Modular Humanitarian Sanitation Solution

Sistema.bio is a large-​scale social enterprise that has installed 20,000+ animal waste biodigesters globally. The anaerobic biodigester developed by Sistema.bio transforms human waste to energy. To date, Sistema.bio has installed 120 units globally at households, schools, and for decentralized faecal waste treatment plants. The modular design makes it uniquely suited to humanitarian environments with a 20-​year lifetime and a fast, masonry-​independent installation. A limiting factor to the mass rollout of the biodigester is the need for secondary effluent treatment (pathogen removal) after the biodigester has produced gas. For this project, a prototype effluent pasteuriser (powered by biogas) has been developed to enable implementation and optimisation. The project proposes to operate a pilot biodigester + pasteurisation unit at a treatment plant in Kisumu, Kenya. The installation will include a 20m3 biodigester and a pasteurisation unit. Thermal calculations show that biogas derived should be sufficient to power a pasteuriser to treat waste.


The ultimate goal of the work is to bring a completely modular human waste treatment system to market for use in humanitarian settings. Provisional interviews with key stakeholders (incl. Red Cross, PeaceWinds Japan) have suggested that there is significant demand in humanitarian settings where safe management of human waste consistently a problematic issue that leads to ill health and loss of human life.