Question

The term “Dark Fermentation” means
1) a method to reduce CO2in the atmosphere
2) a method to produce hydrogen as fuel from waste water
3) a method to dispose nuclear waste
4) a method to produce methane from organic waste

Answer 1

a method to produce hydrogen as fuel from waste water
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Answer 2

Answer is (4) a method to produce hydrogen as fuel from waste water

Dark fermentation produces hydrogen at relatively low yield (maximum 4H2 per glucose) with accumulation of metabolites such as VFAs.

On the other hand, the dark fermentation process is still attractive because of very high production rates and simple reactor design. In view of this, hybrid systems that add a second process to treat effluent of dark fermentation are the focus of interest of many studies. With the second process added, hybrid systems can have potentially attractive high yield of hydrogen while solving the effluent problem of dark fermentation.