Simultaneous production of nutritional compounds and hydrochar from Chlorella pyrenoidosa via hydrothermal process

• Published in: Bioresource technology reports Vol. 20; p. 101245
• Main Authors: Farobie, Obie, Anis, Latifa Aisya, Fatriasari, Widya, Karimah, Azizatul, Nurcahyani, Puji Rahmawati, Rahman, Delicia Yunita, Nafisyah, Ayu Lana, Amrullah, Apip, Aziz, Muhammad
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2022
• Subjects: Antioxidant; Hydrochar; Hydrothermal; Microalgae; Nutritional Compounds; Hydrochar; Microalgae; Antioxidant; Hydrothermal; Nutritional Compounds
• ISSN: 2589-014X; 2589-014X
• DOI: 10.1016/j.biteb.2022.101245

Hydrothermal process is an eco-friendly method for simultaneously extracting antioxidant compounds and producing hydrochar. This study examined the simultaneous production of nutritional compounds and hydrochar from Chlorella pyrenoidosa via a hydrothermal process. The experiments were conducted using a batch reactor at varying temperatures (160, 180, and 200 °C) and holding times (10, 20, and 30 min). The results revealed that phenolic contents, antioxidant activity, and hydrochar production were strongly affected by both temperature and time. The highest total phenolic content (1.70 ± 0.16 mg/g) and antioxidant activity (94.2 ± 1.8 %) were found in process water at 200 °C with a holding time of 20 min. Under these conditions, a hydrochar yield of 30.79 % was obtained. Intriguingly, the hydrochar obtained at 200 °C exhibited higher heating values (24.93–28.32 MJ kg−1) than typical sub-bituminous coals, giving it potential for use as a solid fuel. [Display omitted] •Co-production of nutritional compounds and hydrochar from C. pyrenoidosa•The highest antioxidant activity (94.2 ± 1.8 %) was achieved at 200 °C.•The highest total phenolic content was obtained around 1.70 ± 0.16 mg/g.•HHVs of hydrochars were obtained in the range of 24.93–28.32 MJ kg−1.•Hydrochar showed an energy potential compared to sub-bituminous coals.