Method and system for synchronously collecting gas and liquid in refuse landfill

The invention discloses a gas-liquid synchronous collection method and system for a refuse landfill, and the method comprises the steps: laying a leachate guide and discharge layer on an impermeable layer of the landfill, and the leachate guide and discharge layer comprises graded gravels and a plurality of leachate and landfill gas mixed guide and discharge pipes embedded in the graded gravels at intervals; the upper part of the percolate and landfill gas mixed guiding and discharging pipe is communicated with the landfill gas collecting branch pipe, and the lower part of the percolate and landfill gas mixed guiding and discharging pipe is communicated with the percolate collecting branch pipe; the leachate collection branch pipes are connected with a leachate treatment system through a liquid pumping device after being converged through a leachate collection header pipe; the landfill gas collecting branch pipes are connected with a landfill gas treatment system through a gas extractor after being converged