Journal
APPLIED ENERGY
Volume 230, Issue -, Pages 1082-1092Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.09.066
Keywords
Microalgae; Rice residue; Pretreatment; Physicochemical characteristics; Mix ratios; Co-fermentation
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Funding
- National Science Foundation for Young Scientists of China [51606021]
- International Cooperation and Exchange of the National Natural Science Foundation of China [51561145013]
- Fundamental Research Funds for the Central Universities [106112017CDJPT140001]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2017019]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [797259]
- Science Foundation Ireland (SFI) through the Centre for Marine and Renewable Energy (MaREI) [12/RC/2302]
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Dark fermentation may be hindered by insufficient bioavailable carbon and nitrogen sources as well as recalcitrant cell wall structures of substrates. Protein-rich microalgae and carbohydrate-rich rice residue with various mix ratios can optimise biohydrogen and volatile fatty acids production. Optimal pretreatment of the microalgae with 1% H2SO4 and the rice residue with 0.5% H2SO4 under hydrothermal heating (140 degrees C, 10 min) achieved reducing sugar yields of 187.3 mg/g volatile solids (VS) (hydrolysis efficiency: 54%) and 924.9 mg/g VS (hydrolysis efficiency: 100%), respectively. Multiscale physiochemical characterisations of solid hydrolytic residues confirmed considerable damage to both substrates. Co-fermentation of pretreated rice residue and microalgae at a mix ratio of 5:1 exhibited the maximum hydrogen yield of 201.8 mL/g VS, a 10.7-fold increase compared to mono-fermentation of pretreated microalgae. The mix ratio of 25:1 resulted in the highest carbon to volatile fatty acids conversion (96.8%), corresponding to a maximum energy conversion efficiency of 90.8%.
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