Digestion performance and microbial community in full-scale methane fermentation of stillage from sweet potato-shochu production

Sweet potato shochu is a traditional Japanese spirit produced mainly in the South Kyushu area in Japan. The amount of stillage reaches approximately 8 x 105 tons per year. Wastewater mainly containing stillage from the production of sweet potato-shochu was treated thermophilically in a fullscale tre...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2014-02, Vol.26 (2), p.423-431
Main Authors: Kobayashi, Tsutomu, Tang, Yueqin, Urakami, Toyoshi, Morimura, Shigeru, Kida, Kenji
Format: Article
Language:English
Subjects:
Anaerobiosis
Bioreactors
Denaturing Gradient Gel Electrophoresis
Fermentation
Firmicutes
full-scale fixed-bed reactor
Genes, Bacterial
Ipomoea batatas
Methane - metabolism
Methanosarcina thermophila
microbial community
Microbial Consortia
RNA, Ribosomal, 16S - genetics
Solanum tuberosum
stillage treatment
thermophilic methane fermentation
Waste Disposal, Fluid
固定床反应器
微生物群落
沼气发酵
消化性能
烧酒
生产
红薯
酒糟
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Summary:Sweet potato shochu is a traditional Japanese spirit produced mainly in the South Kyushu area in Japan. The amount of stillage reaches approximately 8 x 105 tons per year. Wastewater mainly containing stillage from the production of sweet potato-shochu was treated thermophilically in a fullscale treatment plant using fixed-bed reactors （8 reactors ×283 m3）. Following the addition of Ni2＋ and Co2＋, the reactors have been stably operated for six years at a high chemical oxygen demand （COD） loading rate of 14 kg/（m3.day）. Analysis of coenzyme content and microbial communities indicated that similar microbial communities were present in the liquid phase and on the fiber carders installed in reactors. Bacteria in the phyla Firmieutes as well as Bacteroidetes were dominant bacteria, and Methanosarcina thermophila as well as Methanothermobacter crinale were dominant methanogens in the reactors. This study reveals that stillage from sweet potato-shochu production can be treated effectively in a full-scale fixed-bed reactor under thermophilic conditions with the help of Ni2~ and Co2＋. The high diversity of bacterial community and the coexistence of both aceticlastic and hydrogenotrophic methanogens contributed to the excellent fermentation performance.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(13)60423-4