{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T19:59:22Z","timestamp":1768420762867,"version":"3.49.0"},"reference-count":42,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2021,4,27]],"date-time":"2021-04-27T00:00:00Z","timestamp":1619481600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Junta of Andalusia and Ministry of Economy and Competitiveness (Spain)","award":["AGR-7092"],"award-info":[{"award-number":["AGR-7092"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Catalysts"],"abstract":"<jats:p>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 \u00b0C, 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.<\/jats:p>","DOI":"10.3390\/catal11050557","type":"journal-article","created":{"date-parts":[[2021,4,27]],"date-time":"2021-04-27T21:18:20Z","timestamp":1619558300000},"page":"557","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Heterogeneous Photo-Fenton Reaction for Olive Mill Wastewater Treatment\u2014Case of Reusable Catalyst"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2809-5286","authenticated-orcid":false,"given":"Cristina","family":"Agabo-Garc\u00eda","sequence":"first","affiliation":[{"name":"Chemical Engineering and Food Technology Department, Faculty of Science, University of C\u00e1diz, ES-11510 Puerto Real, Spain"},{"name":"Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, Faculty of Experimental Sciences, University of Pablo de Olavide, ES-41013 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naima","family":"Calder\u00f3n","sequence":"additional","affiliation":[{"name":"Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, Faculty of Experimental Sciences, University of Pablo de Olavide, ES-41013 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6448-4049","authenticated-orcid":false,"given":"Gassan","family":"Hodaifa","sequence":"additional","affiliation":[{"name":"Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, Faculty of Experimental Sciences, University of Pablo de Olavide, ES-41013 Seville, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1080\/10643380490279932","article-title":"A Review of Waste Management Options in Olive Oil Production","volume":"34","author":"Azbar","year":"2004","journal-title":"Crit. Rev. Environ. Sci. Technol."},{"key":"ref_2","unstructured":"Niaounakis, M., and Halvadakis, C.P. (2004). Olive-Mill Waste Management\u2013Literature Review and Patent Survey, Elsevier."},{"key":"ref_3","unstructured":"Niaounakis, M., and Halvadakis, C.P. (2006). Olive Processing Waste Management, Elsevier. [2nd ed.]."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"345","DOI":"10.1016\/j.apenergy.2012.11.005","article-title":"Biomass production of Scenedesmus obliquus from mixtures of urban and olive-oil mill wastewaters used as culture medium","volume":"104","author":"Hodaifa","year":"2013","journal-title":"Appl. Energy"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1111","DOI":"10.1016\/j.biortech.2007.02.020","article-title":"Use of industrial wastewater from olive-oil extraction for biomass production of Scenedesmus obliquus","volume":"99","author":"Hodaifa","year":"2008","journal-title":"Bioresour. Technol."},{"key":"ref_6","first-page":"645","article-title":"Flocculation on the Treatment of Olive Oil Mill Wastewater: Pretreatment","volume":"9","author":"Hodaifa","year":"2015","journal-title":"Int. J. Chem. Mol. Nuclear Mater. Metallur. Eng."},{"key":"ref_7","first-page":"1039","article-title":"Physicochemical characterization of olive oil mill wastewaters in the eastern region of Morocco","volume":"5","author":"Bouknana","year":"2014","journal-title":"J. Mater. Environ. Sci."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Oreopoulou, V., and Russ, W. (2007). Fundamentals and applications of anaerobic digestion for sustainable treatment of food industry wastewater. Utilization of By-Products and Treatment of Waste in the Food Industry, Springer.","DOI":"10.1007\/978-0-387-35766-9"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"960","DOI":"10.1016\/j.wasman.2005.07.024","article-title":"An overview on olive mill wastes and their valorisation methods","volume":"26","author":"Roig","year":"2006","journal-title":"Waste Manag."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"46","DOI":"10.30634\/2414-2077.2015.01.5","article-title":"Treatment of Olive Oil Mill Wastewater by UV-Light and UV\/H2O2 System","volume":"1","author":"Hodaifa","year":"2015","journal-title":"Int. J. Green Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"32","DOI":"10.3989\/gya.2006.v57.i1.20","article-title":"Treatment technologies of liquid and solid wastes from two-phase olive oil mills","volume":"57","author":"Borja","year":"2006","journal-title":"Grasas y Aceites"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"289","DOI":"10.1016\/j.envint.2004.10.005","article-title":"Treatment of olive mill effluents","volume":"31","author":"Mantzavinos","year":"2005","journal-title":"Environ. Int."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1475","DOI":"10.1002\/jctb.1553","article-title":"Technologies for olive mill wastewater (OMW) treatment: A review","volume":"81","author":"Paraskeva","year":"2006","journal-title":"J. Chem. Technol. Biotechnol."},{"key":"ref_14","unstructured":"Metzler, J.B. (2006). Olive Mill Wastewater Treatment. Utilization of By-Products and Treatment of Waste in the Food Industry, Springer."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"2007","DOI":"10.1016\/j.watres.2006.03.023","article-title":"Treatment of olive oil mill wastewater by combined process electro-Fenton reaction and anaerobic digestion","volume":"40","author":"Khoufi","year":"2006","journal-title":"Water Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"832","DOI":"10.1016\/j.chemosphere.2006.10.064","article-title":"Advanced oxidation processes for the treatment of olive-oil mills wastewater","volume":"67","author":"Lobato","year":"2007","journal-title":"Chemosphere"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Hodaifa, G., Garc\u00eda, C.A., and Borja, R. (2020). Study of Catalysts\u2019 Influence on Photocatalysis\/Photodegradation of Olive Oil Mill Wastewater. Determination of the Optimum Working Conditions. Catalyst, 10.","DOI":"10.3390\/catal10050554"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1016\/j.jtice.2019.02.001","article-title":"Chemical oxidation methods for treatment of real industrial olive oil mill wastewater","volume":"97","author":"Hodaifa","year":"2019","journal-title":"J. Taiwan Inst. Chem. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1002\/(SICI)1097-4660(199711)70:3<253::AID-JCTB770>3.0.CO;2-H","article-title":"Simultaneous photodegradation and ozonation plus UV radiation of phenolic acids-major pollutants in agro-industrial wastewaters","volume":"70","author":"Benitez","year":"1997","journal-title":"J. Chem. Technol. Biotechnol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"112012","DOI":"10.1016\/j.jphotochem.2019.112012","article-title":"Heterogeneous Fenton like degradation of olive Mill wastewater using ozone in the presence of BiFeO3 photocatalyst","volume":"383","author":"Iboukhoulef","year":"2019","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1016\/j.apcatb.2003.09.010","article-title":"Degradation of chlorophenols by means of advanced oxidation processes: A general review","volume":"47","author":"Esplugas","year":"2004","journal-title":"Appl. Catal. B Environ."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1016\/j.cej.2011.08.022","article-title":"Degradation of organic matter in olive-oil mill wastewater through homogeneous Fenton-like reaction","volume":"173","author":"Nieto","year":"2011","journal-title":"Chem. Eng. J."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"743","DOI":"10.1016\/j.jclepro.2017.06.088","article-title":"Real olive oil mill wastewater treatment by photo-Fenton system using artificial ultraviolet light lamps","volume":"162","author":"Hodaifa","year":"2017","journal-title":"J. Clean. Prod."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1016\/j.psep.2015.09.002","article-title":"Use of advance oxidation process to improve the biodegradability of olive oil mill effluents","volume":"98","author":"Alver","year":"2015","journal-title":"Process. Saf. Environ. Prot."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.watres.2014.04.032","article-title":"Utilizing solar energy for the purification of olive mill wastewater using a pilot-scale photocatalytic reactor after coagulation-flocculation","volume":"60","author":"Michael","year":"2014","journal-title":"Water Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1016\/j.apcatb.2005.03.004","article-title":"Heterogeneous photo-Fenton degradation of phenolic aqueous solutions over iron-containing SBA-15 catalyst","volume":"60","author":"Calleja","year":"2005","journal-title":"Appl. Catal. B Environ."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"16186","DOI":"10.1021\/acssuschemeng.8b02968","article-title":"TiO2 Nanoparticles Anchored onto the Metal\u2013Organic Framework NH2-MIL-88B(Fe) as an Adsorptive Photocatalyst with Enhanced Fenton-like Degradation of Organic Pollutants under Visible Light Irradiation","volume":"6","author":"Li","year":"2018","journal-title":"ACS Sustain. Chem. Eng."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.cej.2012.03.031","article-title":"Synthesis of \u03b1-Fe2O3\/TiO2 nanotube arrays for photoelectro-Fenton degradation of phenol","volume":"191","author":"Cong","year":"2012","journal-title":"Chem. Eng. J."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1016\/j.jes.2020.04.033","article-title":"Ce-based catalysts used in advanced oxidation processes for organic wastewater treatment: A review","volume":"96","author":"Niu","year":"2020","journal-title":"J. Environ. Sci."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"127083","DOI":"10.1016\/j.cej.2020.127083","article-title":"A review of the recent advances on the treatment of industrial wastewaters by Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs)","volume":"406","author":"Giannakis","year":"2021","journal-title":"Chem. Eng. J."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"127191","DOI":"10.1016\/j.cej.2020.127191","article-title":"Application of iron-based materials in heterogeneous advanced oxidation processes for wastewater treatment: A review","volume":"407","author":"Luo","year":"2021","journal-title":"Chem. Eng. J."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2017","DOI":"10.2166\/wst.2009.165","article-title":"Treatment of olive-mill wastewater from a two-phase process by chemical oxidation on an industrial scale","volume":"59","author":"Nieto","year":"2009","journal-title":"Water Sci. Technol."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"127576","DOI":"10.1016\/j.foodchem.2020.127576","article-title":"Antioxidant and antimicrobial properties of tyrosol and derivative-compounds in the presence of vitamin B2. Assays of synergistic antioxidant effect with commercial food additives","volume":"335","author":"Casadey","year":"2021","journal-title":"Food Chem."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"428","DOI":"10.1016\/j.psep.2020.10.002","article-title":"Effect of the operating conditions on a nanofiltration process to separate low-molecular-weight phenolic compounds from the sugars present in olive mill wastewaters","volume":"148","year":"2021","journal-title":"Process. Saf. Environ. Prot."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1532","DOI":"10.1016\/j.procbio.2013.07.010","article-title":"Olive mill wastes: Biochemical characterizations and valorization strategies","volume":"48","author":"Dermeche","year":"2013","journal-title":"Process. Biochem."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"6962","DOI":"10.1002\/anie.200503779","article-title":"Hydrogen Peroxide Synthesis: An Outlook beyond the Anthraquinone Process","volume":"45","author":"Fierro","year":"2006","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"245","DOI":"10.1016\/j.jphotochem.2007.12.031","article-title":"Ultraviolet stimulation of hydrogen peroxide production using aminoindazole, diaminopyridine, and phenylenediamine solid polymer complexes of Zn(II)","volume":"197","author":"Hayes","year":"2008","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"22943","DOI":"10.1016\/j.matpr.2018.11.021","article-title":"Sun light transmission through silica optical fibers for lighting: An experimental study","volume":"5","author":"Patil","year":"2018","journal-title":"Mater. Today Proc."},{"key":"ref_39","unstructured":"DIN 38409-41 (1980). German Standard Methods for Examination of Water, Waste Water and Sludge; Summary Action and Material Characteristic Parameters (Group H); Determination of the Chemical Oxygen Demand (COD) in the Range over 15 mg\/L (H41), German Institute for Standardisation (Deutsches Institut f\u00fcr Normung)."},{"key":"ref_40","unstructured":"ISO 8466-1 (1990). Water Quality-Calibration and Evaluation of Analytical Methods and Estimation of Performance Characteristics\u2014Part 1: Statistical Evaluation of the Linear Calibration Function, International Organization for Standardization."},{"key":"ref_41","unstructured":"DIN 38402 A51 (1986). German Standard Methods for the Examination of Water, Waste Water and Sludge; General Information (Group A); Calibration of Analytical Methods, Evaluation of Analytical Results and Linear Calibration Functions Used to Determine the Performance Characteristics of Analytical Methods (A 51), German Institute for Standardisation (Deutsches Institut f\u00fcr Normung)."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1595","DOI":"10.1080\/10934529.2010.506116","article-title":"Replacement of chemical oxygen demand (COD) with total organic carbon (TOC) for monitoring wastewater treatment performance to minimize disposal of toxic analytical waste","volume":"45","author":"Dubber","year":"2010","journal-title":"J. Environ. Sci. Health A Tox. Hazard. Subst. Environ. Eng."}],"container-title":["Catalysts"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4344\/11\/5\/557\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:53:29Z","timestamp":1760162009000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4344\/11\/5\/557"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,4,27]]},"references-count":42,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2021,5]]}},"alternative-id":["catal11050557"],"URL":"https:\/\/doi.org\/10.3390\/catal11050557","relation":{},"ISSN":["2073-4344"],"issn-type":[{"value":"2073-4344","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,4,27]]}}}