Abstract：
:Fermentative H(2) production in an upflow anaerobic sludge blanket reactor (UASB) at various pH values was investigated in this study. Experimental results show that the H(2) partial pressure in biogas, H(2) production rate and H(2) yield were all pH-dependent, in the range of 0.25-0.52 atm, 42-145 ml-H(2) l(-1) h(-1) and 0.47 to 1.61 mol-H(2)mol-glucose(-1), respectively. The maximum pH for the H(2) partial pressure was observed at pH 7.50. However, the optimum H(2) production rate and H(2) yield were observed at pH 6.50-7.50. In this UASB reactor, acetate, propionate, butyrate, i-butyrate, valerate, caporate and ethanol were present in the effluent as main aqueous products, and the dominant fermentation was butyrate-type at various pHs. The metabolic pathways and thermodynamics of H(2) production were also analyzed. Both H(2) production performance and fermentation pathways in this H(2)-producing UASB reactor were significantly affected by the pH value.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zhao QB,Yu HQdoi
10.1016/j.biortech.2007.02.005subject
Has Abstractpub_date
2008-03-01 00:00:00pages
1353-8issue
5eissn
0960-8524issn
1873-2976pii
S0960-8524(07)00139-3journal_volume
99pub_type
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