Zhao Long, Zhu Tengfei, Hou Hong, Qin Xiaopeng, Li Fasheng, Terada Akihiko, Hosomi Masaaki
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Dayangfang 8, Beijing, 100012, People's Republic of China.
Department of Chemical Engineering, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan.
Environ Sci Pollut Res Int. 2015 Nov;22(22):17527-39. doi: 10.1007/s11356-015-4939-z. Epub 2015 Jul 4.
Thermal treatments are the primary technologies used to remove persistent organic pollutants from contaminated solids. The high energy consumption during continuous heating, required cost for treating the exhaust gas, and potential formation of secondary pollutants during combustion have prevented their implementation. A novel successive self-propagated sintering process was proposed for removing polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) from contaminated solids in a low-cost and environmentally friendly way. Nine laboratory-scale experiments involving different initial concentrations of pollutants and solid compositions were performed. Almost all PCBs (>99%) and HCB (>97%) were removed from solids under constant experimental conditions. Varying initial concentrations of PCBs and HCB in the contaminated solids did not influence the removal efficiency of the pollutants; however, the degradation efficiency of pollutants increased as their initial concentrations increased. Although varying levels of PCDD/Fs were detected in the effluent gas, they were all within the emission standard limit.
热处理是用于从受污染固体中去除持久性有机污染物的主要技术。连续加热过程中的高能耗、废气处理所需成本以及燃烧过程中潜在的二次污染物形成阻碍了它们的应用。提出了一种新型连续自蔓延烧结工艺，以低成本和环境友好的方式从受污染固体中去除多氯联苯（PCBs）和六氯苯（HCB）。进行了九个涉及不同污染物初始浓度和固体成分的实验室规模实验。在恒定实验条件下，几乎所有的多氯联苯（>99%）和六氯苯（>97%）都从固体中被去除。受污染固体中多氯联苯和六氯苯的初始浓度变化不影响污染物的去除效率；然而，污染物的降解效率随着其初始浓度的增加而提高。尽管在废气中检测到了不同水平的二噁英/呋喃，但它们均在排放标准限值内。
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