Effect of hydrothermal carbonization under CO<sub>2</sub> atmosphere during domestic waste gasification

Hong Nam Nguyen; Thu Phuong Nguyen; Phuong Thu Le; Thi Mai Thanh Dinh

doi:10.15625/2525-2518/22022

Author affiliations

Authors

Hong Nam Nguyen University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Nghia Do Ward, Ha Noi, Viet Nam
Thu Phuong Nguyen University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0002-6066-5712
Phuong Thu Le University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0003-1801-8308
Thi Mai Thanh Dinh University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0002-2400-102X

DOI:

https://doi.org/10.15625/2525-2518/22022

Keywords:

domestic waste, hydrothermal carbonization, gasification

Abstract

Handling domestic waste with high moisture content and heterogeneity for energy purposes is a challenge that needs to be addressed for sustainable development. This study examines the effect of hydrothermal carbonization (HTC) of waste under a CO₂ atmosphere, followed by high-temperature steam gasification. The waste underwent HTC at 250 °C in a 100 % CO₂ atmosphere, with a waste-to-water ratio of 1:5 and a residence time of 120 minutes. The resulting hydrochar was then used as feedstock for steam gasification at 900 °C under 100 % steam, and the results were compared with that obtained with untreated waste in the same gasification conditions. The findings reveal improvements in bulk density, fixed carbon content, and higher heating value of the hydrochar compared to the original waste. The syngas produced from hydrochar contained higher H₂ and CO concentrations (measured by GC analyzer), exceeding 3 % for conventional HTC and 5 % for HTC under CO₂. Furthermore, the higher stability in syngas composition was also observed for both HTC samples. These results suggest the potential for more efficient and sustainable waste-to-energy conversion.

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