Magnetite nanoparticles enhanced glucose anaerobic fermentation for bio-hydrogen production using an expanded granular sludge bed (EGSB) reactor. (1st April 2020)

• Record Type: Journal Article
• Authors: Zhong, Dan; Li, Jinxin; Ma, Wencheng; Xin, Hongmei
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 18(2020)
• Page Start: 10664
• Page End: 10672
• Publication Date: 2020-04-01
• Subjects: Anaerobic fermentation -- Magnetite nanoparticles -- Hydrogen production -- Microbial community -- Enhanced mechanism -- EGSB reactor; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.01.095
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The feasibility and efficiency of magnetite nanoparticles (Fe3 O4 NPs) enhanced bio-hydrogen production from glucose anaerobic fermentation were evaluated in this study. The results demonstrated that the maximum hydrogen yield (HY) of 12.97 mL H2 /g-VSS was obtained with 50 mg/L and 40–60 nm of Fe3 O4 NPs in batch experiments. Moreover, the optimum dosage of Fe3 O4 NPs produced hydrogen production (HP) of 4.95 L H2 /d in an expanded granular sludge bed (EGSB) reactor. Fe3 O4 NPs involved could promote ethanol and acetic acid accumulation. Fe 2+ as by-product of iron corrosion could effectively promote the activity of key coenzymes and soluble microbial products (SMPs). Importantly, Fe3 O4 NPs addition resulted in the formation of electronic conductor chains to enhance the electron transport efficiency in the granular sludge. Microbial community analysis revealed that the relative abundance of butyrate-hydrogen-producing bacteria ( Clostridium ) decreased from 40.55% to 11.45%, while the relative abundance of ethanol-hydrogen-producing bacteria ( Acetanaerobacterium and Ethanoligenens ) increased from 19.62% to 35.35% with Fe3 O4 NPs involved, confirming that the fermentation type was transformed from butyrate-type to ethanol-type, which finally facilitated more hydrogen production. Highlights: Fe3 O4 NPs was used in glucose anaerobic fermentation by EGSB reactor. Addition of 50 mg/L and 40–60 nm Fe3 O4 NPs improved H2 production by 53.7%. Fe3 O4 NPs could enhance key coenzymes activity and electron transfer efficiency. Fe 2+ as by-product of Fe3 O4 NPs corrosion increased SMPs content effectively. Fe3 O4 NPs could facilitate ethanol-producing bacteria growth and richness.