Performance of two-temperature and dual-phase dry anaerobic digestion of corn straw and pig manure

JIANG Chenguang; SHI Yan; ZHANG Jingqian; LI Ning; SI Hang; MU Lan

doi:10.13205/j.hjgc.202510017

Volume 43 Issue 10

Oct. 2025

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JIANG Chenguang, SHI Yan, ZHANG Jingqian, LI Ning, SI Hang, MU Lan. Performance of two-temperature and dual-phase dry anaerobic digestion of corn straw and pig manure[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(10): 150-161. doi: 10.13205/j.hjgc.202510017

Citation:

JIANG Chenguang, SHI Yan, ZHANG Jingqian, LI Ning, SI Hang, MU Lan. Performance of two-temperature and dual-phase dry anaerobic digestion of corn straw and pig manure[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(10): 150-161. doi: 10.13205/j.hjgc.202510017

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Performance of two-temperature and dual-phase dry anaerobic digestion of corn straw and pig manure

doi: 10.13205/j.hjgc.202510017

1. College of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China;
2. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China;
3. School of Environmental Science & Engineering, Tianjin University, Tianjin 300350, China;
4. Metener Company, Helsinki 41310, Finland

Received Date: 2024-08-21
Accepted Date: 2024-10-10
Rev Recd Date: 2024-09-15

Available Online: 2025-12-03

Publish Date: 2025-10-01

Abstract

Abstract

Anaerobic digestion is a process whereby a range of microorganisms convert biodegradable substrates into biogas under anaerobic conditions. Despite the prevalence of full-mixed single-phase anaerobic digestion as a dominant process in anaerobic digestion， its operating efficiency is typically low. The dual-phase anaerobic digestion process can maintain stable operation at high load， leading to a resurgence of interest in recent years. However， compared to single-phase anaerobic digestion， its constructional investment cost is higher. Consequently， the development of a cost-effective operational strategy for dual-phase anaerobic digestion represents a crucial step toward ensuring the stable operation and profitability of biogas plants. In this study， the effects of acid-phase insulation on the gas production characteristics of dry anaerobic digestion， organic matter degradation， and the structure of the microbial community， as well as the energy balance of the four fermentation systems， were investigated using corn straw and swine manure as the raw materials in integrated and separated dual-phase anaerobic fermentation systems， respectively. The findings indicated that， the fully insulated systems exhibited a maximum methane production potential of 147.9 mL/gVS and 152.2 mL/gVS， respectively， in the integrated and separated dual-phase anaerobic fermentation system. In comparison， the uninsulated acid phase system demonstrated a methane production potential of 145.6 mL/gVS and 144.5 mL/gVS， respectively， in the integnated and seperated systems. No significant difference was observed in methane yield between the four systems. During the operation of the two fully insulated systems， the highest SCOD concentrations in the biogas slurry were 16.3 g/L and 26.2 g/L， and the highest VFAs concentrations were 12.0 g/L and 11.1 g/L. While the two acid-phase uninsulated systems exhibited the highest SCOD concentrations of 18.9 g/L and 19.1 g/L， the highest VFAs concentrations were 14.2 g/L and 8.1 g/L. In terms of energy balance， the operating energy consumption of the fully insulated system represented 29.3% and 59.2% of the total production capacity， whereas， for the acid phase uninsulated system， it accounted for 11.0% and 32.0% of the total system capacity. In conclusion， while the acid phase uninsulated system demonstrated comparable methane production to the fully insulated system， it exhibited a greater net energy output. The findings of this study can serve as a reference for the construction and operation of two-temperature and dual-phase anaerobic digestion biogas projects.
- corn straw,
- two-phase anaerobic fermentation,
- energy loss,
- microbiological analysis,
- energy balancing analysis

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References(54)

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