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| Remediation effects of a new type of low-temperature-modified fly ash on Cd-contaminated soil |
| Received:December 23, 2017 |
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| KeyWord:cadmium;fly ash;low-temperature modified;immobilization |
| Author Name | Affiliation | E-mail | | ZHAO Hang-hang | College of Natural and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safeproduct, Tianjin 300191, China | | | YANG Yang | Key Laboratory of Functional Material in Power Generation System, Guodian New Energy Technology Research Institute, Beijing 102209, China | | | HUANG Xun-rong | College of Natural and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China | | | ZHANG Gui-bin | College of Natural and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China | | | LI Jing-tian | College of Natural and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China | | | JI Pu-hui | College of Natural and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110012, China | jipuhui1983@163.com |
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| Abstract: |
| A new intermediate and zeolite were made from fly ash under low-temperature and alkali conditions. FA、IP and ZE three materials were characterized by canning electron microscope-energy dispersive spectromet(SEM-EDS), X-ray fluorescence(XRF), BrunauerEmmett-Teller(BET), zero point of charge(pHzpc), etc. analyses. The effects of FA, IP and ZE three immobilizing agents on soil pH, available Cd in soil, mustard biomass, and heavy metal concentration of mustard were investigated using pot experiments. The possible immobilization mechanism of Cd was elucidated. The results showed that application of the three immobilizing agents resulted in reduction of the content of bioavailable Cd in soils and a decrease in the amount of Cd in mustard. Moreover, the available Cd decreased by 48.35% and 46.19%, respectively, after 1.5% IP and ZE passivators were added in the soils, and the content of Cd in the upper part of India mustard reduced by 37.51% and 41.06%, respectively. The soils pH increased about 0.59 and 0.62 units, respectively, after 1.5% IP and ZE passivators were added in the soils, and the biomass of mustard increased 20%. Thus, the IP and ZE passivating agents effectively reduced the available Cd and promoted growth of the crops. In economic terms, the IP had certain economic value for the long-term utilization of fly ash. |
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