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| Remediation of Cd-contaminated cropland soil in northen China via the amendment of modified biofuel ash |
| Received:October 30, 2017 |
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| KeyWord:biofuel ash;deactivator;modified;northen China;Cd |
| Author Name | Affiliation | E-mail | | SONG Le | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China | | | HAN Zhan-tao | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China | hanzhantao1977@163.com | | LÜ Xiao-li | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China | | | ZHANG Wei | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China | | | LI Xiong-guang | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
Hebei Geology University, Shijiazhuang 050031, China | | | WANG Lei | Hebei and China Geological Survey Key Laboratory of Groundwater Remediation, Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
Hebei Geology University, Shijiazhuang 050031, China | |
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| Abstract: |
| To provide an excellent way for the remediation of Cd-contaminated cropland in northen China, the bottom ash of the biomass power plant in northen China was selected to produce a heavy metal deactivator(HMD). Isothermal adsorption experiments, pot experiments, and in situ experiments were conducted. The maximum adsorption capacity for Cd was over 10 mg·g-1 and was much higher than that of coal fly ash; the contribution rate of precipitation to total adsorption was less than 30% when the pH of adsorption equilibrium solution was neutral. According to the results of the pot experiments, with the amendment of 3% W/W HMD to soil, the Cd in rice decreased over 80%, and with the amendment of 2% W/W HMD, the Cd in cabbage leaves decreased over 90%. The in situ experiments showed that, with the amendment of 1% W/W HMD, the Cd and Pb in corn root decreased by 53.5% and 64.4%, respectively, and production increased by 20.5%; whereas with the amendment of 2% W/W HMD, the Cd in wheat seed decreased by 33% and production increased by 72.5%. The main chemical composition of HMD made by the bottom ash of the biomass power plant in northen China is silicon, potassium, and calcium, and the risk from its heavy metal content is very low. |
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