of dried sewage sludge is regarded as an effective treatment
method as well as a promising technology for energy/fuel production.
In this work, thermochemical conversion of dried sewage sludge in
a continuous reactor at different pyrolysis temperatures (400–800
°C) and solid residence times (6–46 min) was conducted.
The pyrolysis products obtained using different pyrolysis conditions
were extensively investigated. It is indicated that high pyrolysis
temperature (>700 °C) and long solid residence time (>23
could enhance secondary reactions and decrease the yield of bio-oil.
The maximum yield of bio-oil of 16.69% was achieved at reaction temperature
of 700 °C and solid residence time of 23 min. The FTIR and GC-MS
analyses of the bio-oil obtained at optimum condition indicated that
it contained large amounts of phenols and esters. H2 and
CO2 were the main components of pyrolysis gas, with a total
amount that exceeded 52.18%. The characteristics of the char, including
elemental composition, functional groups, and combustion property
were investigated by XRF, FTIR, and TG. FTIR analysis of the char
showed that the main functional groups are M–X, C–O,
and C–H. The volatile content in the char decreased with an
increase of pyrolysis temperature, while it increased with an increase
of solid residence time. Heavy metals distribution in pyrolysis products
of dried sewage sludge were investigated by inductively coupled plasma
atomic emission spectroscopy. The results showed that most of the
heavy metals remained in char. In addition, the potential ecological
risk assessment of heavy metals was assessed.
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