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Paul A Kittle: Gas recovery from landfills using aqueous foam. Howson and Howson, August 16, 2005: US06929423 (8 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 ...


42
John Brady, Greg S Powell, Robin Marks: Landfill gas extraction constant flow control method and device. William Keyworth, Bill & Mary Lou, February 14, 2006: US06999883 (8 worldwide citation)

A control method and apparatus for regulating gas flow from landfill gas wells uses a differential pressure-regulating valve to maintain a set flow through a constant flow wellhead assembly. This wellhead assembly maintains a constant flow from the well despite normal variations in environmental fac ...


43
Luke N Morrow, Paul D Morrow, David C Morrow: Triple-effect absorption system for recovering methane gas. Robert J Harter, April 20, 2010: US07699914 (7 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 ...


44
Bryan W Spencer: Alternate gas fuel burning system. Roberts Gordon, Bean Kauffman & Snyder, October 6, 1998: US05816792 (7 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 ...


45
Robert K Ham: Anaerobic sampling method. Getty Synthetic Fuels, Gordon L Peterson, July 7, 1981: US04276778 (6 worldwide citation)

A method of obtaining a substantially anaerobic sample from a landfill comprising providing a bore hole which opens at the surface of the landfill, substantially sealing off atmospheric air from a zone which includes at least a region of the bore hole to define an essentially anaerobic zone. Refuse ...


46
Cary V Sorensen, Jeffrey R Bailey: Landfill gas purification method and system. Manufactured Methane, Luedeka Neely and Graham PC, October 19, 2010: US07815713 (5 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 ...


47
Floyd E Farha: Sulfur removal using ferrous carbonate absorbent. New Technology Ventures, Locke Lord Bissell & Liddell, June 29, 2010: US07744841 (5 worldwide citation)

Finely divided ferrous carbonate absorbent, siderite granules or absorbent particles made by mixing, agglomerating and shaping finely powdered ferrous carbonate, preferably siderite, in combination with minor effective amounts of water or an optional binder, followed by drying, are used to treat and ...


48
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 (5 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 ...


49
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 (5 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 ...


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