A gas and liquid extraction system and method to efficiently capture the gas generated from the decomposition of organic matter, generally referred herein as the biomass, present in a landfill is disclosed herein. The system and method taking in account the presence of high amount of water and propo
A gas and liquid extraction system and method to efficiently capture the gas generated from the decomposition of organic matter, generally referred herein as the biomass, present in a landfill is disclosed herein. The system and method taking in account the presence of high amount of water and proposing landfilling methodology to allow the efficient capture of an as high as possible amount of gas from each and every ton of biomass contained in the landfill which is heterogeneous, anisotropic in nature and unsteady in term of fluid flow behavior.
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1. 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 th
1. 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; andA 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; andWherein 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. 2. The gas and liquid extraction system as recited in claim 1, wherein the liquid extraction mechanism includes a sink hole in which the sloping pipeline discharges liquid. 3. The gas and liquid extraction system as recited in claim 2, wherein the sink hole includes a sump pump. 4. The gas and liquid extraction system as recited in claim 1, further comprising means for transferring liquid from the liquid extraction mechanism back to a vicinity the perforated well. 5. The gas and liquid extraction system as recited in claim 1, wherein the generally cylindrical tube is surrounded by porous drainable material to increase a nominal diameter of the generally cylindrical tube. 6. The gas and liquid extraction system as recited in claim 1, wherein the vacuum source is operable to raise a level of liquid in a straight portion of the first J-shaped siphon, whereby liquid is discharged by gravity from an open end of the first J-shaped siphon. 7. 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 plurality of perforated wells configured to allow gas and liquid through a surface in each perforated well of the plurality of perforated wells and so positioned in the biomass as to have a downward slope of about 2 degrees; each perforated well including a generally cylindrical tube provided with perforations and having a diameter of about ten inches;A vacuum source including a vacuum pump;A pipeline system having a plurality of sloping pipelines, each sloping pipeline interconnecting a corresponding perforated well to the vacuum source; via each sloping pipeline having a downward slope; the pipeline system including a liquid extraction mechanism to extract liquid from the sloping pipelines; the liquid extraction mechanism including, on each sloping pipeline: 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 upstream of the vacuum source;At least one sensing device provided in a vicinity of at least one perforated well of the plurality of wells;A receiver-controller so configured as to control actuation of the leachate and gas valves, of the manifold valves and of the main valves and to receive data from the at least one sensing device;Wherein the receiver-controller determines the actuation of the leachate and gas valves, of the manifold gas valves, and of the main valves depending on the data received from the at least one sensing device so that, for each sloping pipeline and for each corresponding perforated well: The main valve and the manifold gas valve of the sloping pipeline 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;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; andExcess liquid not discharged via the first J-shaped siphon of the sloping pipeline is discharged via the second J-shaped siphon upon opening of the manifold gas valve. 8. The gas and liquid extraction system as recited in claim 7, wherein the plurality of perforated wells are adjacent to one another and wherein the at least one sensing device includes a plurality of piezometers provided between adjacent perforated wells. 9. The gas and liquid extraction method as recited in claim 7, wherein the receiver-controller is so configured as to control the actuation of the leachate and gas valves, of the manifold gas valves, and of the main valves according to a predetermined pattern and to receive corresponding data from the at least one sensing device in view of determining actuation of the leachate and gas valves, of the manifold gas valves, and of the main valves provided on each of the plurality of sloping pipelines to increase gas extraction from the biomass. 10. The gas and liquid extraction system as recited in claim 7, wherein each of the generally cylindrical tubes is surrounded by porous drainable material to increase a nominal diameter of each of the generally cylindrical tubes. 11. A gas and liquid extraction method to extract gas and liquid from a biomass provided in a landfill; the extraction method comprising: Installing a perforated well configured to allow gas and liquid through a surface of the perforated well and on an upper part of a first biomass layer; the perforated well including a generally cylindrical tube provided with perforations and having a diameter of about ten inches and being so installed as to have a downward slope of about 2 degrees;Providing a second biomass layer on top of the first biomass layer;Connecting the perforated well to a vacuum source via a sloping pipeline having a downward slope and including a liquid extraction mechanism; the liquid extraction mechanism including: A leachate and gas valve provided on the sloping pipeline, downstream of the first and second biomass layers;A first generally J-shaped siphon connected to the sloping pipeline, downstream of the leachate and gas valve;A manifold gas valve provided on the sloping pipeline, downstream of the first J-shaped siphon;A second generally J-shaped siphon connected to the sloping pipeline, downstream of the manifold gas valve; andA main valve provided on the sloping pipeline, downstream of the second J- shaped siphon;Opening the main valve and the manifold gas valve to allow a vacuum pump connected to the sloping pipeline downstream of the main valve to selectively apply a vacuum to the sloping pipeline and to the perforated well in order to create a depression in the perforated well to extract gas from at least one of the first and second biomass layers;Closing the main valve and the manifold valve once the depression is created;Gradually opening the leachate and gas valve when the depression is created in order to prime the sloping pipeline and to regulate a flow of the gas into the sloping pipeline and to allow liquid to discharge by gravity from the sloping pipeline via the first J-shaped siphon; andOpening the manifold gas valve to allow liquid not discharged via the first J-shaped siphon to discharge by gravity via the second J-shaped siphon. 12. The gas and liquid extraction method as recited in claim 11, wherein the liquid extraction from the sloping pipeline is done by the liquid extraction mechanism including a sink hole. 13. The gas and liquid extraction method as recited in claim 11, further comprising transferring the extracted liquid back to a vicinity of the perforated well. 14. The gas and liquid extraction method as recited in claim 11, further comprising: providing porous drainable material surrounding the generally cylindrical tube in order to increase a nominal diameter of the generally cylindrical tube.
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