Operating experiences of a continuous biohydrogen reactor

Today, hydrogen is produced mainly by steam reformation of fossile fuels like natural gas or oil. But only hydrogen produced by renewable sources is really a clean energy. So one possibility for hydrogen production is the biological fermentation of biogenous wastes by hydrogen producing bacteria. For the experimental setup four 30-L-volume reactors were constructed for continuous biohydrogen production. As inoculum, heat-treated sludge of a wastewater treatment plant was used. A hydraulic retention time (HRT) of 40 hours was tested and an organic loading rate (OLR) of 2-10 kg VS/m3*d. As starting substrate, waste sugar medium was used. The pH and other parameters were observed to find boundary conditions for a stable continuous process with a minimum of online-control measurements.The high concentration of organic acids in the reactor led to a very low pH, which was controlled manually and online > 4 up to 5.5, otherwise the biohydrogen production decreased rapidly. The gas amount varied with the different OLRs, but could be stabilised on a high level as well as the hydrogen concentration in the gas with 44-52 %. No methane was detected in the gas. It turned out, that continuous biohydrogen production with stable gas amounts and qualities could be achieved at different operation conditions.The results showed, that the start up and operation of a continuous biohydrogen reactor have to be observed very carefully to ensure a constant gas production, and that pH-control ensured stable operation conditions.

 

 

Stand der Pumpspeicher in Deutschland 2025
© Springer Vieweg | Springer Fachmedien Wiesbaden GmbH (12/2025)
Infolge des Ausbaus der Stromerzeugung aus erneuerbaren Energien ist ein erhöhter Speicherbedarf im Stromverbundnetz notwendig. Hierdurch steigt die Bedeutung von Pumpspeichern als bis auf weiteres einzige Möglichkeit für eine großmaßstäbliche Stromspeicherung.

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© Springer Vieweg | Springer Fachmedien Wiesbaden GmbH (12/2025)
Die Genehmigungsverfahren sind sehr komplex sowie mit hohen Kosten und rechtlichen Unsicherheiten verbunden und dauern oftmals mehr als zehn Jahre.

Revitalisierung des Pumpspeicherwerks Happurg - Sanierung des Oberbeckens
© Springer Vieweg | Springer Fachmedien Wiesbaden GmbH (12/2025)
Im Rahmen der Revitalisierung des Pumpspeicherwerks Happurg haben im September 2024 auch die Arbeiten zur Sanierung des zugehörigen Oberbeckens begonnen.

 

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