Performance and Energy Utilization Efficiency of an Expanded Granular Sludge Bed Reactor in the Treatment of Cassava Alcohol Wastewater

Guoqin Xu, Junlin Ji, Zhanyao Zheng, Hongchuan Song, Hong Yang, Jing Liu, Fang Yin (), Wudi Zhang and Shumei Hao ()
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Guoqin Xu: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Junlin Ji: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Zhanyao Zheng: Ningjin County Agriculture and Rural Bureau, Dezhou 253400, China
Hongchuan Song: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Hong Yang: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Jing Liu: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Fang Yin: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Wudi Zhang: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Shumei Hao: School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China

Energies, 2023, vol. 16, issue 22, 1-15

Abstract: In recent years, expanded granular sludge blanket (EGSB) reactor has been widely used in the treatment of high-concentration organic wastewater, but its research mainly focused on treatment efficiency and microbial community composition. There were few studies on the relationship of operation conditions and energy utilization efficiency. Therefore, the methanogenic characteristics and energy utilization efficiency of EGSB reactor were studied by using cassava alcohol wastewater (CAW) as a raw material at (36 ± 1) °C. The results show that the degradation of volatile fatty acids (VFAs) is an important step affecting methane generation compared to the hydrolysis stage. When organic load rate (OLR) was 12.73 gCOD/L·d, the chemical oxygen demand (COD) removal rate was above 95%, the methane production efficiency of raw material was 202.73 mLCH 4 / gCOD·d, the four-stage conversion efficiency was the highest, and the energy utilization efficiency was 62.26%, which was the optimal stage for EGSB reactor to treat CAW. These findings support high-efficiency bioenergy recovery from CAW in practice and highlight the potential wide application of high-performance anaerobic reactors for CAW.

Keywords: EGSB; energy utilization efficiency; methane production; volatile fatty acids (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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