Thermal decomposition behaviour and kinetics of food waste and low density polyethylene during microwave copyrolysis

IF 4.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Environment, Development and Sustainability Pub Date : 2024-09-16 DOI:10.1007/s10668-024-05413-8
Shukla Neha, Neelancherry Remya
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Abstract

Microwave (MW) pyrolysis showed a promising and efficient mean of deriving energy from food waste (FW). This study evaluated the thermal decomposition characteristics of FW and commingled FW (FW mixed with low density polyethylene; LDPE (87:13)) using the thermogravimetric analyzer and the MW copyrolysis reactor. Thermograms of commingled FW (up to 892 K) using different MW susceptors (Granular Activated Carbon (GAC), Cement, Silica gel, Flyash, and Biochar) demonstrated complete devolatilization within 700–1100 s of heating time. A maximum weight reduction of 89.3 wt% was achieved for the commingle FW at 753 ± 1 K within 700 s using GAC as the MW susceptor. The MW absorptive capacity of different MW susceptors strongly influenced the thermal decomposition characteristics of FW and LDPE, and the activation energy of the MW copyrolysis; accordingly, the activation energy varied 7.01–12.03 kJ/mol with different MW susceptors. Thermal decomposition of commingled FW in MW copyrolysis could be best represented with the Kissinger–Akahira–Sunose (KAS) method (R2 = 0.85–0.95). Gibbs free energy (104.60–148.15 kJ/mol), free entropy (600.520–601.662 J/mol/K), free enthalpy (1.055–6.412 kJ/mol) showed non-spontaneity, low randomness and endothermic behaviour of the process. Overall, the low activation energy of the MW copyrolysis process (7.01 kJ/mol) achieved with the biochar as the MW susceptor showed a promising future for MW copyrolysis in developing efficient, environmental-friendly and sustainable conversion technology for commingled FW processing.

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厨余和低密度聚乙烯在微波复制分解过程中的热分解行为和动力学
微波(MW)热解是从厨余垃圾(FW)中提取能源的有效方法。本研究使用热重分析仪和微波复制分解反应器评估了厨余垃圾和混合厨余垃圾(厨余垃圾与低密度聚乙烯混合;低密度聚乙烯(87:13))的热分解特性。使用不同的水分吸收剂(颗粒活性炭 (GAC)、水泥、硅胶、粉煤灰和生物炭)对混合的 FW(最高温度为 892 K)进行的热图显示,在 700-1100 秒的加热时间内,FW 完全脱溶。使用 GAC 作为水分吸收剂,在 753 ± 1 K 的温度下,混合 FW 在 700 秒内实现了 89.3% 的最大减重。不同水分吸收剂的水分吸收能力对 FW 和 LDPE 的热分解特性以及水分复制分解的活化能有很大影响;因此,不同水分吸收剂的活化能在 7.01-12.03 kJ/mol 之间变化。基辛格-阿卡希拉-苏诺塞(KAS)法(R2 = 0.85-0.95)最能反映共混 FW 在 MW 复制分解过程中的热分解。吉布斯自由能(104.60-148.15 kJ/mol)、自由熵(600.520-601.662 J/mol/K)和自由焓(1.055-6.412 kJ/mol)显示了该过程的非自发、低随机性和内热行为。总之,以生物炭作为水分吸收剂的水分复制分解过程活化能较低(7.01 kJ/mol),这表明水分复制分解在开发高效、环保和可持续的混合废水处理转化技术方面前景广阔。
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来源期刊
Environment, Development and Sustainability
Environment, Development and Sustainability Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
10.20
自引率
6.10%
发文量
754
期刊介绍: Environment, Development and Sustainability is an international and multidisciplinary journal covering all aspects of the environmental impacts of socio-economic development. It is also concerned with the complex interactions which occur between development and environment, and its purpose is to seek ways and means for achieving sustainability in all human activities aimed at such development. The subject matter of the journal includes the following and related issues: -mutual interactions among society, development and environment, and their implications for sustainable development -technical, economic, ethical and philosophical aspects of sustainable development -global sustainability - the obstacles and ways in which they could be overcome -local and regional sustainability initiatives, their practical implementation, and relevance for use in a wider context -development and application of indicators of sustainability -development, verification, implementation and monitoring of policies for sustainable development -sustainable use of land, water, energy and biological resources in development -impacts of agriculture and forestry activities on soil and aquatic ecosystems and biodiversity -effects of energy use and global climate change on development and sustainability -impacts of population growth and human activities on food and other essential resources for development -role of national and international agencies, and of international aid and trade arrangements in sustainable development -social and cultural contexts of sustainable development -role of education and public awareness in sustainable development -role of political and economic instruments in sustainable development -shortcomings of sustainable development and its alternatives.
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