BioChem - DOS

Co-ensiling of cover crops and barley straw for biogas production

Renewable energy

Feng, Lu; Perschke, Yolanda Maria Lemes; Fontaine, Doline; Ward, Alastair James; Eriksen, Jørgen; Sørensen, Peter; Møller, Henrik Bjarne

<P><B>Abstract</B></P> <P>The study investigated the effect of co-ensiling of cover crops (CC) and barley straw (BS) on biogas production. Blends containing chopped CC and BS (mix ratios of 1:0, 2:1, 3:1, 6:1; 10:1 and 19:1 (<I>w:w</I>)) were prepared and stored for 4 months prior to the biogas batch assay. Results show that CC is feasible for producing biogas with reasonable CH<SUB>4</SUB> yield (330 mL CH<SUB>4</SUB> gVS<SUP>&minus;1</SUP>) and has good storability. Using of co-ensiling blends showed advantages over CC as it elevated the hydrolysis rate (<I>k</I>) from 0.024 to 0.061 d<SUP>&minus;1</SUP> and decreased the lag phase (from 5 to 0.8 days) during the thermophilic (51 &deg;C) batch test. Synergistic effects were observed from both CH<SUB>4</SUB> yield and hemi-cellulose removal. The finding provided an alternative strategy for integrated straw management and CC utilization for improved biogas production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of co-ensiling blends and impact of synergy were investigated. </LI> <LI> Cover crop is feasible for biogas and has good storability. </LI> <LI> Anaerobic digestion of co-ensiled blend has high hydrolysis rate and low lag phase. </LI> <LI> Synergy were observed on CH<SUB>4</SUB> yield and hemicellulose removal of co-ensiled blend. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

2019

Elsevier

0960-1481

142

pp.677-683

10.1016/j.renene.2019.04.138

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART97704775

Agricultural residue; Anaerobic digestion; Methane; Biomass; Silage