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Table 4 Experimental results of the fed-batch runs performed under several CO-feeding strategies

From: Enhancement of biohydrogen production rate in Rhodospirillum rubrum by a dynamic CO-feeding strategy using dark fermentation

CO-feeding strategy Operation time (days) Liquid phase Gas phase
Total CX (g l−1) PHB (%) (w w−1) Acetate conversion (%) Avg. production–consumption rates (mmol l−1 h−1)
CO H2 CO2
Constant (pCO = 0.60 atm) 19.8 5.35 27.6 76.6 39.2 32.3 13.4
Dynamic (from 0.1 to 0.75 atm, enriching gas flow) 10.8 4.28 24.9 91.4 29.1 27.2 15.3
Dynamic (from 0.1 to 2 atm, increasing working pressure) 13 3.95 20.8 83.2 24.3 25.1 15.4