The Material Flow and Stability Performance of the Anaerobic Digestion of Pig Manure after (Hyper)-Thermophilic Hydrolysis Is Introduced: A Comparison with a Single-Stage Process

Min Lin, Aijie Wang, Wei Qiao (), Simon M. Wandera, Jiahao Zhang and Renjie Dong
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Min Lin: College of Engineering, China Agricultural University, Beijing 100083, China
Aijie Wang: Key Laboratory of Environmental Biotechnology, Chinese Academy of Sciences, Beijing 100085, China
Wei Qiao: College of Engineering, China Agricultural University, Beijing 100083, China
Simon M. Wandera: Department of Civil, Construction & Environmental Engineering, Jomo Kenyatta University of Agriculture & Technology, Nairobi P.O. Box 62000, Kenya
Jiahao Zhang: College of Engineering, China Agricultural University, Beijing 100083, China
Renjie Dong: College of Engineering, China Agricultural University, Beijing 100083, China

Sustainability, 2022, vol. 14, issue 23, 1-14

Abstract: Slow hydrolysis persistently affects the anaerobic digestion of animal manure. Thermophilic and hyper-thermophilic treatments introduced into a two-stage anaerobic process treating pig manure were investigated, with a single-stage mesophilic process as a control. The results from the 100-day experiment showed the thermophilic-mesophilic system had the highest removal efficiency of volatile solids at 60.8%, 18% higher than the single-stage process. The thermophilic and hyper-thermophilic hydrolysis reactors contributed 23.5% and 21.7% solubilization of chemical oxygen demand (COD), respectively. The hydrolysis efficiency achieved in the single process was 49.7%, which was lower than the hydrolysis in the two-stage processes. Approximately 60% of COD was distributed in the solid fraction in the first stage, and more than half of the particle COD continued to hydrolyze in the subsequent second stage. The mass balance of COD and volatile solids removal performance illustrated the advantages of the temperature-phased process. Comparatively, the three mesophilic reactors all had strong stability.

Keywords: anaerobic digestion; pig manure; thermophilic and hyper-thermophilic; mass balance; process stability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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