BioChem - DOS

Optimizing biomethane production of mesophilic chicken manure and sheep manure digestion: Mono-digestion and co-digestion kinetic investigation, autofluorescence analysis and microbial community assessment

Journal of environmental management

Song, Liuying; Li, Dunjie; Cao, Xiangyunong; Tang, Yu; Liu, Rutao; Niu, Qigui; Li, Yu-You

<P><B>Abstract</B></P> <P>Optimization of mesophilic methane production from Chicken manure (CM) and Sheep manure (SM) at total solid (TS) of 8% and 1.6% were obtained by sequence tests in mono-digestion. However, the positive synergy of co-digestion with an optimum CM/SM of 2.5 (310 mLCH<SUB>4</SUB>/gVS<SUB>added</SUB>) resulted in a high hydrolytic capacity and methane production. The modified Gompertz model (<I>R</I> <SUP>2</SUP> > 0.98) and modified Aiba model (<I>R</I> <SUP>2</SUP> > 0.88) illustrated co-digestion significantly improved the methane generation rate with strong ammonia tolerance. Dissolved Organic Matter (DOM) variation in response to the metabolic rate of microbial community illustrated that the SMP-like and protein-like components half-split by EEM&ndash;PARAFAC were significantly negative corresponded to bio-methane production. Moreover, the canonical correlation analysis (CCA) resulted a significant difference between the substrate and DOM composition. Potential functional metabolic illustrated statistically significance difference between mono and co-digestion, however, <I>Methanosaeta</I> and <I>Syntrophobacter</I> predominated the syntrophic methanogenesis. The constructed complex metabolic cooperation caused the co-digestion stable and high efficiency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-digestion evidenced high synthetic stability and more suitable micro-environment. </LI> <LI> Gompertz kinetic parameters illustrated optimized conditions of mono and co-digestion. </LI> <LI> DOM diversity and bioavailability are firstly revealed in time series by EEM-PARAFAC. </LI> <LI> The microbial community varies greatly response to different substrate feeding. </LI> <LI> Interaction of organics reduction and their impact on methane yield were studied. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

2019

Elsevier

0301-4797

1095-8630

237

pp.103-113

10.1016/j.jenvman.2019.02.050

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART95899883

Mono/co-digestion; Kinetic simulation; EEM-PARAFAC; Canonical correlation analysis (CCA); Metabolic potential