Spray drying of a phenolic‐rich membrane filtration fraction of olive mill wastewater: optimisation and dried product quality |
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| Authors: | Ivana Sedej Rebecca Milczarek Selina C Wang Runqi Sheng Roberto de Jesús Avena‐Bustillos Lan Dao Gary Takeoka |
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| Affiliation: | 1. Olive Center, University of California, Davis, Davis, CA, USA;2. Healthy Processed Foods Research Unit, United States Department of Agriculture – Agricultural Research Service, Albany, CA, USA |
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| Abstract: | Olive mill wastewater (OMWW) from 3‐ and 2‐phase mills was subjected to a two‐step membrane filtration process. The obtained reverse osmosis retentate (RO‐R) is a phenolic‐rich coproduct stream, and the reverse osmosis permeate is a near‐pure water stream. A pilot‐scale spray dryer was used for the production of RO‐R powder. The optimum temperature/feed pump conditions were obtained for 3‐phase (150°C/4.4 Hz) and for 2‐phase RO‐R (175°C/3.8 Hz). The powders obtained by spray drying under these conditions were analysed for physicochemical properties, including identification and quantification of phenolic compounds. Protocatechuic acid, 3‐hydroxytyrosol, tyrosol, vanillic acid and p‐coumaric acid were quantified in both RO‐R powders, which show the possibility to obtain a phenolic‐rich powder from an OMWW filtration fraction. This will lead towards better usage of by‐products from olive oil production. |
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| Keywords: | Filtered olive mill wastewater optimisation phenolics reverse osmosis retentate spray drying |
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