A system and method of anaerobically digesting ethanol stillage and
reintegrating substantially all by-products thereof back into the system
is disclosed. The system includes an ethanol producing facility for
producing ethanol and an anaerobic digestion facility for anaerobically
digesting stillage from the ethanol producing facility to produce a
plurality of by-products. A plurality of sub-systems utilize the
plurality of by-products from anaerobic digestion to produce a plurality
of end-products. At least one of the plurality of end-products from the
various sub-systems is integrated back into the ethanol producing
facility and into at least one of the sub-systems such that the system of
anaerobically digesting stillage is a continuous and self-sustaining
operation.