Zhao Zhong-Hua, Li Xiao-Dong, Ni Ming-Jiang, Chen Tong, Yan Jian-Hua
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2017 Apr;24(12):11800-11806. doi: 10.1007/s11356-017-8734-x. Epub 2017 Mar 24.
The combination of mechanochemical method and thermal desorption for remediating polychlorinated biphenyls (PCBs) in contaminated soil was tested in this study. The effects of grinding time and heating time on PCB removal efficiency were investigated. The contaminated soil, mixed with CaO powder at a weight ratio of 1:1, was first ground using a planetary ball mill. After 4 h of grinding, the total PCB concentration and its toxic equivalence quantity (TEQ) decreased by 74.6 and 75.8%, respectively. Then, after being heated at 500 °C for 60 min, the residual PCBs in mechanochemical + thermal treated soil decreased to 247 ng/g, resulting in a removal efficiency of 99.95%. The removal effect can be promoted by longer grinding time and heating time; however, increased energy consumption was inevitable. The combination of grinding time and heating time should be optimized in a practical remediation process.
本研究测试了机械化学法与热脱附相结合修复污染土壤中多氯联苯（PCBs）的效果。研究了研磨时间和加热时间对多氯联苯去除效率的影响。将污染土壤与氧化钙粉末按重量比1:1混合，首先使用行星式球磨机进行研磨。研磨4小时后，多氯联苯的总浓度及其毒性当量（TEQ）分别下降了74.6%和75.8%。然后，在500℃加热60分钟后，机械化学+热处理土壤中的残留多氯联苯降至247 ng/g，去除效率达到99.95%。较长的研磨时间和加热时间可促进去除效果；然而，能耗增加是不可避免的。在实际修复过程中，应优化研磨时间和加热时间的组合。
