title: Simultaneous application of chemical oxidation and extraction processes is effective at remediating soil Co-contaminated with petroleum and heavy metals.
abstract: Chemical extraction and oxidation processes to clean up heavy metals and hydrocarbon from soil have a higher remediation efficiency and take less time than other remediation processes. In batch extraction/oxidation process, 3% hydrogen peroxide (H2O2) and 0.1 M ethylenediaminetetraacetic acid (EDTA) could remove approximately 70% of the petroleum and 60% of the Cu and Pb in the soil, respectively. In particular, petroleum was effectively oxidized by H2O2without addition of any catalysts through dissolution of Fe oxides in natural soils. Furthermore, heavy metals bound to Fe-Mn oxyhydroxides could be extracted by metal-EDTA as well as Fe-EDTA complexation due to the high affinity of EDTA for metals. However, the strong binding of Fe-EDTA inhibited the oxidation of petroleum in the extraction-oxidation sequential process because Fe was removed during the extraction process with EDTA. The oxidation-extraction sequential process did not significantly enhance the extraction of heavy metals from soil, because a small portion of heavy metals remained bound to organic matter. Overall, simultaneous application of oxidation and extraction processes resulted in highly efficient removal of both contaminants; this approach can be used to remove co-contaminants from soil in a short amount of time at a reasonable cost.
authors.affiliation: Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea. Electronic address: ppoppo302@gmail.com.
authors.forename: Jong-Chan
authors.initials: JC
authors.lastname: Yoo
authors.affiliation: Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea. Electronic address: diquartz@gmail.com.
authors.forename: Chadol
authors.initials: C
authors.lastname: Lee
authors.affiliation: Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Department of Soil & Groundwater, Korea Environment Corporation, 42 Hwangyeong-ro, Seo-gu, Incheon, Republic of Korea. Electronic address: emcsun@keco.or.kr.
authors.forename: Jeung-Sun
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Department of Bioactive Material Science, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea. Electronic address: kbaek@jbnu.ac.kr.
authors.forename: Kitae
authors.initials: K
authors.lastname: Baek
mesh_terms: D005591:Chemical Fractionation; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005290:Ferric Compounds; D006861:Hydrogen Peroxide / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010578:Petroleum; D056910:Republic of Korea; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D005290:Ferric Compounds; D019216:Metals, Heavy; D010578:Petroleum; D012989:Soil Pollutants; D003300:Copper; C092844:ferric oxyhydroxide; D004492:Edetic Acid; D006861:Hydrogen Peroxide
keywords: Chemical extraction; Chemical oxidation; Heavy metals; Soil remediation; TPH