초록
<P><B>Abstract</B></P> <P>Hydrogen production from mesophilic anaerobic co-digestion of food waste (FW) and crude glycerol (GLC) was investigated in this study. Batch experiments were carried out at 35 °C for 36 h to assess the effect of supplementation of different glycerol concentrations (1%, 3% and 5% (v/v)) on dark fermentation of FW. The maximum hydrogen yield (180 mLH<SUB>2</SUB>/gVS) was obtained at 5% GLC while the maximum specific production rate (around 13 mLH<SUB>2</SUB>/(gVS.h)) was similar for all experiments with glycerol addition. Besides contributing to increase H<SUB>2</SUB> productivity, the presence of glycerol reduced the microorganisms acclimation time (Lag phase) in comparison to the control tests conducted without this co-substrate. In addition, the increment of glycerol concentration also enhanced volatile fatty acids generation and favoured the production of 1,3-propanediol (1,3-PDO). In the experimental conditions studied (i.e., 1–5% (v/v) of GLC), the results revealed that co-digestion of FW and GLC is promising and can be potentially used to maximize energy production while contributing to the management and treatment of these wastes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-digestion of food waste and glycerol (1–5% v/v) for H<SUB>2</SUB> generation was assessed. </LI> <LI> Highest H<SUB>2</SUB> yields were obtained at 3% (175 mL/gVS) and 5% (180 mL/gVS) glycerol. </LI> <LI> At higher glycerol content, H<SUB>2</SUB> and 1,3-propanediol were simultaneously produced. </LI> <LI> Lag phase of fermentative organisms was reduced in the presence of glycerol. </LI> <LI> Co-digestion of food waste and glycerol is promising to maximize energy production. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>