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Abstract
Hydrogen production from starch wastewater industry via up-flow anaerobic staged reactor was investigated. The reactor was operated at an average organic loading rate of 13.17 ± 8.35 g COD/L d and hydraulic retention time of 8 h. The reactor achieved chemical oxygen demand (COD) and carbohydrate removal efficiencies of 84 and 92%, respectively. The total volatile fatty acids increased from 58.5 ± 30.0 (influent) to 235.6 ± 190.8 mg/L in the treated effluent, indicating that acidogenesis bacteria were dominant in the reactor. The system achieved maximum hydrogen production rate (HPR) and hydrogen yield of 2.48 L H2/d and 8.8 mL H2/g CODremoved, respectively. Simulated model tracks the experimental data with a correlation coefficient (R2 = 0.893). Maximum substrate utilization rate (μmax,s) and maximum volumetric HPR (μmax,h) were calculated at different food to micro-organisms (F/M) ratios of 0.15, 0.31, 0.46, 0.62, and 0.93 g COD/g VSS. Results showed that μmax,s increased to −0.76 g COD/L h at F/M ratio of 0.46, and then remained relatively constant at a value of −0.68 g COD/L h. Similar trends were observed for HPR, where it peaked (μmax,h of 93.89 mL H2/h) at F/M ratio of 0.46.
Acknowledgements
The first author is very grateful for Ministry of Higher Education (MOHE) of Egypt, for providing him (PhD scholarship) for this research in Egypt-Japan University of Science and Technology (E-JUST). This work is also financially by STDF (project no. 3665).