You should also ensure that you have the latest version of the NPI Guide

About the manual

The purpose of all emission estimation technique (EET) manuals in this series is to assist Australian manufacturing, industrial, and service facilities to report emissions of listed substances to the National Pollutant Inventory (NPI). This manual describes the procedures and recommended approaches for estimating emissions from facilities engaged in sewage and wastewater treatment.

The sewage and wastewater treatment operations covered in this manual apply to facilities engaged in operating sewage or drainage systems, or sewage treatment plants.

First published in March 1999

Emission estimation techniques used in the manuals

Estimates of emissions of NPI-listed substances to air, water and land should be reported for each substance that triggers a threshold. The reporting list and detailed information on thresholds are contained in the NPI Guide.

In general, there are four types of emission estimation technique (EET) that may be used to estimate emissions from a facility.

Those described in the NPI Guide are:

• sampling or direct measurement
• mass balance
• fuel analysis or other engineering calculations
• emission factors