The invention provides an electrically-assisted
anaerobic reactor and a method for producing
methane by treating
sewage. The electrically-assisted
anaerobic reactor comprises an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder and is of a sleeve type structure, and a top cover is arranged at the top of the outer cylinder; the top cover is provided with a water inlet
pipe; the inner
barrel is divided into a plurality of inner
barrel compartments by a plurality of radially arranged inner
barrel partition plates; each inner cylinder compartment is provided with a guide plate; the space between the inner barrel and the outer barrel is divided into a plurality of outer barrel compartments through outer barrel partition plates which are arranged in an up-and-down staggered manner; an outer barrel water outlet
pipe is arranged on the outer barrel; the guide plate guides
water flow to be baffled up and down in each inner cylinder compartment, penetrate through each inner cylinder compartment and enter the outer cylinder from the water outlet hole of the inner cylinder; the
water flow is baffled up and down between the outer cylinder compartments through the outer cylinder partition plates which are staggered up and down and flows out from the outer cylinder water outlet
pipe; the inner cylinder is provided with an inner cylinder
electrode, the outer cylinder is provided with an outer cylinder
electrode, the inner cylinder
electrode and the outer cylinder electrode are connected with a direct-current power supply, through gas circulation, the
methane concentration in the
biogas and the total yield of
methane are increased, and the
sewage energy recovery efficiency is improved.