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Continuous biohydrogen production from diluted molasses in an anaerobic contact reactor

Frontiers of Environmental Science & Engineering in China : Volume 4

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Frontiers of Environmental Science & Engineering in China : Volume 1

Continuous biohydrogen production from diluted molasses in an anaerobic contact reactor

Content Provider	Springer Nature Link
Author	Chang, Sheng Li, Jianzheng Liu, Feng
Copyright Year	2010
Abstract	An anaerobic contact reactor (ACR) system comprising a continuous flow stirred tank reactor (CSTR) with settler to decouple the hydraulic retention time (HRT) from solids retention time (SRT) was developed for fermentative hydrogen production from diluted molasses by mixed microbial cultures. The ACR was operated at various volumetric loading rates (VLRs) of 20–44 kgCOD·m$^{−3}$·d$^{−1}$ with constant HRT of 6 h under mesophilic conditions of 35°C. The SRT was maintained at about 46–50 h in the system. At the initial VLR of 20 kgCOD·m$^{−3}$·d$^{−1}$, the hydrogen production rate dropped from 22.6 to 1.58 L·d$^{−1}$ as the hydrogen was consumed by the hydrogentrophic methanogen. After increasing the VLR to 28 kgCOD·m$^{−3}$·d$^{−1}$ and discharging the sludge for 6 consecutive times, the hydrogentrophic methanogens were eliminated, and the hydrogen content reached 36.4%. As the VLR was increased to 44 kgCOD·m$^{−3}$·d$^{−1}$, the hydrogen production rate and hydrogen yield increased to 42.1 L·d$^{−1}$ and 1.40 mol H$_{2}$·molglucose-consumed-1, respectively. The results showed that a stable ethanoltype fermentation that favored hydrogen production in the reactor was thus established with the sludge loading rate (SLR) of 2.0–2.5 kgCOD·kgMLVSS$^{−1}$·d$^{−1}$. It was found that the ethanol increased more than other liquid fermentation products, and the ethanol/acetic acid (mol/mol) ratio increased from 1.27 to 2.45 when the VLR increased from 28 to 44 kgCOD·m$^{−3}$·d$^{−1}$, whereas the hydrogen composition decreased from 40.4% to 36.4%. The results suggested that the anaerobic contact reactor was a promising bioprocess for fermentative hydrogen production.
Starting Page	140
Ending Page	148
Page Count	9
File Format	PDF
ISSN	16737415
Journal	Frontiers of Environmental Science & Engineering in China
Volume Number	5
Issue Number	1
e-ISSN	16737520
Language	English
Publisher	SP Higher Education Press
Publisher Date	2010-12-31
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	fermentative hydrogen production anaerobic contact reactor (ACR) sludge loading rate (SLR) butyric acid-type fermentation ethanol-type fermentation Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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