New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Behavior of Hydrogen and Organic Acids in Anaerobic Digestion of Food Wastewater

음폐수의 혐기성 소화 시 수소 및 유기산의 거동

  • Cho, Kyungmin (Department of Civil and Environmental Engineering, Hanbat University) ;
  • Oh, Saeeun (Department of Civil and Environmental Engineering, Hanbat University)
  • Received : 2022.05.09
  • Accepted : 2022.06.13
  • Published : 2022.06.25
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Abstract

In this study, we used the Flux Balance Analysis (FBA) program to examine the behavior of hydrogen and organic acids according to seasonal changes in food wastewater collected from D city. The results showed that average hydrogen conversion rates in spring, summer, autumn, and winter were 1.06, 0.71, 1.21, and 1.13 mol H2/mol of hexoseadded, respectively, indicating a significantly lower hydrogen conversion rate in summer than in other seasons. This phenomenon is believed to occur because the carbohydrate concentration of the incoming food wastewater is low. In addition, Lactobacillus, the lactic acid-producing bacterium, was 21.3% in spring, 27.2% in summer, 17.5% in autumn, and 22.6% in winter. The most distinctive feature of the microbial community in summer was that 15.3% of the Ilyobacter was analyzed. It was confirmed that Ilyobacter, which is involved in the production of acetic acid and propionic acid, is closely associated with the tendency of increasing acetic acid and propionic acid and thus contributes to organic acid change. Clostridium, a hydrogen-producing bacterium, was 76.2%, 50.8%, 78.3%, and 74%, in spring, summer, autumn, and winter, respectively. It was confirmed that Clostridium dominates the microbial community by approximately 70% or more in all seasons except summer.

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Acknowledgement

이 논문은 2021 학년도 한밭대학교 교내학술연구비의 지원을 받아 수행함.

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