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Assessment of temperature dynamics during methane oxidation in a pilot scale compost biofilter
Tania L Gómez-Borraz1, Yuly Vanessa Torres-Arévalo1, Yovany Cuetero-Martínez1
1Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar, Ciudad Universitaria, C.P. 04510 Ciudad de México, México.
Bioresource Technology
|January 22, 2025
Summary
Biological methane oxidation in compost biofilters generates heat. High temperatures (above 50°C) reduce methane removal efficiency and favor thermotolerant microbes, necessitating optimized operating conditions for effective biofiltration.
Area of Science:
- Environmental microbiology
- Biotechnology
- Bioreactor engineering
Background:
- Biological methane oxidation is crucial for mitigating greenhouse gas emissions.
- Compost biofilters utilize microbial activity to remove methane from waste streams.
- High operating temperatures can impact the efficiency and microbial ecology of biofilters.
Purpose of the Study:
- To investigate temperature dynamics during methane biofiltration.
- To assess methane removal efficiency under varying methane concentrations.
- To understand microbial community shifts in response to thermal stress.
Main Methods:
- Pilot-scale compost biofilter experiments.
- Controlled methane concentrations (2%, 4%, 8% v/v in air).
- Measurement of temperature, methane removal, and microbial community analysis.
Main Results:
- Complete methane removal at 2% methane, with temperatures reaching 51°C.
- Reduced efficiency at 4% (97%) and 8% (75%) methane due to temperatures exceeding 60°C.
- Dominance of thermotolerant Methylocaldum and shift towards catabolism at elevated temperatures.
Conclusions:
- Operating temperatures significantly influence methane biofiltration performance.
- Thermal stress affects microbial metabolism and community structure.
- Optimizing moisture and heat management is key for efficient biofiltration.
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