Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:2:p10
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 2 (pt 10/12)
Character Range: 734749–737664

in subsection (2), CODslz is worked out using the formula:
where:
CODpslz is the quantity of COD removed as primary sludge from wastewater and treated in the sub‑facility measured in tonnes of COD and may be estimated using the formula in subsection (5).
CODwaslz is the quantity of COD removed as waste activated sludge from wastewater and treated in the sub‑facility measured in tonnes of COD and may be estimated using the formula in subsection (6).
 (5) For subsection (4), CODpslz may be estimated in accordance with the following formula:
where:
VSpslz is the estimated volatile solids in the primary sludge.
 (6) For subsection (4), CODwaslz may be estimated in accordance with the following formula:
where:
VSwaslz is the estimated volatile solids in the waste activated sludge.
 (7) Wastewater used for the purposes of subsection (2) must be sampled and analysed for COD in accordance with the requirements in sections 5.27, 5.28 and 5.29.
 (8) If the sub‑facility is an anaerobic sludge lagoon, the method set out in the document entitled "Fugitive Emissions from Sludge Lagoons Technical Paper", published by the Water Services Association of Australia in April 2014, may be used to estimate CH4genz for the sub‑facility.
Note: The Fugitive Emissions from Sludge Lagoons Technical Paper could in 2014 be viewed on the Water Services Association of Australia's website (http://www.wsaa.asn.au).
 (9) In this section:
methane correction factor is the fraction of COD anaerobically treated.
Note: IPCC default methane correction factors for various types of treatment are as follows:
(a) managed aerobic treatment: 0;
(b) unmanaged aerobic treatment: 0.3;
(c) anaerobic digester/reactor: 0.8;
(d) shallow anaerobic lagoon (<2 metres): 0.2;
(e) deep anaerobic lagoon (>2 metres): 0.8.
primary sludge means sludge from the first major treatment process in a wastewater treatment facility that is designed primarily to remove a substantial amount of suspended matter but little or no colloidal or dissolved matter.
waste activated sludge means sludge from a secondary treatment process in a wastewater treatment facility involving aeration and active biological material.

5.26A  Requirements relating to sub‑facilities
 (1) A plant operator may select one or more sub‑facilities for the plant to estimate emissions released by the plant.
 (2) A sub‑facility selected:
 (a) must be an area within a plant covering a discrete treatment stage; and
 (b) must have a uniform treatment of COD so that the estimates of the methane generated by the sub‑facility are consistent with the principles mentioned in section 1.13; and
 (c) must not be subject to:
 (i) sludge biogas inflow from another sub‑facility; or
 (ii) sludge biogas outflow to another sub‑facility.

5.27  General requirements for sampling under method 2
 (1) A sample must be representative of the wastewater and the COD concentrations at the plant.