B
I
O
G
A
S
U
P
G
R
A
D
T
I
O
N
T
E
C
H
N
O
L
O
G
Y
M
E
T
H
O
D
S
Absorption methods
Physical Absorption
Physical Water Scrubbing
Organic Physical Scrubbing
Chemical Absorption
Amine Scrubbing
Adsorption methods
Pressure Swing Adsorption
Temperature Swing Adsorption
Vacuum Swing Adsorption
Membrane Separation Methods
Polymeric Membrane Separation
Inorganic Membrane Separation
Mixed Matrix Membrane Separation
Biological Methods
Chemoautotrophic Method
Insitu Chemoautotrophic Method
Exsitu Chemoautotrophic Method
Photoautotrophic method
Microbial Communities
Fermentation Method
Microbial Electrochemical Method
Algal Bacterial Photobioreactor
Cryogenic
Technology
Chemical
Dehydrogenation
Method
Insitu Methane
Enrichment
Industrial Lung
Supersonic
Separation
Hybrid method
Cryogenic
Technology &
Polymeric
Membrane
Separation
Method
Cryogenic
Technology &
Pressure Swing
Adsorption
Fig. 9.3 Various methods of biogas upgradation technologies
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B. S. Dhanya et al.