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Mechanism of Carbon Monoxide (CO) Generation and Potential Human Health Hazard during Mechanized Tunnel Driving in Organic-Rich Rocks: Field and Laboratory Study

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  • Andre Baldermann

    (Institute of Applied Geosciences, Graz University of Technology and NAWI Graz Geocenter, Rechbauerstraße 12, 8010 Graz, Austria)

  • Ronny Boch

    (Institute of Applied Geosciences, Graz University of Technology and NAWI Graz Geocenter, Rechbauerstraße 12, 8010 Graz, Austria
    Department of Geology, University of Vienna, Althanstraße 14, 1090 Vienna, Austria)

  • Volker Reinprecht

    (Institute of Applied Geosciences, Graz University of Technology and NAWI Graz Geocenter, Rechbauerstraße 12, 8010 Graz, Austria)

  • Claudia Baldermann

    (Institute of Technology and Testing of Building Materials (IMBT-TVFA), Graz University of Technology, Inffeldgasse 24, 8010 Graz, Austria)

Abstract

The monitoring of carbon emissions is increasingly becoming a sustainability issue worldwide. Despite being largely unnoticed, the toxic gas carbon monoxide (CO) is ubiquitous in mechanized tunnel driving, but the individual sources, release and enrichment mechanisms are often unknown. In this study, the generation of CO from organic matter containing sedimentary rocks was investigated during mechanized tunnel driving and by reacting claystone and sandstone with 10 mM NaCl solutions for 2 months at 70 °C and 140 °C. The mineralogical and geochemical evolution of the solids and fluids was assessed by CO measurements and the XRD, DTA, TOC, IC and ICP-OES methods. The CO concentration in the atmosphere reached up to 1920 ppm (100 ppm on average) during tunnel driving, which is more than three times higher than the legal daily average dose for tunnellers, thus requiring occupational safety operations. Mineral-specific dissolution processes and the rapid decomposition of labile organic matter upon thermal alteration contributed to the liberation of CO and also carbon dioxide (CO 2 ) from the host rocks. In mechanized tunnel driving, frictional heat and ‘cold’ combustion with temperatures reaching 50–70 °C at the drill head is an important mechanism for increased CO and CO 2 generation, especially during drilling in sedimentary rocks containing significant amounts of OM and when the ventilation of the tunnel atmosphere and air mixing are limited. Under such conditions, human health damage due to CO exposure (HHD CO ) can be 30 times higher compared to tunnel outlets, where CO is emitted from traffic.

Suggested Citation

  • Andre Baldermann & Ronny Boch & Volker Reinprecht & Claudia Baldermann, 2024. "Mechanism of Carbon Monoxide (CO) Generation and Potential Human Health Hazard during Mechanized Tunnel Driving in Organic-Rich Rocks: Field and Laboratory Study," Sustainability, MDPI, vol. 16(18), pages 1-17, September.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:18:p:8107-:d:1479529
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    References listed on IDEAS

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    1. Pierre Regnier & Laure Resplandy & Raymond G. Najjar & Philippe Ciais, 2022. "The land-to-ocean loops of the global carbon cycle," Nature, Nature, vol. 603(7901), pages 401-410, March.
    2. Dennis A. Hansell & Craig A. Carlson, 1998. "Deep-ocean gradients in the concentration of dissolved organic carbon," Nature, Nature, vol. 395(6699), pages 263-266, September.
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