Evaluation of operational parameters in thermophilic acid fermentation of kitchen waste |
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Authors: | Yong-Jin Park Hiroshi Tsuno Taira Hidaka Ji-Hoon Cheon |
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Institution: | (1) Department of Urban and Environmental Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan |
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Abstract: | In this study, the effect of operational parameters, such as solids retention time (SRT), pH, and substrate total solids (TS)
concentration, on acid fermentation efficiency was investigated. From batch tests, it was shown that the appropriate pH range
for thermophilic acidogens was around 6–7 and that the optimum pH condition was 6. From the continuous experiment, pH and
SRT were shown to be the most important operational parameters for solubilization and organic acid production. In contrast,
TS concentration did not show any obvious effect on chromium chemical oxygen demand (CODcr) solubilization when TS was in
the range 3.5%–10%. The optimum operational conditions for thermophilic acid fermentation were an SRT of 2 days and a pH of
6.
This research was carried as a part of the CREST project of Japan Science and Technology Agency. |
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Keywords: | Acid fermentation Kitchen waste Thermophilic Organic acids Solubilization pH Gasification |
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