Abstract
AbstractProducing hydrochar from landfill municipal solid wastes (MSW) is a sustainable alternative to existing waste management practices in low‐ and middle‐income countries. In this study, mixed MSW feedstock (sent for landfilling) was subjected to hydrothermal carbonization to produce hydrochars. The hydrochar showing the highest heating value was subjected to pyrolysis at 5, 10, and 20 K min−1 heating rates. Based on the pyrolysis characteristics, a three pseudo‐component‐based distributed activation energy model was employed to describe the pyrolysis kinetics. The activation energy distributions for the three pseudo‐components were 140 ± 8.7 kJ mol−1, 190 ± 1 kJ mol−1 and 175.9 ± 24.9 kJ mol−1, which were able to predict the pyrolysis profile at all heating rates with R2 > 0.999. Differential thermogravimetric profiles of the hydrochar revealed its pyrolytic reactivity to resemble lignocellulosic constituents. Fourier‐transform infrared analysis of the hydrochar showed retention of oxygen‐containing functional groups (associated with lignocellulosic constituents) from the parent feedstock. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
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