Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 205, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2019.112373
Keywords
Microalgae; Hydrothermal treatment; Biohydrogen; Biomethane; Microbial metabolism; Energy recovery
Categories
Funding
- National Natural Science Foundation of China [51561145013]
- Beijing Daily Industry Innovation Team [BAIC06-2019]
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This study was the first attempt to investigate the effect of hydrothermal treatment on energy recovery of Chlorella sp. via two-stage anaerobic fermentation (TSAF). A maximum biohydrogen yield of 8.29 +/- 0.33 mLH(2)/gVS was achieved at the control group (CG), and a highest biomethane yield of 434.38 +/- 5.72 mLCH(4)/gVS was obtained for the group at the weakest hydrothermal treatment severity (HTS) (2.49). Compared with CG, the energy recovery was increased by 12.78% for the group at HTS 2.49, reduced by 6.05% and 32.09% for groups at HTS 4.06 and 5.21, respectively. Compared to single anaerobic digestion, TSAF significantly increased the energy recovery by 22.23-146.78%. 5-HMF and furfural were degraded by 17.65-71.08% and 46.58-82.20%, respectively, after first-stage biohydrogen fermentation. The analysis of microbial structure revealed that Peptococcaceae and Desulfovibrio related to inhibitors degradation were enriched with increasing HTS during first-stage fermentation. During the second-stage biomethane fermentation, the family Enterobacteriaceae was reduced as a symbiosis with hydrogenotrophic methanogens, accompanied with a decrease of Methanobacteriaceae. In comparison, the family Methanosaetaceae and Methanosarcinaceae belonging to acetoclastic methanogens, were remarkably increased due to the VFAs-rich effluents.
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