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Landfill gas (LFG) processing via adsorption and alkanolamine absorption

Authors
Journal
Fuel Processing Technology
0378-3820
Publisher
Elsevier
Publication Date
Volume
91
Issue
6
Identifiers
DOI: 10.1016/j.fuproc.2010.01.010
Keywords
  • Landfill Gas
  • Carbon Dioxide
  • Methane
  • Absorption
  • Activated Carbon
  • Adsorption

Abstract

Abstract Landfill gas (LFG) was upgraded to pure methane using the adsorption and absorption processes. Different toxic compounds like aromatics and chlorinated compounds were removed using granular activated carbon. The activated carbon adsorbed toxic trace components in the following order: carbon tetrachloride > toluene > chloroform > xylene > ethylbenzene > benzene > trichloroethylene ≈ tetrachloroethylene. After removing all trace components, the gas was fed to absorption apparatus for the removal of carbon dioxide (CO 2). Two alkanolamines, monoethanol amine (MEA) and diethanol amine (DEA) were used for the removal of CO 2 from LFG. The maximum CO 2 loading is obtained for 30 wt.% MEA which is around 2.9 mol L − 1 of absorbent solution whereas for same concentration of DEA it is around 1.66 mol L − 1 of solution. 30 wt% MEA displayed a higher absorption rate of around 6.64 × 10 − 5 mol L − 1 min − 1 . DEA displayed a higher desorption rate and a better cyclic capacity as compared to MEA. Methane obtained from this process can be further used in the natural gas network for city.

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