Pyrolysis of waste activated sludge from food manufacturing industry: Thermal degradation, kinetics and thermodynamics analysis

Guo, Ren Mong and Woei, William Fong Chong and Siti Aminah Mohd Nor and Ng, Jo-Han and Cheng, Tung Chong and Rubia Idris and Jingwei Too and Meng, Choung Chiong and Mohd Azman Abas (2021) Pyrolysis of waste activated sludge from food manufacturing industry: Thermal degradation, kinetics and thermodynamics analysis. Energy, 235 (121264). pp. 1-11. ISSN 0360-5442

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URL: https://www.sciencedirect.com/science/article/pii/...

Abstract

Rising environmental concern on industrial waste disposal drives the exploration of alternative managing methods. The route of waste-to-energy sparks interest as the uncontrollable amount of waste can be potentially transformed into energy-rich by-products. Waste activated sludge (WAS) from the food manufacturing industry is a novel feedstock in pyrolysis and is investigated through a thermogravimetric analyzer coupled with FTIR. During pyrolysis, a large composition of WAS is degraded within 190 e550 C, which is due to the breaking down of carbohydrates, protein and fats components. Phenols, alkanes, aromatics, acids, aldehydes, ketones and carbonyl are volatile chemicals, whereas light gases, such as CH4, CO and CO2, are produced. The kinetic analysis through model-free methods shows that the activation energy of WAS during pyrolysis increase with conversional level (Ea ¼ 68.9e693.1 kJ mol-1 for a ¼ 0.15e0.7). Polyacrylamide addition during wastewater treatment complicates the decomposition process, potentially imposing a higher Ea and consume more energy. The thermodynamic analysis of WAS demonstrated an endothermic and endergonic condition during pyrolysis where these are important information required for the designing of pyrolysis rig. From the large portion and valuable volatile composition with average activation energy, pyrolysis is found to be a feasible pathway for the management and transformation of WAS into bio-products.

Item Type:	Article
Keyword:	Biomass , Pyrolysis , TGA , Kinetics , Bioenergy , Waste activated sludge
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD1-1066 Environmental technology. Sanitary engineering > TD194-195 Environmental effects of industries and plants
Department:	FACULTY > Faculty of Science and Natural Resources
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	12 Jul 2022 08:20
Last Modified:	12 Jul 2022 08:20
URI:	https://eprints.ums.edu.my/id/eprint/33061

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