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pH-dependent leaching behaviour and other performance properties of cement-treated mixed contaminated soil
作者姓名:Reginald B. Kogbar  Abir Al-Tabb  Yaolin Yi  Julia A. Stegemann
作者单位:Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia;Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Institute of Geotechnical Engineering, Southeast University, 2# Sipailou, Nanjing 210096, China;Department of Civil, Environmental and Geomatic Engineering, Chadwick Building, University College, London, WC1E 6BT, UK
基金项目:This article was written to support the ProCeSS project, which was conducted by a consortium of five universities, led by University College London, and 17 industrial partners, under the UK DIUS Technology Strategy Board (TP/3/WMM/6/I/15611). The project website is at http://www.cege.ucl.ac.uk/process.
摘    要:Portland cement has been widely used for stabilisation/solidification (S/S) treatment of contaminated soils. However, there is a dearth of literature on pH-dependent leaching of contaminants from cement-treated soils. This study investigates the leachability of Cu, Pb, Ni, Zn and total petroleum hydrocarbons (TPH) from a mixed contaminated soil. A sandy soil was spiked with 3000 mg/kg each of Cd, Cu, Pb, Ni and Zn, and 10,000 mg/kg of diesel, and treated with ordinary Portland cement (CEM I). Four different binder dosages, 5%, 10%, 15% and 20% (m/m) and different water contents ranging from 13%-19% dry weight were used in order to find a safe operating envelope for the treatment process. The pH-dependent leaching behaviour of the treated soil was monitored over an 84-day period using a 3-point acid neutralisation capacity (ANC) test. The monolithic leaching test was also conducted. Geotechnical properties such as unconfined compressive strength (UCS), hydraulic conductivity and porosity were assessed over time. The treated soils recorded lower leachate concentrations of Ni and Zn compared to the untreated soil at the same pH depending on binder dosage. The binder had problems with Pb stabilisation and TPH leachability was independent of pH and binder dosage. The hydraulic conductivity of the mixes was generally of the order, 10-8 m/sec, while the porosity ranged from 26%-44%. The results of selected performance properties are compared with regulatory limits and the range of operating variables that lead to acceptable performance described.

关 键 词:diesel  heavy  metals  hydraulic  conductivity  porosity  Portland  cement  stabilisation/solidification
收稿时间:21 November 2011
修稿时间:12 March 2012

pH-dependent leaching behaviour and other performance properties of cement-treated mixed contaminated soil
Reginald B. Kogbar,Abir Al-Tabb,Yaolin Yi,Julia A. Stegemann.pH-dependent leaching behaviour and other performance properties of cement-treated mixed contaminated soil[J].Journal of Environmental Sciences,2012,24(9):1630-1638.
Authors:Reginald B Kogbar  Abir Al-Tabba  Yaolin Yi and Julia A Stegemann
Institution:Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia;Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Geotechnical and Environmental Group, Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK;Institute of Geotechnical Engineering, Southeast University, 2# Sipailou, Nanjing 210096, China;Department of Civil, Environmental and Geomatic Engineering, Chadwick Building, University College, London, WC1E 6BT, UK
Abstract:Portland cement has been widely used for stabilisation/solidification (S/S) treatment of contaminated soils. However, there is a dearth of literature on pH-dependent leaching of contaminants from cement-treated soils. This study investigates the leachability of Cu, Pb, Ni, Zn and total petroleum hydrocarbons (TPH) from a mixed contaminated soil. A sandy soil was spiked with 3000 mg/kg each of Cd, Cu, Pb, Ni and Zn, and 10,000 mg/kg of diesel, and treated with ordinary Portland cement (CEM I). Four different binder dosages, 5%, 10%, 15% and 20% (m/m) and different water contents ranging from 13%-19% dry weight were used in order to find a safe operating envelope for the treatment process. The pH-dependent leaching behaviour of the treated soil was monitored over an 84-day period using a 3-point acid neutralisation capacity (ANC) test. The monolithic leaching test was also conducted. Geotechnical properties such as unconfined compressive strength (UCS), hydraulic conductivity and porosity were assessed over time. The treated soils recorded lower leachate concentrations of Ni and Zn compared to the untreated soil at the same pH depending on binder dosage. The binder had problems with Pb stabilisation and TPH leachability was independent of pH and binder dosage. The hydraulic conductivity of the mixes was generally of the order, 10-8 m/sec, while the porosity ranged from 26%-44%. The results of selected performance properties are compared with regulatory limits and the range of operating variables that lead to acceptable performance described.
Keywords:diesel  heavy metals  hydraulic conductivity  porosity  Portland cement  stabilisation/solidification
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