Pyrolysis of predried dyeing sludge: Weight loss characteristics, surface morphology, functional groups and kinetic analysis

Abstract

The weight loss characteristics, surface morphology, functional group, and kinetic parameters of predried dyeing sludge (PDS) pyrolysis was studied for the first time in this paper. The contents of both volatile matter and organic matter in PDS char both decreased with the increase of pyrolysis temperature. The PDS pyrolysis process can be divided into four stages: S 1 (30 C-180 C)-water evaporation, S 2 (180 C-500 C)-decomposition of organic compounds such as aliphatic compounds and biomass fibres, S 3 (500 C-900 C)-decomposition of the former stage residues, and S 4 (900 C-1350 C)-decomposition of carbonaceous material remaining in the char and vaporization of partial ash. With the increase