Impact of temperature, microwave radiation and organic loading rate on methanogenic community and biogas production during fermentation of dairy wastewater.

Bioresource technology · 2013 · Benefit · Low evidence

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BenefitLow evidencePaper 6518

Study snapshot

PublicationBioresource technology · 2013

Study typeother

Reported directionBenefit

Evidence ratingLow

Abstract

This study analyzed dairy wastewater fermentation in convection- and microwave-heated hybrid reactors at loadings of 1 and 2 kg COD/(m3 d) and temperatures of 35 and 55 °C. The biomass was investigated at a molecular level to determine the links between the operational parameters of anaerobic digestion and methanogenic Archaea structure. The highest production of biogas with methane content of ca. 67% was noted in the mesophilic microwave-heated reactors. The production of methane-rich biogas and the overall diversity of Archaea was determined by Methanosarcinaceae presence. The temperature and the application of microwaves were the main factors explaining the variations in the methanogen community. At 35 °C, the microwave heating stimulated the growth of highly diverse methanogen assemblages, promoting Methanosarcina barkeri presence and excluding Methanosarcina harudinacea from the biomass. A temperature increase to 55 °C lowered Methanosarcinaceae abundance and induced a replacement of Methanoculleus palmolei by Methanosarcina thermophila.

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 directionbenefit

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Dairy wastewater fermentation in microwave-heated reactors at 35 b0C produced the highest biogas with ~67% methane. Temperature and microwave application were reported as the main factors explaining variation in the methanogen community; at 35 b0C microwave heating stimulated a highly diverse methanogen assemblage and altered Methanosarcina species presence, while at 55 b0C Methanosarcinaceae abundance decreased with shifts in dominant taxa.

Outcomes measured

biogas production
methane content
methanogenic Archaea community structure/diversity
Methanosarcinaceae abundance/presence (e.g., Methanosarcina barkeri, Methanosarcina harudinacea, Methanosarcina thermophila)
Methanoculleus palmolei replacement

Limitations

Microwave exposure parameters (e.g., frequency, power, SAR) not reported in the abstract.
Sample size/number of reactors and statistical methods not reported in the abstract.
Findings are from an anaerobic digestion/bioprocess system rather than human or animal health outcomes.

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "microwave",
    "source": "microwave-heated hybrid reactors",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "biogas production",
    "methane content",
    "methanogenic Archaea community structure/diversity",
    "Methanosarcinaceae abundance/presence (e.g., Methanosarcina barkeri, Methanosarcina harudinacea, Methanosarcina thermophila)",
    "Methanoculleus palmolei replacement"
  ],
  "main_findings": "Dairy wastewater fermentation in microwave-heated reactors at 35\n\u0000b0C produced the highest biogas with ~67% methane. Temperature and microwave application were reported as the main factors explaining variation in the methanogen community; at 35\n\u0000b0C microwave heating stimulated a highly diverse methanogen assemblage and altered Methanosarcina species presence, while at 55\n\u0000b0C Methanosarcinaceae abundance decreased with shifts in dominant taxa.",
  "effect_direction": "benefit",
  "limitations": [
    "Microwave exposure parameters (e.g., frequency, power, SAR) not reported in the abstract.",
    "Sample size/number of reactors and statistical methods not reported in the abstract.",
    "Findings are from an anaerobic digestion/bioprocess system rather than human or animal health outcomes."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave heating",
    "anaerobic digestion",
    "dairy wastewater",
    "biogas",
    "methane",
    "methanogenic archaea",
    "Methanosarcinaceae",
    "temperature",
    "organic loading rate"
  ],
  "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: 10.1016/j.biortech.2012.11.093
PubMed: 23262005

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