Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:2:p6
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 2 (pt 6/12)
Character Range: 724305–727069

(b) and (c).

Division 5.3.2—Method 1—methane released from wastewater handling (domestic and commercial)

5.25  Method 1—methane released from wastewater handling (domestic and commercial)
 (1) For subparagraph 5.24(1)(a)(i), method 1 is:

where:
Ej is the emissions of methane released by the plant during the year measured in CO2‑e tonnes.
CH4* is the estimated quantity of methane in sludge biogas released by the plant during the year measured in CO2‑e tonnes as determined under subsections (2) and (3).
γ is the factor 6.784 x 10‑4 x GWPmethane converting cubic metres of methane at standard conditions to CO2‑e tonnes.
Qcap is the quantity of methane in sludge biogas captured for combustion for use by the plant during the year measured in cubic metres in accordance with Division 2.3.6.
Qflared is the quantity of methane in sludge biogas flared during the year by the plant measured in cubic metres in accordance with Division 2.3.6.
Qtr is the quantity of methane in sludge biogas transferred out of the plant during the year measured in cubic metres in accordance with Division 2.3.6.
 (2) For subsection (1), if:

is less than or equal to 0.75, then:

where:
CH4gen is the quantity of methane in sludge biogas produced by the plant during the year, estimated in accordance with subsection (5) and measured in CO2‑e tonnes.
 (3) For subsection (1), if:

is greater than 0.75, then:

where:
γ is the factor 6.784 x 10‑4 x GWPmethane converting cubic metres of methane at standard conditions to CO2‑e tonnes.
Qcap is the quantity of methane in sludge biogas captured for combustion by the plant, measured in cubic metres in accordance with Division 2.3.6.
 (4) For subsections (1) and (3), Qcap is to be calculated in accordance with Division 2.3.6.
 (5) For subsection (2):
where:
CODW is the factor worked out as follows:

           where:
           P is the population served by the operation of the plant during the year and measured in numbers of persons.
           DCw is the quantity in tonnes of COD per capita of wastewater for a year using a default of 0.0585 tonnes per person.
CH4gen is the methane generated from commercial wastewater and sludge treatment by the plant during the year measured in CO2‑e tonnes.
CODw is the chemical oxygen demand (COD) in wastewater entering the plant during the year measured in tonnes.
CODsl is the quantity of COD removed as sludge from wastewater and treated in the plant measured in tonnes of COD and worked out as follows:

           where:
           CODpsl is the quantity of COD removed as primary sludge from wastewater and treated in the plant measured in tonnes of COD and estimated under subsection (7).
           CODwasl is the quantity of COD removed as waste activated sludge from