Treatment of olive-mill wastewater from a two-phase process by chemical oxidation on an industrial scale

Nieto, Leonardo Martín; Hodaifa, Gassan; Vives, S. Rodríguez; Casares, J.A. Giménez; Driss, S. B.; Grueso, R.

doi:10.2166/wst.2009.165

Cited by 24 publications

(8 citation statements)

References 18 publications

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“…Only when the catalyst concentration was ≥5 g/L, the %COD removal was >50% (corresponding X TC and X TOC ≈ 0.47, Figure 2b,c). The OMW photodegradation profiles by heterogeneous photo-Fenton reaction using HFeO 2 as a catalyst are similar to those obtained by Agabo and Hodaifa [23], Hodaifa et al [17], and Martínez-Nieto [22,32] for homogenous photo-Fenton reaction. In fact, Figure 3 shows the degradation capacity of the system UV/HFeO 2 /H 2 O 2 , in which the degradation is increased with the reaction time.…”

Section: Organic Matter Degradationsupporting

confidence: 83%

Heterogeneous Photo-Fenton Reaction for Olive Mill Wastewater Treatment—Case of Reusable Catalyst

2021

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Heterogeneous catalysts can be an efficient and economical option for olive mill wastewater (OMW) treatment by an advanced oxidation process if they could be reused. In this work, OMW was treated using a heterogeneous photo-Fenton reaction (artificial ultraviolet light/H2O2/HFeO2). For this purpose, different concentrations of HFeO2 were tested: 0.04; 0.3; 0.8; 5.0; 10.0; 20.0; 30.0, and 50.0 g/L. The following operational conditions were chosen: pH = 3.0, temperature = 20 °C, agitation rate = 700 rpm. The experimental results showed high removal percentages of the main OMW characterization parameters at 50 g/L of HFeO2: %CODremoval = 62.8%; %total phenolic compounds (TPCs) = 88.9%. These results were also compared with those of other control oxidation systems, i.e., UV, H2O2, and UV/H2O2, which provided 35.5 and 56.1%; 46.2 and 74.0%; 48.0 and 76.8% removal, respectively. In addition, the catalyst was reused three times, recovering more than 90.5% of it.

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Section: Organic Matter Degradationsupporting

confidence: 83%

Heterogeneous Photo-Fenton Reaction for Olive Mill Wastewater Treatment—Case of Reusable Catalyst

2021

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“…First, in all cases it can be observed pH values above 7. These values are higher than normal values (pH < 7) for these wastewaters [22] probably due to mixed different waters in the raft. As water from washing olive-oil tanks (drinking water plus NaOH), or the wastewater from table olives industry with OMWs, which increases pH values.…”

Section: Characterization Of Olive Oil Mill Wastewater (Omw)contrasting

confidence: 55%

Treatment of Olive Oil Mill Wastewater by UV-Light and UV/H2O2 System

Hodaifa¹

2018

Int. J. Green Technol.

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Olive oil mills generates large volumes of wastewaters (OMW). The absence of legislation, which manages and obligates the treatment of OMW has led to the creation of large build-evaporation ponds as a solution for this environmental problem. The function of these ponds is the evaporation of wastewater during summer months. However, evaporation isn't enough to eliminate all wastewater in the rafts and this fact allows the generation of a great volume of concentrate wastewater with high organic load (COD = 0.5-38 g O2/L). The environmental impact produced by the accumulation of polluted wastewater demands the design of processes for OMW treatment. In this sense, the influence of ultraviolet light (UV) and the combined system of UV/H2O2, in the degradation of organic matter of OMW, were studied. UV-light application at a short time (<30 min) implies a removal values in COD = 15-22%, total carbon (TC), total organic carbon (TOC) and total nitrogen (TN) in the range 34% to 43%. The turbidity elimination was registered in the range 68% to 70%. In the case of combined UV/H2O2 system the removal percentages were 40-48% for COD, 39.4-51.9% for TC, 33.0-48.0% for TOC, 37.0-53.1% for TN, and 66.8-93.4% for turbidity.

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“…This pond only accumulated olives washing wastewater, which normal COD value is below 1000 mg O 2 /L [22]. According to the literature [17,22,23,27,28], COD values of olive oil washing wastewater from the two-phase process normally vary from 4000 to 16,000 mg O 2 /L. In this sense, only COD of Seville 1 (6187 mg O 2 /L) was found in the range.…”

Section: Introductionmentioning

confidence: 92%

“…However, low values (COD = 501 mg O 2 /L, TOC = 177 mg/L, TN = 12.6 mg/L, electric conductivity (EC) = 1.51 mS/cm and pH = 7.04) were registered in the case of OMW accumulated in the pond of Seville 2. This pond only accumulated olives washing wastewater, which normal COD value is below 1000 mg O 2 /L [22]. According to the literature [17,22,23,27,28], COD values of olive oil washing wastewater from the two-phase process normally vary from 4000 to 16,000 mg O 2 /L.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the Fenton reaction has a high potential to treat wastewater with a high load of organic matter due to its high effectivity in removing a wide range of hazardous organic pollutants from wastewater. Its main benefit is the complete degradation of the contaminants to harmless compounds, e.g., CO 2 , water and inorganic salts [18,[22][23][24]. Fenton's reagent generates hydroxyl radicals according to the following reaction [25]:…”

Section: Introductionmentioning

confidence: 99%

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Study of Catalysts’ Influence on Photocatalysis/Photodegradation of Olive Oil Mill Wastewater. Determination of the Optimum Working Conditions

2020

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The high production of raw olive oil mill wastewater (OMW) is a current environmental problem due to its high organic load and phenol compounds. In this work, photo-Fenton reaction as an advanced oxidation process has been chosen for OMW treatment. In this sense, different iron salts (FeCl3, Fe2(SO4)3, FeSO4·7H2O, and Fe(ClO4)3) as catalysts were used in order to compare their effects on treatment. For each catalyst, different H2O2 concentrations (2.5, 5.0, 7.5, 10.0, 15.0, 20.0, and 30.0%, w/v) as oxidizing agents were tested. The common experimental conditions were temperature 20 °C, the catalyst/H2O2 ratio = 0.03, pH = 3, and ultraviolet light. The Lagergren kinetic model, in cases of total organic carbon removal, for the best H2O2 concentration per catalyst was used. During the experiments, the water quality was determined by measuring the removal percentages on chemical oxygen demand, total carbon, total organic carbon, total nitrogen, total phenolic compounds, total iron, turbidity and electric conductivity. The best catalyst was FeCl3 and the optimum H2O2 concentration was 7.5% (w/v). At these optimal conditions, the removal percentages for chemical oxygen demand, total phenolic compounds, total carbon, total organic carbon and total nitrogen were 60.3%, 88.4%, 70.1%, 63.2% and 51.5%, respectively.

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Treatment of olive-mill wastewater from a two-phase process by chemical oxidation on an industrial scale

Cited by 24 publications

References 18 publications

Heterogeneous Photo-Fenton Reaction for Olive Mill Wastewater Treatment—Case of Reusable Catalyst

Heterogeneous Photo-Fenton Reaction for Olive Mill Wastewater Treatment—Case of Reusable Catalyst

Treatment of Olive Oil Mill Wastewater by UV-Light and UV/H2O2 System

Study of Catalysts’ Influence on Photocatalysis/Photodegradation of Olive Oil Mill Wastewater. Determination of the Optimum Working Conditions

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