4.8 Article

Improved methane removal in exhaust gas from biogas upgrading process using immobilized methane-oxidizing bacteria

Journal

BIORESOURCE TECHNOLOGY
Volume 256, Issue -, Pages 201-207

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.020

Keywords

Methane-oxidizing bacteria; Biofilter; Support material; Immobilization

Funding

  1. Key Research & Development Project of Shandong [2015GSF117016]
  2. Integrated and Industrialized Research of the Gasified Grain-based Residuals [2014BAC31B00]
  3. National Natural Science Foundation of China [41276143, 41773102]
  4. Key Technological Innovation Project of Shandong [2017CXGC0305]

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Methane in exhaust gas from biogas upgrading process, which is a greenhouse gas, could cause global warming. The biofilter with immobilized methane-oxidizing bacteria (MOB) is a promising approach for methane removal, and the selections of inoculated MOB culture and support material are vital for the biofilter. In this work, five MOB consortia were enriched at different methane concentrations. The MOB-20 consortium enriched at the methane concentration of 20.0% (v/v) was then immobilized on sponge and two particle sizes of volcanic rock in biofilters to remove methane in exhaust gas from biogas upgrading process. Results showed that the immobilized MOB performed more admirable methane removal capacity than suspended cells. The immobilized MOB on sponge reached the highest methane removal efficiency (RE) of 35%. The rough surface, preferable hydroscopicity, appropriate pore size and particle size of support material might favor the MOB immobilization and accordingly methane removal.

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