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| Effects of three organic materials on Cd2+ adsorption capacity and remediation of Cd contaminated soil |
| Received:October 01, 2017 |
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| KeyWord:bagasse sludge;rapeseed cake;tobacco waste;Cd;isothermal adsorption;pakchoi |
| Author Name | Affiliation | E-mail | | LIU Yuan-yuan | College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | LIU Chao | College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Zhuo-jun | College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | XU Zhi | College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | TANG Li | College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | ltang@ynau.edu.cn |
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| Abstract: |
| This research aimed to study economic and effective technologies for use in repairing farmland soil damaged by heavy metal contamination. Specifically, it focused on cadmium(Cd) adsorption capacity in three typical agricultural organic wastes in Yunnan Province of China:Tobacco waste(TW), bagasse sludge(BS), and rapeseed cake(RC) using an isothermal adsorption method. A soil culture and biological assay were carried out to investigate the available Cd in soil and the Cd uptake by pakchoi. The adsorption capacity of the three organic materials was ranked as BS > RC > TW. The maximum adsorption capacity(Qmax) of BS was 2 106.20 mg·kg-1. Compared with the control, TW, BS, and RC significantly reduced Cd bioavailability in soils by 39.79%, 48.81%, and 47.77%, respectively. BS and RC application decreased the Cd concentration in pakchoi significantly when compared with the control, and the decrease was 35.93% and 34.43%, respectively. Compared with the control, BS and RC application increased the pakchoi fresh weight significantly by 81.42% and 96.88%, and increased dry weight by 131.75% and 128.91%, respectively. Thus, the effect of BS on reducing soil Cd contamination was the most effective among the three organic materials. |
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