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Effects of pre-treatment and biological acidification on fermentative hydrogen and methane co-production
Murphy, Jerry D.
A sequential two-stage process comprising biological acidification followed by anaerobic digestion was proposed to enhance gaseous biofuel production from the mixture of rice residue and micro-algae after thermo-chemicial hydrolysis. The maximum specific hydrogen yield of 223.1 ± 8.8 mL/g volatile solids (VS) and production rate of 10.4 ± 0.4 mL/g VS/h were achieved from hydrothermal acid pre-treated biomass during biological acidification. Increase in hydraulic retention time of biological acidification from 12 to 144 h significantly affected the distribution of solubilised metabolic products and led to improved biological acidification rates (BARs) from 15.5% to 78.5%. Compared with single stage anaerobic digestion, the first stage acidification phase led to reductions in the lag-phase time and peak time of anaerobic digestion in such a two-stage process. The maximum specific methane production rate of 2.2 ± 0.03 mL/g VS/h was achieved with a deep acidification of 144 h yielding a BAR of 78.5%. Increasing the length of time in biological acidification from 12 to 144 h contributed to improved energy conversion efficiency of 25.4%–64% after 120 h of anaerobic digestion. These results demonstrate that biological acidification is feasible to improve bioenergy recovery in two-stage fermentation.
Fermentation , Hydraulic retention time , Biological acidification , Biomethane , Algae , Food waste
Sun, C., Xia, A., Fu, Q., Huang, Y., Lin, R. and Murphy, J. D. (2019) 'Effects of pre-treatment and biological acidification on fermentative hydrogen and methane co-production', Energy Conversion and Management, 185, pp. 431-441. doi:10.1016/j.enconman.2019.01.118