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Scope 1 GHG Emissions from Wastewater Treatment Plants Using Dynamic Modeling

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Abstract:

Dynamic process modeling has been applied widely in the design and optimization of wastewater treatment plants for many years. This paper demonstrates how this tool may be used to estimate Scope 1 GHG emissions as well as calculating aeration requirements and sludge production; these can be related to Scope 2/3 estimates. The dynamic modeling approach should provide a much more accurate means for quantifying plant-specific emissions, and can provide a meaningful alternative to the static, population-based emission factors approach. Results generated in this study demonstrate the importance of dynamic loading effects; estimations based on assumptions of steady state will significantly underestimate N2O emissions. Through analysis of a case study, N2O emissions equivalent to 0.3% of the influent TKN load were predicted. When considered in light of their GHG potential, these N2O emissions were about 10 times the emissions due to CO2 from non-biogenic methanol addition, and 100 times the emissions due to fugitive CH4 emissions from the digester.

Keywords: Greenhouse Gas Emissions; Methane; Nitrous Oxide; Scope 1; Wastewater

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864710798193455

Publication date: January 1, 2010

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  • 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 These proceedings are not peer reviewed.

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