초록 ▼

The invention involves a method of collecting biogas from a landfill with a variable rate of collection varied to match periods of greatest need for energy and greatest economic value of energy during a day. The variable collection rate is made possible by a landfill design that includes a gas perme

The invention involves a method of collecting biogas from a landfill with a variable rate of collection varied to match periods of greatest need for energy and greatest economic value of energy during a day. The variable collection rate is made possible by a landfill design that includes a gas permeable layer and a gas containment layer with gas collection from an extraction locus beneath the gas permeable layer. In some embodiments the landfill also includes a porous gas storage layer above the gas-permeable layer.

대표청구항 ▼

What is claimed is: 1. A method of collecting biogas from a landfill having waste and an outer surface contacting the atmosphere, whereinthe landfill contains (i) at or near the outer surface contacting the atmosphere a gas-containment layer that has low gas permeability; and (ii) a gas-permeable la

What is claimed is: 1. A method of collecting biogas from a landfill having waste and an outer surface contacting the atmosphere, whereinthe landfill contains (i) at or near the outer surface contacting the atmosphere a gas-containment layer that has low gas permeability; and (ii) a gas-permeable layer toward the interior of the landfill from the gas-containment layer and toward the exterior of most of the landfill waste mass, the gas-permeable layer having at least 10 times the gas-permeability of the gas-containment layer;the method comprising:(a) collecting biogas from the landfill from a location toward the interior of the landfill from the gas-permeable layer with at least one gas-collection well that collects biogas from an extraction location toward the interior of the landfill from the gas-permeable layer and separated by waste from the gas-permeable layer and draws it to the surface, the well comprising a biogas-collecting wellhead at the extraction location and a conduit linking the wellhead to the surface to draw biogas from the wellhead to the surface;wherein step (a) comprises collecting biogas at a maximal rate for at least one hour and a minimal rate for at least one hour in the same day, wherein the maximal rate of biogas collection in a day is at least 20% more than the minimal rate of biogas collection in the same day for at least two consecutive days.