A
system for preparing
methane from organic waste, the
system comprising a crushing workshop (1), a premixing and stirring tank (2), a separation workshop (3), a
nitrification tank (4), a rapid
sedimentation tank (5), a biological wall-breaking tank (6), a
biogas digester (7), a gas storage cabinet (8), a gas purification workshop (9), and a power generation workshop (10). Organic waste is crushed in the crushing workshop (1) and then has reused
wastewater added thereto to form a liquefied state, the liquefied organic waste is transported to the premixing and stirring tank (2) for stirring, then the stirred organic waste is pumped into the separation workshop (3) to separate inorganic products, the separated organic products enter the
nitrification tank (4), remain for a certain period of time in the
nitrification tank (4) and then enter the rapid
sedimentation tank (5) for concentration, the concentrated organic products are pumped into the biological wall-breaking tank (6), the organic products subjected to wall breaking enter the
biogas digester (7) to be subjected to anaerobic
fermentation to generate
biogas, the generated biogas flows through the gas storage cabinet (8) and enters the gas purification workshop (9), the purified biogas enters the power generation workshop (10), and generated
electric energy is merged into a
power grid after passing through a
transformer substation. By means of the
system, a variety of organic waste is turned into
methane under the action of
nitrifying bacteria and
methane bacteria.