Effect of metal oxide based TiO2 nanoparticles on anaerobic digestion process of lignocellulosic substrate

Lignocellulosic materials are recalcitrant to bioconversion, due to their rigid physiochemical structure. In this work, the effects of Fe2O3–TiO2 and NiO–TiO2 nanoparticles (NPs) and FeCl3 and NiCl2 salts, on the anaerobic digestion (AD) of wheat straw have been investigated. For this purpose, metal...

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Bibliographic Details
Published in:Energy (Oxford) 2020-01, Vol.191, p.116580, Article 116580
Main Authors: Ghofrani-Isfahani, Parisa, Baniamerian, Hamed, Tsapekos, Panagiotis, Alvarado-Morales, Merlin, Kasama, Takeshi, Shahrokhi, Mohammad, Vossoughi, Manouchehr, Angelidaki, Irini
Format: Article
Language:English
Subjects:
Acid production
Anaerobic digestion
Anaerobic processes
Bioconversion
Chemical oxygen demand
Experiments
Fatty acids
Ferric chloride
Iron chlorides
Lignocellulose
Metal oxides
Nanoparticles
Nickel chloride
Nickel oxides
Organic chemistry
Physiochemistry
Salts
Substrates
TiO2
Titanium dioxide
Trace elements
Volatile fatty acids
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Summary:Lignocellulosic materials are recalcitrant to bioconversion, due to their rigid physiochemical structure. In this work, the effects of Fe2O3–TiO2 and NiO–TiO2 nanoparticles (NPs) and FeCl3 and NiCl2 salts, on the anaerobic digestion (AD) of wheat straw have been investigated. For this purpose, metal oxide-TiO2 NPs were synthesized and fully characterized. Results showed that addition of 0.252 mg of NiO–TiO2/g total solids (TS) to batch assays resulted in increase of soluble chemical oxygen demand (COD) and 67% increase in volatile fatty acids (VFAs) concentration compared to control tests during the first 4 days of experiments. These results indicate that hydrolysis and acidogenesis rates have been enhanced due to addition of NPs. No significant effects have been observed in soluble COD and VFAs concentrations compared to control experiments by adding salts to the batch assays. Addition of NPs or salts led to an increase in methane production rate during the first 4 days of experiments. •TiO2 nanoparticles (NPs) coated with Fe2O3 or NiO were synthesized and characterized.•The effects of trace metals were tested on anaerobic digestion of wheat straw.•Up to 13% increase in soluble COD is observed due to increase of hydrolysis rate.•Total VFAs production rate increased up to 67% using NPs.•NPs and salts boosted methane production rate up to 21.1% and 29%, respectively.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.116580