SEEK (Sludge to Energy Enterprises in Kampala): co-processing faecal sludge for fuel production
conference contributionposted on 12.02.2018, 15:11 by Barbara J. Ward, Moritz Gold, D. Turyasiima, F. Studer, W. Getkate, J.M. Maiteki, Charles Niwagaba, Linda Strande
The goal of this project was to improve the resource-recovery value of faecal sludge treatment products. A market assessment identified coffee husks, spent grain, and sawdust as optimal organic wastes to coprocess with faecal sludge to increase its fuel value. Drying times of faecal sludge to 90% solids were reduced by half with co-pelletizing with these organic wastes. Briquettes produced with char had comparable heating value, fuel performance, and emissions to charcoal briquettes currently being sold. Use of pellets as a fuel was tested in a gasifier and in several industrial clay kilns (after crushing). High ash content led to clinker formation in the gasifier, but performed well in kilns. The potential market for co-processed faecal sludge fuels is high in Kampala, Uganda, especially among industries, however, the market for pellets needs to be developed.
The author/s would like to extend thanks to REPIC (Promotion of Renewable Energy and Energy Efficiency in Developing and Transitioning Countries, www.repic.ch) and the Symphasis Foundation (www.symphasis.ch) for funding the SEEK project. In addition, the project is grateful for the support of the National Water & Sewerage Corporation of Uganda (NWSC).
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