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Hydrogen and electrical energy co-generation by a cooperative fermentation system comprising Clostridium and microbial fuel cell inoculated with port drainage sediment
- dos Passos, Vinícius Fabiano, Marcilio, Rafaella, Aquino-Neto, Sidney, Santana, Fabrício Butierres, Dias, Armando Cavalcante Franco, Andreote, Fenando Dini, de Andrade, Adalgisa Rodrigues, Reginatto, Valeria
- Bioresource technology 2019 v.277 pp. 94-103
- Acidaminobacter, Clostridium beijerinckii, Fusibacter, Pseudomonas, acetates, anodes, biofilm, butyrates, drainage, electric power, energy, ethanol, fermentation, genes, glucose, hydrogen, lactic acid, microbial communities, microbial fuel cells, sediments
- This research work has succeeded in recovering energy from glucose by generating H2 with the aid of a Clostridium beijerinckii strain and obtaining electrical energy from compounds present in the H2 fermentation effluent in a microbial fuel cell (MFC) seeded with native port drainage sediment. In the fermentation step, 49.5% of the initial glucose concentration (56 mmol/L) was used to produce 104 mmol/L H2; 5, 33, 3, and 1 mmol/L acetate, butyrate, lactate, and ethanol also emerged, respectively. MFC tests by feeding the anodic compartment with acetate, butyrate, lactate (individually or as a mixture), or the H2 fermentation effluent provided power density values ranging between 0.6 and 1.2 W/m2. Acetate furnished the highest power density with a nanowire-rich biofilm despite the lowest anode bacterial concentration (1012 16S gene copies/g of sediment). Non-conventional exoelectrogenic microbial communities were observed in the acetate-fed MFC; e.g., Pseudomonadaceae (Pseudomonas) and Clostridia (Acidaminobacter, Fusibacter).