Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:2:p11
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 2 (pt 11/12)
Character Range: 737400–740291

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.
 (2) The samples must be collected on enough occasions to produce a representative sample.
 (3) The samples must also be free of bias so that any estimates are neither over nor under estimates of the true value.
 (4) Bias may be tested in accordance with an appropriate standard (if any).
 (5) The value obtained from the sample must only be used for the plant for which it was intended to be representative.

5.28  Standards for analysis
 (1) Samples of wastewater must be analysed for COD in accordance with:
 (a) ISO 6060:1989; or
 (b) sections 5220B, 5220C or 5220D of APHA (1995); or
 (c) an equivalent Australian or international standard.
 (2) Samples of wastewater must be analysed for BOD in accordance with:
 (a) AS 4351.5—1996; or
 (b) section 5210B of APHA (1995); or
 (c) an equivalent Australian or international standard.

5.29  Frequency of sampling and analysis
  Wastewater must be sampled and analysed on at least a monthly basis.

Division 5.3.4—Method 3—methane released from wastewater handling (domestic and commercial)

5.30  Method 3—methane released from wastewater handling (domestic and commercial)
 (1) For subparagraph 5.24(a)(iii) and subject to subsection (2), method 3 is the same as method 2 under section 5.26.
 (2) In applying method 2 under section 5.26, the wastewater must be sampled in accordance with AS/NZS 5667.10:1998 or an equivalent Australian or international standard.

Division 5.3.5—Method 1—emissions of nitrous oxide released from wastewater handling (domestic and commercial)

5.31  Method 1—nitrous oxide released from wastewater handling (domestic and commercial)
 (1) For paragraph 5.24(1)(b), method 1 is:

where:
Ej is the emissions of nitrous oxide released from human sewage treated by the plant during the year, measured in tonnes of nitrous oxide and expressed in CO2‑e tonnes.
Nin is the quantity of nitrogen entering the plant during the year, measured in tonnes of nitrogen and worked out:
 (a) for primary wastewater treatment plants, using the following formula:

where:
Ntrl is the quantity of nitrogen in sludge transferred out of the plant and removed to landfill during the year, measured in tonnes of nitrogen and worked out using the following formula:

Ntro is the quantity of nitrogen in sludge transferred out of the plant and removed to a site other than landfill during the year, measured in tonnes of nitrogen and worked out as follows:

Noutdisij is the quantity of nitrogen leaving the plant, differentiated by discharge environment; or
 (b) for any other kind of wastewater treatment plant, using the following formula:

where:
Protein is