Upcycling of Contaminated Plastics Recovered Through Landfill Mining and Pyrolysis to High-Value Products

已知热解产生不同链长和复杂性的可冷凝挥发性有机蒸气，这取决于工艺配置和操作条件。虽然这一过程已经存在了几十年，但为了部署经济的商业系统，还需要应对重大挑战。鉴于塑料是由化石原料制成的，预计热解液体的性质与传统化学品和燃料的性质相似。然而，广泛的非标准化混合废塑料和有机添加剂的存在增强了热转化过程中的二次反应。虽然这些问题需要在传统的塑料增值过程中得到解决，但在通过垃圾填埋场开采回收的塑料的高级热转化的情况下，会遇到更多的不确定性和挑战，因为污染物和化学降解的存在会导致成分的更大变化。

Pyrolysis is known for yielding condensable volatile organic vapours of varying chain length and complexity depending on process configuration and operating conditions. Although the process has been known for decades, significant challenges need to be addressed in order to deploy economic commercial systems. Given that plastics are manufactured from fossil feedstock, the properties of the pyrolysis liquids are expected to be similar to those of conventional chemicals and fuels. However, the wide range of non-standardised mixed waste plastics and presence of organic additives enhance secondary reactions during thermal conversion processes. While these issues need to be addressed in conventional processes of valorisation of plastics, more uncertainties and challenges are encountered in the case of advanced thermal conversion of plastics recovered through landfill mining because the presence of contaminants and chemical degradation result in more variability of the composition.