Enhanced hydrogen fermentation by zero valent iron addition. (4th February 2019)

• Record Type: Journal Article
• Authors: Hwang, Yuhoon; Sivagurunathan, Periyasamy; Lee, Mo-Kwon; Yun, Yeo-Myeong; Song, Young-Chae; Kim, Dong-Hoon
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 6(2019)
• Page Start: 3387
• Page End: 3394
• Publication Date: 2019-02-04
• Subjects: Hydrogen fermentation -- Zero valent iron -- Substrate concentration -- Organic acids; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.06.015
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, zero valent iron (ZVI) was applied to enhance hydrogen fermentation (H2 ). Glucose was used as a substrate at various concentrations of 5–40 g COD/L, and ZVI concentration was adjusted at 0–10 g/L. Without ZVI addition, H2 yield decreased as substrate concentration increased, due to organic acids accumulation as substrate concentration increased. At low substrate concentration of 5 g COD/L, there was a slight increase of H2 yield from 1.4 to 1.5 mol H2 /mol glucose added by ZVI addition. However, the increment was substantial at higher substrate range. For example, H2 yield increased from 0.9 to 1.2–1.5 mol H2 /mol hexoseadded by ZVI addition at 20 g COD/L. The results indicated that ZVI may create a more favorable environment for anaerobic microbial acidogenesis with providing buffering effect to prevent pH drop due to produced hydroxyl ions as it dissolved. These changes of environmental conditions also brought differences on organic acids profile and microbial community, and those may affect to overall H2 fermentation performances. Highlights: Investigate the effect of ZVI on the dark fermentative hydrogen production. H2 yield and production rate were increased up to 54% and 72%, respectively. pH decrease was well prevented by buffering effect of ZVI. Organic acid production was significantly enhanced with favorable composition.