35Emissions from anaerobic digester leakage or venting events

35 Emissions from anaerobic digester leakage or venting events

(1) The emissions from anaerobic digester leakage or venting events at project treatment facility t during a reporting period are worked out:

(a) if Subdivision 4 of Division 2 is used to work out baseline emissions for the project treatment facility for the reporting period—using equation 14; or

(b) if Subdivision 5 of Division 2 is used to work out baseline emissions for the project treatment facility for the reporting period—as follows:

(i) if the volume of all ineligible material treated in anaerobic digesters at the project treatment facility during the reporting period (ƩwQMat,w,t) is less than 10% of the total volume of material treated in anaerobic digesters during the reporting period (QMat,t), where QMat,w,t and QMat,t are worked out in accordance with the monitoring requirements and w is a type of ineligible material for the project treated in anaerobic digesters at the project treatment facility during the reporting period—the emissions have a default value of zero;
(ii) otherwise—worked out using equation 14.

(2) The emissions from anaerobic digester leakage or venting events at project treatment facility t during the reporting period, EAD,t (in tonnes CO2-e) is worked out using the formula (equation 14):

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EAD,t means the emissions from anaerobic digester leakage or venting events at project treatment facility t during the reporting period, in tonnes CO2-e.

γ means the factor, set out in Part 5.3 of the NGER (Measurement) Determination, that converts cubic metres of methane to tonnes CO2-e at standard conditions.

CF means the correction factor to reflect the proportion of EAD,t that is not accounted for in the calculation of baseline emissions, which is:

(a) if Subdivision 4 of Division 2 is used to work out baseline emissions for project treatment facility t for the reporting period—1; and

(b) if Subdivision 5 of Division 2 is used to work out baseline emissions for project treatment facility t for the reporting period—1 minus WEW,t.

CE means the biogas collection efficiency of an anaerobic digester, (that is, the percentage of biogas generated in an anaerobic digester that is sent to a combustion device), which is 0.98.

MSent t,h means the methane from project treatment facility t sent to combustion device or biogas upgrading system h during the reporting period, in cubic metres, worked out in accordance with section 30.

q means a major venting event associated with an anaerobic digester at project treatment facility t during the reporting period.

MVent,q means the volume of methane vented due to major venting event q during the reporting period, in cubic metres, worked out using equation 15 (section 36).

WEW,t means the proportion of methane generated at project treatment facility t that is generated by eligible wastewater for the project during the reporting period, worked out in accordance with section 26.