As all natural cycles start with earth, giving back is an inevitability. Using food waste for Anaerobic digestion which is the process of degradation of a substance in the absence of oxygen in 4 major steps:
Hydrolysis : the cleavage of chemical bonds by adding water.
Acidogenesis: products of the hydrolysis to fatty acids.
Acetogenesis: bacteria consumes precursors and produce acetate.
Methanogenisis: break down of acetic acid to produce methane gas.