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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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    "description": "<p>The objective of this study was to enhance the hydrogen production rate of dark&nbsp;fermentation in batch operation. For the first time, the hyperthermophilic pure culture of&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 (&plusmn;11) to 654 (&plusmn;30) mL/L/h with a concomitant enhancement of the&nbsp;biomass growth and glucose consumption rate. The hydrogen yield of 2.45 (&plusmn;0.09) mol H2/&nbsp;mol glucose, the hydrogen concentration of 68% in the produced gas and the composition&nbsp;of the end products in the digestate, i.e. 62.3 (&plusmn;2.5)% acetic acid, 23.5 (&plusmn;2.9)% lactic acid and 2.3 (&plusmn;0.1)% alanine, remained unaffected at increasing biomass concentrations.</p>", 
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    "keywords": [
      "Hydrogen", 
      "Thermotoga neapolitana", 
      "Biomass concentration", 
      "Dark fermentation", 
      "Hyperthermophilic"
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    "publication_date": "2018-05-13", 
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