Treatment of high-strength olive mill wastewater by combined Fenton-like oxidation and coagulation/flocculation

Esteves, Bruno M.; Rodrigues, Carmen S.D.; Maldonado-Hódar, Francisco J.; Madeira, Luís M.

doi:10.1016/j.jece.2019.103252

Cited by 51 publications

(21 citation statements)

References 61 publications

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“…The level of toxicity and biodegradability of OMW is commonly related to the amount of TPh present in solution [58]. Toxicity values were evaluated following the inhibition (%) caused to the bioluminescent V. fischeri bacteria when in contact with the phenolic solutions (contact times of 5, 15, and 30 min).…”

Section: Treatment Of Simulated Omwmentioning

confidence: 99%

Fitting Biochars and Activated Carbons from Residues of the Olive Oil Industry as Supports of Fe- Catalysts for the Heterogeneous Fenton-Like Treatment of Simulated Olive Mill Wastewater

et al. 2020

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A series of biochars and activated carbons (ACs) was prepared combining carbonization and physical or chemical activation of cheap and abundant residues of the olive oil industry. These materials were used as Fe-support to develop low-cost catalysts for the heterogeneous Fenton-like oxidation of simulated olive mill wastewater (OMW), the highly pollutant effluent generated by this agroindustry. Commercial ACs were also used as reference. All catalysts prepared were extensively characterized and results related with their performances in the catalytic wet peroxide oxidation (CWPO). Results showed a linear relationship of the textural properties of the catalysts with the adsorptive and catalytic performance, as well as the preferential adsorption and degradation of some phenolic compounds (caffeic and gallic acids) by specific interactions with the catalysts’ surface. Despite the best performance of catalysts developed using commercial supports, those prepared from agro-industrial residues present some advantages, including a smaller catalyst deactivation by iron leaching. CWPO results show that catalysts from physically activated olive stones are the most promising materials, reaching total organic carbon and toxicity reductions of 35% and 60%, respectively, as well an efficient use of H2O2, comparable with those obtained using commercial supports. This approach showed that the optimized treatment of this type of residues will allow their integration in the circular economic process of the olive oil production.

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Section: Treatment Of Simulated Omwmentioning

confidence: 99%

Fitting Biochars and Activated Carbons from Residues of the Olive Oil Industry as Supports of Fe- Catalysts for the Heterogeneous Fenton-Like Treatment of Simulated Olive Mill Wastewater

et al. 2020

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“…The implementation of these treatment processes in olive oil mills is clearly beneficial, taking into account: (i) the mild operational conditions (room temperature, atmospheric pressure), (ii) the lack of high investments (economic equipment), (iii) the simplicity of the technology and (iv) the eco-friendly character of the process (harmless oxidizing agents and recoverable catalysts) [33]. In previous works, Fe 3+ salts (coming mainly from ferric chloride, FeCl 3 ) were as effective as Fe 2+ ones, in spite of producing an initial slower rate of H 2 O 2 decomposition [30].…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, Nieto et al [18] studied OMW treatment through a homogeneous Fenton-like reaction. Furthermore, Esteves et al [33] tested Fe 3+ /H 2 O 2 and Fe 3+ /H 2 O 2 /UV systems for OMW treatment. In the second system, the UV/visible light generated from a high-pressure mercury vapor, Heraeus TQ (TQ is the lightest of the permissible cap lamps) 150 with 150 W, was used.…”

Section: Introductionmentioning

confidence: 99%

“…The comparison between Fenton and photo-Fenton reactions for OMW treatment was developed achieving 34.9% vs. 41.8% on total organic carbon (TOC) removal, 55.7% vs. 63.2% on COD removal and 81.4% vs. 83.8% of total phenolic compounds (TPCs) removal. Esteves et al [33], also tested two different iron salts FeSO 4 •7H 2 O and FeCl 3 •6H 2 O at only [Fe 2+ or Fe 3+ ] = 1 g/L, obtaining that TOC removal was higher in the case of FeCl 3 •6H 2 O in comparison with applying FeSO 4 •7H 2 O as the catalyst.…”

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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“…It should be noted that there is a total of 1,748 olive mills (IOC, cited in Garcia & Hodaifa, 2017) in Spain with more than 90% of the mills operating using the two-phase system (Kapellakis et al, 2008). In situ evaporation ponds are also the most common practice in Greece, Tunisia, and Portugal (Gargouri et al, 2013;Kelessidis & Christoforou, 2014;Esteves et al, 2019).…”

Section: Recommended Actions and Future Perspectivesmentioning

confidence: 99%

Impact of legislation on olive mill wastewater management: Jordan as a case study

2021

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Olive mill wastewater (OMWW) management is becoming more challenging and a major environmental concern due to several factors including the very complex wastewater, which is considered one of the most difficult-to-treat. Seasonal production and small scattered family milling business have resulted in augmented management challenges. As the eighth largest olive oil exporter, Jordan is not an exception and faces some environmental and management concerns. The country had recently managed OMWW wel; however, some issues need to be addressed in order to meet environmental requirements of the growing business. This paper aims at evaluating the Jordanian experience in OMWW management and recommends additional alternatives. OMWW shipping is controlled by a tracking system to designated disposal sites. However, weak enforcement of penalties results in violations. Moreover, current management practical options are limited in view of existing regulations since agricultural land application and decentralized management are discouraged. Legislative gaps are discussed and suggestions for a comprehensive revision established to allow for additional management alternatives. A revised legislative framework that takes into account resource recovery and the valorization of OMWW based on scientific evidence is highly recommended.

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Treatment of high-strength olive mill wastewater by combined Fenton-like oxidation and coagulation/flocculation

Cited by 51 publications

References 61 publications

Fitting Biochars and Activated Carbons from Residues of the Olive Oil Industry as Supports of Fe- Catalysts for the Heterogeneous Fenton-Like Treatment of Simulated Olive Mill Wastewater

Fitting Biochars and Activated Carbons from Residues of the Olive Oil Industry as Supports of Fe- Catalysts for the Heterogeneous Fenton-Like Treatment of Simulated Olive Mill Wastewater

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

Impact of legislation on olive mill wastewater management: Jordan as a case study

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