Anaerobic co-digestion of food waste, human feces, and toilet paper: Methane potential and synergistic effect

•Anaerobic co-digestion of FW, HF, and TP was studied at different mixing ratios.•Co-digestion effect on biogas production was assessed by response surface analysis.•Effects on both methane yield and synergistic effect of co-digestion were assessed.•No antagonistic effect on methane yield was found...

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