Effect of rice husk biochar on bioavailability of rare earth elements in polluted soil
LI Meng-ke1, ZHOU Dan1,2, GAO Zhen1, JANG Xing-xing1, LUO Xian-ping2
1. College of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Jiangxi Provincial Key Laboratory of Pollution Control for Mining & Metallurgy Environmental Pollution Control, Ganzhou 341000, China
This study was conducted to investigate the effect of Rice hull ash (RHA) and rice hull biochar (RHB) on the bioavailability of rare earth elements (REEs) in the acidic soil. RHA and RHB were mixed into the artificially polluted soil at 0 (W/W), 5% (W/W, and 10% (W/W), respectively. pot experiments were conducted to assess the bioaccumulation of rare earth elements (REEs) by Carrot and chrysanthemum, which sequential extraction was used to analyze the change of REEs' fraction in the soil. The results of pot experiment indicated that the acid extractable of REEs decreased 31.56%, and 19.915% in the soil with 10% RHA and 10% RHB, comparing with the control group. Furthermore, the uptake of REEs by Carrot and chrysanthemum reduced 98.08% and 93.41% in the soil amended by 10% RHA, and decreased 68.61% and 66.75% with 10% RHB. In short, the addition of RHA and RHB can significantly decrease the bioavailability of REEs and restrain the plant's enrichment. Moreover, the amendment effect of RHA was better than the RHB, so the ash of crop straw, as a kind of convenient and effective soil conditioner, need to be valued application on the contaminated soil.
李梦柯, 周丹, 高震, 江星星, 罗仙平. 稻壳生物炭对污染土壤中稀土元素生物有效性的影响[J]. 中国环境科学, 2018, 38(10): 3823-3832.
LI Meng-ke, ZHOU Dan, GAO Zhen, JANG Xing-xing, LUO Xian-ping. Effect of rice husk biochar on bioavailability of rare earth elements in polluted soil. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(10): 3823-3832.
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