The major obstacle of combining dark and photo fermentation for high-yield biohydrogen production is substrate inhibition while using dark fermentation effluent as the sole substrate. To solve this problem, the dark fermentation broth was diluted with different dilution ratio to improve photo-H-2 production performance of an indigenous purple non-sulfur bacterium Rhodopseudomonas palustris WP3-5. The best photo-H-2 production performance occurred at a dilution ratio of 1:2, giving a highest overall H-2 production rate of 10.72 ml/l/h and a higher overall H-2 yield of 6.14 mol H-2/mol sucrose. The maximum H-2 content was about 88.1% during the dilution ratio of 1:2. The photo-H-2 production performance was further improved by supplying yeast extract and glutamic acid as the nutrient. The results indicate that the overall H-2 production rate and H-2 yield increased to 17.02 ml/l/h and 10.25 mol H-2/mol sucrose, respectively. Using a novel solar-energy-excited optical fiber photobioreactor (SEEOFP) with supplementing tungsten filament lamp (TL) irradiation, the overall H-2 production rate was improved to 17.86 ml/l/h. Meanwhile, the power consumption by combining SEEOFP and TL was about 37.1% lower than using TL alone. This study demonstrates that using optimal light sources and proper dilution of dark fermentation effluent, the performance of photo-H-2 production can be markedly enhanced along with a reduction of power consumption. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
Fang, Herbert H. P.
Zhu, Heguang
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
Zhu, Heguang
Zhang, Tong
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
Fang, HHP
Liu, H
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
Liu, H
Zhang, T
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
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Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil
Goldemberg, J
Coelho, ST
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Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil
Coelho, ST
Lucon, O
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Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
Fang, Herbert H. P.
Zhu, Heguang
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
Zhu, Heguang
Zhang, Tong
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Univ Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Civil Engn, Ctr Environm Engn Res, Hong Kong, Hong Kong, Peoples R China
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
Fang, HHP
Liu, H
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
Liu, H
Zhang, T
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Univ Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Ctr Environm Engn Res, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China
机构:
Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil
Goldemberg, J
Coelho, ST
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Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil
Coelho, ST
Lucon, O
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Sao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, BrazilSao Paulo State Secretariat Environm, SMA SP, BR-05489090 Sao Paulo, Brazil