BioChem - DOS

Early warning indicators and microbial community dynamics during unstable stages of continuous hydrogen production from food wastes by thermophilic dark fermentation

International journal of hydrogen energy

Jia, Xuan; Wang, Yong; Ren, Lianhai; Li, Mingxiao; Tang, Renshi; Jiang, Yonghai; Hou, Jiaqi

<P><B>Abstract</B></P> <P>Early warning indicators (EWIs) and microbial community dynamics during thermophilic dark fermentation-based hydrogen production (TFHP) from food wastes were investigated during stable and fluctuating operations in continuous systems. Difference and redundancy analyses revealed the linkage between dominant genera, metabolites and process parameters and characterized the EWIs and mechanism of instability of the TFHP. Besides biogas production rate (GPR), hydrogen proportion and volatile fatty acids (VFAs) concentrations, the potential warning function of the microbial community were observed. <I>Thermoanaerobacterium</I> was the dominant genus which decreased during the unstable stages. <I>Bacillus</I> is another EWI in unstable stages when the value of pH is lower. <I>Lactobacillus</I> and <I>Weissella</I> appeared as OLR increased to 9 g VS L<SUP>&minus;1</SUP> d<SUP>&minus;1</SUP> in the OLR-9 unstable stage. This study demonstrates the key EWIs for monitoring and controlling continuous hydrogen production and its stability<B>.</B> </P> <P><B>Highlights</B></P> <P> <UL> <LI> Early warning indicators and instability mechanism of the <B>TFHP</B> were determined. </LI> <LI> Continuous H<SUB>2</SUB> production was established under OLR stress and pH fluctuation. </LI> <LI> Significant differences in microbial community were observed in unstable stages. </LI> <LI> <I>Thermoanaerobacterium</I> was the dominant genus in stable and fluctuating operations. </LI> <LI> <I>Bacilli, Lactobacillus</I> and <I>Weissella</I> enriched rapidly in unstable stages. </LI> </UL> </P>

2019

Elsevier

0360-3199

1879-3487

44

57

pp.30000-30013

10.1016/j.ijhydene.2019.08.082

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART98232558

Early warning indicators; Unstable stages; Microbial community dynamics; Thermophilic dark fermentation; Hydrogen production; Food wastes