31
Steve Cromeens: System and method for drying sludge using landfill gas. Jenkens & Gilchrist, February 29, 2000: US06029370 (14 worldwide citation)

A system and method using landfill gas to dry wet sludge to inexpensively produce fertilizer or dry waste for disposal, while acting to conserve natural gas resources. The system and method are expected to provide dry sludge as an end product at approximately one-fifth of the cost of conventional me ...


32
Ronald L Brookshire: Flow metering device for landfill gas extraction well. Landfill Gas & Environmental Products, John L Rogitz, April 1, 1997: US05616841 (13 worldwide citation)

A metering pipe for a landfill well includes an upstream segment and a downstream segment. A coupling having an orifice plate positioned therein surroundingly engages both segments. Specifically, the segments are advanced into the coupling toward each other, on opposite sides of the orifice plate fr ...


33
Thomas Lee Hall: Process for the production of naphtha gas from landfill gas. Ecogas Corporation, Conley Rose & Tayon PC, June 6, 2000: US06071326 (13 worldwide citation)

The production of naphtha gas from landfill gas is preferably accomplished through a gas purification step, a catalytic conversion of methane gas to hydrogen gas, and a blending step in which various process streams are blended to produce the naphtha gas stream. The landfill gas stream is first trea ...


34
John R Troost: Method and system for removing volatile organics from landfill gas. Southern Petroleum Laboratories, N Elton Dry, June 25, 1996: US05529612 (13 worldwide citation)

A method for removing volatile organics from landfill gas, in which the landfill gas, which consists primarily of methane and contains volatile organic components, is passed through a quantity of liquid tetraglyme to cause the volatile organic components to be absorbed in the tetraglyme.


35
Don Churchill Augenstein, John Rudiger Benemann, Ramin Yazdani: Landfill design and method for improved landfill gas capture. Institute for Environmental Management, Hugh McTavish, November 11, 2008: US07448828 (13 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 ...


36
Richard L Jenkins, John A Pettus, David K Abner: Instrument and process for testing landfill gas for chlorinated hydrocarbons. Getty Synthetic Fuels, Gordon L Peterson, June 4, 1985: US04521225 (12 worldwide citation)

A method for determining the concentration of chlorinated hydrocarbons in landfill gas by injecting a carrier gas and landfill gas containing chlorinated hydrocarbons through a valve and into a gas chromatographic column containing a column packing capable of separating the chlorinated hydrocarbons. ...


37
Stanley W Zison: Method for projecting landfill gas collection rate of a surface collector. Getty Synthetic Fuels, Gordon L Peterson, December 11, 1984: US04487054 (12 worldwide citation)

A method for projecting the landfill gas collection rate of a surface collector, including removing some of the cover material from the landfill to expose a test area of the refuse in the landfill and measuring the venting rate of the landfill gas through the test area under essentially steady state ...


38
James R Kennelly: Landfill gas well. November 20, 1984: US04483396 (11 worldwide citation)

The gas well includes a plurality of generally tubular gas extracting means which extend from the ground surface downwardly, a lower interval of which means have longitudinally extending slots in the body wall through which gas may enter while the means lower end is closed. The slotted interval resi ...


39
Sircar Shivaji, Koch William Rohrer: Adsorptive separation of methane and carbon dioxide gas mixtures.. Air Prod & Chem, September 10, 1986: EP0193716-A2 (11 worldwide citation)

A process is described for separating gas mixtures containing a primary gaseous component and a secondary gaseous component by selective adsorption of the secondary gaseous component in an adsorptive process including the steps of adsorption in at least one adsorbent bed, rinsing said bed with secon ...


40
Ronald L Brookshire, Travis Brookshire: Flow metering device for landfill gas extraction well. EFG & E International, John L Rogitz, July 15, 2003: US06591695 (11 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 ...