Anaerobic digestion/co-digestion kinetic potentials of different agro-industrial wastes: A comparative batch study for C/N optimisation.

•Characterisation of different agro-industrial wastes.•Anaerobic digestion potential of agro-industrial wastes at different solid loading.•Four statistical model analysis based on methane yield.•Co-digestion of agro-industrial wastes at different C/N ratios.•Proposal of optimum conditions based on surface optimization model.