Zhou Jun, Yu Mingjie, Qu Jianhua, Akindolie Modupe Sarah, Bi Fuxuan, Liu Yang, Jiang Zhao, Wang Lei, Zhang Bo, Zhang Ying
College of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin, 150030, China.
Heilongjiang Research Academy of Environmental Science, Harbin, 150056, China.
Environ Sci Pollut Res Int. 2022 Dec;29(56):85300-85311. doi: 10.1007/s11356-022-21740-7. Epub 2022 Jul 6.
Hydrothermal carbonization of alfalfa is a potential way to reuse agricultural waste. However, the effects of hydrothermal conditions on the properties of alfalfa-derived hydrochar are not clear. Herein, this study investigated the impact of different synthesis conditions (e.g., heating temperature, heating time, and solid to liquid ratio) on the formation and properties of hydrochar. Characterization and thermogravimetric analysis results revealed that with the increase of hydrothermal temperature and the extension of time, cellulose in alfalfa broken down more completely, and the number of carbon spheres and the aromatization degree increased, while the functional groups decreased. Furthermore, there was a surge in the carbon content, fixed carbon yield, high heating value, reduced oxygen, and volatile content. Additionally, the enhancement solid-liquid ratio could effectively improve the energy and mass yields. In all, by adjusting the process parameters of hydrochar, cleaner and higher productivity products could be obtained. This study provides theory basis for the production of target hydrochar that is used to soil amendments, adsorbents, and energy sources in the future.
苜蓿的水热碳化是一种再利用农业废弃物的潜在方式。然而，水热条件对苜蓿衍生的生物炭性能的影响尚不清楚。在此，本研究考察了不同合成条件（如加热温度、加热时间和固液比）对生物炭形成及性能的影响。表征和热重分析结果表明，随着水热温度的升高和时间的延长，苜蓿中的纤维素分解得更彻底，碳球数量和芳构化程度增加，而官能团减少。此外，碳含量、固定碳产率、高热值、氧含量降低以及挥发物含量均有所增加。另外，提高固液比可有效提高能量和质量产率。总之，通过调整生物炭的工艺参数，可获得更清洁、更高产率的产品。本研究为未来生产用于土壤改良剂、吸附剂和能源的目标生物炭提供了理论依据。
