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Biogas upgrading, economy and utilization: a review

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Abstract

Biogas production is rising in the context of fossil fuel decline and the future circular economy, yet raw biogas requires purification steps before use. Here, we review biogas upgrading using physical, chemical and biological methods such as water scrubbing, physical absorption, pressure swing adsorption, cryogenic separation, membrane separation, chemical scrubbing, chemoautotrophic methods, photosynthetic upgrading and desorption. We also discuss their techno-economic feasibility. We found that physical and chemical upgrading technologies are near-optimal, but still require high energy and resources. Biological methods are less explored despite their promising potential. High-pressure water scrubbing is more economic for small-sized plants, whereas potassium carbonate scrubbing provides the maximum net value for large-sized plants.

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source is injected

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source of heat, power and fuel by using appropriate upgradation technologies

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Abbreviations

BPFR:

Biofilm plug flow reactor

BCR:

Bubble column reactor

CaCO3 :

Calcium carbonate

CNG:

Compressed natural gas

Ca(OH)2 :

Calcium hydroxide

CO:

Carbon monoxide

CO2 :

Carbon dioxide

CH4 :

Methane

FBR:

Fixed bed reactor

GHG:

Greenhouse gas

GRT:

Gas retention time

HCO3 :

Bicarbonate

HPWS:

High-pressure water scrubbing

H2S:

Hydrogen sulphide

H2O:

Water

LBG:

Liquefied biogas

LBM:

Liquefied biomethane

LNG:

Liquid natural gas

Mg(OH)2 :

Magnesium hydroxide

NaOH:

Sodium hydroxide

N2 :

Nitrogen

NH3 :

Ammonia

PSA:

Pressure swing adsorption

TBR:

Trickle-bed reactor

UFR:

Up-flow reactor

VOC:

Volatile organic compound

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Correspondence to Shams Forruque Ahmed or P. Senthil Kumar.

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Ahmed, S.F., Mofijur, M., Tarannum, K. et al. Biogas upgrading, economy and utilization: a review. Environ Chem Lett 19, 4137–4164 (2021). https://doi.org/10.1007/s10311-021-01292-x

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  • DOI: https://doi.org/10.1007/s10311-021-01292-x

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