Study on the Effect of Two-Phase Anaerobic Co-Digestion of Rice Straw and Rural Sludge on Hydrogen and Methane Production

Hengjun Tang, Cheng Tang, Heng Luo, Jun Wu, Jinliang Wu (), Jian Wang, Libo Jin and Da Sun ()
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Hengjun Tang: School of Civil Engineering, Sichuan University of Light and Chemical Engineering, Zigong 643000, China
Cheng Tang: School of Architecture and Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Heng Luo: Geological Research Institute of No. 9 Oil Production Plant of CNPC Changqing Oilfield, Yinchuan 750006, China
Jun Wu: School of Civil Engineering, Sichuan University of Light and Chemical Engineering, Zigong 643000, China
Jinliang Wu: Chongqing Architectural Design Institute Co., Ltd., Chongqing 400044, China
Jian Wang: Chongqing Yubei District Ecological Environment Monitoring Station, Chongqing 401124, China
Libo Jin: State and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution, School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
Da Sun: State and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution, School of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China

Sustainability, 2023, vol. 15, issue 22, 1-11

Abstract: Hydrogen and methane, as chemical raw materials with broad application prospects in the future market, can be produced by the two-phase anaerobic co-digestion of rice straw and sludge. The study was carried out using a medium-temperature batch experiment with rice straw, a rural crop residue from Sichuan, and residual sludge from a sewage treatment station. The effect of the mixing ratio of rice straw and rural sludge on hydrogen and methane production from anaerobic digestion was investigated with a view to alleviating the energy crisis and efficient resource utilization. The experimental results showed that hydrogen production was most favorable when rice straw/sludge = 5:1, with a cumulative hydrogen yield as high as 38.59 ± 1.12 mL/g VSadded, while methane production was most favorable when 3:1, with a cumulative methane yield as high as 578.21 ± 29.19 mL/g VSadded. By calculating the energy yield, it was determined that 3:1 is more favorable for the two-phase anaerobic digestion capacity of rice straw and sludge, which is as high as 20.88 ± 1.07 kJ/g VSadded, and its conversion of hydrogen and methane is 0.75% and 78.19%, respectively. The hydrogen production pathway was dominated by the butyric acid type, whose hydrogen production phase pH (5.84 ± 0.13) was slightly higher than the optimal pH for hydrogen-producing bacteria, while the methanogenic phase could meet the optimal pH for methanogenic bacteria (6.93 ± 0.17).

Keywords: rice straw; rural sludge; two-phase anaerobic digestion; mixing ratio; hydrogen yield; methane yield (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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