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Long-term effect of inoculum pretreatment on fermentative hydrogen production by repeated batch cultivations: Homoacetogenesis and methanogenesis as competitors to hydrogen production

Luo, Gang ; Karakashev, Dimitar ; Xie, Li ; Zhou, Qi ; Angelidaki, Irini

Biotechnology and bioengineering, 2011-08, Vol.108 (8), p.1816-1827 [Periódico revisado por pares]

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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Título:
Long-term effect of inoculum pretreatment on fermentative hydrogen production by repeated batch cultivations: Homoacetogenesis and methanogenesis as competitors to hydrogen production
Autor: Luo, Gang ; Karakashev, Dimitar ; Xie, Li ; Zhou, Qi ; Angelidaki, Irini
Assuntos: Acetates - metabolism ; Bacteria ; Biofuel production ; Biological and medical sciences ; Biotechnology ; Clostridium butyricum - drug effects ; Clostridium butyricum - growth & development ; Clostridium butyricum - metabolism ; Clostridium butyricum - radiation effects ; Cultivation ; Energy ; Fermentation ; Fundamental and applied biological sciences. Psychology ; Glucose - metabolism ; homoacetogenesis ; Hydrogen ; Hydrogen - metabolism ; Hydrogen production ; Hydrogen-Ion Concentration ; Industrial applications and implications. Economical aspects ; Inoculum ; inoculum pretreatment ; Methane - metabolism ; methanogenesis ; Methods. Procedures. Technologies ; Microbial engineering. Fermentation and microbial culture technology ; Microorganisms ; Organisms ; Pretreatment ; Temperature ; Thermoanaerobacterium - drug effects ; Thermoanaerobacterium - growth & development ; Thermoanaerobacterium - metabolism ; Thermoanaerobacterium - radiation effects
É parte de: Biotechnology and bioengineering, 2011-08, Vol.108 (8), p.1816-1827
Notas: Foundation of The State Key Laboratory of Pollution Control and Resource Reuse, China - No. PCRRK09004
China Scholarship Council
ark:/67375/WNG-TZN44V29-9
Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation
ArticleID:BIT23122
Danish Agency for Science, Technology and Innovation under Bio REF - No. 2104-06-0004
istex:43A107196ED79D598675AF4473CA5B53401590C0
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Long‐term effects of inoculum pretreatments (heat, acid, loading‐shock) on hydrogen production from glucose under different temperatures (37°C, 55°C) and initial pH (7 and 5.5) were studied by repeated batch cultivations. Results obtained showed that it was necessary to investigate the long‐term effect of inoculum pretreatment on hydrogen production since pretreatments may just temporarily inhibit the hydrogen consuming processes. After long‐term cultivation, pretreated inocula did not enhance hydrogen production compared to untreated inocula under mesophilic conditions (initial pH 7 and pH 5.5) and thermophilic conditions (initial pH 7). However, pretreatment could inhibit lactate production and lead to higher hydrogen yield under thermophilic conditions at initial pH 5.5. The results further demonstrated that inoculum pretreatment could not permanently inhibit either methanogenesis or homoacetogenesis, and methanogenesis and homoacetogenesis could only be inhibited by proper control of fermentation pH and temperature. Methanogenic activity could be inhibited at pH lower than 6, both under mesophilic and thermophilic conditions, while homoacetogenic activity could only be inhibited under thermophilic condition at initial pH 5.5. Microbial community analysis showed that pretreatment did not affect the dominant bacteria. The dominant bacteria were Clostridium butyricum related organisms under mesophilic condition (initial pH 7 and 5.5), Thermoanaerobacterium sp. related organisms under thermophilic condition (initial pH 7), and Thermoanaerobacterium thermosaccharolyticum related organisms under thermophilic condition (initial pH 5.5). Results from this study clearly indicated that the long‐term effects of inoculum pretreatments on hydrogen production, methanogenesis, homoacetogenesis and dominant bacteria were dependent on fermentation temperature and pH. Biotechnol. Bioeng. 2011; 108:1816–1827. © 2011 Wiley Periodicals, Inc.
Editor: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Idioma: Inglês

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Long-term effect of inoculum pretreatment on fermentative hydrogen production by repeated batch cultivations: Homoacetogenesis and methanogenesis as competitors to hydrogen production

Luo, Gang ; Karakashev, Dimitar ; Xie, Li ; Zhou, Qi ; Angelidaki, Irini

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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