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Co-hydrothermally carbonized sewage sludge and lignocellulosic biomass An efficiently renewable solid fuel
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Document Title
Co-hydrothermally carbonized sewage sludge and lignocellulosic biomass An efficiently renewable solid fuel
Author
Piboonudomkarn S. Khemthong P. Youngjan S. Wantala K. Tanboonchuy V. Lubphoo Y. Khunphonoi R.
Affiliations
Department of Environmental Engineering Khon Kaen University Khon Kaen 40002 Thailand; National Nanotechnology Center (NANOTEC) National Science and Technology Development Agency (NSTDA) Pathumthani Klong Luang 12120 Thailand; Department of Chemical Engineering Faculty of Engineering Khon Kaen University Khon Kaen 40002 Thailand; Department of Industrial Piping Technology Faculty of Technical Education Rajamangala University of Technology Isan Khon Kaen Campus Khon Kaen 40000 Thailand; Research Center for Environmental and Hazardous Substance Management (EHSM) Faculty of Engineering Khon Kaen University Khon Kaen 40002 Thailand
Type
Article
Source Title
Arabian Journal of Chemistry
ISSN
18785352
Year
2023
Volume
16
Issue
12
Open Access
All Open Access Gold
Publisher
Elsevier B.V.
DOI
10.1016/j.arabjc.2023.105315
Abstract
The objectives of this investigation were to elucidate the potential use of metal oxide-rich sewage sludge obtained from the treated brewery wastewater into a value-added solid fuel via co-hydrothermal carbonization process (co-HTC). Two residue biomass including spent coffee grounds and bagasse were supplied as co-combustion. The effects of sewage sludge and biomass addition on fuel properties were evaluated to optimize the best condition for biocoal-liked production. The chemical composition and mineral phase of solid product were further analyzed. Combustion kinetics analysis including activation energy (E) and pre-exponential factor (A) were derived from thermogravimetric analysis. It was found that the addition of coffee grounds and bagasse enhanced the fuel properties of the solid products remarkably increasing high heating value (HHV) along with a low ash content providing an increased fuel ratio of 0.34 � 1.01 and higher HHV as 14.29 � 22.19 MJ/kg. The highest rate of energy recovery was achieved when combining 75 wt% sewage sludge with 25 wt% spent coffee grounds. A substantial decrease of H/C and O/C atomic ratios was distinguished after bagasse addition compared to commercial lignite coal. It was also noticed that the relationship between the sewage sludge and biomass feedstocks during co-HTC is synergistic by increasing the amount of oxidative carbon during the char combustion stage and enhancing the degree of thermal stability. Moreover it was also emphasized that during co-HTC some carbon and inorganic contents of sludge and lignocellulosic biomass were partially transferred into a liquid phase confirmed by TOC and ICP-OES analyses. A heavy metal leaching toxicity in a liquid product was also determined according to the USA-EPA standard. The combustion reactivity was improved especially combustion reactivity of the biomass-sewage sludge-derived hydrochar. Interestingly the hydrochar product was anticipated to possess enhanced safety and stability. Moreover the co-combustion of hydrochar and coal improved the devolatilization properties and ignition of coal. This strategy revealed that co-hydrothermal process with biomass is a prospective approach to increase the value-added of sewage sludge feedstock as bicoal-like solid fuel. ? 2023 The Author(s)
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
License
CC BY-NC-ND
Rights
Authors
Publication Source
Scopus