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Microwave radiation and reactor design influence microbial communities during methane fermentation.

Journal of industrial microbiology & biotechnology · 2012 · Mixed · Low evidence

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MixedLow evidencePaper 6524

Microwave-heated trickling-bed reactors showed the best fermentation results and the highest abundance of methanogenic Archaea. In reactors of identical design, microwaves were associated with higher fermentation efficiency and increased diversity of methanog…

Study snapshot

PublicationJournal of industrial microbiology & biotechnology · 2012
Study typeother
Reported directionMixed
Evidence ratingLow

Abstract

The effect of reactor design and method of heating on the efficiency of methane fermentation and composition of microbial communities, especially methanogenic Archaea, were determined. The research was carried out using submerge- and trickling-bed reactors fed with wastewater and the heat supply into the reactors included a convection heating method and microwave radiation. The polymerase chain reaction-denaturing gradient gel electrophoresis and relative real-time PCR were used in order to assess the biofilm communities. The best fermentation results and the highest abundance of methanogenic Archaea in biomass were observed in microwave heated trickling-bed reactors. The research proved that in reactors of identical design, the application of microwaves enabled a higher fermentation efficiency to be obtained and simultaneously increased the diversity of methanogenic Archaea communities that favors process stability. All the identified sequences of Archaea belonged to Methanosarcina sp., suggesting that species from this genera are susceptible to non-thermal effects of microwaves. There were no effects from microwaves on the bacterial communities in both types of reactors, however, the bacterial species composition varied in the reactors of different design.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother
Effect directionmixed
PopulationMicrobial communities (methane fermentation biofilms; methanogenic Archaea and bacteria) in submerged- and trickling-bed reactors fed with wastewater
Sample sizeNot supplied
Exposuremicrowave
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Microwave-heated trickling-bed reactors showed the best fermentation results and the highest abundance of methanogenic Archaea. In reactors of identical design, microwaves were associated with higher fermentation efficiency and increased diversity of methanogenic Archaea communities; no effects of microwaves on bacterial communities were reported.

Outcomes measured

  • Methane fermentation efficiency
  • Abundance of methanogenic Archaea
  • Diversity/composition of methanogenic Archaea communities
  • Bacterial community effects/composition

Limitations

  • Frequency, power, and exposure metrics for microwave radiation were not reported in the abstract.
  • Sample size and replication details were not provided in the abstract.
  • Findings are specific to reactor systems and microbial communities; generalizability beyond this context is unclear from the abstract.
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": "microwave",
    "source": "reactor heating (microwave radiation)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Microbial communities (methane fermentation biofilms; methanogenic Archaea and bacteria) in submerged- and trickling-bed reactors fed with wastewater",
  "sample_size": null,
  "outcomes": [
    "Methane fermentation efficiency",
    "Abundance of methanogenic Archaea",
    "Diversity/composition of methanogenic Archaea communities",
    "Bacterial community effects/composition"
  ],
  "main_findings": "Microwave-heated trickling-bed reactors showed the best fermentation results and the highest abundance of methanogenic Archaea. In reactors of identical design, microwaves were associated with higher fermentation efficiency and increased diversity of methanogenic Archaea communities; no effects of microwaves on bacterial communities were reported.",
  "effect_direction": "mixed",
  "limitations": [
    "Frequency, power, and exposure metrics for microwave radiation were not reported in the abstract.",
    "Sample size and replication details were not provided in the abstract.",
    "Findings are specific to reactor systems and microbial communities; generalizability beyond this context is unclear from the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "methane fermentation",
    "reactor design",
    "trickling-bed reactor",
    "submerged reactor",
    "methanogenic Archaea",
    "Methanosarcina",
    "biofilm",
    "PCR-DGGE",
    "real-time PCR",
    "non-thermal effects"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1007/s10295-012-1141-x
PubMed: 22614452

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