Investigation of the impacts of ethyl lactate based Fenton treatment on soil quality for polycyclic aromatic hydrocarbons (PAHs)-contaminated soils

Gan, Suyin; Yap, Chiew Lin; Ng, Hoon Kiat; Venny,

doi:10.1016/j.jhazmat.2013.09.023

Cited by 21 publications

(20 citation statements)

References 52 publications

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“…Figure 6a showed the evolution of bound PAH residues oxidation over time in soil, i.e., k = 0.16 h −1 (R 2 = 0.78). The k value was lower than that reported in the previous study [33], this pointed to the absence of oxidizable matter (transition matter, soil organic matter, etc.) in soil.…”

Section: H 2 O 2 Decomposition and The Degradation Efficiency Of Citrcontrasting

confidence: 81%

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

et al. 2019

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The availability of bound residues of polycyclic aromatic hydrocarbons (PAHs), in reference to their parent compounds, can be enhanced by microbial activity and chemical reactions, which pose severe risks for the ecosystems encompassing contaminated soils. Considerable attention has been raised on how to remove these bound residues from PAH-contaminated soils. This paper provides a novel application of Fenton oxidation in the removal of bound residues of model PAHs, such as naphthalene (NAP), acenaphthene (ACP), fluorene (FLU) and anthracene (ANT), from naturally contaminated soils. The citric acid-enhanced Fenton treatment resulted in the degradation of bound PAH residues that followed pseudo-first-order kinetics, with rate constants within 4.22 × 10−2, 1.25 × 10−1 and 2.72 × 10−1 h−1 for NAP, FLU, and ANT, respectively. The reactivity of bound PAH residues showed a correlation with their ionization potential (IP) values. Moreover, the degradation rate of bound PAH residues was significantly correlated with H2O2-Fe2+ ratio (m/m) and H2O2 concentrations. The highest removal efficiencies of bound PAH residues was up to 89.5% with the treatment of chelating agent oxalic acid, which was demonstrated to be superior to other acids, such as citric acid and hydrochloric acid. This study provides valuable insight into the feasibility of citric acid-Fenton and oxalic acid-Fenton treatments in rehabilitating bound PAH residues in contaminated soils.

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Section: H 2 O 2 Decomposition and The Degradation Efficiency Of Citrcontrasting

confidence: 81%

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

et al. 2019

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“…PAHs have been recognized as a potential health risk due to their bioaccumulation and potential toxicity to humans and wildlife Rivas, 2006). Therefore, remediation of soil contaminated with PAHs has received great attention (Antizar-Ladislao et al, 2004;Gan, Yap, & Ng, 2013;Jonsson et al, 2007;López-Vizcaíno et al, 2012;Rivas, 2006). To remediate and restore functions of soil polluted by PAHs, effective technologies are necessary.…”

Section: Introductionmentioning

confidence: 99%

“…Over the last two decades, Fenton treatment has emerged as a promising remediation technology for PAHs-polluted soils (Gan, Lau, & Ng, 2009;Gan et al, 2013;Martens & Frankenberger, 1995;Rosas, Vicente, Santos, & Romero, 2013;Saxe, Allen, & Nicol, 2000;Venny, Gan, & Ng, 2012;Yap, Gan, & Ng, 2011). Fenton oxidation processes are environmentally clean technologies which depend on the formation of reactive and non-selective hydroxyl (·OH) radicals for oxidation (Diyáuddeen, Aziz, & Daud, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The generated ·OH radicals can aggressively react with virtually all organic compounds (Munter, 2001). However, there are many limitations in applying sole Fenton oxidation to remediate soils polluted with PAHs (Gan et al, 2013;Martens & Frankenberger, 1995;Rosas et al, 2013;Saxe et al, 2000;Yap et al, 2011). A major challenge in Fenton treatment of PAHs-contaminated soils is the limited mass transfer of PAHs from the sorbed phase into the aqueous phase due to their strong sorption and low aqueous solubility (Yap et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Application of surfactant Tween 80 to enhance Fenton oxidation of polycyclic aromatic hydrocarbons (PAHs) in soil pre-treated with Fenton reagents

Yang

Song

2017

Geology, Ecology, and Landscapes

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Successive Fenton oxidation (up to three times) was conducted to enhance the removal efficiency of nine USEPA priority PAHs in aged soil highly contaminated with PAHs. Results showed that PAHs concentrations decreased rapidly and the removal efficiency was relatively high during one-time Fenton oxidation. However, PAHs in soil exhibited a slow removal trend and decreased at an extremely slow rate during two-and three-times Fenton oxidation. Surfactant Tween 80 was used to increase the amount of PAHs available for hydroxyl radical (·OH) and enhance Fenton oxidation efficiency of PAHs in aged soil pre-treated with Fenton reagents in this study.

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“…However, soil structure is not affected. The main impacts of chemical oxidants and free radicals, in addition to their inherent toxicity, are a loss of natural organic matter and sometimes a drop in pH [41,166,167]. This leads to a decrease in microbial community diversity and plant growth, but over several months biological activity starts again [168].…”

Section: Introductionmentioning

confidence: 99%