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Improved Buffering Capacity and Methane Production by Anaerobic Co-Digestion of Corn Stalk and Straw Depolymerization Wastewater

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  • Fuli Yang

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

  • Wenzhe Li

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

  • Mingchao Sun

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

  • Qiang Li

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

  • Mengyi Wang

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

  • Yong Sun

    (Department of Agriculture Biological Environment and Energy Engineering, School of Engineering, Northeast Agriculture University, Harbin 150030, China)

Abstract

A new method has been developed to improve the buffer capacity and methane production of the anaerobic digestion of Corn Stalk (CS), in which both an anaerobic co-digestion of CS with Straw Depolymerization Wastewater (SDW) and a mono-digestion of CS at different substrate concentrations (25.9, 36.2 and 45.3 mg/L) were investigated. Batch assays were conducted under thermophilic conditions for 70 days, which showed that an anaerobic co-digestion significantly increased the buffering capacity and methane production of the digestion process. The lag time for methane generation resulting from an anaerobic co-digestion of CS with SDW was 10 days, while the lag time for a mono-digestion of CS was 23 days. A maximum methane production of 214.81 mL/g-VS was obtained for the anaerobic co-digestion of CS with SDW when the substrate concentration was 36.2 g/L, which was around 13.54% higher than for mono-digestion of CS of 189.20 mL/g-VS. The removal rate for sulfate increased from 10.43% to 58.40% when the substrate concentration was increased from 25.9 to 45.3 mg/L for the anaerobic co-digestion of CS with SDW. Microbial communities were analyzed using 16S rDNA sequencing technology which showed that anaerobic co-digestion of CS and SDW promotes the growth of methanogens. The relative abundance of these methanogens ( Euryarchaeota ) for the anaerobic co-digestion of CS with SDW was increased significantly, being approximately 8.25% higher than that of a mono-digestion of CS, which was at a substrate concentration of 36.2 g/L. This means that the anaerobic co-digestion of CS and SDW is beneficial for improving buffer capacity and methane production from the digestion of CS, with higher organic matter and sulfate removal rates also being obtained.

Suggested Citation

  • Fuli Yang & Wenzhe Li & Mingchao Sun & Qiang Li & Mengyi Wang & Yong Sun, 2018. "Improved Buffering Capacity and Methane Production by Anaerobic Co-Digestion of Corn Stalk and Straw Depolymerization Wastewater," Energies, MDPI, vol. 11(7), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1751-:d:156115
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    References listed on IDEAS

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    1. Yiming Gao & Xiaoying Kong & Tao Xing & Yongming Sun & Yi Zhang & Xingjian Luo & Yong Sun, 2018. "Digestion Performance and Microbial Metabolic Mechanism in Thermophilic and Mesophilic Anaerobic Digesters Exposed to Elevated Loadings of Organic Fraction of Municipal Solid Waste," Energies, MDPI, vol. 11(4), pages 1-12, April.
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    Cited by:

    1. Pengfei Li & Wenzhe Li & Mingchao Sun & Xiang Xu & Bo Zhang & Yong Sun, 2018. "Evaluation of Biochemical Methane Potential and Kinetics on the Anaerobic Digestion of Vegetable Crop Residues," Energies, MDPI, vol. 12(1), pages 1-14, December.
    2. Sohail Khan & Fuzhi Lu & Qiong Jiang & Chengjian Jiang & Muhammad Kashif & Peihong Shen, 2020. "Assessment of Multiple Anaerobic Co-Digestions and Related Microbial Community of Molasses with Rice-Alcohol Wastewater," Energies, MDPI, vol. 13(18), pages 1-16, September.

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