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| Study on the removal of heavy metals in soil by low molecular weight organic acid and organic acid polymer |
| Received:January 15, 2018 |
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| KeyWord:leaching;fumaric acid;2-acrylamido-2-methylpropane sulfonic acid copolymer;heavy metal |
| Author Name | Affiliation | E-mail | | XIA Zhen-hua | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | rsz@163.com | | CAO Ya-ru | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHONG Qin-mei | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LIU Xi-meng | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| It is necessary to remove heavy metals from contaminated soils. The effects of fumaric acid(FA)and 2-acrylamido-2-methylpropanesulfonic acid copolymer(AMPS-AA)on the removal of Cd, Pb, and Zn from soils at different concentrations, pH, and time durations were studied by soil washing, and compared with those of ethylenediaminetetraacetic acid(EDTA). The results indicated that the efficiency of Cd, Pb, and Zn removal from the soil increased at first, and then became steady with the increase in the concentrations of organic acid. The Cd, Pb, and Zn removal efficiencies at the leaching concentration of 10 g·L-1 were 42.03%, 55.00%, and 46.97% respectively for FA, and 54.75%, 69.60%, and 51.42% respectively for AMPS-AA, compared with those of EDTA, which were 45.44%, 38.29%, and 34.11% respectively. The two organic acids can effectively remove Pb, Zn, and Cd in the soil at a pH ranging from 4 to 5, and their removal abilities were greatly affected by the pH. The leaching times of their maximum efficiencies were 60 minutes for FA and over 120 minutes for AMPSAA. In addition, the exchangeable and carbonate bound fractions of Cd, Pb, and Zn in the soil decreased significantly after leaching with the agents. Therefore, FA and AMPS-AA have potential for the remediation of heavy metals in contaminated soils. |
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