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Enhancement of hydrogen production rate by high biomass concentrations of Thermotoga neapolitana

Dreschke, Gilbert; d'Ippolito, Giuliana; Panico, Antonio; Lens, Piet N.L.; Esposito, Giovanni; Fontana, Angelo


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        <foaf:name>Lens, Piet N.L.</foaf:name>
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    <dct:title>Enhancement of hydrogen production rate by high biomass concentrations of Thermotoga neapolitana</dct:title>
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    <dcat:keyword>Hydrogen</dcat:keyword>
    <dcat:keyword>Thermotoga neapolitana</dcat:keyword>
    <dcat:keyword>Biomass concentration</dcat:keyword>
    <dcat:keyword>Dark fermentation</dcat:keyword>
    <dcat:keyword>Hyperthermophilic</dcat:keyword>
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    <dct:description>&lt;p&gt;The objective of this study was to enhance the hydrogen production rate of dark&amp;nbsp;fermentation in batch operation. For the first time, the hyperthermophilic pure culture of&amp;nbsp;Thermotoga neapolitana cf. Capnolactica was applied at elevated biomass concentrations. The increase of the initial biomass concentration from 0.46 to 1.74 g cell dry weight/L led to a general acceleration of the fermentation process, reducing the fermentation time of 5 g glucose/L down to 3 h with a lag phase of 0.4 h. The volumetric hydrogen production rate increased from 323 (&amp;plusmn;11) to 654 (&amp;plusmn;30) mL/L/h with a concomitant enhancement of the&amp;nbsp;biomass growth and glucose consumption rate. The hydrogen yield of 2.45 (&amp;plusmn;0.09) mol H2/&amp;nbsp;mol glucose, the hydrogen concentration of 68% in the produced gas and the composition&amp;nbsp;of the end products in the digestate, i.e. 62.3 (&amp;plusmn;2.5)% acetic acid, 23.5 (&amp;plusmn;2.9)% lactic acid and 2.3 (&amp;plusmn;0.1)% alanine, remained unaffected at increasing biomass concentrations.&lt;/p&gt;</dct:description>
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