonnes CO2 equivalent;

CLE = CH4 emissions attributable to constant leaks of biogas during normal operation of the project facilities, calculated using Equation 9, in metric tonnes CH4;

DE = CH4 emissions attributable to the decomposition of liquid digestate in the manure pits, calculated using Equation 11, in metric tonnes CH4.

Equation 9: Calculation of CH4 emissions attributable to constant leaks of biogas

Where:

CLE = CH4 emissions attributable to constant leaks of biogas during normal operation of the project facilities, in metric tonnes CH4;

n = Number of agricultural facilities;

i = Agricultural facility;

QCH4 max, i = Maximum CH4 production from eligible manure by agricultural facility i, calculated using Equation 4 or Equation 6 for the correction of the volatile solids rate, in cubic metres CH4;

MCFdigester = Conversion factor for CH4 in the digester, default value = 0.70;

0.02 = Default leak factor at anaerobic digestion facility;

WAE = Weighted average efficiency of all CH4 reclamation and destruction devices used, calculated using Equation 10;

0.668 = Density of CH4, in kilograms per cubic metre;

0.001 = Conversion factor, kilograms to metric tonnes.

Equation 10: Calculation of the weighted average efficiency of all CH4 reclamation or destruction devices

Where:

WAE = Weighted average efficiency of all CH4 reclamation and destruction devices used;

y = Number of reclamation or destruction devices used;

d = Reclamation or destruction device;

BGd = Biogas sent to reclamation or destruction device d, in cubic metres of CH4 at standard conditions;

DEFd = Efficiency factor for CH4 reclamation or destruction device, determined in Appendix A.

Equation 11: Calculation of CH4 emissions from digestate storage

Where:

DE = CH4 emissions attributable to the decomposition of digestate while in storage, in metric tonnes CH4;

a = Number of digestate storage systems;

S = Digestate storage system;

n = Number of agricultural facilities;

i = Agricultural facility;

QCH4 max, i = Maximum CH4 production from eligible manure at agricultural facility i, calculated using Equation 4 or Equation 6 for the correction of the volatile solids rate, in cubic metres CH4;

0.668 = Density of CH4, in kilograms per cubic metre;

MCFdigester = Conversion factor for CH4 in the digester, default value = 0.70;

DS = Fraction of digestate sent to storage system S;

MCFS = CH4 conversion factor achieved in the digestate storage system, determined in Table 1 of Appendix D.

When the solid and liquid phases of the digestate are separated, the fraction of the digestate stored in various storage systems must be calculated taking into account the volatile solids removed at separation, as determined in Table 2 of Appendix D.

M.O. 2023-1010, s. 23.

Not in force

In force: 2023-12-28

23. For the quantification of avoided CH4 emissions attributable to the project, the promoter must calculate the CH4 emissions in the project scenario using Equations 8 to 11:

Equation 8: Calculation of CH4 emissions from the anaerobic digestion of manure

PE = CLE + DE

Where:

PE = CH4 emissions from the project, in metric tonnes CO2 equivalent;

CLE = CH4 emissions attributable to constant leaks of biogas during normal operation of the project facilities, calculated using Equation 9, in metric tonnes CH4;

DE = CH4 emissions attributable to the decomposition of liquid digestate in the manure pits, calculated using Equation 11, in metric tonnes CH4.

Equation 9: Calculation of CH4 emissions attributable to constant leaks of biogas

Where:

CLE = CH4 emissions attributable to constant leaks of biogas during normal operation of the project facilities, in metric tonnes CH4;

n = Number of agricultural facilities;

i = Agricultural facility;

QCH4 max, i = Maximum CH4 production from eligible manure by agricultural facility i, calculated using Equation 4 or Equation 6 for the correction of the volatile solids rate, in cubic metres CH4;

MCFdigester = Conversion factor for CH4 in the digester, default value = 0.70;

0.02 = Default leak factor at anaerobic digestion facility;

WAE = Weighted average efficiency of all CH4 reclamation and destruction devices used, calculated using Equation 10;

0.668 = Density of CH4, in kilograms per cubic metre;

0.001 = Conversion factor, kilograms to metric tonnes.

Equation 10: Calculation of the weighted average efficiency of all CH4 reclamation or destruction devices

Where:

WAE = Weighted average efficiency of all CH4 reclamation and destruction devices used;

y = Number of reclamation or destruction devices used;

d = Reclamation or destruction device;

BGd = Biogas sent to reclamation or destruction device d, in cubic metres of CH4 at standard conditions;

DEFd = Efficiency factor for CH4 reclamation or destruction device, determined in Appendix A.

Equation 11: Calculation of CH4 emissions from digestate storage

Where:

DE = CH4 emissions attributable to the decomposition of digestate while in storage, in metric tonnes CH4;

a = Number of digestate storage systems;

S = Digestate storage system;

n = Number of agricultural facilities;

i = Agricultural facility;

QCH4 max, i = Maximum CH4 production from eligible manure at agricultural facility i, calculated using Equation 4 or Equation 6 for the correction of the volatile solids rate, in cubic metres CH4;

0.668 = Density of CH4, in kilograms per cubic metre;

MCFdigester = Conversion factor for CH4 in the digester, default value = 0.70;

DS = Fraction of digestate sent to storage system S;

MCFS = CH4 conversion factor achieved in the digestate storage system, determined in Table 1 of Appendix D.

When the solid and liquid phases of the digestate are separated, the fraction of the digestate stored in various storage systems must be calculated taking into account the volatile solids removed at separation, as determined in Table 2 of Appendix D.

M.O. 2023-1010, s. 23.