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Kinetics, thermodynamics, gas evolution and empirical optimization of (co-)combustion performances of spent mushroom substrate and textile dyeing sludge

Huang, Jianli, Liu, Jingyong, Kuo, Jiahong, Xie, Wuming, Zhang, Xiaochun, Chang, Kenlin, Buyukada, Musa, Evrendilek, Fatih
Bioresource technology 2019 v.280 pp. 313-324
activation energy, catalytic activity, combustion, dyes, emissions, energy, fabrics, ferric oxide, hydrogen cyanide, models, nitric oxide, nitrogen dioxide, response surface methodology, sludge, spent mushroom compost, sulfur dioxide, temperature, thermal stability, thermogravimetry
Spent mushroom substrate (SMS) and textile dyeing sludge (TDS) were (co-)combusted in changing heating rates, blend ratios and temperature. The increased blend ratio improved the ignition, burnout and comprehensive combustion indices. A comparison of theoretical and experimental thermogravimetric curves pointed to significant interactions between 350 and 600 °C. High content of Fe₂O₃ in TDS ash may act as catalysis at a high temperature. Ignition activation energy was lower for TDS than SMS due to its low thermal stability. 40% SMS appeared to be the optimal blend ratio that significantly decreased the activation energy, as was verified by the response surface methodology. D3 model best described the (co-)combustions. SMS led to more NO and NO₂ emissions at about 300 °C and less HCN emission than did TDS. The addition of 40% SMS to TDS lowered SO₂ emission. The co-combustion of TDS and SMS appeared to enhance energy generation and emission reduction.