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

Seon Young Park, Byoung Seung Jeon, Yang Mo Gu, Ji Yeon Park, Hyunook Kim, Byoung-In Sang, Eunsung Kan, Okkyoung Choi () and Jin Hyung Lee ()
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Seon Young Park: Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
Byoung Seung Jeon: Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
Yang Mo Gu: Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, Republic of Korea
Ji Yeon Park: Korea Institute of Ceramic Engineering and Technology, Cheongju 28160, 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
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

Energies, 2023, vol. 16, issue 14, 1-11

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.

Keywords: rice husk; anaerobic digestion; biochemical methane potential; methane; microbial community; pyrosequencing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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