Consumption of electronics increases due to modern society's growing needs, which
leads to increasing generation of waste electrical and electronic equipment (WEEE).
Recycling of WEEE has been a global concern during the last few decades because of
the toxic compounds that are produced during recycling. Different recycling techniques
have been adapted on a commercial scale in order to overcome this issue, but the recycling
of WEEE still lacks the technology to treat different kinds of feedstocks and to maximise
the recycling rates. Pyrolysis is an alternative that has not been commercialised
yet. One of the challenges for the implementation of this technology is the toxic
brominated organic compounds that can be found in the pyrolysis oils.In this study,
tetrabromobisphenol A (TBBPA), one of the major flame retardants, is reduced in three
different WEEE fractions through solvent extraction as a treatment prior to pyrolysis.
Two solvents have been experimentally investigated: isopropanol and toluene, the latter
of which can be derived from pyrolysis oil. The results indicate that TBBPA was extracted
during pre-treatment. Moreover, the total bromine content of WEEE material was reduced
after the treatment with a maximum reduction of 36.5%. The pyrolysis experiments indicate
that reduction of several brominated organic compounds was achieved in almost all
the tested cases, and two brominated compounds (2,4,6-tribromophenol and 2,5-Dibromobenzo(b)thiophene)
reached complete removal. Also, the thermal decomposition behaviour of the raw samples
and the treated was investigated, showing that the reduction of TBBPA influences the
decomposition by shifting the starting decomposition temperature. (C) 2018 Elsevier
Ltd. All rights reserved.