Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China.
Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China; Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Road, Shanghai 200092, PR China.
Chemosphere. 2018 Sep;207:742-752. doi: 10.1016/j.chemosphere.2018.05.156. Epub 2018 May 26.
In this study, hydrothermal method was applied for the treatment of five typical waste plastics (PC, HIPS, ABS, PP and PA6). The hydrothermal products of oils and solid residues were analyzed for the product slate and combustion behaviors. Some predominant chemical feedstock were detected in the oils, such as phenolic compounds and bisphenol A (BPA) in PC oils, single-ringed aromatic compounds and diphenyl-sketetons compounds in HIPS and ABS oils, alkanes in PP oils, and caprolactam (CPL) in PA6 oils. The hydrothermal solid residues were subjected to DSC analysis. Except the solid residues of PA6, all the solid residues had enormous improvement on the enthalpy of combustion. The solid residues of PC had the maximum promotion up to 576.03% compared to the raw material. The hydrothermal treatment significantly improved the energy density and facilitated effective combustion. Meanwhile, the glass fiber was recovered from the PA6 plastics. In addition, the combustion behaviors of the uplifting residues were investigated to provide the theoretical foundation for further study of combustion optimization. All the results indicated that the oils of waste plastics after hydrothermal treatment could be used as chemical feedstock; the solid residues of waste plastics after hydrothermal treatment could be used as potentially clean and efficient solid fuels. The hydrothermal treatment for various waste plastics was verified as a novel waste-to-energy technique.
在这项研究中，采用水热法处理了五种典型的废塑料（PC、HIPS、ABS、PP 和 PA6）。对油和固体残留物的水热产物进行了分析，以了解产物种类和燃烧行为。在油中检测到了一些主要的化学原料，如 PC 油中的酚类化合物和双酚 A（BPA）、HIPS 和 ABS 油中的单环芳烃化合物和二苯甲酮化合物、PP 油中的烷烃以及 PA6 油中的己内酰胺（CPL）。对水热固体残留物进行了 DSC 分析。除了 PA6 的固体残留物外，所有固体残留物的燃烧焓都有显著提高。与原料相比，PC 的固体残留物的促进作用最大，达到了 576.03%。水热处理显著提高了能量密度，有利于有效燃烧。同时，从 PA6 塑料中回收了玻璃纤维。此外，还研究了提升残渣的燃烧行为，为进一步研究燃烧优化提供了理论基础。所有结果表明，经水热处理后的废塑料油可作为化学原料使用；经水热处理后的废塑料固体残留物可用作潜在清洁高效的固体燃料。水热法处理各种废塑料被验证为一种新型的废物能源化技术。
