铯污染土壤的淋洗修复及淋洗液的回收

核电站事故造成的土壤放射性核素污染会给环境和人群造成极大的健康风险.通过批量实验,研究了不同淋洗剂对铯(Cs)污染土壤的淋洗效果及蒙脱石对其淋洗液的回收效果.结果表明:硫酸铵对土壤中Cs的淋洗效果最佳,当淋洗时间为120min、液固比为20:1时、老化140 d 土壤中Cs的去除率最大为40.0％;在未添加硫酸铵时,蒙...

Leaching remediation of cesium contaminated soil and recovery of leaching solution

After the nuclear power plant accident, the soil contaminated by radionuclides caused great health risks to the environment and the human body. Through batch experiments, the leaching effect of different leaching agents on cesium (Cs) contaminated soil and the recovery effect of montmorillonite on its eluate were studied. The results showed that ammonium sulfate had the best leaching effect for Cs contaminated soil. When the leaching time was 120 min and the liquid solid ratio was 20∶1, the removal rate of Cs from contaminated soil No.7 was 40.0% which was aged for 140 d. When without ammonium sulfate, the adsorption capacity of montmorillonite for Cs was 1032.0 mg·kg−1, however, the adsorption capacity of Cs was decreased by 74.4% when leaching solution contained 0.01 mol·L−1 ammonium sulfate, which significantly inhibited the adsorption of Cs by montmorillonite. This study has determined the best technology, which was suitable for the disposal of Cs contaminated soil in our country. Considering the recovery of the elution waste, montmorillonite is used to recycle and adsorb the elution waste, so as to provide technical reference for the implementation of the actual site project.