Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:2:p8
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 2 (pt 8/12)
Character Range: 729373–732434

aeration and active biological material.

Division 5.3.3—Method 2—methane released from wastewater handling (domestic and commercial)

5.26  Method 2—methane released from wastewater handling (domestic and commercial)
 (1) Method 2 is:

           Step 1. Calculate the amount of emissions of methane released for each sub‑facility of a plant during the reporting year, measured in CO2‑e tonnes, using the equation:

            where:
            γ is the factor 6.784 x 10‑4 x GWPmethane for converting cubic metres of methane at standard conditions to CO2‑e tonnes.
            CH4genz is the estimated quantity of methane in sludge biogas generated by the sub‑facility during the reporting year, worked out in accordance with subsection (2), measured in CO2‑e tonnes.
            Qcapz is the quantity of methane in sludge biogas that is captured for combustion by the sub‑facility during the reporting year, measured in cubic metres in accordance with Division 2.3.6.
            Qflaredz is the quantity of methane in sludge biogas flared by the sub‑facility during the reporting year, measured in cubic metres in accordance with Division 2.3.6.
            Qtrz is the quantity of methane in sludge biogas transferred out of the plant during the reporting year by the sub‑facility, measured in cubic metres in accordance with Division 2.3.6.
                  Note: For the number of sub‑facilities a plant operator may select and requirements in relation to each sub‑facility, see section 5.26A.
           Step 2. To calculate the amount of methane emissions released by the plant during the reporting year, measured in CO2‑e tonnes, add together the amount worked out for each sub‑facility under step 1.
 (2) Subject to subsection (8), the factor CH4genz in subsection (1) is worked out for a sub‑facility as follows:

           Step 1. Calculate the following for the sub‑facility:

            where:
            γ has the same meaning as in step 1 in subsection (1).
            CODeffz is the quantity of COD in effluent leaving the sub‑facility during the reporting year, measured in tonnes of COD and calculated by using:

                (a) facility operating data that measures the volumetric effluent rate and the effluent rate of COD concentration; or
                (b) if data is available on the biochemical oxygen demand (BOD) in the effluent—that data converted to COD in accordance with the following formula:

            CODslz is the quantity of COD removed as sludge from wastewater and treated in the sub‑facility, measured in tonnes of COD and worked out using the formula mentioned in subsection (4).
            CODtrlz is the quantity of COD in sludge transferred out of the sub‑facility and removed to landfill, measured in tonnes of COD.
            CODtroz is the quantity of COD in sludge transferred out of the sub‑facility and removed to a site other than landfill, measured in tonnes of COD.
            CODwz is the quantity of COD in wastewater entering the sub‑facility during the year, measured in tonnes of