Technological options for safe resource recovery from fecal sludge.
Nikiema, J.; Cofie, O.; Impraim, R. 2014. Technological options for safe resource recovery from fecal sludge. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). 47p. (IWMI/WLE Resource Recovery and Reuse Series 2). [doi: 10.5337/2014.228]
Fecal sludge contains important quantities of organic matter and nutrients that are valuable for agricultural production. Several approaches have been attempted over time for recovery of these assets. This report describes technical solutions for the recycling of fecal sludge from on-site sanitation systems, such as septic tanks, to turn this common environmental and health challenge into a safe fertilizer. The valorization steps include dewatering, composting and – depending on market demand – compost pelletization. A case study of fecal sludge-based pellets produced with locally constructed machinery is provided. Other case studies on pellets produced from non-composted raw materials, such as dewatered fecal sludge, are also provided to highlight the key achievable features of different technologies.