期刊
WASTE MANAGEMENT
卷 126, 期 -, 页码 65-77出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2021.02.054
关键词
Gasification; Syngas; Plastic waste; Chemical recycling; Chlorine; Dioxins
资金
- RE:Source program
Oxygen blown high-temperature gasification presents an opportunity for chemical recycling of plastic wastes. Gasification efficiencies of two complex plastic wastes were around 80% and 60%, with lower PCDD/F yields compared to direct combustion. A two-stage process further reduced emissions of HCl and PCDD/F.
Oxygen blown high-temperature gasification constitutes an opportunity for chemical recycling of plastic wastes. This article summarizes the results from comparative tests of combustion and gasification of two complex plastic wastes: a plastic reject (PR) from processing recycled paper and an automotive shredder residue (ASR). Calculated gasification efficiencies corresponded to about 80% and 60%, respectively. Gasification resulted in lower yields of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) compared to direct combustion. A two-stage process, including gasification followed by syngas combustion, reduced the emissions of HCl and PCDD/F in the flue gas to <1.4% and 0.2%, respectively, compared to the levels from direct combustion of the PR feedstock. Most of the PCDD/F ( 99%) was captured along with particulate matter (soot) during gasification. The contribution to the toxic concentration of PCDD/F was mainly from the PCDF congeners. Fly ash particulate matter from ASR combustion contained a significant proportion of zinc, which thus constitutes a great potential for use in zinc recycling. (c) 2021 Elsevier Ltd. All rights reserved.
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