Landfill gas recovery system and method with pressure symmetry

A landfill gas recovery system, comprising:

• (a) gas collection means disposed in said landfill in proximity to its surface;
• (b) means for maintaining said collection means at a pressure lower than the pressure of said gas in said landfill;
• and
• (c) elongated low-impedance gas path means disposed in said landfill in proximity to, and generally parallel to, its surface at a location spaced from said collection means but in proximity thereto.

A landfill gas recovery system, comprising:

• ( a) gas collection means positioned in said landfill in proximity to the surface thereof;
• (b) means for maintaining said gas collection means at a pressure lower than the pressure of said gas in said landfill;
• and
• (c) equalizing means for at least partially equalizing the gas pressure at a plurality of points in different directions radially outwardly of said collection means.

A method of recovering landfill gas from a landfill, comprising the steps of:

• (a) providing a gas collection zone in said landfill in proximity to its surface;
• (b) maintaining said collection zone at a pressure lower than the pressure of said gas in said landfill;
• and
• (c) at least partially equalizing the pressure of said gas in said landfill in at least a plurality of locations radially outward of said gas collection zone.

A landfill gas recovery system for landfills having hot spots, comprising:

• (a) a primary gas collection means disposed in said landfill in proximity to its surface;
• (b) means for maintaining said primary collection means at a pressure lower than the pressure of said gas in said landfill;
• (c) elongated low-impedance gas path means disposed in said landfill in proximity to, and generally parallel to, its surface at a location spaced from said collection means but in proximity thereto;
• and
• (d) auxiliary gas collection means positioned at said hot spots.