While FOG have typically been viewed as a negative influence
they have much to offer AD operations. Addition of FOG to an AD
system has the potential to significantly increase biogas production
[40]. When the theoretical biochemical methane potential
(BMP) of macromolecules is compared, lipids are capable of yielding more methane at 1014 L/kg VS than both proteins at
740 L/kg VS and carbohydrates at 370 L/kg VS [41,22]. These theoretical
values were supported by Labatut [42], with observed specific
biomethane yields ranging from 903.9 to 1101.2 L/kg VS for
lipids, 302.5–407.3 L/kg VS for proteins and 191.8–359.3 L/kg VS
for carbohydrates digested under mesophilic conditions