Effects of hydrothermal pretreatment and bamboo hydrochar addition on anaerobic digestion of tofu residue for biogas production

Ungyong Choe; Ahmed M Mustafa; Ximing Zhang; Kuichuan Sheng; Xuefei Zhou; Kaiying Wang

doi:10.1016/j.biortech.2021.125279

Effects of hydrothermal pretreatment and bamboo hydrochar addition on anaerobic digestion of tofu residue for biogas production

Bioresour Technol. 2021 Sep:336:125279. doi: 10.1016/j.biortech.2021.125279. Epub 2021 May 12.

Authors

Ungyong Choe¹, Ahmed M Mustafa², Ximing Zhang³, Kuichuan Sheng³, Xuefei Zhou⁴, Kaiying Wang⁵

Affiliations

¹ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Faculty of Environmental Science, University of Science, Yusheng Scientist Road, Unjong District, Pyongyang 00850, Democratic People's Republic of Korea.
² State Key Laboratory of Pollution Control and Resourses Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Department of Agricultural Engineering, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt.
³ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
⁴ State Key Laboratory of Pollution Control and Resourses Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
⁵ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China. Electronic address: zjuwky@zju.edu.cn.

PMID: 34038842
DOI: 10.1016/j.biortech.2021.125279

Abstract

The effect of hydrothermal pretreatment (HTP) of tofu residue (TR) and co-digestion of TR with hydrochar (HC) and a liquid fraction (LF) of hydrothermal pretreatment on biogas production was studied. The highest biogas and methane yield observed with the pretreated TR at HTP temperature of 140 °C reached 288 and 207 L/Kg VS, 24 and 37% above than the raw TR (control), respectively, and the highest content of methane 72%. Adding 4 g/L of HC (produced at 200 °C) enhanced the methane and biogas yield by 18 and 19% compared to untreated TR, respectively. It was found that HTP at temperature 140 °C and additive HC-200 (4 g/L) was the most efficient for biogas production from tofu residue and significantly reduced the digestion time needed from 20 to 10-13 days to reach 95% of biogas yield, which may result in substantial economic benefits.

Keywords: Anaerobic co-digestion; Biogas Production; Hydrochar; Hydrothermal pretreatment; Tofu residue.

MeSH terms

Anaerobiosis
Biofuels*
Bioreactors
Methane
Soy Foods*
Temperature

Substances

Biofuels
Methane