Greenhouse gas (GHG) emissions and the carbon footprint of wastewater treatment facilities have quickly become important topics of interest to municipalities and utilities. Nitrous oxide (N2O) is a powerful GHG with a global warming potential approximately 300 x carbon dioxide
and it can be generated by microorganisms within a bioreactor. Oxygen is a key substrate that influences the N2O generation potential. Provision of excess oxygen to the bioreactor can practically eliminate N2O generation, but such an approach comes at a cost in terms of power needed
to supply oxygen and carbon dioxide equivalents associated with off-site electrical power generation. This paper examines the sensitivity of a strategy to reduce the bioreactor N2O generation potential, in the context of minimizing total GHG emissions, in a hypothetical treatment
facility where off-site electricity is produced by one of three primary sources: hydropower, nuclear and coal (no carbon capture/sequestration) that reflect primary electricity production in the Canadian provinces of British Columbia, Ontario and Alberta, respectively.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.