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Applicability of Rice Husk Residue Generated by the Silica Extraction Process to Anaerobic Digestion for Methane Production

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  • Seon Young Park

    (Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
    Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea
    These authors contributed equally to this work.)

  • Byoung Seung Jeon

    (Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
    These authors contributed equally to this work.)

  • Yang Mo Gu

    (Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
    Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea)

  • Ji Yeon Park

    (Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
    Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea)

  • Hyunook Kim

    (Department of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea)

  • Byoung-In Sang

    (Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea)

  • Eunsung Kan

    (Texas A&M AgriLife Research Center, Stephenville, TX 76401, USA
    Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
    Department of Wildlife, Sustainability, and Ecosystem Sciences, Tarleton State University, Stephenville, TX 76401, USA)

  • Okkyoung Choi

    (Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea)

  • Jin Hyung Lee

    (Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea)

Abstract

Rice husks are a feedstock of biogenic silica because of their high silica content. After silica extraction, a solid residue comprising mostly carbohydrates is present. Solid residue valorization is important for closed-loop systems using rice husk and has minimal negative environmental impacts. In this study, we used solid rice husk that was generated by silica extractionto anaerobic digestion for producing biomethane. The rice husk residue was characterized in terms of total solids, volatile solids, pH, composition, and particle size. Changing the characteristics increased biogas production by 2.48-fold compared to that of raw rice husk. The residue produced 166.4 mL-biogas g −1 vs. and 100.4 mL CH 4 g −1 VS, much more than previously reported. Microbial community analysis, which was conducted to investigate the biological reasons for increased biogas and methane, found increased Bacteroidetes levels in the rice husk samples. Among archaeal communities, Bathyarchaeota was more abundant in all rice husk samples than in the inoculum. The rice husk residue contained more operational taxonomic units than other samples. These changes in the microbial community significantly influenced the anaerobic digestion of the rice husk residue and improved methane production. Our findings provide a basis for the cleaner utilization of rice husk residue to produce renewable energy.

Suggested Citation

  • Seon Young Park & Byoung Seung Jeon & Yang Mo Gu & Ji Yeon Park & Hyunook Kim & Byoung-In Sang & Eunsung Kan & Okkyoung Choi & Jin Hyung Lee, 2023. "Applicability of Rice Husk Residue Generated by the Silica Extraction Process to Anaerobic Digestion for Methane Production," Energies, MDPI, vol. 16(14), pages 1-11, July.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5415-:d:1195452
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    References listed on IDEAS

    as
    1. Zhang, Yalei & Chen, Xiaohua & Gu, Yu & Zhou, Xuefei, 2015. "A physicochemical method for increasing methane production from rice straw: Extrusion combined with alkali pretreatment," Applied Energy, Elsevier, vol. 160(C), pages 39-48.
    2. Jinyoung Chun & Jin Hyung Lee, 2020. "Recent Progress on the Development of Engineered Silica Particles Derived from Rice Husk," Sustainability, MDPI, vol. 12(24), pages 1-19, December.
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