Vallejo Marta, Fresnedo San Román M, Ortiz Inmaculada, Irabien Angel
Departamento de Ingenierías Química y Biomolecular, ETSIIyT, Universidad de Cantabria, Avda. de los Castros, 39005 Santander, Spain.
Departamento de Ingenierías Química y Biomolecular, ETSIIyT, Universidad de Cantabria, Avda. de los Castros, 39005 Santander, Spain.
Chemosphere. 2015 Jan;118:44-56. doi: 10.1016/j.chemosphere.2014.05.077. Epub 2014 Jun 27.
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) are a family of unintentionally produced persistent organic pollutants (POPs) that have received considerable public and scientific attention due to the toxicity of some of their congeners, more specifically those with chlorine substitution in the 2,3,7,8 positions. The environmental management and control of PCDD/Fs is addressed at a global level through the Stockholm Convention that establishes that POPs should be destroyed or irreversibly transformed in order to reduce or eliminate their release to the environment. Several technologies, including advanced oxidation processes (AOPs) such as photolysis, photocatalysis and Fenton oxidation, have been considered as effective methods for destroying PCDD/Fs in polluted waters. Nevertheless, during the remediation of wastewaters it is critical that the treatment technologies applied do not lead to the formation of by-products that are themselves POPs, especially if PCDD/Fs precursors or chlorine are present in the reaction medium. Despite the high effectiveness of AOPs in the oxidation of major contaminants, scarce references deal with the monitoring of PCDD/Fs in the course of the oxidation process, revealing that a detailed assessment of non-combustion technologies with respect to PCDD/Fs formation is still lacking. This study reports a review of the state of the art related to the potential remediation and/or formation of PCDD/Fs as a result of the application of AOPs for the treatment of polluted waters, warning on the correct selection of the operating conditions.
多氯二苯并对二恶英和多氯二苯并呋喃（PCDD/Fs）是一类无意产生的持久性有机污染物（POPs），由于其中一些同系物具有毒性，特别是那些在2,3,7,8位有氯取代的同系物，因此受到了公众和科学界的广泛关注。《斯德哥尔摩公约》在全球层面解决了PCDD/Fs的环境管理和控制问题，该公约规定，应销毁或不可逆地转化持久性有机污染物，以减少或消除其向环境中的释放。包括光解、光催化和芬顿氧化等高级氧化工艺（AOPs）在内的几种技术，已被认为是在污染水体中销毁PCDD/Fs的有效方法。然而，在废水修复过程中，至关重要的是所应用的处理技术不会导致本身就是持久性有机污染物的副产物形成，特别是如果反应介质中存在PCDD/Fs前体或氯的话。尽管AOPs在氧化主要污染物方面具有高效性，但很少有参考文献涉及氧化过程中PCDD/Fs的监测，这表明仍缺乏对非燃烧技术在PCDD/Fs形成方面的详细评估。本研究报告了对与应用AOPs处理污染水体导致PCDD/Fs潜在修复和/或形成相关的现有技术状态的综述，并就操作条件的正确选择提出了警示。
