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Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects

Authors
Park, Ju-HyoungJin, Min-HoLee, Young-JooSong, Gyu-SeobChoi, Jong WonLee, Dong-WookChoi, Young-ChanPark, Se-JoonSong, Kwang HoKim, Joeng-Geun
Issue Date
2-8월-2019
Publisher
MDPI
Keywords
sewage sludge; biomass; lignocellulose; lignin; upgrading fuel
Citation
ENERGIES, v.12, no.16
Indexed
SCIE
SCOPUS
Journal Title
ENERGIES
Volume
12
Number
16
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/63568
DOI
10.3390/en12163072
ISSN
1996-1073
Abstract
Developing effective, economical, and environmentally sound approaches for sewage sludge management remains an important global issue. In this paper, we propose a bioethanol-lignin (nonfood biomass)-based sewage sludge upgrading process for enhancing the heating value and reducing air pollutants of hybrid sewage sludge fuel (HSF) for the effective management of sewage sludge. Sewage sludge paste with the lignin-CaO solution implies drying at 105 degrees C accompanied by torrefaction at 250 degrees C. During torrefaction, moisture and partly volatile matter begin to evaporate, and are almost vaporized out to the surface. In this study, the proposed process enhances the net caloric value (NCV) to 37%. The lignin-embedded HSF shows a two-in-one combustion peak regardless of the mixing ratio, resulting in a 70% reduction of unburned carbon (UBC) emissions, which is one of the particular matter (PM) sources of combustion flue gas. Other air pollutants, such as CO, hydrocarbon, NOx, and SOx, were also reduced by the proposed process. In particular, SOx emission remained at 1 ppm (average value) regardless of the sulfur content of the fuel.
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