Production of microalgal biochar and reducing sugar using wet torrefaction with microwave-assisted heating and acid hydrolysis pretreatment by Yu, Kai Ling, Chen, Wei Hsin, Sheen, Herng Kuang, Chang, Jo-Shu, Lin, Chih Sheng, Ong, Hwai Chyuan, Show, Pau Loke, Ng, Eng Poh, Ling, Tau Chuan