新型TMT-硫酸铁固定剂对重金属污染土壤的修复研究
Soil remediation technology contaminated by heavy metals with a novel TMT-ferric sulfate stabilizer
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摘要: 以新型TMT(三巯基均三嗪三钠盐)-硫酸铁复配混合物为化学固定剂,考察了其对湖南郴州某重金属污染土壤中铅、镉、砷的固定效果.结果表明,单一使用TMT(含15 %(质量分数)TMT的水溶液)为固定剂时,土壤中的有效态铅、镉去除率高于60 %,但对砷没有固定效果.使用TMT-硫酸铁复配固定剂时,控制硫酸铁投加量为35.7 g/kg,TMT投加量为0.1 L/kg时,有效态铅、镉去除率达到90 %以上.随着土壤含水量的增加,土壤中有效态铅、镉的含量显著降低.当控制硫酸铁投加量为35.7 g/kg,TMT投加量为0.04 L/kg,控制土壤含水量至田间持水量的70 %,固定60 d,有效态铅、镉的去除率在80 %以上,有效态砷的去除率可达到60 %.Abstract: The stable effect of Lead (Pb), cadmium (Cd), arsenic (As) on the heavy metal polluted soils in Chenzhou Hunan were stabilized with a noval stabilizer of TMT-ferric sulfate. The results showed that TMT(aqueous solution containing 15%TMT)decreased the available contents of Pb, Cd more than 60%, but the available contents of As were not decreased. the available contents of Pb,Cd were decreased more than 90% with 35.7 g/kg ferric sulfate and 0.1 L/kg TMT. The available contents of Pb, Cd were decreased significantly with increasing soil water content. 60 days later, the available contents of Pb, Cd were decreased more than 80% and the available contents of As were decreased 60% with 35.7 g/kg ferric sulfate and 0.04 L/kg TMT when the soil water content was 70% of field capacity capacity lasting 60 days..