赤泥基颗粒对铅污染土壤的原位稳定化修复  

In-situ stabilization remediation of lead contaminated soil by application of red mud based particles

作　　者：罗惠莉[1,2] 黄圣生[1] 罗琳[2] 刘艳[2] 田杰[2] 

机构地区：[1]中南大学资源加工与生物学院,湖南长沙410083 [2]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《中南大学学报（自然科学版）》2011年第6期1819-1824,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50874046);湖南省高等学校科学研究重点项目(08A032)

摘　　要：以粉状赤泥为原料制备赤泥基颗粒,施加于模拟铅污土中对铅进行原位化学修复。在修复培养期间分别于第5,15,30,60,90天取土样,通过连续提取不同形态铅并测定其含量。对比空白试验,分析不同形态铅含量的变化以确定修复效果,并对修复条件的影响进行研究。研究结果表明：与施用赤泥原料粉相比,赤泥颗粒逐渐释放的游离OH？对土壤pH的影响减小。赤泥颗粒施用量控制在5%,保持22.10%~26.64%土壤含水率,对铅的修复效果好,离子交换态和生物有效态铅含量显著降低,最大降幅分别达94.50%和45.95%,而残渣态铅增幅为48.46%。The red mud based particle was produced by red mud powder and applied to lead contaminated soil for in-situ chemical remediation.Soil samples were taken at 5,15,30,60,90 d during the remediation,and then sequential extraction was used to extract the fractions of lead and the contents were determined.The effects of remediation were analyzed by comparing the changes of different forms of lead to the control trail and the restoration conditions were also studied.Experimental results show that the growth of soil pH is gone down as the gradually releasing of OH-from red mud based particle.When the amount of red mud particle is 5% and the soil moisture is maintained 22.10%-26.64%,the significant remediation of lead in contaminated soil is achieved.The contents of ion-exchange and bio-effective are reduced and the largest decreases are 94.50% and 45.95% while the increase of residual is 48.46%.

关 键 词：赤泥 铅 污染土壤 原位修复 

分 类 号：X758[环境科学与工程—环境工程]