| Title: | Low-concentration tailing and subsequent quicklime-enhanced remediation of volatile chlorinated hydrocarbon-contaminated soils by mechanical soil aeration |
| Author(s): | Ma Y; Du X; Shi Y; Xu Z; Fang J; Li Z; Li F; |
| Address: | "College of Water Sciences, Beijing Normal University, Beijing 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Beijing University of Science and Technology, Civil and Environment Engineering Department, Beijing 100083, China. Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta, Binzhou University, Binzhou, Shandong Province 256600, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: ligulax@vip.sina.com" |
| DOI: | 10.1016/j.chemosphere.2014.10.074 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Mechanical soil aeration has long been regarded as an effective ex-situ remediation technique and as suitable for remediation of large-scale sites contaminated by volatile organic compounds (VOCs) at low cost. However, it has been reported that the removal efficiency of VOCs from soil is relatively low in the late stages of remediation, in association with tailing. Tailing may extend the remediation time required; moreover, it typically results in the presence of contaminants residues at levels far exceeding regulations. In this context, the present study aimed to discuss the tailing that occurs during the process of remediation of soils contaminated artificially with volatile chlorinated hydrocarbons (VCHs) and to assess possible quicklime-enhanced removal mechanisms. The results revealed the following conclusions. First, temperature and aeration rate can be important controls on both the timing of appearance of tailing and the levels of residual contaminants. Furthermore, the addition of quicklime to soil during tailing can reduce the residual concentrations rapidly to below the remedial target values required for site remediation. Finally, mechanical soil aeration can be enhanced using quicklime, which can improve the volatilization of VCHs via increasing soil temperature, reducing soil moisture, and enhancing soil permeability. Our findings give a basic understanding to the elimination of the tailing in the application of mechanical soil aeration, particularly for VOCs-contaminated soils" |
| Keywords: | "Calcium Compounds/*chemistry Environmental Restoration and Remediation Hydrocarbons, Chlorinated/*analysis Oxides/*chemistry Oxygen/*chemistry Soil/*chemistry/standards Soil Pollutants/*analysis Temperature Volatile Organic Compounds/*analysis Volatilizat;" |
| Notes: | "MedlineMa, Yan Du, Xiaoming Shi, Yi Xu, Zhu Fang, Jidun Li, Zheng Li, Fasheng eng Research Support, Non-U.S. Gov't England 2014/12/01 Chemosphere. 2015 Feb; 121:117-23. doi: 10.1016/j.chemosphere.2014.10.074. Epub 2014 Nov 26" |
