41
Don C Augenstein, John R Benemann: Collection of landfill gas at variable rates to match temporal needs for energy generation. Hugh McTavish, July 5, 2011: US07972082 (9 worldwide citation)

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 ...


42
Keum Young Lee: Method and apparatus of controlling landfill gas generation within landfill. Jacobson Holman PLLC, January 1, 2002: US06334737 (9 worldwide citation)

Disclosed herein is a method of controlling the landfill gas generation within the landfill in which leachate is recycled to be continuously injected into a deposit of wastes while extracting the landfill gas from a landfill gas extraction pipe inserted into the waste deposit, comprising steps of:


43
Paul A Kittle: Gas recovery from landfills using aqueous foam. Howson and Howson, August 16, 2005: US06929423 (9 worldwide citation)

Gas is recovered from a landfill by introducing water into the landfill to promote digestion of organic matter in the landfill, and removing from the landfill gas produced by digestion. The improvement comprises the introduction of water as part of an aqueous foam, whereby the water is distributed m ...


44
Ronald L Brookshire, Travis Brookshire: Flow metering device for landfill gas extraction well. EFG & E International, John L Rogitz, July 15, 2003: US06591695 (9 worldwide citation)

A coupling having an integral orifice plate engages upstream and downstream segments of a landfill piping system. Upstream and downstream ports are respectively formed through the walls of the coupling adjacent the orifice plate. The difference in pressure at the ports is correlated to a flow rate t ...


45
Luke N Morrow, Paul D Morrow, David C Morrow: Triple-effect absorption system for recovering methane gas. Robert J Harter, April 20, 2010: US07699914 (8 worldwide citation)

A method of using a triple-effect absorption system to recover methane from landfill gas contaminated with CO2 and trace contaminates such as chlorinated hydrocarbons and aromatics involves processing the landfill gas with three absorbers and a flash system. One absorber uses a solvent to absorb the ...


46
Charles D Elkins: Portable gas monitor. Elkins Earthworks, Fay Sharpe, Brian E Turung, May 1, 2012: US08168121 (8 worldwide citation)

A portable monitor used to measure landfill gas and landfill well parameters. The portable monitor includes a control unit and a measuring unit that can communication wirelessly with one another. The control unit and/or measuring unit can includes a heating arrangement to increase the temperature of ...


47
Bryan W Spencer: Alternate gas fuel burning system. Roberts Gordon, Bean Kauffman & Snyder, October 6, 1998: US05816792 (8 worldwide citation)

A fuel burning system comprises a burner in communication with a burner supply pipe having an automatic two-stage regulator valve for controlling the pressure of fuel gas delivered to the burner. The burner supply pipe is normally fed by a primary supply pipe delivering collected digester or landfil ...


48
Bernard F Duesel Jr, David L Fenton, Michael J Rutsch: Waste heat recovery system. Heartland Technology Partners, Marshall Gerstein & Borun, June 11, 2013: US08459984 (7 worldwide citation)

A waste heat recovery system is coupled to a flare or exhaust stack of, for example, a landfill gas treatment system, to recover at least a portion of the energy within the exhaust produced by the gas treatment system and provides the recovered energy either indirectly or directly to a secondary pro ...


49
Cary V Sorensen, Jeffrey R Bailey: Landfill gas purification method and system. Manufactured Methane, Luedeka Neely and Graham PC, October 19, 2010: US07815713 (7 worldwide citation)

The present disclosure provides a method for separating and purifying a landfill gas stream. In one embodiment, the method includes a step of collecting a crude landfill gas stream which includes at least methane, carbon dioxide, oxygen, and nitrogen gases. The method also includes a step of separat ...


50
Don Churchill Augenstein, John Rudiger Benemann, Ramin Yazdani: Landfill design and method for improved landfill gas capture. Institute for Environmental Management, Hugh McTavish, April 3, 2007: US07198433 (7 worldwide citation)

The invention provides an improved method of collecting biogas from a landfill that results in more complete collection of biogas produced in the landfill, and with less contamination with air. The method involves providing the landfill with an upper gas containment layer near the surface of the lan ...