High rate continuous biohydrogen production by hyperthermophilic Thermotoga neapolitana. (December 2019)

• Record Type: Journal Article
• Authors: Dreschke, Gilbert; Papirio, Stefano; Scala, Alessio; Lens, Piet N.L.; Esposito, Giovanni
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: Thermotoga neapolitana -- Hydrogen -- Continuous-flow dark fermentation -- Acetic acid -- Hydraulic retention time -- Gas recirculation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122033
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Reducing the HRT from 24 to 5 h decreased the HY and increased the HPR. The highest hydrogen yield of 3.4 mol H2 /mol glucose was obtained at an HRT of 24 h. Each HRT reduction induced a rapid HY decrease, followed by its gradual recovery. H2aq accumulated depending on the HPR reaching 15.6 (±0.7) mL/L at an HRT of 7 h. GaR prevented H2aq supersaturation achieving an HPR of 277 mL/L/h at HRT 5. Abstract: This study focused on continuous-flow hydrogen production by Thermotoga neapolitana at a hydraulic retention time (HRT) decreasing from 24 to 5 h. At each HRT reduction, the hydrogen yield (HY) immediately dropped, but recovered during prolonged cultivation at constant HRT. The final HY in each operating period decreased from 3.4 (±0.1) to 2.0 (±0.0) mol H2 /mol glucose when reducing the HRT from 24 to 7 h. Simultaneously, the hydrogen production rate (HPR) and the liquid phase hydrogen concentration (H2aq ) increased from 82 (±1) to 192 (±4) mL/L/h and from 9.1 (±0.3) to 15.6 (±0.7) mL/L, respectively. Additionally, the effluent glucose concentration increased from 2.1 (±0.1) to above 10 mM. Recirculating H2 -rich biogas prevented the supersaturation of H2aq reaching a value of 9.3 (±0.7) mL/L, resulting in complete glucose consumption and the highest HPR of 277 mL/L/h at an HRT of 5 h.