Liu Xitao, Zhang Qing, Zhang Guixiang, Wang Ran
Institute of Soil and Environmental Sciences, School of Environment, Beijing Normal University, Beijing 100875, China.
Chemosphere. 2008 Aug;72(11):1655-8. doi: 10.1016/j.chemosphere.2008.05.030. Epub 2008 Jun 27.
The applicability of microwave irradiation in the removal of polychlorinated biphenyls (PCBs) from the soil heavily contaminated by capacitor oil was studied. Granular activated carbon (GAC) was added into the soil as a microwave-absorbing material to rapidly increase the temperature of the reaction system. Effects of sodium hypophosphite (SHP) and iron powder (IP) as reductants on PCB removal, as well as the effects of water content in soil, microwave power and the amount of GAC added were investigated. The results indicated that in the presence of SHP and GAC, about 80% of PCBs in soil were effectively removed by 10 min microwave irradiation, and the further addition of IP could raise the average removal efficiency to a higher level, more than 95%. In the removal of PCBs with the microwave/GAC/IP/SHP system, an appropriate amount of water proved to be helpful in promoting the removal of PCBs from soil by steam distillation and in acting as a co-solvent of SHP and H-donor of IP.
研究了微波辐照在去除被电容器油严重污染土壤中多氯联苯（PCBs）方面的适用性。向土壤中添加颗粒活性炭（GAC）作为微波吸收材料，以快速提高反应体系的温度。研究了次磷酸钠（SHP）和铁粉（IP）作为还原剂对多氯联苯去除的影响，以及土壤含水量、微波功率和GAC添加量的影响。结果表明，在SHP和GAC存在的情况下，通过10分钟的微波辐照可有效去除土壤中约80%的多氯联苯，进一步添加IP可将平均去除效率提高到更高水平，超过95%。在微波/GAC/IP/SHP体系去除多氯联苯的过程中，适量的水被证明有助于通过水蒸气蒸馏促进土壤中多氯联苯的去除，并作为SHP的助溶剂和IP的氢供体。
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