Co-hydrothermal carbonization of tobacco stems assisted by activated carbon from coal-gasification fine slag: Efficient wastewater purification and enhanced combustion performance of co-hydrochar

文献类型： 外文期刊

第一作者： Guo, Shuai

作者： Guo, Shuai;Wang, Xuhai;Gao, Long;Zhao, Chenchen;Li, Xingcan;Song, Dean

作者机构：

关键词： Coal gasification fine slag activated carbon; Tobacco stems; Hydrothermal wastewater purification; Combustion performance

期刊名称：ENERGY （ 影响因子：9.4； 五年影响因子：8.8 ）

ISSN： 0360-5442

年卷期： 2025 年 331 卷

页码：

收录情况： SCI

摘要： This study proposes an integrated co-hydrothermal carbonization (co-HTC) strategy for simultaneously purifying hydrothermal wastewater and improving the combustion performance of co-hydrochar by co-processing tobacco stems (TSs) with chemically activated coal-gasification fine slag (CAC). TSs, a major agricultural residue, generate large volumes of organic-rich wastewater during HTC, while CAC exhibits high porosity and adsorption potential. The co-HTC was performed at 250 degrees C and 300 degrees C under varying TS: CAC mass ratios (1:0-1:3). At 250 degrees C and a TS:CAC ratio of 1:3, COD and TOC values declined from 18,144 mg/L and 8,686 mg/L to 10,383 mg/L and 4,350 mg/L, respectively, achieving removal rates of 42.78 % and 49.92 %. At 300 degrees C, the removal rates remained above 42 %, despite forming more low-molecular-weight organics. CAC promoted pore development in co-hydrochar, while dichloromethane extraction exposed additional micropores and cracks, enhancing surface reactivity. The introduction of CAC reduced aliphatic and carbonyl groups in both the hydrochar and the bio-oil phases, suggesting CAC's dual role in adsorbing unstable intermediates and catalyzing aromatization. Combustion characterization showed that with increasing CAC ratio, the burnout temperature of hydrochar increased by 40 degrees C (from 689 degrees C to 729 degrees C), while the flammability index and combustion stability index decreased. Dichloromethane extraction improved ignition temperature, maximum combustion rate temperature, and combustion uniformity by 20-45 degrees C, confirming enhanced reactivity after removal of secondary char. In conclusion, co-HTC of TSs and CAC offers a sustainable route for the integrated treatment of agricultural and industrial residues, providing both wastewater remediation and high-quality carbon materials. Optimization of operating conditions is essential to balance purification efficiency and fuel quality.

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