Abstract：
:Acidogenic fermentation is an anaerobic process of double purpose, while treating organic residues it produces chemical compounds, such as hydrogen, ethanol and organic acids. Therefore, acidogenic fermentation arises as an attractive biotechnology process towards the biorefinery concept. Moreover, this process does not need sterile operating conditions and works under a wide range of pH. Changes of operating conditions produce metabolic shifts, inducing variability on acidogenic product yield. To induce those changes, experiments, based on reactor headspace N(2)-flushing (gas phase), were designed. A major result was the hydrogen yield increase from 1 to 3.25±0.4 ( [Formula: see text] ) at pH 4.5 and N(2)-flushing of 58.4 (L·d(-1)). This yield is close to the theoretical acidogenic value (4 [Formula: see text] ). The mechanisms that explain this increase on hydrogen yield shifts are related to the thermodynamics of three metabolic reactions: lactate hydrogenase, NADH hydrogenase and homoacetogenesis, which are affected by the low hydrogen partial pressures.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Bastidas-Oyanedel JR,Mohd-Zaki Z,Zeng RJ,Bernet N,Pratt S,Steyer JP,Batstone DJdoi
10.1016/j.biortech.2012.01.122subject
Has Abstractpub_date
2012-04-01 00:00:00pages
503-9eissn
0960-8524issn
1873-2976pii
S0960-8524(12)00146-0journal_volume
110pub_type
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