Hydrogen concentration as a possiblecontrol parameter for biogas plants

Thomas Kirner, Ellen Euchner, Bettina Manns, Thomas Frank, Marcus Kiuntke, Dieter Bryniok

Projektförderung

Figure 1: Diagram of the anaerobic digestion

Figure 2: Experimental setup with 2L-bioreactors

Figure 3: Experimental setup with 8 L-bioreactor

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FOS/

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g/L]

Versuchsdauer [d]

Stärke: Fermenter R1

Essigsäure / [mg/L] Propionsäure / [mg/L] Isobuttersäure / [mg/L]

Buttersäure / [mg/L] Isovaleriansäure / [mg/L] Valeriansäure / [mg/L]

Hexansäure / [mg/L] Ameisensäure / [mg/L] FOS/TAC-Wert

Treshold H2 partial pressureAcetoklastic methanogenesis > 10 PaHydrogenotrophic methanogenesis < 10 PaHomo-acetogenesis 52 – 95 PaPropionat oxidation > 10 PaButyrat oxidation > 100 PaEthanol and lactat oxidation 105 Pa

Figure 4:Methan production withe different substrates, in 2 l reactors

Figure 5: Fatty acids with starch as substrate in a 2 l reactor

Figure 6: Fatty acids and specific rotation with albumin and celluse as substrate

In the 8 l reactor. Specific rotation has been detected with a polarimeter from

CiS Forschungsinstitut für Mikrosensorik GmbH, Erfurt.

Figure 7: Fatty acids, hydrogen and hydrogen sulfide with albumin and celluse as substrate

In the 8 l reactor. Hydrogen and hydrogen sulfide were detected with a sensor system from

BlueSens gas sensor GmbH