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Hydrocarbon Toxicity towards Hydrogenotrophic Methanogens in Oily Waste Streams

Author

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  • Bruno P. Morais

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
    Current affiliation: Department of Chemistry, CICECO—Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.)

  • Valdo Martins

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

  • Gilberto Martins

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

  • Ana Rita Castro

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

  • Maria Madalena Alves

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

  • Maria Alcina Pereira

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

  • Ana J. Cavaleiro

    (CEB—Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal)

Abstract

Hydrocarbon-containing wastes and wastewaters are produced worldwide by the activities of the oil and gas industry. Anaerobic digestion has the potential to treat these waste streams, while recovering part of its energy potential as biogas. However, hydrocarbons are toxic compounds that may inhibit the microbial processes, and particularly the methanogens. In this work, the toxicity of hexadecane (0–30 mM) towards pure cultures of hydrogenotrophic methanogens ( Methanobacterium formicicum and Methanospirillum hungatei ) was assessed. Significantly lower ( p < 0.05) methane production rates were only verified in the incubations with more than 15 mM hexadecane and represented up to 52% and 27% inhibition for M. formicicum and M. hungatei , respectively. The results obtained point out that 50% inhibition of the methanogenic activity would likely occur at hexadecane concentrations between 5–15 mM and >30 mM for M. formicicum and M. hungatei , respectively, suggesting that toxic effects from aliphatic hydrocarbons towards hydrogenotrophic methanogens may not occur during anaerobic treatment. Hydrocarbon toxicity towards hydrogenotrophic methanogens was further assessed by incubating an anaerobic sludge with H 2 /CO 2 in the presence of a complex mixture of hydrocarbons (provided by the addition of an oily sludge from a groundwater treatment system). Specific methanogenic activity from H 2 /CO 2 decreased 1.2 times in the presence of the hydrocarbons, but a relatively high methane production (~30 mM) was still obtained in the assays containing the inoculum and the oily sludge (without H 2 /CO 2 ), reinforcing the potential of anaerobic treatment systems for methane production from oily waste/wastewater.

Suggested Citation

  • Bruno P. Morais & Valdo Martins & Gilberto Martins & Ana Rita Castro & Maria Madalena Alves & Maria Alcina Pereira & Ana J. Cavaleiro, 2021. "Hydrocarbon Toxicity towards Hydrogenotrophic Methanogens in Oily Waste Streams," Energies, MDPI, vol. 14(16), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4830-:d:610483
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    References listed on IDEAS

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    1. Karsten Zengler & Hans H. Richnow & Ramon Rosselló-Mora & Walter Michaelis & Friedrich Widdel, 1999. "Methane formation from long-chain alkanes by anaerobic microorganisms," Nature, Nature, vol. 401(6750), pages 266-269, September.
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    Cited by:

    1. Nicolas Lusinier & Isabelle Seyssiecq & Cecilia Sambusiti & Matthieu Jacob & Nicolas Lesage & Nicolas Roche, 2021. "Application of Moving Bed Biofilm Reactor and Fixed Bed Hybrid Biological Reactor for Oilfield Produced Water Treatment: Influence of Total Dissolved Solids Concentration," Energies, MDPI, vol. 14(21), pages 1-20, November.

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