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  • effect of temperature on continuous fermentative lactic acid (la) production and bacterial community, and development of la-producing uasb reactor

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 641
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a frequently used fermentation manner in lactic acid (la) production, batch fermentation by pure cultures, has a limited practicability: low volumetric productivity and high energy consumption. in this study, continuous la fermentation was performed in a completely stirred tank reactor at 12 h hrt, inoculated with anaerobic digester sludge. glucose (25 g cod/l) was used as a feedstock and temperature was increased from 35 to 60 °c. la production significantly increased from 50 °c, which was negligible up to 45 °c, with obvious bacterial community change. at 50 and 55 °c, la production was maximized, reaching 23 g cod/l, corresponding to 92% la conversion efficiency. pyrosequencing analysis showed that microbial diversity was simplified at 50–60 °c, and the sequences closely related with bacillus coagulans became predominant, followed by lactobacillus fermentum. an la-producing upflow ananerobic sludge blanket reactor was successfully developed, which enhanced the productivity up to 4.8 g la/l/h by shortening hrt to 4 h.

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