Investigations in pyrolysis kinetics of sludges of different origins: chemical sludge, biological sludge and oily sludge

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2024-06-20 DOI:10.1007/s10163-024-01997-5

Rishiraj Purkayastha, Bhaskar Jyoti Choudhury, Pinakeswar Mahanta, Akira Suami, Yoshinori Itaya, Vijayanand Suryakant Moholkar, Nobusuke Kobayashi

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Abstract

Thermochemical conversion is a possible solution for effective disposal of sludge. In this paper, we report physico-chemical characterization and pyrolysis kinetics of three sludges, viz. biological (BS), chemical (CS), and oily sludge (OS). An attempt was made to deduce the chemical composition of sludges using XPS and FTIR analysis. Pyrolysis of sludges was studied using a Thermo-Gravimetric Analyzer (TGA). The TGA data was analysed using four isoconversional models (viz. OFW, KAS, Starink and Vyazovkin_AIC) for deduction of kinetic triplet, viz. activation energy, pre-exponential factors and reaction mechanism. For all sludges, the activation energy increased with conversion. The ranges of activation energies were: BS = 87.82–303.89, CS = 72.12–200.62, OS = 67.26–130.99 kJ/mol. The ranges of pre-exponential factors were BS = 2.09E + 09 to 1.79 E + 27, CS = 2.31E + 04 to 9.72E + 13, OS = 1.20E + 06 to 5.99E + 11. s^–1. High pre-exponential factors indicated high reactivity of sludges during thermal conversion. The predominant mechanism of thermal conversion of all sludges was an order-based reaction (F1/F2/F3). This indicated homology among the components present in the organic matter in sludge. In essence, pyrolysis shows high promise as a useful pretreatment for the safe disposal of sludges of different origins.

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不同来源污泥的热解动力学研究：化学污泥、生物污泥和含油污泥

热化学转化是有效处置污泥的一种可行解决方案。本文报告了三种污泥（即生物污泥（BS）、化学污泥（CS）和含油污泥（OS））的物理化学特征和热解动力学。尝试使用 XPS 和傅立叶变换红外分析来推断污泥的化学成分。使用热重分析仪（TGA）研究了污泥的热分解。使用四种等转化模型（即 OFW、KAS、Starink 和 Vyazovkin_AIC）对 TGA 数据进行分析，以推导出动力学三要素，即活化能、预指数和反应机制。对于所有淤泥，活化能随着转化率的增加而增加。活化能的范围为BS = 87.82-303.89，CS = 72.12-200.62，OS = 67.26-130.99 kJ/mol。预指数的范围为：BS = 2.09E + 09 至 1.79E + 27，CS = 2.31E + 04 至 9.72E + 13，OS = 1.20E + 06 至 5.99E + 11。高预指数表明污泥在热转化过程中具有高反应性。所有淤泥的主要热转化机理都是基于顺序的反应（F1/F2/F3）。这表明污泥中有机物成分之间存在同源性。从本质上讲，热解作为安全处置不同来源污泥的一种有用预处理方法，前景十分广阔。

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来源期刊

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).