The impact of co-combustion of polyethylene plastics and wood in a small residential boiler on emissions of gaseous pollutants, particulate matter, PAHs and 1,3,5- triphenylbenzene

• Published in: Chemosphere (Oxford) 2018-04, Vol.196, p.18-24
• Main Authors: Tomsej, Tomas, Horak, Jiri, Tomsejova, Sarka, Krpec, Kamil, Klanova, Jana, Dej, Milan, Hopan, Frantisek
• Format: Article
• Language: English
• Subjects: 1,3,5-triphenylbenzene; Co-combustion of wood and PE/PET plastic; Emissions; P-quaterphenyl; PAHs; Residential boiler
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2017.12.127

The aim of this study was to simulate a banned but widely spread practice of co-combustion of plastic with wood in a small residential boiler and to quantify its impact on emissions of gaseous pollutants, particulate matter (PM), polycyclic aromatic hydrocarbons (PAHs), and 1,3,5-triphenylbenzene (135TPB), a new tracer of polyethylene plastic combustion. Supermarket polyethylene shopping bags (PE) and polyethylene terephthalate bottles (PET) were burnt as supplementary fuels with beech logs (BL) in an old-type 20 kW over-fire boiler both at a nominal and reduced heat output. An impact of co-combustion was more pronounced at the nominal heat output: an increase in emissions of PM, total organic carbon (TOC), toxic equivalent (TEQ) of 7 carcinogenic PAHs (c-PAHs) and a higher ratio of c-PAHs TEQ in particulate phase was observed during co-combustion of both plastics. 135TPB was found in emissions from both plastics both at a nominal and reduced output. In contrast to findings reported in the literature, 135TPB was a dominant compound detected by mass spectrometry on m/z 306 exclusively in emissions from co-combustion of PE. Surprisingly, six other even more abundant compounds of unknown identity were found on this m/z in emissions from co-combustion of PET. One of these unknown compounds was identified as p-quaterphenyl (pQ). Principal component analysis revealed strong correlation among 135TPB, pQ and five unknown compounds. pQ seems to be suitable tracers of polyethylene terephthalate plastic co-combustion, while 135TPB proved its suitability to be an all-purpose tracer of polyethylene plastics combustion. •Two widespread polyethylene plastic were co-combusted with wood.•Co-combustion had an impact on emissions of gaseous pollutants, PM and PAHs.•Emission factors of 1,3,5-triphenylbenzene were quantified.•A new tracer of polyethylene-terephthalate combustion is proposed.