钙基固化剂对钒矿污染土壤固化效果的研究

发布时间：2018-03-24 03:11

本文选题：重金属污染土壤　切入点：钙基固化剂　出处：《农业环境科学学报》2016年02期

【摘要】：针对国内外对钒矿污染土壤修复研究少的现状,选择氧化钙、氯化钙、羟基磷灰石三种钙基固化剂对钒矿污染土壤进行固化效果研究。结果表明:在中性环境下,三种钙基固化剂分别在0.5%、1%、2%添加量时,对钒(V)的固化率由高到低依次为氧化钙氯化钙羟基磷灰石,对铬(Cr)的固化效果为氧化钙优于氯化钙和羟基磷灰石;除添加2%氯化钙外,其他固化剂的不同添加量均降低了V的伴生重金属Cd、Cu、Pb、Zn的浸出量;在添加量2%、固化3h时,氧化钙对V和Cr的固化率分别达到99.0%和38.6%;氧化钙固化污染土壤后,V的残渣态比例为22.9%,比固化前提高了76.2%。
[Abstract]:Aiming at the present situation of little research on the remediation of vanadium ore contaminated soil at home and abroad, calcium oxide, calcium chloride and hydroxyapatite were selected to study the solidification effect of calcium oxide, calcium chloride and hydroxyapatite on vanadium ore contaminated soil. The curing efficiency of the three calcium based curing agents is calcium oxide, calcium chloride hydroxyapatite, and chromium-cr, respectively, when the content of the three calcium curing agents is 0.5% and 2%, respectively, and the curing effect of calcium oxide is superior to that of calcium chloride and hydroxyapatite, except for the addition of 2% calcium chloride, the curing effect of calcium oxide is better than that of calcium chloride and hydroxyapatite, except for the addition of 2% calcium chloride. The addition of other curing agents decreased the leaching amount of CD _ (2) Cu ~ (2 +) Pb ~ (2 +) Zn, a heavy metal associated with V, and at the addition of 2%, solidified for 3 h, the leaching rate of Pb ~ (2 +) Zn was decreased. The solidification rates of calcium oxide to V and Cr were 99.0% and 38.6%, respectively, and the proportion of residual state of V after calcium oxide curing contaminated soil was 22.9m, which was 76.2% higher than that before solidification.
【作者单位】：清华大学环境学院;哈尔滨师范大学生命科学与技术学院;固体废物处理与环境安全教育部重点实验室;
【基金】：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)
【分类号】：X53;X753

【相似文献】