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| Remediation of PAHs Contaminated Soil at Coking Site by Integrated Electrokinetics and Chemical Oxidation |
| Received:March 05, 2014 |
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| KeyWord:coking site soil;PAHs;electrokinetics;chemical oxidation;combined remediation |
| Author Name | Affiliation | E-mail | | ZHANG Hai-ou | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | GUO Shu-hai | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | shuhaiguo@iae.ac.cn | | LI Feng-mei | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | WU Bo | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | |
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| Abstract: |
| Soils at coking sites have been heavily contaminated with PAHs. Currently there is lack of effective remediation techniques for PAHs-contaminated soils. In this study, the efficiencies of chemical oxidation and electrokinetics and their integration for remediating PAHs heavily contaminated soils from coking sites were evaluated in a laboratory-scale experiment. Removal rates of PAHs were 24.86%, 10.27% and 22.19%, respectively, in treatments of electrokinetics, Fenton and activated persulfate. However, higher removal rates of PAHs were achieved for activated persulfate-electrokinetics, electrokinetics-activated persulfate, Fenton-electrokinetics and electrokinetics-Fenton, which were 49.65%, 41.73%, 36.72% and 31.39%, respectively. Integrating electrokinetics and chemical oxidation further enhanced the removal rate of PAHs by 6.53%~27.46% compared to electrokinetics or chemical oxidation alone. The sequence of applying electrokinetics and chemical oxidants and oxidant types impacted on the PAHs removal efficiency. Chemical oxidation- electrokinetics removed 5.33%~7.92% more PAHs than electrokinetics-chemical oxidation did. Applying activated persulfate increased PAHs removal by 12.93% ~10.34% compared to using Fenton. These results show that integration of electrokinetics and chemical oxidation could be a promising pre-treatment technique to remove the PAHs in highly contaminated soils efficiently and to alleviate the residual toxicity. |
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