摘要
通过比较不同稳定剂、固化剂、土壤pH条件下土壤中重金属锑的修复效果,研究了锑的固化-稳定化影响因素并探讨了相关稳定化机理。实验结果表明:铁基稳定剂的效果明显优于磷酸二氢钾和腐殖酸钠,而零价铁的稳定化效果更优于硫酸铁和硫酸亚铁,较适宜的稳定剂投加量为5%(w);水泥做固化剂对锑的稳定化效果优于氧化钙,最佳投加量为5%(w);土壤pH为7左右时,锑的稳定化效果较好;稳定剂的投加使得部分不稳定状态(可交换态)锑转化为稳定状态(残渣态和铁锰氧化物结合态),从而降低了锑的浸出质量浓度。
By comparing the remediation effects of different stabilizing agents,curing agents and pH conditions,the factors affecting the solidification/stabilization of antimony contaminated soil were studied and the related mechanism was discussed.The results showed that:The effect of iron-based stabilizing agent was better than that of potassium dihydrogen phosphate and sodium humate,and that of zero-valent iron was obviously better than ferric sulfate and ferrous sulfate;The suitable dosage of stabilizing agent was 5%(w);The effect of cement as curing agent on antimony stabilization was better than that of calcium oxide while the optimum dosage was 5%(w);The stabilization effect of antimony was better when the soil pH was close to 7;The addition of stabilizing agent makes part of the unstable form(exchangeable form)of antimony into stable form(residual form and iron-manganese oxide bound form),thereby reducing the leaching mass concentration of antimony.
作者
梁颖
LIANG Ying(SGIDI Engineering Consulting(Group)Co.,Ltd.,Shanghai 200093,China;Shanghai Engineering ResearchCenter of Geo-Environment,Shanghai 200093,China)
出处
《化工环保》
CAS
CSCD
北大核心
2021年第1期61-65,共5页
Environmental Protection of Chemical Industry
基金
国家重点研发计划项目(2018YFC1800600)。
关键词
锑污染
固化
稳定化
铁基稳定剂
土壤修复
antimony pollution
solidification
stabilization
iron-based s stabilizing agent
soil remediation
