磷酸盐对铅污染土壤稳定化修复机理的研究  

Research on the Stabilization Remediation Mechanism of Lead-contaminated Soil Using Phosphate

作　　者：潘露露[1,2] 李天然 蒲维肖[4] 陈文清[1,2] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]川大-日立环境应用技术研究中心,四川成都610065 [3]成都蓉信水务产业有限公司,四川成都610101 [4]中国建筑西南设计研究院有限公司,四川成都610041

出　　处：《安全与环境工程》2017年第3期84-90,102,共8页Safety and Environmental Engineering

摘　　要：在铅污染土壤中分别加入磷酸二氢钠(SDP)、磷酸氢二钠(DSP)、磷酸钠(TPA),研究不同磷酸盐对铅污染土壤的稳定化效果及其修复机理,并与未处理的铅污染土壤进行比较。结果表明:SDP、DSP、TPA处理后,均能在较短的养护时间(5d)后显著降低污染土壤中铅的浸出浓度,最佳稳定率分别达78.98%、86.43%、91.47%,且磷酸盐的作用效果与其投加量呈正相关,稳定化效果能在较长时间内保持稳定;磷酸盐的作用机理主要是通过磷酸根与铅离子生成在较大的pH值范围内稳定存在的磷酸铅类化合物,特别是Pb_(10)(PO_4)_6(OH)_2的形成有利于提高污染土壤中铅的稳定性。The object of this paper is to investigate the effectiveness of repairment and the stabilizational mechanism of sodium dihydrogen phosphate（SDP）,disodium hydrogen phosphate（DSP）,sodium sulfate（TPA）.Compared with untreated lead-contaminated soil,the leaching of lead concentration from soil significantly reduces in a short time（5d）after the stabilization by SDP,DSP,TPA,and the best efficiency can be 78.98%,86.43%,91.47% respectively.In addition,phosphate stabilizing effect remains smooth in the longer term（60d）and positively correlates with dosage.The paper shows that the main remediation mechanism of phosphate is leading phosphate compounds formed by the combination of phosphate and lead ions,and those compounds can be stably exist in the larger pH range,especially Pb10（PO4）6（OH）2.

关 键 词：铅污染土壤 磷酸盐 稳定化机理 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]