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Bioaugmenting the poplar rhizosphere to enhance treatment of 1,4-dioxane.

Identifieur interne : 000544 ( Main/Exploration ); précédent : 000543; suivant : 000545

Bioaugmenting the poplar rhizosphere to enhance treatment of 1,4-dioxane.

Auteurs : Reid Simmer [États-Unis] ; Jacques Mathieu [États-Unis] ; Marcio L B. Da Silva [États-Unis] ; Philip Lashmit [États-Unis] ; Sridhar Gopishetty [États-Unis] ; Pedro J J. Alvarez [États-Unis] ; Jerald L. Schnoor [États-Unis]

Source :

RBID : pubmed:32721670

Descripteurs français

English descriptors

Abstract

1,4-Dioxane is a highly mobile and persistent groundwater pollutant that often forms large dilute plumes. Because of this, utilizing aggressive pump-and-treat and ex-situ technologies such as advanced oxidation can be prohibitively expensive. In this study, we bioaugmented the poplar rhizosphere with dioxane-degrading bacteria Mycobacterium dioxanotrophicus PH-06 or Pseudonocardia dioxanivorans CB1190 to enhance treatment of 1,4-dioxane in bench-scale experiments. All treatments tested removed 10 mg/L dioxane to near health advisory levels (<4 μg/L). However, PH-06-bioaugmented poplar significantly outperformed all other treatments, reaching <4 μg/L in only 13 days. Growth curve experiments confirmed that PH-06 could not utilize root extract as an auxiliary carbon source for growth. Despite this limitation, our findings suggest that PH-06 is a strong bioaugmentation candidate to enhance the treatment of dioxane by phytoremediation. In addition, we confirmed that CB1190 could utilize both 1,4-dioxane and root extract as substrates. Finally, we demonstrated the large-scale production of these two strains for use in the field. Overall, this study shows that combining phytoremediation and bioaugmentation is an attractive strategy to treat dioxane-contaminated groundwater to low risk-based concentrations (~1 μg/L).

DOI: 10.1016/j.scitotenv.2020.140823
PubMed: 32721670


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">1,4-Dioxane is a highly mobile and persistent groundwater pollutant that often forms large dilute plumes. Because of this, utilizing aggressive pump-and-treat and ex-situ technologies such as advanced oxidation can be prohibitively expensive. In this study, we bioaugmented the poplar rhizosphere with dioxane-degrading bacteria Mycobacterium dioxanotrophicus PH-06 or Pseudonocardia dioxanivorans CB1190 to enhance treatment of 1,4-dioxane in bench-scale experiments. All treatments tested removed 10 mg/L dioxane to near health advisory levels (<4 μg/L). However, PH-06-bioaugmented poplar significantly outperformed all other treatments, reaching <4 μg/L in only 13 days. Growth curve experiments confirmed that PH-06 could not utilize root extract as an auxiliary carbon source for growth. Despite this limitation, our findings suggest that PH-06 is a strong bioaugmentation candidate to enhance the treatment of dioxane by phytoremediation. In addition, we confirmed that CB1190 could utilize both 1,4-dioxane and root extract as substrates. Finally, we demonstrated the large-scale production of these two strains for use in the field. Overall, this study shows that combining phytoremediation and bioaugmentation is an attractive strategy to treat dioxane-contaminated groundwater to low risk-based concentrations (~1 μg/L).</div>
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<CoiStatement>Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</CoiStatement>
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<name sortKey="Alvarez, Pedro J J" sort="Alvarez, Pedro J J" uniqKey="Alvarez P" first="Pedro J J" last="Alvarez">Pedro J J. Alvarez</name>
<name sortKey="Da Silva, Marcio L B" sort="Da Silva, Marcio L B" uniqKey="Da Silva M" first="Marcio L B" last="Da Silva">Marcio L B. Da Silva</name>
<name sortKey="Gopishetty, Sridhar" sort="Gopishetty, Sridhar" uniqKey="Gopishetty S" first="Sridhar" last="Gopishetty">Sridhar Gopishetty</name>
<name sortKey="Lashmit, Philip" sort="Lashmit, Philip" uniqKey="Lashmit P" first="Philip" last="Lashmit">Philip Lashmit</name>
<name sortKey="Mathieu, Jacques" sort="Mathieu, Jacques" uniqKey="Mathieu J" first="Jacques" last="Mathieu">Jacques Mathieu</name>
<name sortKey="Schnoor, Jerald L" sort="Schnoor, Jerald L" uniqKey="Schnoor J" first="Jerald L" last="Schnoor">Jerald L. Schnoor</name>
</country>
</tree>
</affiliations>
</record>

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{{Explor lien
   |wiki=    Bois
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   |flux=    Main
   |étape=   Exploration
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   |clé=     pubmed:32721670
   |texte=   Bioaugmenting the poplar rhizosphere to enhance treatment of 1,4-dioxane.
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