Anaerobic internal circulation reactor based on landfill leachate

The anaerobic internal circulation reactor comprises a tank body, a water distributor, a first-stage three-phase separator and a second-stage three-phase separator, the water distributor is installed at the bottom end in the tank body and comprises a water distribution inlet pipe, a lower water distribution loop and an upper water distribution loop, and one side of the water distribution inlet pipe is connected with a water inlet pipe. According to the utility model, the water distributor is arranged into two parallel square structures, so that water flow respectively enters the upper water distribution loop and the lower water distribution loop along the upper direction and the lower direction during water feeding, the flow of the internal water flow is equally divided, and the probability of accumulation of carried sludge is reduced; meanwhile, the water distribution outlets of the upper water distribution loop and the lower water distribution loop are formed in the square corners, so that water flow is con