This paper elucidates catalytic and non-catalytic pyrolysis characteristics of sludge obtained from the biological treatment of textile and leather industrial wastewater. Iso-conversional model-free methods, such as Flynn–Wall–Ozawa (FWO), Kissinger–Akahira–Sunose (KAS) and Friedman, were employed to evaluate the kinetic and thermodynamic parameters. The \({E}_{a}\) (activation energy) values of non-catalytic and catalytic pyrolysis with y-zeolite and activated alumina (Al₂O₃) were determined via KAS method to be in the range of 84.66–291.18, 73.12–197.17 and 84.66–217.44 kJ/mol, respectively, whereas similar trends were observed when the other two methods were used. Gas chromatography/mass spectrometer (GC/MS) analyses showed that the oil obtained from the non-catalytic procedure was rich in fatty acids, steroidal compounds and N-compounds. Activated alumina was effective in removing nitrogen-containing compounds from the oil while y-zeolite promoted deoxygenation and deacidification reactions and, as a result, the oil became rich in alkanes and alkenes which improved its quality as a fuel.

Graphical abstract

中文翻译：

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纺织和皮革工业废水产生的工业污泥的热降解动力学和催化热解研究

本文阐述了纺织和皮革工业废水生物处理污泥的催化和非催化热解特性。采用等转换无模型方法，如 Flynn-Wall-Ozawa (FWO)、Kissinger-Akahira-Sunose (KAS) 和弗里德曼，用于评估动力学和热力学参数。_{y-沸石和活性氧化铝（Al 2} O ₃ ）的非催化和催化热解的\（{E}_{a}\）（活化能）值) 通过 KAS 方法测定分别在 84.66-291.18、73.12-197.17 和 84.66-217.44 kJ/mol 的范围内，而使用其他两种方法时观察到类似的趋势。气相色谱/质谱 (GC/MS) 分析表明，从非催化过程中获得的油富含脂肪酸、甾族化合物和 N-化合物。活性氧化铝可有效去除油中的含氮化合物，而 y-沸石则促进脱氧和脱酸反应，因此油中富含烷烃和烯烃，从而提高了其作为燃料的质量。

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