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Abstract
Butyrate is an important precursor for fine chemicals and biofuels. The aim of this study is to investigate butyrate production as affected by transition metal addition of food waste fermentation including, nickel, Raney nickel and copper particles. Performance of fermentation showed nickel particles achieved the highest butyrate concentration, 7.3 g/L, which was 38.5% higher than that in the control trial. Raney nickel also showed similar effect on the enhancement of butyrate production. However, increased dosage of transition metal particle addition led to decreased butyrate production. The theoretical link between metal-assisted dark fermentation and butyrate production was tentatively explored. Redox potential affected by nickel addition was assumed to be an essential factor for butyrate production. Microbial community analysis found Clostridium sensu stricto 11 may be the dominant functional species for butyrate production. The study demonstrates that development on transition metal catalyst may contribute to waste biorefinery for added value products/energy production.
Published Version
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