Anaerobic treatment method

Abstract

An anaerobic treatment method that can efficiently utilize harvest residues produced in agricultural fields as resources. The anaerobic treatment method causes a raw material including harvest residues produced in an agricultural field to undergo methane fermentation to return fermentation residues produced from the methane fermentation to the agricultural field and to utilize biogas produced from the methane fermentation as an energy source, and includes adjusting a cut length of the harvest residues to be supplied to the methane fermentation based on information about demand for the fermentation residues or the biogas. The method includes adjusting a cut length or average cut length of the harvest residues to be supplied to the methane fermentation to be short in response to an increase in demand for the fermentation residues or the biogas.

Dependencies are inferred from the claim text.