College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.
School of Energy and Power Engineering, North University of China, Taiyuan, 030051, China.
J Environ Manage. 2023 Nov 1;345:118819. doi: 10.1016/j.jenvman.2023.118819. Epub 2023 Aug 17.
The use of seawater as a substitute for pure water as supplemental moisture raises questions about its effect on the physicochemical properties of hydrochar. Therefore, this study aimed to investigate the feasibility of using seawater as supplemental moisture by comparing the physicochemical properties of products obtained through Co-hydrothermal carbonization of chicken manure and cornstalk under seawater and deionized water conditions. By varying the HTC temperature and blending ratios of CM and CS to investigate comprehensively the effect of seawater. Results indicated that the hydrochar yield experienced a variation from 54.54% to 57.40%, while the IC value changed from 7.69% to 8.46% as the ratio of CM:CS shifted from 3:1 to 1:3 under seawater conditions. The higher heating value of the hydrochars obtained under seawater conditions was lower than those obtained under deionized water conditions. This suggests that seawater conditions promote the hydrolysis reaction of organic solid waste. Furthermore, it was observed that when no lignin hydrolysis reaction occurred, seawater conditions had no discernible effect on the fuel quality of the hydrochar. However, at an HTC temperature of 250 °C, the fuel quality of the hydrochar obtained under seawater conditions was notably inferior to that of the hydrochar obtained under deionized water. Thus, an HTC temperature lower than 250 °C is necessary for the hydrothermal carbonization of organic solid waste under seawater conditions. Moreover, the relative content of surface -C-(C, H)/CC of the hydrochar obtained under seawater conditions was lower than that obtained under deionized water conditions, indicating that the hydrochar had a low degree of aromatization. Additionally, there was a significant increase in the immobilized Mg atoms in the hydrochar under seawater conditions, which affected the hydrochar yield and higher heating value of the hydrochar. This research presents a theoretical foundation for preparing solid fuels and materials using hydrothermal carbonization of saltwater as supplemental moisture.
将海水用作补充水分的替代物，引起了人们对其对水热炭理化性质影响的关注。因此，本研究旨在通过比较鸡粪和玉米秸秆在海水和去离子水条件下协同水热碳化产物的理化性质，来探讨使用海水作为补充水分的可行性。通过改变 HTC 温度和 CM 与 CS 的混合比例，全面研究海水的影响。结果表明，在海水条件下，水炭产率从 54.54%变化到 57.40%，而 IC 值从 7.69%变化到 8.46%，当 CM:CS 比从 3:1 变为 1:3 时。在海水条件下获得的水炭的高位发热值低于在去离子水条件下获得的水炭。这表明海水条件促进了有机固体废弃物的水解反应。此外，当没有木质素水解反应发生时，海水条件对水炭的燃料质量没有明显影响。然而，在 HTC 温度为 250°C 时，在海水条件下获得的水炭的燃料质量明显劣于在去离子水条件下获得的水炭。因此，在海水条件下进行有机固体废弃物的水热碳化需要低于 250°C 的 HTC 温度。此外，在海水条件下获得的水炭的表面 -C-(C, H)/CC 的相对含量低于在去离子水条件下获得的水炭，表明水炭的芳香化程度较低。此外，在海水条件下，水炭中固定的 Mg 原子数量显著增加，这影响了水炭的产率和高位发热值。本研究为利用海水水热碳化作为补充水分制备固体燃料和材料提供了理论基础。
