Fig. 2
From: Microwave-assisted organic acids and green hydrogen production during mixed culture fermentation
Application of heat shocks to optimise hydrogen productivity: different concentrations of substrate (sucrose) and different pre-treatments (oven and microwave) were compared. A Maximal gas productivity and B the highest hydrogen production were reached with a substrate concentration of 50Â g/l and pretreated with oven heat shock. All fermentations were performed at least 5 times. C The highest hydrogen efficiency was achieved with 50Â g/l sucrose in both microwave and oven experiments. D Gas composition depending on the feeding amount and pre-treatment. The median values were linked to a trend line to better visualise the effects of the different substrate concentrations