Enhancing Mesophilic Anaerobic Digestion of Waste-Activated Sludge through Heat Pretreatment and Kinetic Modeling

Jing Wang, Bing Liu (), Feiyong Chen, Yifan Li, Baojian Xu, Ruina Zhang, Rajeev Goel, Mitsuharu Terashima and Hidenari Yasui
Additional contact information
Jing Wang: School of Municipal and Environmental Engineering, Shandong Jianzhu University, 1000 Fengming Road, Jinan 250101, China
Bing Liu: Resources and Environment Innovation Institute, Shandong Jianzhu University, 1000 Fingming Road, Licheng District, Jinan 250101, China
Feiyong Chen: Resources and Environment Innovation Institute, Shandong Jianzhu University, 1000 Fingming Road, Licheng District, Jinan 250101, China
Yifan Li: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
Baojian Xu: School of Municipal and Environmental Engineering, Shandong Jianzhu University, 1000 Fengming Road, Jinan 250101, China
Ruina Zhang: Shanghai Environmental & Sanitary Engineering Design Institute Co., Ltd., No.11, 345 Lane, Shilong Road, Shanghai 200232, China
Rajeev Goel: Hydromantis Environmental Software Solutions Inc., Suite 1601, 1 James Street South, Hamilton, ON L8P4R5, Canada
Mitsuharu Terashima: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
Hidenari Yasui: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan

Sustainability, 2023, vol. 15, issue 7, 1-13

Abstract: Sewage sludge is a useful raw material for the production of renewable energy due to its stable annual output. In this study, the enhancement of mesophilic anaerobic digestion of sewage sludge through heat pretreatment at 95 °C for 30 min was tested in an anaerobic moving bed biofilm reactor (hAMBBR). The sludge retention time was set at 20, 15, 10, and 5 days during 300 days of operation and compared to a traditional anaerobic continuous stirred tank reactor (AnCSTR) without pretreatment. Results of this research indicate that the digestion ratio of volatile soluble solids in the hAMBBR process could be improved by 50%, and the average conversion ratio of methane could be increased by 45%. When the sludge retention time (SRT) was shortened to 5 days, the methane production approached twice that of the contrast reactor. The expanded anaerobic digestion model, including activated sludge models, was utilized for operation simulation. The effect of sludge retention time (SRT) shortening on volatile suspended solids (VSS) digestibility and methane production was well reproduced with simulations. The research conclusion reveals the impact of pretreatment and reactor types on anaerobic digestion and provides the scientific basis for improving methane production and process efficiency in anaerobic digestion.

Keywords: sewage sludge; anaerobic digestion; heat pretreatment; kinetic model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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