Optimization and modeling of two-phase olive-oil washing wastewater integral treatment and phenolic compounds recovery by novel weak-base ion exchange resins
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AuthorOchando Pulido, Javier Miguel; Vellido Pérez, José Antonio; González Hernández, Rubén; Martínez Férez, Antonio
Olive-oil washing wastewaterIon exchangeResinsPhenolic compoundsWastewater reclamationSustainability
J.M. Ochando-Pulido, J.A. Vellido-Perez, R. Gonzalez-Hernandez, A. Martinez- Ferez. Optimization and modeling of two-phase olive-oil washing wastewater integral treatment and phenolic compounds recovery by novel weak-base ion exchange resins. Sep. Purif. Technol. 249 (2020), 117084. [https://doi.org/10.1016/j.seppur.2020.117084]
SponsorshipSpanish Ministry of Economy and Competitiveness is acknowledged for having funded the project CTM2014-61105-JIN ‘Design and development of an integral process for revalorization and treatment of the effluents from olive oil industry’, as well as the University of Granada.
In light of the Circular Economy concept, recently emerged as a need for sustainable production, olive oil industry should be concerned to transform the whole process into environmentally friendly, which necessarily implies the treatment of the wastewater by-produced in olive mills. In this work, concentration and recovery of high-added value phenolic compounds from two-phase olive-oil washing wastewater (OOWW) and parallel effluent treatment by a ‘green process’ based on novel weak-base ion exchange (IE) resins was addressed. The key operating input factors of the resin process for the treatment and valorization of OOWW were studied, optimized and further modelled. A Box-Behnken design was implemented and the obtained data were analyzed by ANOVA and interpreted by RSM methodology. The process was ulteriorly modelled by a second-grade quadratic fitting equation comprising the significant operating variables. The optimization of the IE process performance (20.3 °C, pH0 6.7 and 114 g/L Mresin) ensured up to 92.5% recovery of total phenols concentration. Moreover, the purified stream presented good quality (56.6–83.7 mg L−1 total phenols), following standard recommendations by the FAO. The obtained information would be of key importance for the scale-up of the proposed IE operation. Both the treatment and revalorization of OOWW would help implement a definite sustainable production process of olive-oil.