Co-pyrolysis characters between combustible solid waste and paper mill sludge by TG-FTIR and Py-GC/MS

Highlights: • Contents of nine possible products for mixture pyrolysis were analyzed via Py-GCMS. • Adding CSW could increase the pyrolysis performance of PMS. • The evolution of ten typical pyrolysis products were illustrated by TG-FTIR. • The amount of pollutants reached the minimum with the ratio of 50% PMS. - Abstract: In this work, the types of products and their proportions, the evolution characteristics of the functional groups and gases products, the pollutants emission of combustible solid waste (CSW), paper mill sludge (PMS) and their blends were investigated by Py-GC/MS and TG-FTIR. For the blends, the proportions of PMS were 10%, 30% and 50%. The percentage of pyrolysis products (acid, hydrocarbon, aldehyde, alcohol, benzene, furan, phenol, ester and ketone) was pointed out. Among these, the content of acid was the maximum. Blended with 10% PMS, the percentage of alcohol reached the greatest. Both single sample and blends could be divided into two decomposition phases. The residue mass of blends increased from 17.74% to 30.47% with the PMS ratio increased. O−H, C−H, C=O, C−O, SO₂, NO, HCl, CO, CH₄ and CO₂ were the main functional groups and gases products surveyed from the FTIR spectrums during co-pyrolysis. Adding PMS into CSW could reduce the emission of the pollutants and the lowest yield of pollutants (SO₂, NO, HCl, CO and CO₂) would be obtained covered with 50% PMS.