Landfill gas purification method and system

Details Landfill gas purification method and system Landfill gas purification method and system

2007-07-10

2010-10-19

Hopkins, Robert A (Department: 1797)

Gas separation: processes

Selective diffusion of gases

Selective diffusion of gases through substantially solid...

C095S096000, C095S143000, C096S004000, C096S130000, C055S338000

Reexamination Certificate

active

07815713

ABSTRACT:
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 separating the crude landfill gas stream into at least an intermediate landfill gas stream and a first waste gas stream using a membrane separation unit, wherein the intermediate landfill gas stream is enriched in methane and depleted in carbon dioxide relative to the crude landfill gas stream. The method further includes a step of separating the intermediate landfill gas stream into at least a final landfill gas stream and a second waste gas stream using a pressure swing adsorption separation unit, wherein the final landfill gas stream is enriched in methane and depleted in carbon dioxide, oxygen, and nitrogen relative to the intermediate landfill gas stream. In some embodiments. VOCs in the waste gas streams are destroyed using a thermal oxidizer.

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Kent S. Knaebel and Herbert E. Reinhold, Landfill Gas: From Rubbish to Resource, Adsorption Research, Inc., Dublin, OH 43016-1200, USA, Dec. 14, 2002, Adsorption 9:87-94, 2003, copyright 2003 Kluwer Academic Publishers, manufactured in the Netherlands, pp. 87-94.

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