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Effect of Endogenous Methane Production: A Step Forward in the Validation of Biochemical Methane Potential (BMP) Tests

Author

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  • João V. Oliveira

    (CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

  • José C. Costa

    (CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

  • Ana J. Cavaleiro

    (CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

  • Maria Alcina Pereira

    (CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

  • Maria Madalena Alves

    (CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

Abstract

This work evaluates the influence of the inoculum type, the pre-consumption of the residual substrate and the ratio of blanks’ headspace volume to working volume (Hv Wv −1 , 0.6 to 10) on Biochemical Methane Potential (BMP) measurements when methane is monitored by gas chromatography. Different inocula were tested: digested sewage sludge—DSS, granular sludge—GS and fresh dairy manure—DM. Microcrystalline cellulose was used as the substrate. BMP surpassed the maximum theoretical value (BMP max = 414 L kg −1 ) when methane produced in the blanks was not discounted, showing that degassing cannot stand alone as an alternative to the procedure of discounting the inoculum’s background production. Still, when the residual substrate concentration is high (e.g., in DM), degassing is mandatory because methane produced from its digestion will conceal the methane produced from the substrate in the BMP determination. For inocula with a low residual substrate (e.g., GS), short degassing periods are recommended in order to avoid detrimental effects on methanogenic activity. For moderate residual substrate concentrations (e.g., DSS), BMP values closer to BMP max (90–97%) were achieved after degassing and discounting the blanks with lower Hv Wv −1 . For higher Hv ∙ Wv −1 , less accurate quantification occurred, likely due to error propagation. Proper inoculum pre-incubation time and discounting the methane production from blanks with low Hv Wv −1 (adjusted according to the estimated background methane) are essential for accurate BMP determinations.

Suggested Citation

  • João V. Oliveira & José C. Costa & Ana J. Cavaleiro & Maria Alcina Pereira & Maria Madalena Alves, 2022. "Effect of Endogenous Methane Production: A Step Forward in the Validation of Biochemical Methane Potential (BMP) Tests," Energies, MDPI, vol. 15(13), pages 1-16, June.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4696-:d:848588
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    References listed on IDEAS

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    1. Costa, J.C. & Oliveira, J.V. & Alves, M.M., 2016. "Response surface design to study the influence of inoculum, particle size and inoculum to substrate ratio on the methane production from Ulex sp," Renewable Energy, Elsevier, vol. 96(PB), pages 1071-1077.
    2. Jongkwan Park & Kyung Hwa Cho & Mayzonee Ligaray & Mi-Jin Choi, 2019. "Organic Matter Composition of Manure and Its Potential Impact on Plant Growth," Sustainability, MDPI, vol. 11(8), pages 1-12, April.
    3. Raposo, F. & Borja, R. & Ibelli-Bianco, C., 2020. "Predictive regression models for biochemical methane potential tests of biomass samples: Pitfalls and challenges of laboratory measurements," Renewable and Sustainable Energy Reviews, Elsevier, vol. 127(C).
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    1. Wioleta Mikucka & Magdalena Zielinska, 2022. "Individual Phenolic Acids in Distillery Stillage Inhibit Its Biomethanization," Energies, MDPI, vol. 15(15), pages 1-18, July.

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