Pilot-scale two-phase anaerobic digestion of deoiled food waste and waste activated sludge: Effects of mixing ratios and functional analysis

Wei Jiang; Jiale Tao; Jiwu Luo; Wengang Xie; Xiaojuan Zhou; Boyi Cheng; Gang Guo; Huu Hao Ngo; Wenshan Guo; Hui Cai; Yuanyao Ye; Yiqun Chen; Ivan P Pozdnyakov

doi:10.1016/j.chemosphere.2023.138653

Pilot-scale two-phase anaerobic digestion of deoiled food waste and waste activated sludge: Effects of mixing ratios and functional analysis

Chemosphere. 2023 Jul:329:138653. doi: 10.1016/j.chemosphere.2023.138653. Epub 2023 Apr 10.

Authors

Wei Jiang¹, Jiale Tao¹, Jiwu Luo², Wengang Xie², Xiaojuan Zhou², Boyi Cheng¹, Gang Guo¹, Huu Hao Ngo³, Wenshan Guo³, Hui Cai¹, Yuanyao Ye⁴, Yiqun Chen⁵, Ivan P Pozdnyakov⁶

Affiliations

¹ School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, China.
² Central South Design and Research Institute of China Municipal Engineering Co., Ltd., Wuhan, Hubei, 430014, China.
³ Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.
⁴ School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, China. Electronic address: yeyuanyao16@hust.edu.cn.
⁵ School of Civil Engineering, Wuhan University, Wuhan, 430072, China.
⁶ V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya Str., 630090, Novosibirsk, Russian Federation; Novosibirsk State University, 2 Pirogova St., 630090, Novosibirsk, Russian Federation.

PMID: 37044139
DOI: 10.1016/j.chemosphere.2023.138653

Abstract

Anaerobic co-digestion of deoiled food waste (dFW) and waste activated sludge (WAS) can address the challenges derived from mono-digestion of FW. In the present study, a pilot-scale methanogenic bioreactor of a two-phase anaerobic digestion system was developed to explore the impact of dFW/WAS volatile solids ratios on the overall performance, microbial community, and metabolic pathways. Besides, the tech-economic of the system was analyzed. The results showed that the degradation efficiency of soluble chemical oxygen demand (SCOD) was more than 84.90% for all the dFW/WAS ratios (v/v) (1:0, 39:1, 29:1, 19:1 and 9:1). Moreover, the dominant genus of bacteria and archaea with different ratios were Lactobacillus (66.84-98.44%) and Methanosaeta (53.66-80.09%), respectively. Co-digestion of dFW and WAS (29: 1 in v/v ratios) obtained the highest yield of methane (0.41 L CH₄/L_added) with approximately 90% of SCOD being removed. In the pilot-scale experiment, the co-digestion of FW and WAS makes positive contribution to reusing solid waste for improving solid management.

Keywords: Deoiled food waste; Microbial community; Mixing ratios; Pilot scale; Waste activated sludge.

MeSH terms

Anaerobiosis
Archaea
Bioreactors
Food*
Methane
Refuse Disposal*
Sewage / microbiology

Substances

Sewage
Methane