Biohythane production from marine macroalgae Sargassum sp. coupling dark fermentation and anaerobic digestion

• Autor(a) principal: Costa, J. C.
• Data de Publicação: 2015
• Outros Autores: Oliveira, J. V., Pereira, M. A., Alves, M. M., Abreu, A. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/35367
• topic: Biohythane; Marine Biomass; Sargassum sp; Biohydrogen; Anaerobic digestion; Caldicellulosiruptor sacharolyticus; Caldicellulosiruptor saccharolyticus; Ciências Naturais::Ciências Biológicas; Engenharia e Tecnologia::Biotecnologia Industrial; Science & Technology

Potential biohythane production from Sargassum sp. was evaluated in a two stage process. In the first stage, hydrogen dark fermentation was performed by Caldicellulosiruptor saccharolyticus. Sargassum sp. concentrations (VS) of 2.5, 4.9 and 7.4 g L−1 and initial inoculum concentrations (CDW) of 0.04 and 0.09 g L−1 of C. saccharolyticus were used in substrate/inoculum ratios ranging from 28 to 123. The end products from hydrogen production process were subsequently used for biogas production. The highest hydrogen and methane production yields, 91.3 ± 3.3 L kg−1 and 541 ± 10 L kg−1, respectively, were achieved with 2.5 g L−1 of Sargassum sp. (VS) and 0.09 g L−1of inoculum (CDW). The biogas produced contained 14–20% of hydrogen. Potential energy production from Sargassum sp. in two stage process was estimated in 242 GJ ha−1 yr−1. A maximum energy supply of 600 EJ yr−1 could be obtained from the ocean potential area for macroalgae production. The highest hydrogen and methane production yields, 91.3±3.3 L kg-1 and 541±10 L kg-1, respectively, were achieved with 2.5 g L-1 of Sargassum sp. (VS) and 0.09 g L-1of inoculum (CDW). The biogas produced contained 14 to 20% of hydrogen. Potential energy production from Sargassum sp. in two stage process was estimated in 242 GJ ha-1yr-1. A maximum energy supply of 600 EJ yr-1 could be obtained from the ocean potential area for macroalgae production.