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Chemosphere

Title:		Quicklime-induced changes of soil properties: Implications for enhanced remediation of volatile chlorinated hydrocarbon contaminated soils via mechanical soil aeration
Author(s):		Ma Y; Dong B; He X; Shi Y; Xu M; He X; Du X; Li F;
Address:		"School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China; Department of Soil Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China. School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China. Department of Soil Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China. Department of Soil Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China. Electronic address: ligulax@vip.sina.com"
Journal Title:		Chemosphere
Year:		2017
Volume:		20170116
Issue:
Page Number:		435 - 443
DOI:		10.1016/j.chemosphere.2017.01.067
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Mechanical soil aeration is used for soil remediation at sites contaminated by volatile organic compounds. However, the effectiveness of the method is limited by low soil temperature, high soil moisture, and high soil viscosity. Combined with mechanical soil aeration, quicklime has a practical application value related to reinforcement remediation and to its action in the remediation of soil contaminated with volatile organic compounds. In this study, the target pollutant was trichloroethylene, which is a volatile chlorinated hydrocarbon pollutant commonly found in contaminated soils. A restoration experiment was carried out, using a set of mechanical soil-aeration simulation tests, by adding quicklime (mass ratios of 3, 10, and 20%) to the contaminated soil. The results clearly indicate that quicklime changed the physical properties of the soil, which affected the environmental behaviour of trichloroethylene in the soil. The addition of CaO increased soil temperature and reduced soil moisture to improve the mass transfer of trichloroethylene. In addition, it improved the macroporous cumulative pore volume and average pore size, which increased soil permeability. As soil pH increased, the clay mineral content in the soils decreased, the cation exchange capacity and the redox potential decreased, and the removal of trichloroethylene from the soil was enhanced to a certain extent. After the addition of quicklime, the functional group COO of soil organic matter could interact with calcium ions, which increased soil polarity and promoted the removal of trichloroethylene"
Keywords:		"Aluminum Silicates/chemistry Calcium Compounds/*chemistry Clay Environmental Restoration and Remediation Hydrocarbons, Chlorinated/*chemistry Oxides/*chemistry Soil/chemistry Soil Pollutants/*chemistry Mechanical soil aeration Physical/chemical properties;"
Notes:		"MedlineMa, Yan Dong, Binbin He, Xiaosong Shi, Yi Xu, Mingyue He, Xuwen Du, Xiaoming Li, Fasheng eng England 2017/01/28 Chemosphere. 2017 Apr; 173:435-443. doi: 10.1016/j.chemosphere.2017.01.067. Epub 2017 Jan 16"