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Title

Processing of table olives with KOH and characterization of the wastewaters as potential fertilizer

AuthorsGarcía-Serrano, Pedro; Sánchez Gómez, Antonio Higinio CSIC ORCID CVN ; Romero Barranco, Concepción CSIC ORCID ; García García, Pedro CSIC ORCID CVN ; Castro Gómez-Millán, Antonio de CSIC ORCID ; Brenes Balbuena, Manuel CSIC ORCID
KeywordsWastewater
Fertilizer
Table olive
Bioactive
KOH
Issue Date2019
PublisherElsevier
CitationScience of the Total Environment 676: 834- 839 (2019)
AbstractIn Mediterranean countries the table olive industry produces a huge volume of wastewaters that are phytotoxic due to their high sodium content. Olives intended for Spanish-style green olives are currently debittered with NaOH that generates lyes and washing waters that cannot be used for agronomic purposes. In this study, the substitution of NaOH with KOH during the debittering of Manzanilla and Hojiblanca cultivars was assessed as well as the vacuum evaporation of the olive wastewaters to comply with fertilizer requirements. Typical lactic acid fermentation occurred in brines of olives treated with KOH and a final product with similar color and flavor characteristics to those treated with NaOH was achieved. However, lower texture was found in olives debittered with KOH than those with NaOH, using them at the same molar concentration. Furthermore, the lyes and washing waters from the KOH treatment were concentrated up to 10% of their initial volume and they complied with Spanish requirements to be considered as organo-mineral fertilizers (Corganic > 4%, K2O > 2%, Ntotal + K20 > 6%) although an external source of nitrogen would be needed. They also had a high content in phenolic compounds, particularly hydroxytyrosol. This research demonstrates that table olives can be processed with KOH and the generated waste streams could have potential applications in agriculture or being a source of bioactive substances.
URIhttp://hdl.handle.net/10261/196033
DOI10.1016/j.scitotenv.2019.04.193
Identifiersdoi: 10.1016/j.scitotenv.2019.04.193
issn: 1879-1026
Appears in Collections:(IG) Artículos




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