Effect of textile waste on incineration behavior of dyeing sludge: Combustion characteristics, gas emissions, kinetics

Abstract

Co-combustion treatment of homologous solid waste is a promising direction in terms of clean and sustainable production, with this study introducing textile waste to improve the combustion performance of dyeing sludge (DS) via thermogravimetric and mass spectrometric. Results revealed that co-combustion behaviors of DS-textile waste mixtures were mainly divided into three stages (light volatile, heavy volatile and char). Among PA/PET promoted the incineration of light volatiles of DS but postponed the incineration of heavy volatiles and char. Meanwhile α-c facilitated DS incineration in whole temperature interval. The interactions between DS and PA/PET promoted heavy volatiles combustion and restrained char combustion, while that between DS and α-c presented a consistent inhibition on heavy volatiles and char combustion. The introduction of all textile waste improved combustibility, burnout performance and combustion stability of DS, especially for α-c (up to 12.6 times). H2O and CO2 were the main gas products from DS-textile wastes combustion, whose intensities were 3 or 4 orders of magnitude higher than other gas products. With PA/PET/α-c introduction, more main gas products (H2O and CO2) released from DS combustion. Meanwhile appropriate α-c obstructed SO2 release from DS combustion. PA/PET addition enhanced the activation energy of DS, while α-c lowered them. The dominant mechanism of co-incineration process were chemical reaction and heterogeneous reactions orderly.