- - - Department of Environmental Health Sciences, Faculty of Public Health, University of Ibadan, Nigeria
- - - Department of Environmental Health Sciences, Faculty of Public Health, University of Ibadan, Nigeria
- - - Department of Environmental Health Sciences, Faculty of Public Health, University of Ibadan, Nigeria
- - - Department of Environmental Health Sciences, Faculty of Public Health, University of Ibadan, Nigeria
- - - Department of Community Health, College of Health Sciences, Obafemi Awolowo University, Nigeria

Purpose Faecal sludge (FS) and organic market waste (MW) have resources that could be recovered by co-composting though not fully explored under changing climatic conditions in Nigeria. This study explored the characteristics and nutrient quality of co-composts produced from pre-treated FS and MW feedstocks in Nigeria. Methods The study was exploratory and analytical in design and co-composting was purposively selected for resource-recovery. The raw faecal sludge (FS) was harvested from septic tanks of households (۵۰%) and institutions (۵۰%) through mechanical evacuation service trucks and dewatered using ۰.۱% gradient sand filter. The biodegradable MW was sorted and used for further studies. The dewatered FS (DFS) and MW were mixed in ratios ۱:۳, ۱:۵ and ۱:۷, respectively with DFS and MW as controls. Each of the mixes was made into ۱m۳ heap and co-composted using the windrow method. The experiments were monitored for ۸۸ days with fortnight composite sampling from each mix (۱۳-weeks). The samples were analyzed for temperature, pH, moisture-contents, micronutrients, macronutrients and pollutants using Standard Methods. Results At maturity, N:P:K (%) indicate good composts at ۹: ۵: ۴, ۱۸: ۷: ۱۹ and ۳: ۳: ۱ in the ۱: ۳, ۱: ۵ and ۱: ۷ mixes, respectively, while those of controls were: ۱۹:۱۲:۱۲ (DFS) and ۱۷:۱۴:۱۱(MW) with no significant differences between experimental and control mixes. Also, four factors extracted (pollutants, agronomic, macronutrients and micronutrients), explained ۷۸.۲% variability. Conclusion The matured co-compost satisfied nutrients and pollutants quality for agricultural use,   recovered organic fertiliser from raw domestic and institutional faecal sludge and market waste.

Resource recovery, Co-composting, Dewatered faecal sludge, Organic market waste, Organic Fertilizer, Nigeria