Solidifying effect of heavy metals in the vanadium deposit-polluted soil by iron-based solid agents.
LI Tian-ran1, JIANG Jian-guo1,2,3, LI De-an1, WANG Jia-ming1
1. School of Environment, Tsinghua University, Beijing 100084, China;
2. Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education, Tsinghua University, Beijing 100084, China;
3. Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing 100084, China
Three kinds of iron-based solid agents, including reducing agents (iron powder and ferrous sulfate), oxidizing agents (ferric oxide), and absorbing agents (steel slag and goethite), were investigated to stabilize vanadium (V) and chromium (Cr) in the vanadium deposit-polluted soil. Results showed that, the stabilization efficiency of such agents decreased as the following order: sulfate> iron powder> goethite> steel slag> ferrous sulfate. After solidifying for 7days at a dosage of 1wt%, the stabilization efficiency of iron powder and ferrous sulfate on V was 97.7% and 98.8%, respectively, using the horizontal vibration method. The stabilization efficiency of reducing agents was similar between the groundwater and acid rain leaching conditions. For an increasing dosage of the agents, the stabilization efficiency of reducing agents gradually increased. With the highest dosage of 2wt%, the efficiency of iron powder on V and Cr was 99.6% and 78.5%, respectively; while the efficiency of ferrous sulfate was 99.9% and 90.6%, respectively. The European Community Bureau of Reference (BCR) test showed that, after stabilization using the reducing agents, both the exchangeable and acid-soluble fractions of V in the soil decreased significantly, while the residual fraction increased.
李天然, 蒋建国, 李德安, 王佳明. 铁基固体材料对钒矿污染土壤的固化效果研究[J]. 中国环境科学, 2016, 36(7): 2108-2114.
LI Tian-ran, JIANG Jian-guo, LI De-an, WANG Jia-ming. Solidifying effect of heavy metals in the vanadium deposit-polluted soil by iron-based solid agents.. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(7): 2108-2114.
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