Chemical Degradation of Chlorinated Organic Pollutants for In Situ Remediation and Evaluation of Natural Attenuation

Hara, Junko

doi:10.5772/31775

Cited by 6 publications

(2 citation statements)

References 65 publications

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“…Methods that have been proposed to remove TCE from groundwater include microbial degradation [3–5], photochemical oxidation [6,7], sonochemical processes [8–10], and chemical reduction via zero-valent iron (ZVI) [12–15] or palladium-based materials [16–22]. Microbial processes suffer from long reaction time and limiting effects.…”

Section: Introductionmentioning

confidence: 99%

Impact of electrode sequence on electrochemical removal of trichloroethylene from aqueous solution

Rajić

Fallahpour

2015

Applied Catalysis B: Environmental

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The electrode sequence in a mixed flow-through electrochemical cell is evaluated to improve the hydrodechlorination (HDC) of trichloroethylene (TCE) in aqueous solutions. In a mixed (undivided) electrochemical cell, oxygen generated at the anode competes with the transformation of target contaminants at the cathode. In this study, we evaluate the effect of placing the anode downstream from the cathode and using multiple electrodes to promote TCE reduction. Experiments with a cathode followed by an anode (C→A) and an anode followed by a cathode (A→C) were conducted using mixed metal oxide (MMO) and iron as electrode materials. The TCE removal rates when the anode is placed downstream of the cathode (C→A) were 54% by MMO→MMO, 64% by MMO→Fe and 87% by Fe→MMO sequence. Removal rates when the anode is placed upstream of the cathode (A→C) were 38% by MMO→MMO, 58% by Fe→MMO and 69% by MMO→Fe sequence. Placing the anode downstream of the cathode positively improves (by 26%) the degradation of aqueous TCE in a mixed flow-through cell as it minimizes the influence of oxygen generated at the MMO anode on TCE reduction at the cathode. Furthermore, placing the MMO anode downstream of the cathode neutralizes pH and redox potential of the treated solution. Higher flow velocity under the C→A setup increases TCE mass flux reduction rate. Using multiple cathodes and an iron foam cathode up stream of the anode increase the removal rate by 1.6 and 2.4 times, respectively. More than 99% of TCE was removed in the presence of Pd catalyst on carbon and as an iron foam coating. Enhanced reaction rates found in this study imply that a mixed flow-through electrochemical cell with multiple cathodes up stream of an anode is an effective method to promote the reduction of TCE in groundwater.

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Section: Introductionmentioning

confidence: 99%

Impact of electrode sequence on electrochemical removal of trichloroethylene from aqueous solution

Rajić

Fallahpour

2015

Applied Catalysis B: Environmental

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“…These toxic materials are regulated globally, but their proliferations as well as their diffusion and degradation processes have not been studied to date. Our previous research made clear that natural iron sulfide was able to decompose chlorinated organic materials by oxidative reaction processes [1], [2]. Metal sulfides have vastly differing electrical and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Natural Degradation of Persistent Organic Chemicals in Acid Sulfate Soils Distributed in a Coastal Area

Hara¹,

Sakamoto²,

Kawabe³

2016

IJESD

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Coastal acid sulfate soils are naturally generated sediments, mainly containing iron sulfides. This study investigated the natural distribution of acid sulfate soils at the mouth of a river, and their remediation ability of persistent organic chemicals. These soils were distributed on a small scale in southern Japan; Iriomote Island was used as the study site. Coastal acid sulfate soils were found to be restricted to the surface in the downstream portions but distribution depth increased upstream. The shallow, surficial portion of acid sulfate soils in upstream areas had already oxidized and leached sulfuric acid. The degradation ability of sampled acid sulfate soils for dieldrin was confirmed in laboratory experiments and the degradation ability was found to increase with iron sulfide content. These reactions were controlled by the chemical reactivity of iron sulfides in natural systems but independent of microbial activity.

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Field Study V: Combined Oxidation Technology Using Ferrates (FeIV–VI) and Hydrogen Peroxide for Rapid and Effective Remediation of Contaminated Water—Comprehensive Practically Focused Study

Lacina

Hegedüs

2020

Applied Environmental Science and Engineering for a Sustainable Future

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Chemical Degradation of Chlorinated Organic Pollutants for In Situ Remediation and Evaluation of Natural Attenuation

Cited by 6 publications

References 65 publications

Impact of electrode sequence on electrochemical removal of trichloroethylene from aqueous solution

Impact of electrode sequence on electrochemical removal of trichloroethylene from aqueous solution

Evaluation of Natural Degradation of Persistent Organic Chemicals in Acid Sulfate Soils Distributed in a Coastal Area

Field Study V: Combined Oxidation Technology Using Ferrates (FeIV–VI) and Hydrogen Peroxide for Rapid and Effective Remediation of Contaminated Water—Comprehensive Practically Focused Study

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