biostudies-literatureYacob TWUniversity of Colorado BoulderBill and Melinda Gates Foundation214-222https://www.ebi.ac.uk/biostudies/studies/S-EPMC6202436biostudies-literatureUnknown79Pyrolysis of human feces renders the waste free of pathogens and is a potential method of treating fecal sludge waste collected from non-sewered systems. Slow pyrolysis experiments were conducted on human feces and the char yield and gas evolution quantified at 1-10 °C/min heating rates. Char yield ranged from 35.1 to 35.8% (dry mass basis), while the gas yield ranged from 17.2 to 29.6% (dry mass basis). The pyrolysis gases detected were CO, CO₂, CH₄, C₂H₆, and H₂. These non-condensable gases contained a higher heating value (HHV) ranging from 7.2 to 22.8 MJ/Nm³. Kinetic analysis was done by a pyrolysis reaction model free method (Isoconversional) as well as a DAEM (Distributed Activated Energy Model) method that assumes many irreversible first order reactions. Both yielded very close values for activation energy ranging from 141 kJ/mol to 409 kJ/mol, with half of the biomass conversion happening at 241.5 ± 2.9 kJ/mol. The findings of the research provide useful technical information that can guide the design of a pyrolysis system to treat fecal waste. Social acceptance and scale-up issues need to be addressed through further research.Waste management (New York, N.Y.)Pyrolysis of human feces: Gas yield analysis and kinetic modeling.PMC6202436OPP1065047Linden KGChip Fisher RYacob TWWeimer AWfalsePyrolysis of human feces: Gas yield analysis and kinetic modeling.Pyrolysis of human feces renders the waste free of pathogens and is a potential method of treating fecal sludge waste collected from non-sewered systems. Slow pyrolysis experiments were conducted on human feces and the char yield and gas evolution quantified at 1-10 °C/min heating rates. Char yield ranged from 35.1 to 35.8% (dry mass basis), while the gas yield ranged from 17.2 to 29.6% (dry mass basis). The pyrolysis gases detected were CO, CO₂, CH₄, C₂H₆, and H₂. These non-condensable gases contained a higher heating value (HHV) ranging from 7.2 to 22.8 MJ/Nm³. Kinetic analysis was done by a pyrolysis reaction model free method (Isoconversional) as well as a DAEM (Distributed Activated Energy Model) method that assumes many irreversible first order reactions. Both yielded very close values for activation energy ranging from 141 kJ/mol to 409 kJ/mol, with half of the biomass conversion happening at 241.5 ± 2.9 kJ/mol. The findings of the research provide useful technical information that can guide the design of a pyrolysis system to treat fecal waste. Social acceptance and scale-up issues need to be addressed through further research.2018-01-01T00:00:00Z2018 Sep2026-06-20T04:48:41.567Z2026-06-20T03:10:33.659ZS-EPMC62024363034374810.1016/j.wasman.2018.07.020