Variation in properties of the sediment following electrokinetic treatments

Touch, Narong; Hibino, Tadashi; Nakashita, Shinya; Nakamoto, Kenji

doi:10.1080/09593330.2016.1190408

Cited by 10 publications

(9 citation statements)

References 28 publications

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“… 37 and Narong et al . 39 , energy consumption can also be determined according to equation ( 1 ): where P (kWh) is the energy consumption, V (V) is the voltage, I (A) is the current and t (hr) is the time. To determine the specific energy consumption, the above equation was divided by the total amount of the decontaminated soil.…”

Section: Resultsmentioning

confidence: 99%

Decontamination of Petroleum-Contaminated Soils Using The Electrochemical Technique: Remediation Degree and Energy Consumption

Streche

Cocârţă

Istrate

et al. 2018

Sci Rep

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Currently, there are different remediation technologies for contaminated soils, but the selection of the best technology must be not only the treatment efficiency but also the energy consumption (costs) during its application. This paper is focused on assessing energy consumption related to the electrochemical treatment of polluted soil with petroleum hydrocarbons. In the framework of a research project, two types of experiments were conducted using soil that was artificially contaminated with diesel fuel at the same level of contamination. The experimental conditions considered for each experiment were: different amounts of contaminated soils (6 kg and 18 kg, respectively), the same current intensity level (0.25A and 0.5A), three different contamination degrees (1%, 2.5% and 5%) and the same time for application of the electrochemical treatment. The remediation degree concerning the removal of petroleum hydrocarbons from soil increased over time by approximately 20% over 7 days. With regard to energy consumption, the results revealed that with an increase in the quantity of treated soil of approximately three times, the specific energy consumption decreased from 2.94 kWh/kg treated soil to 1.64 kWh/kg treated soil.

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Section: Resultsmentioning

confidence: 99%

Decontamination of Petroleum-Contaminated Soils Using The Electrochemical Technique: Remediation Degree and Energy Consumption

Streche

Cocârţă

Istrate

et al. 2018

Sci Rep

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“…This dissociation leads to the release of ferric ions in the sediment pore water [8] and changes in the ignition characteristics of the sediment [9]. Moreover, the enhancement of sediment remediation and enrichment of microorganisms in the sediment following electron recovery were confirmed [10]. This study aims to understand changes in organic matter characteristics of sediment when a solar cell-combined SMFC (SC-SMFC) is applied into the sediment.…”

Section: Introductionmentioning

confidence: 99%

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Touch¹,

Takata²,

Yamaji³

et al. 2018

IJESD

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Abstract-Metal ion or clay mineral-adsorbed organic matter present in littoral sediment is known as hardly decomposed organic matter, which is difficult to use as a natural resource. This study is aimed at changing the organic matter characteristics of littoral sediment through the application of solar cell-combined sediment microbial fuel cell (SC-SMFC). The experimental results showed that the sediment pH decreases and the concentration of metal ions in the sediment pore water increases after the application of SC-SMFC. This suggests the dissociation of metal complexes in the sediment. From the analysis results of organic matter characteristics, variations in the ignition characteristics of the sediment and the absorbance at wave number ranges of 3300-3800 and 800-1800 cm -1 were confirmed, indicating changes in organic matter characteristics of the sediment. It can be concluded that SC-SMFC can separate organic matter from metal complexes, leading to the transformation of organic matter in sediment from valueless into a useful product.

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“…This increases the sediment ORP, as following to the Nernst equation. More detailed information concerning the decreasing pH and increasing ORP in sediments by electricity generation can be also found in the reports by Touch et al [10], Choi ta al. [15], and Sturm et al [16].…”

Section: Effective Distance Of the Anodementioning

confidence: 79%

“…As compared with our previous studies [9][10], one of the objectives of this study is to understand the current generation characteristics when a solar cell is combined with the SMFC system (SC-SMFC), and the effects of SC-SMFC on sediment remediation. Another objective is to evaluate the effective distance of anode on sediment remediation.…”

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confidence: 99%

“…For instance, an increase in sediment ORP was higher when the potentiostat-combined SMFC was applied, in comparison with SMFC alone. Touch et al [10] looked into changes of the sediment quality following electrokinetic treatments, and reported the characteristics of sediment remediation and the enrichment of microorganisms following electron recovery from the sediment.…”

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confidence: 99%

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Solar Cell-Combined Sediment Microbial Fuel Cell for Preserving Sediment and Water Environments

Touch¹,

Yamaji²,

Takata³

et al. 2017

IJEP

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Abstract-Sediment microbial fuel cell (SMFC), an electrochemistry technology, is expected to be an alternative method for improving both water and sediment environments. This study presents the development of a solar cell-combined SMFC system (SC-SMFC), and the improvement of sediment and water environments by SC-SMFC through laboratory experiments. The distributions of pH and redox potential (ORP) in sediment were formed, in which larger decreases in pH and increases in ORP were found near the anode after the SC-SMFC application. From the pH and ORP distributions, the sediment located between 0 mm and 150 mm from the anode was strongly influenced by the SC-SMFC application, which was around 2-fold higher than that influenced by the application of SMFC alone. Interestingly, the system application caused the dissociation of calcium and iron complexes. This dissociation increased the concentrations of calcium and ferric ions, leading to the fixation of phosphate in the sediment. Furthermore, different decomposition characteristics of organic matter were found in the sediments near and far from the anode. In addition, the quality of overlying water was also improved by the system application. For example, the dissolved oxygen concentration remained higher near the sediment surface. These findings validate the usefulness of SC-SMFC as an alternative method for improving both sediment and water environments concurrently.

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Variation in properties of the sediment following electrokinetic treatments

Cited by 10 publications

References 28 publications

Decontamination of Petroleum-Contaminated Soils Using The Electrochemical Technique: Remediation Degree and Energy Consumption

Decontamination of Petroleum-Contaminated Soils Using The Electrochemical Technique: Remediation Degree and Energy Consumption

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Solar Cell-Combined Sediment Microbial Fuel Cell for Preserving Sediment and Water Environments

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