Biohydrogen and biogas production from mashed and powdered vegetable residues by an enriched microflora in dark fermentation |
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Authors: | Sopee Panin Worajit Setthapun Alicia Amelia Elizabeth Sinsuw Hathaithip Sintuya Chen-Yeon Chu |
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Affiliation: | 1. Asian Development College for Community Economy and Technology, Chiang Mai Rajabhat University, Chiang Mai, 50180, Thailand;2. Ph. D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taiwan;3. Electrical Engineering Department, Fakultas Teknik, Universitas Sam Ratulangi, Manado, North Sulawesi, Indonesia;4. Institute of Green Products, Feng Chia University, Taiwan |
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Abstract: | This study conducted the utilization of vegetable residues by an enriched microflora inoculum to produce biohydrogen via anaerobic batch reactor. Dark fermentation processes were carried out with 3 kinds of vegetable residue substrates including broccoli (Brassica oleracea var. italica.), onion (Alium cepa Linn.), and sweet potato (Ipomoea batatas (L.) Lam). Vegetable wastes were pretreated into 2 forms, i.e. mashed and powdered vegetable, prior to the fermentation. The substrate used for the biohydrogen production were vegetable residues and inoculum at the vegetable residues/inoculum ratio of 1:1 (based on TS). The digestion processes were performed under 120 rpm speed of shaking bottle in the incubator with control temperature of 35?C. In this work, the maximum hydrogen production was achieved by anaerobic digestion at mashed onion with bioreactor inoculum that produced total hydrogen of 424.1 mL H2 with hydrogen yield and hydrogen concentration of 151.67 mL H2/g VSadded and 43.54%, respectively. In addition, the hydrogen production continues took only 7 days for the vegetables blended with the bioreactor inoculum. Finally, it was found that the high potential of degradation of vegetable wastes an enriched microflora in dark fermentation also showed alternative solution to eliminate agricultural wastes to produce green energy. |
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Keywords: | Biohydrogen Broccoli Onion Sweet potato Enriched microflora Anaerobic digestion |
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