Thesis summary, General Introduction, An evaluation of the limitations of sanitation chain in low income, high density settlements, Build-up and impact of volatile fatty acids on E. coli and A. lumbricoides during co-digestion of urine diverting dehydrating toilet (UDDT-FS) Faeces, Volatile fatty acids (VFA) build-up and its effect on E. coli inactivation during excreta digestion in single-stage and two-stage systems, Anaerobic digestion of Urine Diverting Dehydrating Toilet Faeces (UDDT-FS) in urban poor settlements: Biochemical energy recovery, General discussion, conclusion and recommendations.