Yoo Jong-Chan, Lee Chadol, Lee Jeung-Sun, Baek Kitae
Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea.
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.
J Environ Manage. 2017 Jan 15;186(Pt 2):314-319. doi: 10.1016/j.jenvman.2016.03.016. Epub 2016 Mar 23.
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 (HO) 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 HO without 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.
与其他修复过程相比，用于清理土壤中重金属和碳氢化合物的化学萃取和氧化过程具有更高的修复效率且耗时更短。在分批萃取/氧化过程中，3%的过氧化氢（HO）和0.1 M的乙二胺四乙酸（EDTA）可分别去除土壤中约70%的石油以及60%的铜和铅。特别是，在不添加任何催化剂的情况下，HO通过溶解天然土壤中的铁氧化物有效地氧化了石油。此外，由于EDTA对金属具有高亲和力，与铁锰羟基氧化物结合的重金属可通过金属-EDTA以及铁-EDTA络合作用被萃取出来。然而，铁-EDTA的强结合作用在萃取-氧化顺序过程中抑制了石油的氧化，因为在使用EDTA的萃取过程中铁被去除了。氧化-萃取顺序过程并没有显著提高从土壤中萃取重金属的效率，因为一小部分重金属仍与有机物结合。总体而言，同时应用氧化和萃取过程可高效去除两种污染物；这种方法可用于在短时间内以合理成本从土壤中去除共污染物。
