Liu Jie, Chen Tong, Qi Zhifu, Yan Jianhua, Buekens Alfons, Li Xiaodong
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2014 Nov;21(22):12739-46. doi: 10.1007/s11356-014-3226-8. Epub 2014 Jun 27.
In this study, thermal desorption was combined with the addition of nano zerovalent iron (nZVI) to remediate polychlorinated biphenyl (PCB)-contaminated soil collected from a storage point for PCB-contaminated capacitors and transformers. The thermal desorption test conditions were varied from 300 to 600 °C, both with blank soil and with 100 mg of nZVI added. Next, the effect of the amount of nZVI added (0, 20, 40, 100, 200 mg) was investigated by thermal treatment at 400 °C. The test results show that thermal desorption eliminates most of the PCB load and that the presence of nZVI clearly enhances thermal desorption. After thermal treatment at 400 °C, a removal efficiency of 94.2 % was reached, with the use of 200 mg of nZVI. At 600 °C, the PCB removal efficiency after 1 h attained 98.35 % with 100 mg of nZVI and 97.40 % without nZVI. The presence of nZVI effectively decreased both the sum and the WHO-TEQ value of the 12 dl-PCBs.
在本研究中，热脱附与添加纳米零价铁（nZVI）相结合，用于修复从多氯联苯（PCB）污染的电容器和变压器储存点采集的受PCB污染土壤。热脱附试验条件在300至600°C之间变化，分别针对空白土壤和添加了100 mg nZVI的土壤。接下来，通过在400°C下进行热处理，研究了添加nZVI的量（0、20、40、100、200 mg）的影响。试验结果表明，热脱附消除了大部分PCB负荷，并且nZVI的存在明显增强了热脱附效果。在400°C下进行热处理后，使用200 mg nZVI时，去除效率达到了94.2%。在600°C下，1小时后，添加100 mg nZVI时PCB去除效率达到98.35%，不添加nZVI时为97.40%。nZVI的存在有效降低了12种二恶英类多氯联苯的总量和WHO-TEQ值。
