Effects of Bioliquid Recirculation on Hydrothermal Carbonization of Lignocellulosic Biomass

Sun-Ju Lee, Min-Ah Oh, Seung-Jin Oh, Na-Hyeon Cho, Young-Yeul Kang and Jai-Young Lee
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Sun-Ju Lee: Department of Resource Recirculation Research, National Institute of Environmental Research, Seo-gu, Incheon 22689, Korea
Min-Ah Oh: School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul 02504, Korea
Seung-Jin Oh: School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul 02504, Korea
Na-Hyeon Cho: Department of Resource Recirculation Research, National Institute of Environmental Research, Seo-gu, Incheon 22689, Korea
Young-Yeul Kang: Department of Resource Recirculation Research, National Institute of Environmental Research, Seo-gu, Incheon 22689, Korea
Jai-Young Lee: School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul 02504, Korea

Energies, 2022, vol. 15, issue 13, 1-10

Abstract: The characteristics of bioliquid produced through the hydrothermal carbonization (HTC) of wood wastes and the effects of recirculation on hydrochar production were analyzed. The organic acids and total organic carbon of bioliquid increased with progressive recirculation, whereas intermediate byproducts decreased. Hydrochar production by bioliquid recirculation increased mass yield, carbon content, caloric value, and energy yield of the former, while improving its quality as a solid refuse fuel. We concluded that bioliquid recirculation promoted HTC, as demonstrated by Fourier-transform infrared spectroscopy. Furthermore, contrary to predictions, a relatively constant quantity of bioliquid was generated in each step, indicating that its continuous reuse is feasible. Therefore, bioliquid recirculation can improve hydrochar production while simultaneously mitigating the environmental impact of wastewater generation. This method should be considered an important strategy toward the implementation of carbon-neutrality goals.

Keywords: hydrothermal carbonization; hydrochar; recirculation; bioliquid; wood waste (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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