Food waste is generally poor in micronutrients important for a stable anaerobic digestion performance. This work evaluated the effect of zinc supplementation (as ZnSO₄ and ZnCl₂ ) at different concentrations (50,70, and 100 mg/L Zn²⁺) to maximize the conversion of organics to methane gas. The intermittent mode (48 h feed and 48 h feedless) was also applied to avoid the reactor failure due to the accumulation of short and long chain fatty acids (SCFAs and LCFAs). The reactor operation was stable and the methane production rate increased from 0.2 to 0.5 L CH₄ /L∙day with 76±1.2% COD removal efficiency, and the methane contentof 61%. Although a stable performance was obtained during the control cycle, the methane yield was low (0.17 L CH₄/g COD_removed ) compared to when zinc was supplemented into the influent at different concentrations (0.28±0.02 L CH₄ /g COD_removed for 50 mg/L Zn²⁺, 0.36 ±0.01 L CH₄ /g COD_removed for 70mg/L Zn²⁺ , and 0.37±0.01 L CH₄ /g COD_removed for 100 mg/L Zn²⁺ ), suggesting the zinc supplementation can enhance the conversion of organic matter to methane to some extent. The supplementation of increasing concentrations of Zn²⁺ generally followed a similar trend regardless of the counter ion used (SO₄^2-and Cl^- ), further confirming the stimulation observed during biogas production was attributable to Zn²⁺ ions. The statistical analysis showed the total SCFAs accumulation, regardless of the zinc supplementation concentration, was significantly different from the control (p<0.05) and among different zinc supplementation levels (p<0.05). Zinc supplementation was also shown efficient on the LCFAs removal. There are statistically significant differences (p<0.05) in the effluent total LCFAs concentration, regardless of the influent supplemented with different zinc concentrations. The disappearance of the unsaturated LCFAs (oleate and linoleate) after the microelement supplementation could be associated to the contribution of both biological and physical (precipitation) removals.