Sewage Sludge Use in Cement Companies as an Energy Source (SUCCESS) Tool
This Excel-based tool serves to assist decision makers in implementing sludge-end-use-in-cement schemes with optimal economic and environmental outcomes. The environmental and economic costs and benefits associated with burning sewage sludge in cement kilns will vary based on the energy content of the sludge (lower heating value) and the transportation distance between the wastewater treatment plant and proposed cement plant.
The SUCCESS tool is developed to be used primarily in China. However, with a slight modification in units and conversion factors as well as the General and Technical assumptions, it can be used for other countries too.
This tool allows users to input the aforementioned project-specific factors. Subsequently, the Excel model quantifies the associated environmental (e.g., CO2, NOx, Global Warming Potential) and economic profiles of six (6) sludge treatment options (e.g., dewatering, anaerobic digestion, heat drying, etc.) followed by injection into a cement kiln. The results are intended to help decision makers select the most cost-effective sludge treatment prior to transportation and injection of the sludge into the cement kiln, and to determine equitable financial terms for contracts between the wastewater and cement plants.
The tool is designed to provide a comparative summary of the environmental and economic costs and benefits of each sludge treatment option followed by injection into a cement kiln. Users see the allocation of environmental and economic costs and benefits between the wastewater treatment plants and cement plant, as well as the net environmental and economic outcomes for each scenario. To foster transparency, the environmental and economic inputs and calculations for each treatment technology, transportation, and injection into the cement kiln, are left visible to users in dedicated pages for each technology and subsequent sludge handling phase.
This work was supported by the U.S. Environmental Protection Agency, Office of International Affairs through the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
The tool is in beta version and it is being tested now. It will be available from this webpage soon.