文献类型：期刊文献

英文题名：Comparative performance of two upflow anaerobic biohydrogen-producing reactors seeded with different sludges

作者：Wang, Yi[1,2]; Mu, Yang[1]; Yu, Han-Qing[1,2]

机构：[1]Univ Sci & Technol China, Sch Chem, Hefei 230026, Anhui, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2007

卷号：32

期号：8

起止页码：1086

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20072110615985);WOS:【SCI-EXPANDED(收录号:WOS:000247500900020)】；

语种：英文

外文关键词：acidogenesis; H-2 production; pH; upflow anaerobic sludge blanket (UASB)

摘要：Comparisons were made between the performance of two upflow anaerobic biohydrogen-producing reactors. One reactor (R1) was seeded with methanogenic sludge, but was operated at low pH levels, whereas another (R2) was seeded with heat-pretreated sludge. Experiment results showed that H-2 partial pressure in biogas, H-2 production rate and H-2 yield were pH-dependent in the two reactors. The optimum pH for H-2 partial pressure was observed at pH 3.10 for R1 and 4.00 for R2, respectively. The optimum pH for maximum H-2 production rate and H-2 yield was 4.00 for both R1 and R2. Acetate, propionate, butyrate, i-butyrate, valerate, caproate and ethanol were main aqueous products and their distribution was also significantly influenced by pH. For R1, caproate was dominant at pH < 4.00 and the butyrate-type fermentation predominated at pH 4.5-6.0. For R2, butyrate was dominant at pH > 3.60, while the ethanol-type fermentation was important at pH < 3.60. With a thermodynamic analysis, possible metabolic pathways for the formation of caproate and valerate in both reactors were suggested. (C) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.