Switching effects of electrode polarity and introduction direction of reagents in electrokinetic-Fenton process with anionic surfactant for remediating iron-rich soil contaminated with phenanthrene

Park, Joo Yang; Kim, Junghwan

doi:10.1016/j.electacta.2011.04.074

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…This indicated that alternating the polarity of the EK enhanced the ionic strength in the pore water. Proton (H + ) and hydroxyl ions (OH À ) produced by electrolysis can be neutralized and transformed back to water molecules by polarity reversing [29]. It indicated that EK-Bio-PR can maintain a higher electric current than EK-Bio.…”

Section: Electrical Currentmentioning

confidence: 95%

Effect of polarity-reversal on electrokinetic enhanced bioremediation of Pyrene contaminated soil

Li¹,

Wang²,

Guo

et al. 2016

Electrochimica Acta

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Section: Electrical Currentmentioning

confidence: 95%

Effect of polarity-reversal on electrokinetic enhanced bioremediation of Pyrene contaminated soil

Li¹,

Wang²,

Guo

et al. 2016

Electrochimica Acta

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“…The Electrokinetic-Fenton method has been studied extensively for the treatment of organic compounds, such as phenol (Yang and Long 1999;Kim et al 2005;Babuponnusami and Muthukumar 2012), chlorophenoxyl acid, aromatic herbicides (Aaron and Oturan 2001), phenanthrene (Kim et al 2005;Park et al 2005;Kim et al 2006;Reddy and Karri 2006;Kim et al 2007;Alcántara et al 2008;Kim et al 2009;Park and Kim 2011), hexanchlorobenzene (HCB) (Oonnittan et al 2008(Oonnittan et al , 2009(Oonnittan et al , 2010, diesel (Tsai et al 2010), H-acid/RB5 (Rao et al 2006), trichloroethane (Yang and Liu 2001) and PAHs (Isosaari et al 2007). A summary of the studies concerned with the Electrokinetic-Fenton process to remove organic compounds in soil is provided in Table 1.…”

Section: Applications Of Electrokinetic-fenton In Soil Treatment For mentioning

confidence: 99%

“…This causes higher soil pH and consequently decreases H 2 O 2 stability. Other than acids, the application of stabilizers, such as K 2 HPO 4 and SDS, are also found to increase H 2 O 2 stability (Kim et al 2007;Park and Kim 2011). This can occur via altering the availability of iron catalyst for Fenton reaction.…”

Section: Enhancement Of Electrokinetic-fenton Via Chemical Stabilizationmentioning

confidence: 99%

“…This can occur via altering the availability of iron catalyst for Fenton reaction. The work of Kim et al (2007) and Park and Kim (2011) show that the use of phosphate can complex with metal oxides in the soil to prevent an undesirable Fenton-like reaction from other metals. This additive is more suitable for high iron content soil so that H 2 O 2 decomposition could be slowed down.…”

Section: Enhancement Of Electrokinetic-fenton Via Chemical Stabilizationmentioning

confidence: 99%

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Stability and performance enhancements of Electrokinetic-Fenton soil remediation

Sengupta

Hashim

2014

Rev Environ Sci Biotechnol

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Electrokinetic process is a potential in situ soil remediation process which transports the contaminants via electromigration and electroosmosis. For organic compounds contaminated soil, Fenton's reagent is utilized as a flushing agent in electrokinetic process (Electrokinetic-Fenton) so that removal of organic contaminants could be achieved by in situ oxidation/destruction. However, this process is not applied widely in industries as the stability issue for Fenton's reagent is the main drawback. The aim of this mini review is to summarize the developments of Electrokinetic-Fenton process on enhancing the stability of Fenton's reagent and process efficiency in past decades. Generally, the enhancements are conducted via four paths: (1) chemical stabilization to delay H 2 O 2 decomposition, (2) increase of oxidant availability by monitoring injection method for Fenton's reagent, (3) electrodes operation and iron catalysts and (4) operating conditions such as voltage gradient, electrolytes and H 2 O 2 concentration. In addition, the types of soils and contaminants are also showing significant effect as the soil with low acid buffering capacity, adequate iron concentration, low organic matter content and low aromatic ring organic contaminants generally gives better efficiency. Keywords Electrokinetic-Fenton Á H 2 O 2 stability enhancement Á Chemical stabilization Á Oxidant delivery Á Electrodes operation and iron catalysts

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“…It is reported that EK has the potential to stimulate the bioremediation of pentachlorophenol pollutants by reversed field EK . Alternating the polarity of the electrical field and the direction of reagent introduction could regenerate electro‐osmotic flow, which has been shown to be effective for more homogeneous treatments of phenanthrene in soil samples . Polarity exchange has also been used as a simple method to avoid the negative effect of extreme pH on metal transportation .…”

Section: Introductionmentioning

confidence: 99%

Effect of polarity‐reversal and electrical intensity on the oil removal from soil

Guo

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: Although electro-bioremediation (EK-Bio) is effective at removing organic contaminants from soil, the role of electrical intensity (EI) and polarity-reversal (PR) remains unclear. Two electrokinetic reactors (ER I and II) with six treatments (EK-I, EK-PR-I, Bio-I, EK-Bio-I, EK-Bio-PR-I and EK-PR-II) were applied for 42 days to examine the effect of EI and PR on oil EK-Bio remediation. RESULTS: The final oil degradation rate in EK-Bio-PR-I was 27.8%, representing an increase of 18.4%, 11.3% and 7.6% compared with EK-I, Bio-I and EK-Bio-I, respectively. Soil pH remained at around 6.6, and the average bacterial counts increased from 7.66 to 8.41 log 10 cfu g -1 dry soil by the end of EK-Bio-PR-I. There was a significant positive linear correlation between EI and the oil degradation rate in EK-I (y = 0.6919x + 9.2278; Pearson correlation coefficient = 0.9887). The simulated oil degradation rate was assessed according to the above equation in an amplification experiment (EK-PR-II), and the observed oil degradation rate showed no significant difference with the simulated data (P > 0.05).CONCLUSION: EI and PR have positive effects on oil degradation efficiency and soil bacteria, indicating that EK-Bio with appropriate EI and periodic PR is the best approach for removing oil from soil.

show abstract

Switching effects of electrode polarity and introduction direction of reagents in electrokinetic-Fenton process with anionic surfactant for remediating iron-rich soil contaminated with phenanthrene

Cited by 16 publications

References 26 publications

Effect of polarity-reversal on electrokinetic enhanced bioremediation of Pyrene contaminated soil

Effect of polarity-reversal on electrokinetic enhanced bioremediation of Pyrene contaminated soil

Stability and performance enhancements of Electrokinetic-Fenton soil remediation

Effect of polarity‐reversal and electrical intensity on the oil removal from soil

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