Economic screening of renewable energy technologies: Incineration, anaerobic digestion, and biodiesel as applied to waste water scum.

•Fast economic screening of anaerobic digestion, incineration and biodiesel.•Waste water scum used as model substrate for each renewable energy technology.•Energy and economic potentials estimated using current research and market data.•Production volumes relative to a large wastewater treatment facility in the U.S.•Biodiesel from scum achieved the highest economic potential as a transportation fuel.