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Hydrochar production from watermelon peel by hydrothermal carbonization
Xuejiao Chen1, Qimei Lin1, Ruidong He1
1Department of Soil and Water Science, College of Resources and Environment, China Agricultural University, Beijing 100193, China.
Bioresource Technology
|June 2, 2017
Summary
Hydrothermal carbonization of watermelon peel waste produced hydrochar and nutrient-rich spent liquor. Hydrochar properties changed with temperature and time, showing increased aromaticity but potential soil risks.
Area of Science:
- Biomass conversion
- Waste valorization
- Hydrothermal carbonization
Background:
- Watermelon peel is a significant agricultural waste.
- Valorization of biomass waste is crucial for sustainable practices.
Purpose of the Study:
- To investigate the hydrothermal carbonization of watermelon peel waste.
- To characterize the resulting hydrochar and spent liquor.
- To assess the potential applications and environmental risks.
Main Methods:
- Hydrothermal carbonization at 190°C and 260°C for 1h, 6h, and 12h.
- Analysis of hydrochar and spent liquor properties.
- Chemical characterization of carbon structures.
Main Results:
- Hydrochar yield ranged from 2-5% (fresh matter) and 46-95% (dry matter).
- Lower temperatures favored higher conversion efficiency.
- Hydrochar exhibited increased aromaticity and C/N ratio, with potential toxic compounds.
- Spent liquor was rich in nutrients, suitable for fertilizer.
Conclusions:
- Hydrothermal carbonization effectively converts watermelon peel waste into hydrochar and nutrient-rich liquor.
- Hydrochar characteristics are tunable by process conditions, but environmental risks need consideration.
- Spent liquor shows promise as a biofertilizer, warranting further soil application studies.
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