Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:3:p1
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 3 (pt 1/5)
Character Range: 743654–746546

3     Open coastal waters (ocean and deep ocean)  0.0

Division 5.3.6—Method 2—emissions of nitrous oxide released from wastewater handling (domestic and commercial)

5.32  Method 2—nitrous oxide released from wastewater handling (domestic and commercial)
 (1) For subparagraph 5.24(1)(b)(ii) and subject to this section, method 2 is the same as method 1 under section 5.31.
 (2) In applying method 1 under section 5.31, nitrogen must be calculated:
 (a) by using facility operating data that measures the volumetric influent and effluent rates and the influent and effluent rates of nitrogen concentrations; or
 (b) for primary wastewater treatment plants, using the following formula:

where:
Nin is the quantity of nitrogen entering the plant during the year, measured in tonnes of nitrogen.
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.
 (3) Wastewater used for the purposes of subsection (2), must be sampled and analysed for nitrogen in accordance with the requirements in sections 5.33, 5.34 and 5.35.

5.33  General requirements for sampling under method 2
 (1) A sample must be representative of the wastewater and the nitrogen 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 must 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.

5.34  Standards for analysis
 (1) Samples of wastewater must be analysed for nitrogen in accordance with:
 (a) ISO 11905‑1:1997; or
 (b) sections 4500‑Norg B, 4500‑Norg C or 4500‑Norg D of APHA (1995); or
 (c) an equivalent Australian or international standard.
 (2) Samples of sludge must be analysed for nitrogen in accordance with:
 (a) EN 13342:2000; or
 (b) section 4500‑Norg B of APHA (1995); or
 (c) an equivalent Australian or international standard.

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

Division 5.3.7—Method 3—emissions of nitrous oxide released from wastewater handling (domestic and commercial)

5.36  Method 3—nitrous oxide released from wastewater handling (domestic and commercial)
 (1) For subparagraph 5.24(1)(b)(iii) and subject to subsection (2), method 3 is the same as method 2 under