Effect of pH in fermentation of vegetable kitchen wastes on hydrogen production under a thermophilic condition

A series of tests on the fermentation of vegetable kitchen wastes to produce hydrogen were conducted at pHs of 5.5, 6.0, 6.5, and 7.0 under a thermophilic condition. Microorganisms used in fermentation were enriched from kitchen-waste composts, and a high vegetable-content kitchen-waste was utilized...

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Published inInternational journal of hydrogen energy Vol. 33; no. 19; pp. 5234 - 5241
Main Authors Lee, Ze-Kun, Li, Shiue-Lin, Lin, Jian-Sheng, Wang, Yu-Hsuan, Kuo, Pei-Chen, Cheng, Sheng-Shung
Format Journal Article Conference Proceeding
LanguageEnglish
Published Kidlington Elsevier Ltd 01.10.2008
Elsevier
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Summary:A series of tests on the fermentation of vegetable kitchen wastes to produce hydrogen were conducted at pHs of 5.5, 6.0, 6.5, and 7.0 under a thermophilic condition. Microorganisms used in fermentation were enriched from kitchen-waste composts, and a high vegetable-content kitchen-waste was utilized. The initial substrate to microorganism ratio was kept at 10 g COD/g VSS under a thermophilic (55 °C) condition. A maximum specific hydrogen production rate of 0.48 mmol H 2/g VSS/h was achieved at pH = 6.0, and the highest hydrogen yield of 0.57 mmol H 2/g COD occurred at pH = 7.0. No hydrogen production occurred at pH = 5.5. At pHs controlled at 6.0, 6.5, and 7.0, the major volatile acid produced was butyrate. Using a terminal restriction fragment length polymorphism (TRFLP) analysis for microbial identification, T-RFs of 227 bps were found to be a dominant population when hydrogen was produced efficiently at pHs of 6.0, 6.5, and 7.0.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2008.05.006