Fig. 5From: In situ carbon dioxide capture to co-produce 1,3-propanediol, biohydrogen and micro-nano calcium carbonate from crude glycerol by Clostridium butyricumConductivities of fermentation broths under different CO2 capture scenarios. NaOH represents 5Â M NaOH solution; Ca(OH)2 represents 5Â M Ca(OH)2 suspension; In the ammonium hydroxide group, ammonium hydroxide acted as an inorganic nitrogen source and, otherwise, (NH4)2SO4 acted as an inorganic nitrogen sourceBack to article page