Patent ID: 8864413

Claim:
A gas and liquid extraction system to be installed in a landfill to extract gas and liquid from a biomass present in the landfill; the gas and liquid extraction system comprising: A perforated well configured to allow gas and liquid through a surface of the perforated well and so positioned in the biomass as to have a downward slope of about 2 degrees; the perforated well including a generally cylindrical tube provided with perforations and having a diameter of about ten inches; A sloping pipeline connected to the perforated well and having a downward slope; the sloping pipeline including a liquid extraction mechanism to extract liquid from the sloping pipeline; the liquid extraction mechanism including: A leachate and gas valve provided on the sloping pipeline, downstream of the biomass, A first generally J-shaped siphon so connected to the sloping pipeline, downstream of the leachate and gas valve, as to discharge liquid by gravity; A manifold gas valve provided on the sloping pipeline, downstream of the first J-shaped siphon; A second generally J-shaped siphon so connected to the sloping pipeline, downstream of the manifold gas valve, as to discharge liquid by gravity; A main valve provided on the sloping pipeline downstream of the second J-shaped siphon; and A vacuum source including a vacuum pump and connected to the sloping pipeline downstream of the main valve; Wherein the main valve and the manifold gas valve are operative to open to allow the vacuum source to selectively apply a vacuum to the sloping pipeline and to the perforated well in order to extract gas from the sloping pipeline and to close once a depression is created in the perforated well; Wherein the leachate and gas valve is operative to gradually open when the depression is created in order to prime the sloping pipeline and to regulate a flow of the gas into the sloping pipeline while allowing the liquid to discharge via the first J-shaped siphon; and Wherein excess liquid not discharged via the first J-shaped siphon is discharged via the second J-shaped siphon upon opening of the manifold gas valve.