Polycyclic aromatic hydrocarbons (PAH) formation from the pyrolysis of different municipal solid waste fractions

Abstract

The formation of 2-4 ring polycyclic aromatic hydrocarbons (PAH) from the pyrolysis of nine different municipal solid waste fractions (xylan, cellulose, lignin, pectin, starch, polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET)) were investigated in a fixed bed furnace at 800 °C. The mass distribution of pyrolysis was also reported. The results showed that PS generated the most total PAH, followed by PVC, PET, and lignin. More PAH were detected from the pyrolysis of plastics than the pyrolysis of biomass. In the biomass group, lignin generated more PAH than others. Naphthalene was the most abundant PAH, and the amount of 1-methynaphthalene and 2-methynaphthalene was also notable.Phenanthrene and fluorene were the most abundant 3-ring PAH, while benzo[a]anthracene and chrysene were notable in the tar of PS, PVC, and PET. 2-ring PAH dominated all tar samples, and varied from 40 wt.% to 70 wt.%. For PS, PET and lignin, PAH may be generated directly from the aromatic structure of the feedstock.

PAHs and potentially toxic elements in the fly ash and bed ash of biomass fired power plants

“…But the BA was dominated by 3 ring compounds (11-54%) followed by 4 (19-50%) and 5 (4-43%) ring compounds (Table 5). Naphthalene was the most abundant PAH in a MSW incinerator [87]. In a coal fired power plant, FAs were dominated by medium and low molecularweight PAHs, whereas bottom ashes were abundant in 5-and 6-ring PAH species [88].…”

Application of High-Resolution NMR and GC–MS to Study Hydrocarbon Oils Derived from Noncatalytic Thermal Transformation of e-Waste Plastics

“…Hydrocarbons such as acetylene (C 2 H 2 ) are also expected and reported to be some of the degradation products of SAN plastics and play an important role toward the formation of PAHs through a hydrogen abstraction acetylene addition (HACA) mechanism. 27 The HACA mechanism leads to the formation of additional aromatic rings via ring closures and has been widely reported in the literature. 28−30 The mechanism in Figure 4 accounts for the formation of styrene and naphthalene.…”

Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

“…One of the main problems with pyrolysis is that toxic compounds such as dioxins and polyaromatic hydrocarbons (PAHs) can be produced (Zhou et al, 2015). PAHs and Dioxins are poorly soluble in water however they have been found on fine dust particles which could be suspended in water (Minomo et al, 2018;Vandermarken et al, 2018).…”

“…Furthermore, avoiding the use of certain feedstocks such as chlorine containing plastics, or copper containing materials can reduce the amounts of dioxins produced by the incomplete dehydrochlorination and de novo synthesis pathways respectively (Huang and Buekens, 1995;Zhou et al, 2016). PAHs can also be reduced through avoiding the use of certain feedstocks, mainly plastics (L. Zhou et al, 2015). Moreover, the production of biochar adsorbents using a heat pipe based reactor has not to the knowledge of the authors been conducted in any current literature.…”