中国环境科学
 
 
中国环境科学  2016, Vol. 36 Issue (7): 2108-2114    DOI:
土壤污染与控制 最新目录| 下期目录| 过刊浏览| 高级检索 |
铁基固体材料对钒矿污染土壤的固化效果研究
李天然1, 蒋建国1,2,3, 李德安1, 王佳明1
1. 清华大学环境学院, 北京 100084;
2. 清华大学固体废物处理与环境安全教育部重点实验室, 北京 100084;
3. 清华大学区域环境质量协同创新中心, 北京 100084
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

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摘要 

选用还原性材料铁粉、硫酸亚铁,氧化性材料三氧化二铁,吸附性材料钢渣、针铁矿,共5种3类铁基固体材料对钒冶炼渣污染的土壤进行了固化研究.结果表明,固定效率由高到低依次为硫酸亚铁>铁粉>针铁矿>钢渣>三氧化二铁.在1%的添加量、固化7d的固化条件及水平振荡的检测方法下,铁粉、硫酸亚铁对V的固定效率分别达到了97.7%和98.8%.模拟酸雨的浸出环境对还原性材料影响不大.还原性材料固化1d内对V和Cr便达到较高固定效率,之后30d内固定效率呈现轻微下降趋势.随材料用量增加,还原性材料对V和Cr的固定效率增大,实验最大用量2%时,铁粉对两者固定效率分别达到99.6%和78.5%,硫酸亚铁达到99.9%和90.6%.BCR分析表明,还原性材料对实验土样固化后,大幅降低了V的酸提取态,增加了V的可氧化态.

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关键词 土壤重金属固化/稳定化铁基    
Abstract

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.

Key wordsvanadium    soil    heavy metal    solidification/stabilization    iron-based agents   
收稿日期: 2015-12-18     
: X53  
基金资助:

丹江口库区小流域特色矿产重金属污染全过程控制关键技术研究与示范(2015ZX07205-003)

通讯作者: 蒋建国,教授,jianguoj@mail.tsinghua.edu.cn     E-mail: jianguoj@mail.tsinghua.edu.cn
作者简介: 李天然(1991-),男,山东枣庄人,清华大学硕士研究生,主要从事固体废弃物处理处置与资源化的研究.
引用本文:   
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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