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Simultaneous biodegradation kinetics of 1,4-dioxane and ethane

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Abstract

Biodegradation of 1,4-Dioxane at environmentally relevant concentrations usually requires the addition of a primary electron-donor substrate to sustain biomass growth. Ethane is a promising substrate, since it is available as a degradation product of 1,4-Dioxane’s common co-contaminants. This study reports kinetic parameters for ethane biodegradation and co-oxidations of ethane and 1,4-Dioxane. Based on experiments combined with mathematical modeling, we found that ethane promoted 1,4-Dioxane biodegradation when the initial mass ratio of ethane:1,4-Dioxane was < 9:1 mg COD/mg COD, while it inhibited 1,4-Dioxane degradation when the ratio was > 9:1. A model-independent estimator was used for kinetic-parameter estimation, and all parameter values for 1,4-Dioxane were consistent with literature-reported ranges. Estimated parameters support competitive inhibition between ethane as the primary substrate and 1,4-Dioxane as the secondary substrate. The results also support that bacteria that co-oxidize ethane and 1,4-Dioxane had a competitive advantage over bacteria that can use only one of the two substrates. The minimum concentration of ethane to sustain ethane-oxidizing bacteria and ethane and 1,4-Dioxane-co-oxidizing bacteria was 0.09 mg COD/L, which is approximately 20-fold lower than the minimum concentration reported for propane, another common substrate used to promote 1,4-Dioxane biodegradation. The minimum 1,4-Dioxane concentration required to sustain steady-state biomass with 1,4-Dioxane as the sole primary substrate was 1.3 mg COD/L. As 1,4-Dioxane concentrations at most groundwater sites are less than 0.18 mg COD/L, providing ethane as a primary substrate is vital to support biomass growth and consequently enable 1,4-Dioxane bioremediation.

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Acknowledgements

This work was supported by the U.S. Department of Defense (DOD), the Strategic Environmental Research and Development Program (SERDP), through Project ER-2721.

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All authors contributed to the study conceptualization and methodology. Data collection and investigation were performed by YHL. Data analysis, modeling, and preparation of the first draft of the manuscript were carried out by EGT. All authors reviewed and edited the previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Youneng Tang.

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The authors declare no competing interests.

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Tesfamariam, E.G., Luo, YH., Zhou, C. et al. Simultaneous biodegradation kinetics of 1,4-dioxane and ethane. Biodegradation (2023). https://doi.org/10.1007/s10532-023-10058-x

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  • DOI: https://doi.org/10.1007/s10532-023-10058-x

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