| Title: | Treatability of volatile chlorinated hydrocarbon-contaminated soils of different textures along a vertical profile by mechanical soil aeration: A laboratory test |
| Author(s): | Ma Y; Shi Y; Hou D; Zhang X; Chen J; Wang Z; Xu Z; Li F; Du X; |
| Address: | "School of Chemical and Environmental Engineering, China University of Mining &Technology, Beijing 100083, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: mayan2202@163.com. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. School of Environment, Tsinghua University, Beijing 100084, China. BGI Engineering Consultants Ltd., Beijing 100038, China. School of Chemical and Environmental Engineering, China University of Mining &Technology, Beijing 100083, China. School of Environment and Energy, Peking University, Shenzhen 518055, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: duxiaom1963@126.com" |
| DOI: | 10.1016/j.jes.2016.09.019 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "Mechanical soil aeration is a simple, effective, and low-cost soil remediation technology that is suitable for sites contaminated with volatile chlorinated hydrocarbons (VCHs). Conventionally, this technique is used to treat the mixed soil of a site without considering the diversity and treatability of different soils within the site. A laboratory test was conducted to evaluate the effectiveness of mechanical soil aeration for remediating soils of different textures (silty, clayey, and sandy soils) along a vertical profile at an abandoned chloro-alkali chemical site in China. The collected soils were artificially contaminated with chloroform (TCM) and trichloroethylene (TCE). Mechanical soil aeration was effective for remediating VCHs (removal efficiency >98%). The volatilization process was described by an exponential kinetic function. In the early stage of treatment (0-7hr), rapid contaminant volatilization followed a pseudo-first order kinetic model. VCH concentrations decreased to low levels and showed a tailing phenomenon with very slow contaminant release after 8hr. Compared with silty and sandy soils, clayey soil has high organic-matter content, a large specific surface area, a high clay fraction, and a complex pore structure. These characteristics substantially influenced the removal process, making it less efficient, more time consuming, and consequently more expensive. Our findings provide a potential basis for optimizing soil remediation strategy in a cost-effective manner" |
| Keywords: | "China Environmental Restoration and Remediation/*methods Hydrocarbons, Chlorinated/analysis/*chemistry Kinetics Soil/chemistry Soil Pollutants/analysis/*chemistry Volatile Organic Compounds/analysis/*chemistry Contaminated site Mechanical soil aeration Pa;" |
| Notes: | "MedlineMa, Yan Shi, Yi Hou, Deyi Zhang, Xi Chen, Jiaqi Wang, Zhifen Xu, Zhu Li, Fasheng Du, Xiaoming eng Netherlands 2017/04/11 J Environ Sci (China). 2017 Apr; 54:328-335. doi: 10.1016/j.jes.2016.09.019. Epub 2016 Nov 19" |
