Associating potential 1,4-dioxane biodegradation activity with groundwater geochemical parameters at four different contaminated sites

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:206

Article

da Silva, Marcio Luis Busi¹  Woroszylo, Casper²  Castillo, Nicolas Flores³  Adamson, David T.⁴  Alvarez, Pedro J. J.¹ 

[1] Rice Univ, Dept Civil & Environm Engn, Houston, TX 77005 USA

[2] Ohio State Univ, Columbus, OH 43210 USA

[3] Biarri, Brisbane, Qld 4000, Australia

[4] GSI Environm Inc, Houston, TX 77098 USA

关键词: Biodegradation;    Dioxane;    Groundwater;    Natural attenuation;   

DOI  :  10.1016/j.jenvman.2017.10.031

来源: Elsevier

【 摘 要 】

1,4-Dioxane (dioxane) is a groundwater contaminant of emerging concern for which bioremediation may become a practical remediation strategy. Therefore, it is important to advance our heuristic understanding of geochemical parameters that are most influential on the potential success of intrinsic bioremediation of dioxane-impacted sites. Here, Pearson's and Spearman's correlation and linear regression analyses were conducted to discern associations between 1,4-dioxane biodegradation activity measured in aerobic microcosms and groundwater geochemical parameters at four different contaminated sites. Dissolved oxygen, which is known to limit dioxane biodegradation, was excluded as a limiting factor in this analysis. Biodegradation activity was positively associated with dioxane concentrations (p < 0.01; R < 0.70) as well as the number of catabolic thmA gene copies (p < 0.01; R = 0.80) encoding dioxane monooxygenase. Thus, whereas environmental factors such as pH, temperature, and nutrients may influence dioxane biodegradation, these parameters did not exert as strong of an influence on potential biodegradation activity as the in situ concentration of substrate dioxane at the time of sampling. This analysis infers that aerobic sites with higher dioxane concentrations are more likely to select and sustain a thriving population of dioxane degraders, while sites with relatively low dioxane concentrations would be more difficult to attenuate naturally and may require alternative remediation strategies. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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