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Spray drying of a phenolic‐rich membrane filtration fraction of olive mill wastewater: optimisation and dried product quality
Author(s) -
Sedej Ivana,
Milczarek Rebecca,
Wang Selina C.,
Sheng Runqi,
Jesús AvenaBustillos Roberto,
Dao Lan,
Takeoka Gary
Publication year - 2016
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.13163
Subject(s) - tyrosol , chemistry , reverse osmosis , hydroxytyrosol , filtration (mathematics) , chromatography , wastewater , pulp and paper industry , vanillic acid , membrane , fraction (chemistry) , phenols , polyphenol , organic chemistry , environmental engineering , environmental science , biochemistry , statistics , mathematics , engineering , antioxidant
Summary 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.