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

1
Clean Fuel Laboratory, Korea Institute of Energy Research (KIER), 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
2
Department of Chemical & Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
3
Advanced Materials and Devices Laboratory, Korea Institute of Energy Research (KIER), 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
4
Energy Saving Laboratory, Korea Institute of Energy Research (KIER), 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
5
Dongwon Heavy Industries Co., Ltd., Jeongoksandan 7-gil, Seosin-myeon, Hwaseong 18554, Korea
*
Authors to whom correspondence should be addressed.
Ju-Hyoung Park and Min-Ho Jin contributed equally to this work.
Energies 2019, 12(16), 3072; https://doi.org/10.3390/en12163072
Received: 10 July 2019 / Revised: 4 August 2019 / Accepted: 7 August 2019 / Published: 9 August 2019
(This article belongs to the Section Sustainable Energy)
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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 °C accompanied by torrefaction at 250 °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. View Full-Text
Keywords: sewage sludge; biomass; lignocellulose; lignin; upgrading fuel sewage sludge; biomass; lignocellulose; lignin; upgrading fuel
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Park, J.-H.; Jin, M.-H.; Lee, Y.-J.; Song, G.-S.; Choi, J.W.; Lee, D.-W.; Choi, Y.-C.; Park, S.-J.; Song, K.H.; Kim, J.-G. Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects. Energies 2019, 12, 3072.

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