About two-phase olive oil washing wastewater simultaneous phenols recovery and treatment by nanofiltration

Photocatalytic degradation of olive oil mill wastewater from two-phase continuous centrifugation process was studied. A novel photocatalyst with ferromagnetic properties was characterized and investigated. The degradation capacity of the photocatalytic process of olive oil washing wastewater (OMW) and mixture of olives and olive oil (1 v/v) washing wastewaters (MOMW) was demonstrated. At lab-scale, the %COD removal and residence time (τ) for MOMW and OMW were 58.4% (τ=2 h) and 21.4% (τ=3 h), respectively. On the other hand, at pilot scale, 23.4%CODremoval, 19.2% totalphenolsremoval, and 28.1% total suspendedsolidsremovalwere registered at the end of the UV/TiO2process for OMW, whereas 58.3%CODremoval, 27.5% totalphenolsremoval, and 25.0% total suspendedsolidsremovalfor MOMW. Also, before the UV/TiO2reaction, a pH-T flocculation operation as pretreatment was realized. The overall efficiency of the treatment process for MOMW was up to 91% ofCODremoval, in contrast with 33.2% ofCODremovalfor OMW.

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On the effect of the operating parameters for two-phase olive-oil washing wastewater combined phenolic compounds recovery and reclamation by novel ion exchange resins

Separation and Purification Technology ◽

10.1016/j.seppur.2017.11.075 ◽

2018 ◽

Vol 195 ◽

pp. 50-59 ◽

Cited By ~ 16

Author(s):

Javier M. Ochando-Pulido ◽

Rubén González-Hernández ◽

Antonio Martinez-Ferez

Keyword(s):

Phenolic Compounds ◽

Ion Exchange ◽

Olive Oil ◽

Operating Parameters ◽

Ion Exchange Resins ◽

Two Phase ◽

Washing Wastewater ◽

Exchange Resins

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Comparison between different liquid-liquid and solid phase methods of extraction prior to the identification of the phenolic fraction present in olive oil washing wastewater from the two-phase olive oil extraction system

Grasas y Aceites ◽

10.3989/gya.0225171 ◽

2017 ◽

Vol 68 (3) ◽

pp. 208 ◽

Cited By ~ 3

Author(s):

S. Jiménez-Herrera ◽

J. M. Ochando-Pulido ◽

A. Martínez-Ferez

Keyword(s):

Phenolic Compounds ◽

Olive Oil ◽

Solid Phase ◽

Lipid Fraction ◽

Liquid Extraction ◽

Biologically Active ◽

Two Phase ◽

Phenolic Fraction ◽

Hydrocinnamic Acid ◽

Washing Wastewater

Phenolic compounds from olive mill wastewater (OMW), are characterized by a strong antioxidant activity. At the same time, they represent an environmental problem because they are difficult to degrade. The purpose of this work was to identify these biologically active compounds in the OMW from two-phase olive oil production in order to convert a polluting residue into a source of natural antioxidants. After optimizing the extraction process of phenolic compounds using liquid-liquid extraction (LLE) and solid phase extraction (SPE) methods, it was determined that the most appropriate sequence comprised a previous centrifugation to remove the lipid fraction, followed by liquid extraction with ethyl acetate or SPE. The most important compounds identified in olive oil washing wastewater (OOWW) were tyrosol, hydroxytyrosol and succinic acid; whereas the ones in the wastewater derived from the washing of the olives (OWW) were cresol, catechol, 4-methylcatechol, hydrocinnamic acid and p-hydroxy-hydrocinnamic acid.

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