초록
<P><B>Abstract</B></P> <P>Practically, before being fed to the treatment plant, food waste (FW) is stored for up to a week in a storage tank under ambient temperature condition, which would have an impact on the bioenergy yield. In the present work, FW was stored at different temperatures (5 °C, 20 °C, and 35 °C) for 0 d, 1 d, and 2 d, and it was used as a feedstock for mesophilic H<SUB>2</SUB> fermentation. H<SUB>2</SUB> production curves were divided by three groups, finally attaining 1.7–1.8 mol H<SUB>2</SUB>/mol hexose<SUB>added</SUB>, 1.4–1.5 mol H<SUB>2</SUB>/mol hexose<SUB>added</SUB>, and 1.2 mol H<SUB>2</SUB>/mol hexose<SUB>added</SUB>, achieved from the (fresh, FW stored at 5 °C), (FW stored at 20 °C, and 35 °C for 1 d), and (FW stored at 35 °C for 2 d), respectively. The different performance was attributed to the growth of indigenous lactic acid bacteria such as <I>Lactobacillus</I> and <I>Weissella</I> during storage under high temperature condition. In addition, it was found that the activity of homoacetogenic reaction (R17, 4H<SUB>2</SUB> + CO<SUB>2</SUB> → Acetate) calculated by establishing metabolic flux balance was different depending on the H<SUB>2</SUB> production performance. The flux of R17 ranged 0.03–0.06 under low H<SUB>2</SUB> yield achieved conditions, while it increased to 0.10–0.17 those showing low H<SUB>2</SUB> yields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of food waste storage condition on hydrogen fermentation. </LI> <LI> No detrimental effect when food waste was stored at 5 °C. </LI> <LI> Drop of H<SUB>2</SUB> yield by 20–30% when food waste was stored at 20 °C and 35 °C. </LI> <LI> Growth of indigenous lactic acid bacteria under high temperature condition. </LI> <LI> Homoacetogenic reaction increased where low performance was achieved. </LI> </UL> </P>