The invention relates to a method for comprehensively recycling the fecal
sewage of large-scale
livestock and poultry farms and farmland
crop straws, which comprises the following steps of: (1) performing
anaerobic digestion, namely regulating the
solid content of the fecal
sewage of
livestock and poultry to be between 5 and 10 percent, adding
anaerobic digestion inocula, and performing the
anaerobic digestion to generate
methane; (2) performing energy utilization on the
methane, namely purifying the
methane obtained in the step (1) to be used as
fuel gas or allowing the purified methane to be used for power generation to perform energy utilization; (3) performing
solid-liquid separation, namely performing the
solid-liquid separation on
biogas residues and
biogas slurry which are obtainedin the step (1) to obtain the
biogas slurry and the biogas residues of which the
moisture content is about 60 percent; (4) preparing a biological
organic compound fertilizer from the biogas
slurry, and mixing the biogas residues and part of biogas slurry with the straws and part of excrement to perform aerobic
compost; and (5) mixing and performing the aerobic
compost, namely mixing part of biogas slurry obtained in the step (3) and the crushed straws, regulating the
moisture content of the mixture to be between 50 and 60 percent, and performing the aerobic
compost. In the method, clean resources are recovered by the anaerobic
digestion, and the biogas slurry is used for producing the biological
organic compound fertilizer with a high additional value.