BioChem - DOS

Co-digestion of untreated macro and microalgal biomass for biohydrogen production: Impact of inoculum augmentation and microbial insights

International journal of hydrogen energy

Sivagurunathan, Periyasamy; Kumar, Gopalakrishnan; Kobayashi, Takuro; Xu, Kaiqin; Kim, Sang-Hyoun; Nguyen, Dinh Duc; Chang, Soon Woong

<P>This study assessed the co-digestion of macro and microalgal biomass towards the improvement of hydrogen production. The red macroalgal biomass (Gelidium amansii) and green mixed microalgal biomass was mixed in a ratio of 8:2, with an initial substrate concentration of 10 g/L, and various amount of inoculum addition range from 3 to 15% (v/v) was evaluated to assess the feasible substrate to inoculum ratio for the effective co-digestion of the algal biomass. The results showed that the co-digestion with 6% inoculum addition provided the peak hydrogen yield of 45 mL/g dry biomass added with a high hydrogen content of 24% in the gas phase. The other tested conditions showed moderate hydrogen content in the range of 17-22%, respectively. These results suggest that anaerobic co-digestion of macro and microalgal biomass, with appropriate initial biomass loading (6%) is essential for enhanced hydrogen production. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>

2018

Elsevier

0360-3199

1879-3487

43

25

pp.11484-11492

10.1016/j.ijhydene.2018.02.193

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART85088096

Algal biofuels; Microalgae; Macroalgae; Co-digestion; Hydrogen; Mixed culture