液相循环对制糖固废共水热碳化影响机制研究

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Abstract The study utilized filter mud and bagasse as raw materials for the co-hydrothermal carbonization process at 240℃-60min-5:1. The primary objective of this study was to investigate the impact of liquid-phase cycling on the solid-liquid phase products of the co-hydrothermal carbonization process and to elucidate the reaction pathways. The experimental findings demonstrated that liquid-phase cycling significantly enhanced the reaction process of co-hydrothermal carbonization, resulting in substantial improvements in the hydrochar properties. In the liquid-phase cycling process, there was a substantial increase in the hydrochar yield and higher heating value (HHV), accompanied by a significant decrease in ash content and an increase in microsphere structures on the surface. Following the second cycling, the hydrochar obtained a maximum specific surface area of 31.2m²/g, and the contents of the groups CHX, C-C/C=C, and -C/OR/-C-NR exhibited a tendency to increase, while the contents of C=O/C=N and -COOR decreased significantly; In the liquid-phase products, the contents of organic acids and ketones increased. Concurrently, the proportion of aromatic compounds remarkably rose from 0.31% to 13.75%, and hydrocarbons, amides, and esters decreased. Within the liquid-phase cycle, the acidic environment generated by the accumulation of organic acids served as a catalyst for hydrolysis and other reactions, and simultaneously facilitated the Maillard reaction, which effectively enhanced the degree of aromatization of the hydrochar. Moreover, it was beneficial for fortifying the oxygen-containing functional groups on the surface of the hydrothermal carbon, thereby creating more chemically active sites. Consequently, the hydrochar was bestowed with enhanced adsorption capabilities and its potential for land application was elevated.

Key words： liquid phase recycling co-hydrothermal carbonization hydrochar filter mud bagasse

Received: 05 August 2024

PACS:

X705

Corresponding Authors: 唐兴颖,讲师,tangxingying@gxu.edu.cn E-mail: tangxingying@gxu.edu.cn

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	CHEN Si-si
	XUE Yu-yang
	TANG Xing-ying
	WANG Zhi-jie
	ZHANG Ying-ying
	QIAN Li-li
	LI Shang-ze
	WANG Ying-hui

Cite this article:

CHEN Si-si,XUE Yu-yang,TANG Xing-ying等. Study on the mechanism of liquid-phase cycling on the co-hydrothermal carbonation of sugar solid waste[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1364-1374.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1364

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