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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Environmental Chemical Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Chemical Engineering, 8,4, 2020 DOI: 10.1016/j.jece.2020.103951

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Valorization of pomegranate husk - Integration of extraction with nanofiltration for concentrated polyphenols recovery

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Article number103951
<mark>Journal publication date</mark>1/08/2020
<mark>Journal</mark>Journal of Environmental Chemical Engineering
Issue number4
Volume8
Number of pages8
Publication StatusPublished
Early online date19/04/20
<mark>Original language</mark>English

Abstract

A process development study is reported, involving water-based extraction of polyphenols from pomegranate husk and their subsequent membrane concentration. Aiming to optimize extraction, various experimental conditions were investigated, including extraction duration, solid to liquid ratio (2-14 % w/v dry weight), extraction temperature, number of sequential extraction stages (single, double and triple) and type of solvent. It was found that two extraction stages (90 min each) under a solid to water ratio of 3% w/v at 30 °C, were sufficient for obtaining a yield of 85% of total polyphenols from the husk. Subsequently, nanofiltration (NF) was used to concentrate the polyphenols extracts by a volume concentration factor (VCF) of three. Two main process parameters, namely pressure (4-14 bar) and pH (4-8), were examined at constant temperature 30◦C, in batch concentration mode. Results show near optimum NF-membrane performance, with high total polyphenols retention (≥ 98%) at 10 bar pressure and pH 6. Interestingly, the NF-membrane, used for up to 10 filtration batches, exhibited satisfactory flux without intermediate cleaning, suggesting that it could be employed for an extended period. Prospects and challenges are discussed for further process development and practical application.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Journal of Environmental Chemical Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Chemical Engineering, 8,4, 2020 DOI: 10.1016/j.jece.2020.103951