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Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
Published on: January 7, 2019
Selective microbial aerosolization in biogas demonstrated by quantitative PCR
Marina Moletta-Denat1, Valérie Bru-Adan, Jean-Philippe Delgenes
1INRA, UR50, Laboratoire de Biotechnologie de l'Environnement, Narbonne, France. marina.moletta@cstb.fr
Bioresource Technology
|May 25, 2010
Summary
Selective aerosolization of microorganisms in anaerobic digesters was observed. Opportunistic pathogens like Staphylococcus and Propionibacterium acnes are more frequently aerosolized, necessitating safety considerations for biogas upgrading.
Area of Science:
- Environmental microbiology
- Anaerobic digestion technology
- Microbial ecology
Background:
- Anaerobic digesters treat organic waste, producing biogas.
- Microbial communities in digesters can be aerosolized.
- Understanding microbial aerosolization is crucial for safety and process optimization.
Purpose of the Study:
- To investigate the in situ aerosolization of specific microbial groups from anaerobic digesters.
- To quantify the differential aerosolization rates of Bacteria, Archaea, Synergistes, Staphylococcus spp., and Propionibacterium acnes.
- To assess the implications of selective aerosolization for biogas upgrading.
Main Methods:
- Quantitative real-time PCR (qPCR) was used to analyze DNA from sludge and biogas samples.
- Microbial DNA was isolated from anaerobic digester sludge and biogas.
- Specific microbial groups were quantified using targeted primers.
Main Results:
- Staphylococcus spp. and Propionibacterium acnes showed significantly higher aerosolization rates (30x and 220x, respectively) compared to Bacteria.
- Archaea and Synergistes exhibited lower aerosolization rates (8x and 20x less, respectively) than Bacteria.
- This study provides the first evidence of selective microbial aerosolization in anaerobic digesters.
Conclusions:
- Microbial aerosolization in anaerobic digesters is selective, with opportunistic pathogens being more prone to airborne dissemination.
- The findings highlight the need for safety protocols during biogas upgrading into natural gas networks.
- Airborne dissemination potential of specific microbial groups must be considered in risk assessments for anaerobic digestion facilities.
