Journal
CHEMICAL ENGINEERING JOURNAL
Volume 387, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123404
Keywords
Microwave pyrolysis; Olive pomace; Bio-oil; Bio-char; Bioenergy
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Funding
- UK Biotechnology and Biological Sciences Research Council [BB/S010610/1]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT), Mexico [389535]
- University of Nottingham
- BBSRC [BB/J019402/1] Funding Source: UKRI
- EPSRC [EP/K014897/1, EP/S01778X/1] Funding Source: UKRI
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Olive pomace is a widely available agro-industrial waste residue in Europe that has the potential to contribute towards a circular, low carbon bio-economy. This study demonstrated, for the first time, the ability to successfully pyrolyse olive pomace with microwaves for the production of bio-char and bio-oil. It was found that the energy requirement needed to pyrolyse up to 80% of the olive pomace was as low as 3.6 kJ/g and bio-oil yields up to 30% were produced. Microwave power did not influence the overall yields or the chemical composition of the obtained bio-oils, but did alter the textural properties of the generated bio-chars and their ability to remove methylene blue dye. Optimum processing conditions were found to be within the 3.6 kJ/g energy requirement with a microwave power of 200 W and processing time of 180 sec. These conditions produced a bio-oil fraction containing mainly acetic acid (71.9%) and a bio-char with a surface area of 392.3 m(2)/g, micropore volume of 0.15 cm(3)/g and a methylene blue removal efficiency of 40 qMB mg/g. The results acquired from this study reveal the superiority of microwave heating in a pyrolysis system and highlight a novel and prospective route for added value recovery from natural waste resources like olive pomace.
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