Study on the mechanism of liquid-phase cycling on the co-hydrothermal carbonation of sugar solid waste
CHEN Si-si1, XUE Yu-yang1, TANG Xing-ying2, WANG Zhi-jie1, ZHANG Ying-ying2, QIAN Li-li3, LI Shang-ze1, WANG Ying-hui2,4
1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 2. Guangxi Laboratory on the Study of Coral Reefs in the South China Sea/Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning 530004, China; 3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212000, China; 4. Guangxi Institute of Green and Low Carbon Technology Co, Ltd, Nanning 530022, China
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.
陈思思, 薛宇阳, 唐兴颖, 王智洁, 张莹莹, 钱黎黎, 李尚泽, 王英辉. 液相循环对制糖固废共水热碳化影响机制研究[J]. 中国环境科学, 2025, 45(3): 1364-1374.
CHEN Si-si, XUE Yu-yang, TANG Xing-ying, WANG Zhi-jie, ZHANG Ying-ying, QIAN Li-li, LI Shang-ze, WANG Ying-hui. Study on the mechanism of liquid-phase cycling on the co-hydrothermal carbonation of sugar solid waste. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1364-1374.
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