Effects of pre-treatment and biological acidification on fermentative hydrogen and methane co-production
메타 데이터
바이오화학분류
바이오정밀화학
연료
논문
Effects of pre-treatment and biological acidification on fermentative hydrogen and methane co-production
학술지
Energy conversion and management
저자명
Sun, Chihe; Xia, Ao; Fu, Qian; Huang, Yun; Lin, Richen; Murphy, Jerry D.
초록
<P><B>Abstract</B></P> <P>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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synergistic effects of pre-treatment and bio-acidification were assessed. </LI> <LI> Hydrothermal acid pre-treatment was benefical for biological acidification. </LI> <LI> Increasing bio-acidification time increased acetic acid production. </LI> <LI> Bio-acidification decreased lag-phase time whilst improving methane production. </LI> <LI> 144 h bio-acidification achieved maximum energy conversion efficiency of 64%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>