Mixed membrane biological method anaerobic fermentation reactor for kitchen wastewater, and treatment process thereof

The invention relates to a mixed membrane biological method anaerobic fermentation reactor for kitchen wastewater, and a process thereof. The mixed membrane biological method anaerobic fermentation reactor comprises a tank body, the tank body is internally provided with an effluent weir, a three-phase separation zone, a second reaction zone, a first reaction zone, a biogas distribution device, a water distributor and a sludge discharge system in sequence from top to bottom; the second reaction zone and the first reaction zone are both biological filler reaction zones; the biogas distribution device is provided with a gas inlet pipe; the water distributor is communicated with a water inlet mixer outside the tank body, and the water inlet mixer is communicated with a water inlet pipe; a biogas collecting pipe is arranged at the top of the tank body and is connected with the gas inlet pipe; an upper circulating pipe and a middle circulating pipe are further included, and the middle circulating pipe is further co