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Desalination and Water Treatment
20
14, DOI: 10.1080/19443994.2014.883196

Mathematical modeling of bio-hydrogen production from starch wastewater via up-flow anaerobic staged reactor

Mahmoud Nasr, Ahmed Tawfik, Masaaki Suzuki & Shinichi Ookawara

Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), P.O. Box 179, New Borg El Arab City, Alexandria 21934, Egypt.

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 ± 8.35gCOD/Ld and hydraulic retention time of 8h. 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±190.8mg/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 2.48LH2/d and 8.8mLH2/gCODremoved, 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 0.93gCOD/gVSS. Results showed that μmax,s increased to −0.76gCOD/Lh at F/M ratio of 0.46, and then remained relatively constant at a value of −0.68gCOD/Lh. Similar trends were observed for HPR, where it peaked (μmax,h of 93.89mLH2/h) at F/M ratio of 0.46.

Keywords: Starch wastewater, Up-flow anaerobic staged reactor, Hydrogen yield, Carbohydrate, COD


 

 

 
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