Environmental Investigation and Remediation

Mohr, Thomas; DiGuiseppi, William H.; Anderson, Janet K.; Hatton, James W.; Bishop, Jeremy; Selcoe, Barrie; Kappleman, William B.

doi:10.1201/9780429401428

Cited by 15 publications

(10 citation statements)

References 0 publications

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“…Recent studies have explored bioaugmented phytoremediation to enhance the treatment of xenobiotic compounds, including explosives, PCBs, chlorinated solvents, hydrocarbons, pesticides, and heavy metals. , Building on our previous work, , our recent efforts have focused on optimizing bioaugmentation of the poplar microbiome to treat 1,4-dioxane contamination. Because 1,4-dioxane was used as a stabilizer for chlorinated solvents, it is often found comingled with TCE, cis -DCE, TCA, and DCA . At some sites, the 1,4-dioxane plumes can reach for miles, possibly threatening the drinking water of nearby communities.…”

Section: Bioaugmentation and Growth Factorsmentioning

confidence: 99%

“…Because 1,4-dioxane was used as a stabilizer for chlorinated solvents, it is often found comingled with TCE, cis -DCE, TCA, and DCA. 56 At some sites, the 1,4-dioxane plumes can reach for miles, possibly threatening the drinking water of nearby communities. Phytoremediation is well suited for these large and dilute plumes, where traditional remedial techniques are often prohibitively expensive.…”

Section: Bioaugmentation and Growth Factorsmentioning

confidence: 99%

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Phytoremediation, Bioaugmentation, and the Plant Microbiome

Simmer

Schnoor

2022

Environ. Sci. Technol.

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Understanding plant biology and related microbial ecology as a means to phytoremediate soil and groundwater contamination has broadened and advanced the field of environmental engineering and science over the past 30 years. Using plants to transform and degrade xenobiotic organic pollutants delivers new methods for environmental restoration. Manipulations of the plant microbiome through bioaugmentation, endophytes, adding various growth factors, genetic modification, and/or selecting the microbial community via insertion of probiotics or phages for gene transfer are future areas of research to further expand this green, cost-effective, aesthetically pleasing technology�phytoremediation.

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Section: Bioaugmentation and Growth Factorsmentioning

confidence: 99%

Section: Bioaugmentation and Growth Factorsmentioning

confidence: 99%

Phytoremediation, Bioaugmentation, and the Plant Microbiome

Simmer

Schnoor

2022

Environ. Sci. Technol.

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“…It is a stable cyclic diether with symmetrical ether connections. A negative octanol-water partitioning coefficient and low carbon partitioning coefficient make leaching into the water from soil natural 23 . Recent studies show that over 30 million Americans consume water exceeding the health-based recommended threshold of 0.35 ppb 24 .…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations of water pollutant adsorption at parts-per-billion concentration: A study on 1,4-dioxane

Sharlin,

Lozano,

Josephson

2024

Preprint

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1,4-dioxane is an emerging water pollutant with high production volumes and a probable human carcinogen. The incompetence of conventional treatment processes demonstrates a need for an effective remediation strategy. Crystalline nanoporous materials are cost-effective adsorbents due to their high capacity and selective separation in mixtures. This study explores the potency of all-silica zeolites. These zeolites are highly hydrophobic and can preferentially adsorb nonpolar molecules from mixtures. We investigated six zeolite frameworks (BEA, EUO, FER, IFR, MFI, MOR) using Monte Carlo simulations in the Gibbs ensemble. The simulations indicate high selectivity by FER and EUO, especially at low pressures, which we attribute to pore sizes and shapes with more affinity to 1,4-dioxane. We also demonstrate a Monte Carlo simulation workflow using gauge cells to model the adsorption of an aqueous solution of 1,4-dioxane at 0.35 ppb concentration. We quantify 1,4-dioxane and water coadsorption and observe selectivities ranging from 1.1 x 10^5 in MOR to 8.7 x 10^6 in FER. We also demonstrate that 1,4-dioxane is in the infinite dilution regime in both the aqueous and adsorbed phases at this concentration. This simulation technique can be extended to model other emerging water contaminants such as per- and polyfluoroalkyl substances (PFAS), chlorates, and others, which are also found in extremely low concentrations.

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“…1,4-Dioxane (dioxane) is a probable human carcinogen and prevalent groundwater pollutant. , Because of its high mobility in water, dioxane plumes are often large and dilute (<100 μg/L). , On the basis of a one-in-one million cancer risk assessment, the US EPA has established a Health Reference Level (HRL) for dioxane of 0.35 μg/L . Treatment of dilute dioxane plumes to this low concentration presents a significant challenge and financial burden for many stakeholders.…”

Section: Introductionmentioning

confidence: 99%

Rapid Metabolism of 1,4-Dioxane to below Health Advisory Levels by Thiamine-Amended Rhodococcus ruber Strain 219

Simmer

Richards

Ewald

et al. 2021

Environ. Sci. Technol. Lett.

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Bioremediation is a promising treatment technology for 1,4-dioxane-contaminated groundwater. However, metabolic dioxane-degrading bacteria identified to date are limited by their slow kinetics and inability to sustain growth at low dioxane concentrations (<100 μg/L). Furthermore, strains may underperform because of missing growth factors, such as amino acids or vitamins. In this work, we reevaluate Rhodococcus ruber strain 219 as a dioxane-degrading strain with bioaugmentation potential. We report rapid growth and metabolic dioxane degradation by R. ruber 219 when supplemented with thiamine (vitamin B1). We also discern that the strain lacks a complete de novo thiamine synthesis pathway, indicating that R. ruber 219 is a probable thiamine auxotroph. However, when supplemented with thiamine, the strain’s Monod kinetics (K s = 0.015 ± 0.03 μg/L) and exceedingly low S min (0.49 ± 1.16 μg/L) suggest this strain can maintain growth at very low dioxane concentrations (<100 μg/L). Accordingly, we demonstrate that thiamine-grown R. ruber 219 sustains degradation of dilute dioxane (<100 μg/L) to below health advisory levels. This is the first study to report sustained metabolic dioxane biodegradation to below health advisory levels of 0.35 μg/L. Overall, our findings solidify R. ruber 219 as a promising candidate for bioremediation of dioxane-contaminated groundwater.

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Environmental Investigation and Remediation

Cited by 15 publications

References 0 publications

Phytoremediation, Bioaugmentation, and the Plant Microbiome

Phytoremediation, Bioaugmentation, and the Plant Microbiome

Monte Carlo simulations of water pollutant adsorption at parts-per-billion concentration: A study on 1,4-dioxane

Rapid Metabolism of 1,4-Dioxane to below Health Advisory Levels by Thiamine-Amended Rhodococcus ruber Strain 219

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