磷酸钾镁胶结材料固化/稳定化重金属污染土壤的研究

摘要

[目的]为了保证食品安全和人类健康,改善土壤质量.[方法]应用磷酸钾镁胶结材料,对受Pb、Cr、Cd、Zn等重金属污染的土壤进行固化/稳定化.[结果]掺加10％ ～40％含量的磷酸钾镁固化体强度均大于1 MPa,可以满足贮存和填埋强度的要求；掺加40％磷酸钾镁28 d养护的固化体Pb、Cr、Cd浸出浓度无检出,掺加10％磷酸钾镁固化体浸出浓度也远小于相关标准限值；不同重金属溶出规律不同,重金属累积释放量由大到小依次为Zn ＞Cd ＞Cr ＞Pb.[结论]磷酸钾镁胶结材料是一种效果较好的重金属污染土壤固化剂.%[Objective] The research aimed to ensure food safety and human health,improve soil quality. [Method] Magnesium potassium phosphate cements material was adopted to solidified/stabilized soil contaminated by Pb,Cr,Cd,Zn,et al. [Result]Solidified strength mixed with 10% -40% magnesium potassium phosphate cements were more than 1 Mpa,which showed that solidified had a high compressive strength and met the requirements of storage and landfill. Leaching concentrations of Pb,Cr,Cd weren' t detected after solidified mixed with 40% magnesium potassium phosphate cements was conserved 28 d and leaching concentrations of solidified mixed with 10% magnesium potassium phosphate cements far less than standard limit values. Different metals had different leaching law and cumulative leaching of metal in descending order was Zn > Cd > Cr > Pb. [Conclusion] Magnesium potassium phosphate cements material was a better heavy metal contaminated soil stabilizer.