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Issue 3, 2020
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Supramolecular solvents for the valorization of coffee wastewater

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Abstract

Supramolecular solvents (SUPRASs) were investigated for the recovery of bioactives from coffee wastewater (CWW), an abundant residue in the wet and semi-wet processing methods of coffee beans. The SUPRASs were made up of hexagonal inverted aggregates of hexanol or decanoic acid and were spontaneously produced in the wastewater through self-assembly processes. The SUPRAS components were authorized food ingredients facilitating future industrial applicability. Under passive extraction (without stirring), caffeine was recovered with a yield of 54 to 65 mg per liter of wastewater. The SUPRAS extracts showed good antioxidant capacity (up to 53% ABTS˙+) and were stable for at least 2 months in the range of temperatures investigated (4–24 °C) for the preservation of bioactives. Additionally, the SUPRAS-based extraction of bioactives improved substantially some wastewater quality parameters (e.g. BOD, total suspended solids and conductivity), so this process also helped to purify wastewater before dumping it into surface waters.

Graphical abstract: Supramolecular solvents for the valorization of coffee wastewater

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Article information


Submitted
11 Dec 2019
Accepted
07 Jan 2020
First published
07 Jan 2020

Environ. Sci.: Water Res. Technol., 2020,6, 757-766
Article type
Paper

Supramolecular solvents for the valorization of coffee wastewater

L. S. Torres-Valenzuela, A. Ballesteros-Gomez, J. Serna, A. Arango and S. Rubio, Environ. Sci.: Water Res. Technol., 2020, 6, 757
DOI: 10.1039/C9EW01095E

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