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Enhanced fermentative hydrogen production from high-strength molasses by oyster shell conditioning: Performance and
Shoujun Zhang1, Chengqi Sun1, Guangping Guo1
1Naval Architecture and Shipping College, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching, Guangdong Ocean University, Zhanjiang 524088, China.
Abstract:
The effect of oyster shell conditioning (OS) on enhancing fermentative H2 production from high-strength molasses was investigated in comparison with that with CaCO3 conditioning (CC) and that without alkaline additives (NA). Results indicated that the H2 yield of OS (2841 mL/L) was slightly higher than that of CC (2428 mL/L), and both were significantly (p < 0.05) higher than that of NA (1702 mL/L). Moreover, OS and NA exhibited similar performance on total sugar utilization, pH, alkalinity, and liquid end products, which were significantly (p < 0.05) superior to those of NA. Compared with NA, both CC and OS presented enhanced NADH-producing pathways and suppressed NADH-consuming pathways, suggesting that more H2 might be generated via NADH oxidation. For OS, Veillonella and Kurthia might play crucial roles in the utilization of complex substrates, and magnesium and iron as key components and efficient activators of enzymes contributed positively to H2 production.
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