Biogas upgrading to biomethane - The Biogas: Science, Production and Applications - page 344

Table 15.1 Overview of key parameters of biogas upgrading technologies (Copyright: Fraunhofer IWES, 2012)

PSA Water

Scrubber

Physical
absorption
(organic
solvents)

Chemical
absorption
(organic
solvents)

Membrane
(high
pressure,
dry)

Cryogenic Sources

Electricity demand (kWh/m n 3 BG) 0.16-0.35 0.20-0.30 0.23-0.33 0.06-0.17 0.18-0.35 0.18-0.25 [9-15, 18, 19, 23]

Heat demand (kWh/m n 3 BG) 0 0 0.10-0.15 0.4-0.8 0 0 [14,17,19]

Temperature process
heat (in the column) (

— — 40-80 106-160 — — [11, 12, 20]

8 C)

Operation pressure (bar) 1-10 4-10 4-8 0.05-4 7-20 10-25 [7,10-13, 21, 22, 25]

Methane loss (%) 1.5-10 0.5-2 1-4 ~ 0.1 1-15 0.1-2.0 [11-13, 16, 17, 19, 21,

24, 26]

Methane recovery rate (%) 90-98.5 98-99.5 96-99 ~ 99.9 85-99 98-99.9 [11-13, 16, 17, 19, 21,

24, 26]

Off-gas treatment
recommended
(methane loss

Yes Yes Yes No Yes Yes

1%)

>

Precision desulphurization
required

Yes No No Yes

(Depending
on
manufacturer)

Recommended Yes

Water demand No Yes No Yes No No

Demand on chemical substances No No Yes Yes No No