Accounting For Greenhouse Gas Emissions In Wastewater Treatment

摘要

The Greenhouse Gas (GHG) footprints of Perth's three large WWTP's - Woodman Point, Beenyup and Subiaco - were analysed under different upgrade scenarios using three different carbon accounting models. The purpose was to compare the effect of the model on the overall conclusions drawn and to see whether the type of accounting model used determines whether a truly "sustainable" outcome is achieved. The models used were the WSAA industry standard model, the Australian Greenhouse Office (AGO) model and a "comprehensive" model developed through the Alliance. The model used has a significant effect on the conclusions drawn. The AGO model accounts for power used only (scope 1 emission), while the WSAA includes fugitive emissions from site (scope 2). These models were compared with the comprehensive model which extends the 'battery limits' to Scope 3 level, showing very different results. This paper highlights the effect of looking at the "bigger picture", in order to determine truly sustainable design options in the long term. This paper was first presented at Enviro08, May 2008.