NOVELTY - Landfill gas treatment and separation of methane gas and carbon dioxide gas, and production of natural gas, carbon dioxide, and regenerating carbon dioxide absorption material involves compressing a gas from a first separator and conducting it to an absorber having an absorbent.    USE - For landfill gas treatment and separation of methane gas and carbon dioxide gas, and for producing natural gas, carbon dioxide, and regenerating the carbon dioxide absorption material.    ADVANTAGE - The invented method is cost effective in recovering methane-rich fuel product and a highly pure carbon dioxide product from landfill gas.    DETAILED DESCRIPTION - Landfill gas treatment and separation of methane gas and carbon dioxide gas, and production of natural gas, carbon dioxide, and regenerating the carbon dioxide absorption material involves flowing landfill methane gas from wells to a collector; conducting the gas from the collector to a first separator and separating any heavier liquids and solids in the gas flowing into the first separator; compressing the gas from the first separator and conducting it to an absorber having an absorbent; mixing the gas and an absorbent to produce carbon dioxide saturated absorbent and purified methane gas containing little carbon dioxide; separating much of the carbon dioxide and methane gas from the carbon dioxide saturated absorbent in a second separator; removing any excess water vapor from the purified methane gas in one of two alternate dehumidifying absorbers with an adsorbent; regenerating the adsorbent in either of the two dehumidifying absorbers by supplying gas from the second separator; conducting the gas used to regenerate the adsorbent from the dehumidifying absorber to the first separator; switching between regenerating the adsorbent and dehumidifying the purified methane gas; and regenerating the carbon dioxide saturated absorbent. An INDEPENDENT CLAIM is also included for an apparatus for landfill gas treatment and separation of methane gas and carbon dioxide gas contained therein, and for producing natural gas, carbon dioxide, and regenerating the carbon dioxide absorption material.    DESCRIPTION OF DRAWING(S) - The figure is a diagram of a process for landfill gas treatment and separation of methane gas and carbon dioxide gas.    Change filter (20)    Electric valves (37a)    Pipe (39)    Detector (41)    Separator (S2)