Fermentative hydrogen and volatile fatty acids (VFA) production from fruit wastes (FW)

Title
Fermentative hydrogen and volatile fatty acids (VFA) production from fruit wastes (FW)
Author
장성은
Alternative Author(s)
Sung-Eun Chang
Advisor(s)
전병훈
Issue Date
2018-02
Publisher
한양대학교
Degree
Master
Abstract
Hydrogen is one of the most promising future energy carriers due to its high energy content of 122-142 kJ/g. Production of hydrogen in acidogenic fermentation is favorable for the conversion of zero value residues such as organic wastes/wastewater to hydrogen. Fruit wastes (FW) are rich in organic substrates which possess a great potential for their utilization in acidogenic fermentation for hydrogen production. Production of volatile fatty acids (VFAs) during acidogenic fermentation could provide additional economic benefits. In this study, we conducted acidogenic fermentation using 5% total solid of mixed FW in fed-batch condition under mesophilic temperature for the production of hydrogen and VFAs. FW contains mostly carbohydrate (68%) in their organic matter (86%). The C/N ratio of FW (31) provided favorable condition for fermentation. The instrumental characterization such as Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) indicated the presence of fermentable carbohydrate in FW. A cumulative hydrogen production of 320 mL was observed in 32-day fermentation period. More than 90% of carbohydrate in FW was consumed by fermentative microflora to yield 138 mL hydrogen/g VS. Hydrogen productivity of 39 mL/d was observed in fermentation of FW, which led to high specific hydrogen production rate (26 mL/g VS/d). The evolution of hydrogen was accompanied with the production of VFAs during the acidogenic fermentation. Butyric acid (2.62 g/L) was the major VFA produced during the fermentation period followed by acetic acid (0.88 g/L). Utilization of these zero value FW for the enhancement in the production of hydrogen could decrease the overall production cost and reduce the amount of generated FW. Thus, acidogenic fermentation of FW would be beneficial for the industrial production of hydrogen as future energy with better waste management strategy of these type of wastes. Keywords: Fruit wastes, Hydrogen, Acidogenic fermentation
URI
http://www.dcollection.net/handler/hanyang/000000104915http://repository.hanyang.ac.kr/handle/20.500.11754/68452
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Theses (Master)
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