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Atmospheric methane removal by methane-oxidizing bacteria immobilized on porous building materials |
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| Authors: | Giovanni Ganendra Willem De Muynck Adrian Ho Sven Hoefman Paul De Vos Pascal Boeckx Nico Boon |
| Affiliation: | 1. Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, 9000, Ghent, Belgium 2. SIM vzw, Technologiepark 935, 9052, Zwijnaarde, Belgium 3. Magnel Laboratory of Concrete Research, Ghent University, Technologiepark Zwijnaarde 904, 9052, Ghent, Belgium 4. Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB, Wageningen, The Netherlands 5. Laboratory of Microbiology, Ghent University, K.L. Ledeganckstraat 35, 9000, Gent, Belgium 6. BCCM/LMG Culture Collection, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium 7. Laboratory of Applied Physical Chemistry, ISOFYS, Ghent University, Coupure Links 653, 9000, Ghent, Belgium |
| Abstract: | Biological treatment using methane-oxidizing bacteria (MOB) immobilized on six porous carrier materials have been used to mitigate methane emission. Experiments were performed with different MOB inoculated in building materials at high (~20 % (v/v)) and low (~100 ppmv) methane mixing ratios. Methylocystis parvus in autoclaved aerated concrete (AAC) exhibited the highest methane removal rate at high (28.5?±?3.8 μg CH4 g?1 building material h?1) and low (1.7?±?0.4 μg CH4 g?1 building material h?1) methane mixing ratio. Due to the higher volume of pores with diameter >5 μm compared to other materials tested, AAC was able to adsorb more bacteria which might explain for the higher methane removal observed. The total methane and carbon dioxide-carbon in the headspace was decreased for 65.2?±?10.9 % when M. parvus in Ytong was incubated for 100 h. This study showed that immobilized MOB on building materials could be used to remove methane from the air and also act as carbon sink. |
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