School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Tsinghua University, Beijing, 100084, China.
CSD Emerging Environmental Technology Center (CETC) (Beijing) Co. Ltd., Beijing, 100192, China.
Environ Sci Pollut Res Int. 2017 Aug;24(24):20072-20081. doi: 10.1007/s11356-017-9574-4. Epub 2017 Jul 12.
The destruction of persistent organic pollutants (POPs) is a large challenge in particular in developing and emerging economies. To date, a detailed assessment of non-combustion technologies with respect to formation of dioxins is lacking. In this study, an assessment of mechanochemical (MC) destruction technology for polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in contaminated soil remediation was conducted. Actual applied conditions of pilot-scale MC POPs destruction process indicates that the temperature increase inside the ball mills has the potential to form high levels of toxic polybrominated and polychlorinated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) when dioxin precursors are present. Therefore, the MC technology was modified for treatment of the PCB and PBDE containing soil including an efficient cooling system which could prevent the formation of PXDD/F during the destruction of PCBs and PBDEs. This is likely relevant for all contaminated soils containing relevant dioxin precursor and need to be considered for treatment of soils with MC and probably other non-combustion technologies. Graphical abstract ᅟ.
持久性有机污染物(POPs)的销毁是一个特别大的挑战,特别是在发展中和新兴经济体中。迄今为止,对于二恶英形成而言,缺乏对非燃烧技术的详细评估。在这项研究中,对用于污染土壤修复的机械化学(MC)破坏多氯联苯(PCBs)和多溴二苯醚(PBDEs)的技术进行了评估。实际应用的中试规模 MC POPs 破坏过程的条件表明,当存在二恶英前体时,球磨机内部的温度升高有可能形成高水平的有毒多溴化和多氯化二苯并对二恶英和二苯并呋喃(PXDD/Fs)。因此,对包括高效冷却系统在内的含有 PCB 和 PBDE 的土壤进行了 MC 技术改造,该冷却系统可以防止在销毁 PCB 和 PBDE 期间形成 PXDD/F。这可能与所有含有相关二恶英前体的污染土壤有关,并且需要考虑使用 MC 和可能的其他非燃烧技术来处理这些土壤。