Method for biogas treatment
AssigneeClean Energy Fuels Corp.
InventorJeffrey J. Grill
Life of this patent
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Abstract
The present invention provides a method and apparatus for the treatment of process gas from an anaerobic digestion system or a landfill gas system. In one embodiment, the system comprises a caustic scrubber including a vertical column having a top and a bottom and including a counter current flow system, wherein a process gas stream flows up vertically through the column in counter current flow to a caustic liquid solution that flows downward through the column. The caustic liquid solution removes at least one acid from the process gas stream, wherein treated gas that is substantially free of acids bubbles out through an opening at the top of the vertical column
Claims18
A method of treating process gas from an anaerobic digestion system, comprising:
- receiving a process gas stream from the anaerobic digestion system;
- flowing the process gas stream upward through a vertical column;
- forming treated gas by flowing a caustic liquid solution downward through the vertical column such that substantially all acid is removed from the process gas;
- and
- bubbling treated gas out of an opening at the top of the vertical column, wherein the treated gas is substantially free of acid.
(canceled)
A method of treating process gas from a landfill gas system, comprising:
- receiving a process gas stream from the landfill gas system;
- flowing the process gas stream upward through a vertical column;
- forming treated gas by flowing a caustic liquid solution downward through the vertical column such that substantially all acid is removed from the process gas;
- and
- bubbling treated gas out of an opening at the top of the vertical column, wherein the treated gas is substantially free of acid.
(canceled)
(canceled)
Dependencies are inferred from the claim text.