BioChem - DOS

Sustainable biohythane production from algal bloom biomass through two-stage fermentation: Impacts of the physicochemical characteristics and fermentation performance

International journal of hydrogen energy

Chen, Cheng; Sun, Chihe; Xia, Ao; Liao, Qiang; Guo, Xiaobo; Huang, Yun; Fu, Qian; Zhu, Xianqing; Zhu, Xun

<P><B>Abstract</B></P> <P>Algal bloom biomass, sourced from a freshwater lake in Chongqing, was pre-treated by hydrothermal pre-treatments with or without acid/alkali catalysts, and subsequently used as a substrate for sustainable biohythane production via fermentation. Fourier transform infrared (FTIR) spectroscopy analyses suggested hydrothermal acid/alkali pre-treatments significantly changed peak intensities of chemical compositions in algal bloom biomass. Derivative thermogravimetric (DTG) analyses showed more macromolecular substances hydrolysed after hydrothermal acid/alkali pre-treatments. When bloom algae were pre-treated with 1% HCl at 140 &deg;C for 10 min, an optimal specific hydrogen yield (SHY) of 39.4 mL/g volatile solid (VS) was obtained, which is 38.2% higher than raw biomass. However, a 34.4% decrease in SHY occurred under hydrothermal pre-treatment with 1% NaOH due to the enhancement of Maillard reaction. When using the effluents in methane fermentation, specific methane yields (SMYs) were 177.1&ndash;276.8 mL/g VS. Two-stage process effectively reduced the total fermentation time by 22.7% compared with single-stage fermentation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bloom algae under various pre-treatments was used for biohythane fermentation. </LI> <LI> Physiochemical characteristics of biomass before and after treatment were analysed. </LI> <LI> Optimal SHY of 39.4 mL/g VS was obtained from hydrothermal acid pre-treatment. </LI> <LI> 34.4% decrease in SHY occurred when pre-treated with hydrothermal alkali. </LI> <LI> Fermentation time of two-stage process was 22.7% less than single-stage process. </LI> </UL> </P>

2020

Elsevier

0360-3199

1879-3487

45

59

pp.34461-34472

10.1016/j.ijhydene.2020.02.027

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART105705452

Bloom algae; Hythane; Fermentation; Hydrothermal pre-treatment; Sustainable gaseous biofuel