Abstract
The potential of Scenedesmus obliquus biomass, after treating several wastewaters (WWs) (urban, dairy and brewery industries, cattle and poultry breeding), was evaluated for the production of bio-char, bio-oil and bio-gas, through a pyrolysis process. The experiments were carried out in a fixed bed reactor at a temperature of 748 K during 15 min. The thermochemical behaviour of each microalga was assessed by thermogravimetry analysis and infrared spectroscopy. The bio-oils obtained were also quantified and characterized. The results reveal that (i) all microalgae show a similar thermal degradation behaviour; (ii) microalga grown in urban WW shows a lower percentage of lipids; in dairy and cattle WWs, it shows a high percentage of both proteins and lipids, and in poultry and brewery WWs, it shows a higher carbohydrates content; (iii) the microalga grown in poultry WW shows the lowest protein content, whereas the urban grown microalga showed the highest protein content; (iv) the bio-oil obtained by pyrolysis process showed yields in the range 30–60% (w/w) and showed a high content of aromatic compounds.
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Acknowledgements
The authors would like to thank Dr. Paula Assemany, Dr. Henrique Vieira de Mendonça MSc Ana Barata for microalga biomass production; Graça Gomes (LNEG) and Natércia Santos (LNEG) for microalgae culture maintenance and laboratory assistance.
Funding
The study was financially supported by the Project ALGAVALOR - MicroALGAs: produção integrada e VALORização da biomassa e das suas diversas aplicações, from the Portugal 2020 programme (grant agreement no. POCI-01-0247-FEDER-035234; LISBOA-01-0247-FEDER-035234; ALG-01-0247-FEDER-035234); GreenCoLab – Green Ocean Technologies and Products Collaborative Laboratory, no. ALG-05-3559-FSE-000010, Algarve 2020 Operational Regional Program, funded by European Social Fund and Portuguese Government budget; Biomass and Bioenergy Research Infrastructure (BBRI)-LISBOA-01-0145-FEDER-022059, supported by Operational Programme for Competitiveness and Internationalization (PORTUGAL2020), by Lisbon Portugal Regional Operational Programme (Lisboa 2020) and by North Portugal Regional Operational Programme (Norte 2020) under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). Ana F. Ferreira and Ana Paula Dias would like to thank the financial support by the Fundação para a Ciência e a Tecnologia (FCT), through IDMEC, under LAETA, project UID/EMS/50022/2019. Alice Ferreira is pleased to acknowledge her PhD grant no. SFRH/BD/144122/2019 awarded by Fundação para a Ciência e Tecnologia.
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Ferreira, A.F., Ferreira, A., Dias, A.P.S. et al. Pyrolysis of Scenedesmus obliquus Biomass Following the Treatment of Different Wastewaters. Bioenerg. Res. 13, 896–906 (2020). https://doi.org/10.1007/s12155-020-10102-1
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DOI: https://doi.org/10.1007/s12155-020-10102-1