Abstract—Food waste mixture at carbon to nitrogen (C/N)
ratio 17 was combined with meat, fruits and vegetable wastes to
increase its C/N ratio to 26 and 30 before anaerobic digestion.
Results showed that biogas methane yield obtained during the
digestion increased from 0.352L/gVS, 0.447L/gVS and finally to
a maximum yield of 0.679 L/gVS at C/N ratio of 17, 26 and 30,
respectively. A maximum food waste treatment efficiency of 85%
was obtained at C/N ratio 30. Generally, increase in C/N ratio
through co-digestion resulted in a more stable pH and better
methanogenic activity due to enhanced buffering effect of the
digestion medium.