Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 7, Pages 4095-4101Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.09.083
Keywords
Biohydrogen; Acetic acid; Fermentative coproduction; Headspace pressure
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Funding
- Special Fund for Agro-scientific Research in the Public Interest [201303099]
- National Natural Science Foundation of China [51606083]
- Natural Science Foundation of Hubei Province of China [2014CFB318]
- Fundamental Research Funds for the Central Universities of China [2662014QC003]
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Headspace pressure is a critical factor affecting hydrogen and acetic acid (HAc) generation. However, few studies have determined how to improve the coproduction of biohydrogen and HAc to increase the utilization efficiency from glucose by controlling headspace pressure. Here, we examined hydrogen and HAc coproduction by mesophilic fermentation with decreasing headspace pressures in a half -continuously running reactor. At 20 kPa, the glucose degradation rate was above 90%. HAc was the main soluble metabolite products (SMPs), with productivities of 1.74 mol/mol glucosedegradea, accounting for 93.95% of total SMPs, respectively. Maximum hydrogen productivity was 13.39 mM/d, and 70.11% of added glucose was converted into hydrogen and HAc with a total productivity of 133.72 g chemical oxygen demand/mol glucoseadded L d. Thus, hydrogen and HAc coproduction was achieved; however, homoacetogenesis was not completely inhibited by low headspace pressure, and the ratio of actual to theoretical hydrogen productivity was only 43.99%. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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