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Methane Elimination Using Biofiltration Packed With Fly Ash Ceramsite as Support Material.

Meng-Ting Sun1, Yu-Zhong Zhao2, Zhi-Man Yang2

  • 1College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao, China.

Frontiers in Bioengineering and Biotechnology
|May 12, 2020
PubMed
Summary

Fly ash ceramsite effectively immobilizes methane-oxidizing bacteria (MOB) for enhanced methane elimination. This eco-friendly biofiltration method significantly boosts methane removal capacity compared to suspended bacteria.

Keywords:
fly ash ceramsiteimmobilizationmethane biofiltrationmethane-oxidizing bacteriasurface property

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Microbiology

Background:

  • Methane is a potent greenhouse gas contributing to global warming.
  • Methane biofiltration using immobilized methane-oxidizing bacteria (MOB) offers an eco-friendly elimination strategy.
  • Optimizing support materials is crucial for high methane elimination capacity (EC).

Purpose of the Study:

  • To evaluate fly ash ceramsite (FAC) as a support material for immobilizing MOB.
  • To compare the methane elimination performance of immobilized MOB on FAC with suspended MOB.
  • To investigate the factors influencing MOB immobilization on FAC.

Main Methods:

  • Inoculation of MOB consortium in biofilters with 1% methane (v/v).
  • Measurement of methane elimination capacity (EC) in biofilters packed with FAC and suspended cultures.
  • Quantitative PCR (qPCR) to determine pmoA gene abundance for MOB biomass estimation.
  • X-ray Photoelectron Spectroscopy (XPS) and contact angle measurements to analyze FAC surface properties.

Main Results:

  • Biofilters packed with FAC demonstrated the highest average methane EC (4.628 g h⁻¹ m⁻³), 33.4% higher than suspended MOB.
  • FAC surface showed the highest pmoA gene abundance, indicating superior MOB immobilization.
  • FAC's surface elemental composition and hydrophilicity positively correlated with MOB immobilization.

Conclusions:

  • Fly ash ceramsite is an exceptional support material for immobilizing MOB in biofilters.
  • Immobilization on FAC significantly enhances methane elimination efficiency.
  • FAC's surface properties are key factors for effective MOB immobilization and improved methane removal.