Pyrolysis of tobacco waste can provide an effective management
option, as it produces biogas and bio-oils, which can be subsequently
applied for energy recovery, and biochar, which can be used for carbon
sequestration when stored in soils. This work assesses the pyrolysis
behavior of tobacco waste and reveals four stage pyrolysis mechanism
consisting of dehydration (<200 °C), torrefaction (≈300
°C), charring (≈500 °C), and carbonization (≈750
°C). The calorific value of the evolved biogas products at the
charring temperature of 500 °C was estimated to be reasonably
high and the products can be combusted to generate energy required
to self-sustain the pyrolysis process. The bio-oils contained complex
chemical structure consisting of nicotine, phenols, and organic acids.
The biochar product exhibited enrichment in the fixed carbon, ash,
and nutrients P and K, while N remained at relatively constant concentration
throughout the pyrolysis process.
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