Exploring reuse of industrial wastewater from exhaust dyebaths by solar-based photo-Fenton treatment

The aim of the research under discussion in the present paper is to study the decolorization and mineralization of textile industrial wastewaters from exhaust dyebaths by means of a solar photo-Fenton treatment. The exhaust dyebaths were grouped according to the fibers and dyeing recipes used, so as to verify the effectiveness of the photo-Fenton treatment on each dyeing process separately. Next, the results previously achieved were compared to those obtained by mixing all the exhaust baths together, as is common practice when treating the industrial textile effluents from dyeing and finishing procedures. After their neutralization and filtration, photo-Fenton-treated exhaust dyebaths and mixtures were reused to prepare laboratory dyeing samples. These techniques on the reuse of wastewaters were tested on several fibers by using the same dyeing procedure that was originally applied, as well as in different dyeing processes and for most fiber types. The results achieved showed that the reutilization of the aforementioned effluents, either in new exhaust dyebaths or in some other textile industrial operations, was of some considerable importance. Water consumption would be significantly reduced as well as the wastewater levies for the firms. Furthermore, the contaminating effect of the industrial effluents to be dealt with would be also diminished, reaping environmental and economic benefits.Sanz Carbonell, JF.; Monllor Pérez, P.; Vicente Candela, R.; Amat Payá, AM.; Arques Sanz, A.; Bonet Aracil, MA. (2013). Exploring reuse of industrial wastewater from exhaust dyebaths by solar-based photo-Fenton treatment. Textile Research Journal. 83(13):1325-1332. doi:10.1177/0040517512467061S13251332831

Photo-Fenton reaction at mildly acidic conditions: assessing the effect of bio-organic substances of different origin and characteristics through experimental design

This is an Author's Accepted Manuscript of an article published in Arlen Mabel Lastre-Acosta, Rafael Vicente, Margarita Mora, Ulises Javier Jáuregui-Haza, Antonio Arques & Antonio Carlos Silva Costa Teixeira (2019) Photo-Fenton reaction at mildly acidic conditions: assessing the effect of bio-organic substances of different origin and characteristics through experimental design, Journal of Environmental Science and Health, Part A, 54:8, 711-720 [copyright Taylor & Francis], available online at: http://www.tandfonline.com/10.1080/10934529.2019.1585721[EN] Urban-waste bio-organic substances (UW-BOS) have been shown to be capable of extending the photo-Fenton reaction to mildly acidic conditions. In this study, the effects of pH (3-7), UW-BOS, H2O2 and iron concentrations on the photo-Fenton process were systematically assessed using a Doehlert experimental design and response surface methodology for two UW-BOS (CVT230 and FORSUD). Solutions of the model antibiotic sulfadiazine (SDZ) were irradiated in a solar simulator equipped with a 550W Xenon lamp. The results showed that for UW-BOS contents below 30mg L-1, SDZ removal proceeds at pH 5 with similar rates for both CVT230 and FORSUD, regardless of Fe(III) concentration. For 50mg L-1 of UW-BOS or higher, CVT230 performs better than FORSUD, even for low Fe(III) content (1-3mg L-1). In contrast, half-life times of 35-40min can only be achieved under mildly acidic conditions with FORSUD for iron concentrations higher than 10mg L-1. The better performance of CVT230 can be associated with its high hydrophilic/hydrophobic ratio, low E2:E3, higher iron content and possibly higher yields of triplet reactive species generation upon solar irradiation. The most appropriate conditions for each UW-BOS studied are discussed for the first time, which are advantageous for possible engineered applications.The authors express their gratitude to CNPq (National Council for Scientific and Technological Development) and to the European Union (PIRSES-GA-2010-269128, EnvironBOS). This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) - Finance Code 001.Lastre-Acosta, AM.; Vicente Candela, R.; Mora Carbonell, M.; Jáuregui-Haza, UJ.; Arqués Sanz, A.; Teixeira, ACSC. (2019). Photo-Fenton reaction at mildly acidic conditions: assessing the effect of bio-organic substances of different origin and characteristics through experimental design. Journal of Environmental Science and Health Part A. 54(8):711-720. https://doi.org/10.1080/10934529.2019.1585721S711720548Ikehata, K., Jodeiri Naghashkar, N., & Gamal El-Din, M. (2006). Degradation of Aqueous Pharmaceuticals by Ozonation and Advanced Oxidation Processes: A Review. Ozone: Science & Engineering, 28(6), 353-414. doi:10.1080/01919510600985937Klavarioti, M., Mantzavinos, D., & Kassinos, D. (2009). Removal of residual pharmaceuticals from aqueous systems by advanced oxidation processes. Environment International, 35(2), 402-417. doi:10.1016/j.envint.2008.07.009Malato, S., Fernández-Ibáñez, P., Maldonado, M. I., Blanco, J., & Gernjak, W. (2009). Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends. Catalysis Today, 147(1), 1-59. doi:10.1016/j.cattod.2009.06.018Pignatello, J. J., Oliveros, E., & MacKay, A. (2006). Advanced Oxidation Processes for Organic Contaminant Destruction Based on the Fenton Reaction and Related Chemistry. Critical Reviews in Environmental Science and Technology, 36(1), 1-84. doi:10.1080/10643380500326564Wu, Y., Passananti, M., Brigante, M., Dong, W., & Mailhot, G. (2014). Fe(III)–EDDS complex in Fenton and photo-Fenton processes: from the radical formation to the degradation of a target compound. Environmental Science and Pollution Research, 21(21), 12154-12162. doi:10.1007/s11356-014-2945-1Klamerth, N., Malato, S., Agüera, A., & Fernández-Alba, A. (2013). Photo-Fenton and modified photo-Fenton at neutral pH for the treatment of emerging contaminants in wastewater treatment plant effluents: A comparison. Water Research, 47(2), 833-840. doi:10.1016/j.watres.2012.11.008Bernabeu, A., Palacios, S., Vicente, R., Vercher, R. F., Malato, S., Arques, A., & Amat, A. M. (2012). Solar photo-Fenton at mild conditions to treat a mixture of six emerging pollutants. Chemical Engineering Journal, 198-199, 65-72. doi:10.1016/j.cej.2012.05.056Gomis, J., Gonçalves, M. G., Vercher, R. F., Sabater, C., Castillo, M.-A., Prevot, A. B., … Arques, A. (2015). Determination of photostability, biocompatibility and efficiency as photo-Fenton auxiliaries of three different types of soluble bio-based substances (SBO). Catalysis Today, 252, 177-183. doi:10.1016/j.cattod.2014.10.015Gomis, J., Carlos, L., Prevot, A. B., Teixeira, A. C. S. C., Mora, M., Amat, A. M., … Arques, A. (2015). Bio-based substances from urban waste as auxiliaries for solar photo-Fenton treatment under mild conditions: Optimization of operational variables. Catalysis Today, 240, 39-45. doi:10.1016/j.cattod.2014.03.034Gomis, J., Vercher, R. F., Amat, A. M., Mártire, D. O., González, M. C., Bianco Prevot, A., … Carlos, L. (2013). Application of soluble bio-organic substances (SBO) as photocatalysts for wastewater treatment: Sensitizing effect and photo-Fenton-like process. Catalysis Today, 209, 176-180. doi:10.1016/j.cattod.2012.08.036Montoneri, E., Boffa, V., Savarino, P., Perrone, D., Ghezzo, M., Montoneri, C., & Mendichi, R. (2011). Acid soluble bio-organic substances isolated from urban bio-waste. Chemical composition and properties of products. Waste Management, 31(1), 10-17. doi:10.1016/j.wasman.2010.08.029Arques, A., & Bianco Prevot, A. (Eds.). (2015). Soluble Bio-based Substances Isolated From Urban Wastes. SpringerBriefs in Molecular Science. doi:10.1007/978-3-319-14744-4Bianco Prevot, A., Fabbri, D., Pramauro, E., Baiocchi, C., Medana, C., Montoneri, E., & Boffa, V. (2010). Sensitizing effect of bio-based chemicals from urban wastes on the photodegradation of azo-dyes. Journal of Photochemistry and Photobiology A: Chemistry, 209(2-3), 224-231. doi:10.1016/j.jphotochem.2009.11.020Bianco Prevot, A., Avetta, P., Fabbri, D., Laurenti, E., Marchis, T., Perrone, D. G., … Boffa, V. (2010). Waste-Derived Bioorganic Substances for Light-Induced Generation of Reactive Oxygenated Species. ChemSusChem, 4(1), 85-90. doi:10.1002/cssc.201000237Carlos, L., Mártire, D. O., Gonzalez, M. C., Gomis, J., Bernabeu, A., Amat, A. M., & Arques, A. (2012). Photochemical fate of a mixture of emerging pollutants in the presence of humic substances. Water Research, 46(15), 4732-4740. doi:10.1016/j.watres.2012.06.022Mohajerani, M., Mehrvar, M., & Ein-Mozaffari, F. (2012). Using an external-loop airlift sonophotoreactor to enhance the biodegradability of aqueous sulfadiazine solution. Separation and Purification Technology, 90, 173-181. doi:10.1016/j.seppur.2012.02.025Conde-Cid, M., Álvarez-Esmorís, C., Paradelo-Núñez, R., Nóvoa-Muñoz, J. C., Arias-Estévez, M., Álvarez-Rodríguez, E., … Núñez-Delgado, A. (2018). Occurrence of tetracyclines and sulfonamides in manures, agricultural soils and crops from different areas in Galicia (NW Spain). Journal of Cleaner Production, 197, 491-500. doi:10.1016/j.jclepro.2018.06.217Amat, A. M., Arques, A., García-Ripoll, A., Santos-Juanes, L., Vicente, R., Oller, I., … Malato, S. (2009). A reliable monitoring of the biocompatibility of an effluent along an oxidative pre-treatment by sequential bioassays and chemical analyses. Water Research, 43(3), 784-792. doi:10.1016/j.watres.2008.11.017Ferreira, S. L. ., dos Santos, W. N. ., Quintella, C. M., Neto, B. B., & Bosque-Sendra, J. M. (2004). Doehlert matrix: a chemometric tool for analytical chemistry—review. Talanta, 63(4), 1061-1067. doi:10.1016/j.talanta.2004.01.015Gomis, J., Bianco Prevot, A., Montoneri, E., González, M. C., Amat, A. M., Mártire, D. O., … Carlos, L. (2014). Waste sourced bio-based substances for solar-driven wastewater remediation: Photodegradation of emerging pollutants. Chemical Engineering Journal, 235, 236-243. doi:10.1016/j.cej.2013.09.009Silva, M. P., Lastre-Acosta, A. M., Mostafa, S., McKay, G., Linden, K. G., Rosario-Ortiz, F. L., & Teixeira, A. C. S. C. (2017). Photochemical generation of reactive intermediates from urban-waste bio-organic substances under UV and solar irradiation. 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Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study

[EN] In this work, analysis of excitation-emission-matrices (EEM) has been employed to gain further insight into the characterization of humic like substances (HLS) obtained from urban wastes (soluble bio-organic substances, SBOs). In particular, complexation of these substances with iron and changes along a photo-Fenton process have been studied. Recorded EEMs were decomposed by using parallel factor analysis (PARAFAC). Three fluorescent components were identified by PARAFAC modeling of the entire set of SBO solutions studied. The EEM peak locations (lambda(ex)/lambda(em)) of these components were 310-330 nm/400-420 nm (C1), 340-360 nm/450-500 nm (C2), and 285 nm/335-380 nm (C3). Slight variations of the maximum position of each component with the solution pH were observed. The interaction of SBO with Fe(III) was characterized by determining the stability constants of the components with Fe(III) at different pH values, which were in the order of magnitude of the ones reported for humic substances and reached their highest values at pH = 5. Photochemical experiments employing SBO and Fe(III), with and without H2O2, showed pH-dependent trends for the evolution of the modeled components, which exhibited a strong correlation with the efficiency reported for the photo-Fenton processes in the presence of SBO at different pH values.This work was supported by Generalitat Valenciana, Conselleria d'Ecuacio, Cultura i esport, Spain (GV/2015/074), Spanish Ministerio de Economia y Competitividad (CTQ2015-69832-C4-4-R) and by the Marie Sklodowska-Curie Research and Innovation Staff Exchange project funded by the European Commission H2020-MSCA-RISE-2014 (Project number: 645551). F. S. G. E. and L. C. are researchers from CONICET, Argentina.García-Ballesteros, S.; Constante, M.; Vicente Candela, R.; Mora Carbonell, M.; Amat Payá, AM.; Arques Sanz, A.; Carlos, L.... (2017). Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study. Photochemical & Photobiological Sciences. 16:38-45. https://doi.org/10.1039/c6pp00236fS384516Malato, S., Fernández-Ibáñez, P., Maldonado, M. I., Blanco, J., & Gernjak, W. (2009). Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends. Catalysis Today, 147(1), 1-59. doi:10.1016/j.cattod.2009.06.018WANG, J. L., & XU, L. J. (2012). Advanced Oxidation Processes for Wastewater Treatment: Formation of Hydroxyl Radical and Application. Critical Reviews in Environmental Science and Technology, 42(3), 251-325. doi:10.1080/10643389.2010.507698Pignatello, J. J., Oliveros, E., & MacKay, A. (2006). Advanced Oxidation Processes for Organic Contaminant Destruction Based on the Fenton Reaction and Related Chemistry. Critical Reviews in Environmental Science and Technology, 36(1), 1-84. doi:10.1080/10643380500326564Papoutsakis, S., Miralles-Cuevas, S., Oller, I., Garcia Sanchez, J. L., Pulgarin, C., & Malato, S. (2015). Microcontaminant degradation in municipal wastewater treatment plant secondary effluent by EDDS assisted photo-Fenton at near-neutral pH: An experimental design approach. Catalysis Today, 252, 61-69. doi:10.1016/j.cattod.2015.02.005Klamerth, N., Malato, S., Agüera, A., & Fernández-Alba, A. (2013). Photo-Fenton and modified photo-Fenton at neutral pH for the treatment of emerging contaminants in wastewater treatment plant effluents: A comparison. Water Research, 47(2), 833-840. doi:10.1016/j.watres.2012.11.008De Luca, A., Dantas, R. F., & Esplugas, S. (2015). Study of Fe(III)-NTA chelates stability for applicability in photo-Fenton at neutral pH. 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Degradation of 32 emergent contaminants by UV and neutral photo-fenton in domestic wastewater effluent previously treated by activated sludge. Water Research, 46(6), 1947-1957. doi:10.1016/j.watres.2012.01.014Gomis, J., Vercher, R. F., Amat, A. M., Mártire, D. O., González, M. C., Bianco Prevot, A., … Carlos, L. (2013). Application of soluble bio-organic substances (SBO) as photocatalysts for wastewater treatment: Sensitizing effect and photo-Fenton-like process. Catalysis Today, 209, 176-180. doi:10.1016/j.cattod.2012.08.036Gomis, J., Carlos, L., Prevot, A. B., Teixeira, A. C. S. C., Mora, M., Amat, A. M., … Arques, A. (2015). Bio-based substances from urban waste as auxiliaries for solar photo-Fenton treatment under mild conditions: Optimization of operational variables. Catalysis Today, 240, 39-45. doi:10.1016/j.cattod.2014.03.034Gomis, J., Bianco Prevot, A., Montoneri, E., González, M. C., Amat, A. M., Mártire, D. O., … Carlos, L. (2014). 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Treatment and reuse of textile wastewaters by mild solar photo-Fenton in the presence of humic-like substances

The final publication is available at Springer via http://dx.doi.org/10.1007/s11356-016-7889-1In this paper, the possibility of reusing textile effluents for new dyeing baths has been investigated. For this purpose, different trichromies using Direct Red 80, Direct Blue 106, and Direct Yellow 98 on cotton have been used. Effluents have been treated by means of a photo-Fenton process at pH 5. Addition of humic-like substances isolated form urban wastes is necessary in order to prevent iron deactivation because of the formation of non-active iron hydroxides. Laboratory-scale experiments carried out with synthetic effluents show that comparable results were obtained when using as solvent water treated by photo-Fenton with SBO and fresh deionized water. Experiments were scaled up to pilot plant illuminated under sunlight, using in this case a real textile effluent. Decoloration of the effluent could be achieved after moderate irradiation and cotton dyed with this water presented similar characteristics as when deionized water was used.This work was realized with the financial support of a Marie Sklodowska-Curie Research and Innovation Staff Exchange project funded by the European Commission H2020-MSCA-RISE-2014 within the framework of the research project Mat4treaT (project number 645551). Financial support from Spanish Government (CTQ2015-69832-C4-4-R) is gratefully acknowledged. The authors acknowledge the financial support of the Generalitat Valenciana, Conselleria d’Educació, Cultura i Esport (GV/AICO/2015/124) and CTQ2015-69832-C4-4-R.García-Negueroles, P.; Bou-Belda, E.; Santos-Juanes Jordá, L.; Amat Payá, AM.; Arques Sanz, A.; Vercher Pérez, RF.; Monllor Pérez, P.... (2017). Treatment and reuse of textile wastewaters by mild solar photo-Fenton in the presence of humic-like substances. 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A new methodology to assess the performance of AOPs in complex samples: Application to the degradation of phenolic compounds by O3 and O3/UV-A Vis

[EN] A methodology combining experimental design methodology, liquid chromatography, excitation emission matrixes (EEM) and bioassays has been applied to study the performance of O3 and O3/UVA-vis in the treatment of a mixture of eight phenolic pollutants. An experimental design methodology based on Doehlert matrixes was employed to determine the effect of pH (between 3 and 12), ozone dosage (02¿1.0¿g/h) and initial concentration of the pollutants (1¿6¿mg/L each). The following conclusions were obtained: a) acidic pH and low O3 dosage resulted in an inefficient process, b) increasing pH and O3 amount produced an enhancement of the reaction, and c) interaction of basic pH and high amounts of ozone decreased the efficiency of the process. The combination of O3/UVA-vis was able to enhance ozonation in those experimental regions were this reagent was less efficient, namely low pH and low ozone dosages. The application of EEM-PARAFAC showed four components, corresponding to the parent pollutants and three different groups of reaction product and its evolution with time. Bioassys indicated important detoxification (from 100% to less than 30% after 1¿min of treatment with initial pollutant concentration of 6¿mg/L, pH¿=¿9 and ozone dosage of 0.8¿g/h) according to the studied methods (D. magna and P. subcapitata). Also estrogenic activity and dioxin-like behavior were significantly decreased.The authors thank the financial support of the European Union(PIRSES-GA-2010-269128, EnvironBOS) and Spanish Ministerio de Educación y Ciencia (CTQ2015-69832-C4-4-R). Sara García-Ballesteros thanks Spanish Ministerio de Economía y Competitividad for providing her fellowship (BES-2013-066201).García-Ballesteros, S.; Mora Carbonell, M.; Vicente Candela, R.; Vercher Pérez, RF.; Sabater Marco, C.; Castillo López, M.; Amat Payá, AM.... (2019). A new methodology to assess the performance of AOPs in complex samples: Application to the degradation of phenolic compounds by O3 and O3/UV-A Vis. Chemosphere. 222:114-123. https://doi.org/10.1016/j.chemosphere.2019.01.015S11412322

Humic like substances extracted from oil mill wastes in photo-Fenton processes: Characterization, performance and toxicity assesment

[EN] Olive mill waste has been used as sourcing materials for the isolation of humic like substances (OMW-HLS) which have demonstrated its capacity to expand the range of applicability of photo-Fenton process to pH= 5. During the isolation process, membranes of three different pore sizes (300 kDa, 150 kDa and 50 kDa) were employed in order to obtain three batches of OMW-HLS. Four pollutants contained in 2013/39/EC were used as target substances: terbutryn (TBT), diclofenac (DCF), chlorfenvinphos (CVF) and pentachlorophenol (PCP). Results showed that OMW-HLS was able to enhance photo-Fenton at pH = 5, but differences were not significant, either among fractions or with commercial humic substances. Reactions were scaled-up and driven under real sunlight and pollutants removal was faster in the presence of OMW-HLS. Toxicity was monitored according to bioassays based on different organisms or cell lines. Detoxification was observed with and without OMW-HLS, although higher toxicity was detected in the presence of humic acids, most probably due to the surfactant effect, that allows a better contact between pollutant and organism.The authors thank the financial support of the European Union H2020 (2018-2022) (Ref. 776816) Proyect O, and Spanish Ministerio de Ciencia, Innovacion y Universidad (RTI 2018-097997-B-C31) . Paula Garcia Negueroles thanks Spanish Ministerio de Ciencia, Innovacion y Universidades for providing their fellowships BES-2016-0777962.García-Negueroles, P.; García-Ballesteros, S.; Santos-Juanes Jordá, L.; Sabater Marco, C.; Castillo López, M.; López Pérez, MF.; Vicente Candela, R.... (2021). Humic like substances extracted from oil mill wastes in photo-Fenton processes: Characterization, performance and toxicity assesment. Journal of Environmental Chemical Engineering. 9(6):1-8. https://doi.org/10.1016/j.jece.2021.106862189

New Route for Valorization of Oil Mill Wastes: Isolation of Humic-Like Substances to be Employed in Solar-Driven Processes for Pollutants Removal

[EN] The valorization of olive oil mill solid wastes (OMW) has been addressed by considering it as a possible source of humic-like substances (HLSs), to be used as auxiliary substances for photo-Fenton, employing caffeine as a target pollutant to test the efficiency of this approach. The OMW-HLS isolation encompassed the OMW basic hydrolysis, followed by ultrafiltration and drying. OMW-HLS structural features have been investigated by means of laser light scattering, fluorescence, size exclusion chromatography, and thermogravimetric analysis; moreover, the capability of OMW-HLS to generate reactive species under irradiation has been investigated using spin-trap electronic paramagnetic resonance. The caffeine degradation by means of photo-Fenton process driven at pH = 5 was significantly increased by the addition of 10 mg/L of OMW-HLS. Under the mechanistic point of view, it could be hypothesized that singlet oxygen is not playing a relevant role, whereas other oxidants (mainly OH center dot radicals) can be considered as the key species in promoting caffeine degradation.Authors want to acknowledge the financial support of Spanish Ministerio de Economia y Competitividad (CTQ2015-69832-C04) and European Union (645551-RISE-2014, MAT4-TREAT).García-Ballesteros, S.; Grimalt, J.; Berto, S.; Minella, M.; Laurenti, E.; Vicente Candela, R.; López Pérez, MF.... (2018). New Route for Valorization of Oil Mill Wastes: Isolation of Humic-Like Substances to be Employed in Solar-Driven Processes for Pollutants Removal. ACS Omega. 3(10):13073-13080. https://doi.org/10.1021/acsomega.8b01816S130731308031

Reutilización en nuevas tinturas de aguas industriales reales tratadas mediante proceso foto-Fenton (I)

[EN] Textile wastewaters have a potential impact on the environment, therefore, reuse of these effluents represents an economic and ecological benefit. The appropriate depuration by firms after textile dyeing and finishing operations needs the application of efficient and adequate wastewater treatments. Processes known as Advanced Oxidation Processes (AOP) used in the decolorization and mineralization of wastewaters are extremely effective. AOPs using solar light, as the photo-Fenton process, are especially interesting for the treatment of textile effluents. 99% decrease in absorbance of the industrial textile effluents treated, from exhausting dyeing, has led to its re-use in new laboratory dyeing of several textile materials, by using a range of dyestuffs with diverse chromoferes.[ES] Los efluentes generados por las industrias textiles representan un problema potencial para el medioambiente. Su tratamiento antes de ser liberados en cauces públicos o estaciones depuradoras de aguas residuales (EDAR), implica la aplicación de tratamientos eficientes. Las técnicas conocidas como Procesos Avanzados de Oxidación PAOs para la depuración de aguas son especialmente efectivas, tanto por su elevada reactividad como por su poca selectividad oxidativa. Entre los PAOs, los procesos foto-Fenton resultan muy interesantes para el tratamiento de efluentes textiles, especialmente aquellos que emplean la luz del sol. La disminución del 99% en la absorbancia de los efluentes industriales, de tintura por agotamiento, tratados, ha permitido su reutilización para tintar a escala de laboratorio diferentes materias textiles con diversas familias de colorantes.Sanz, JF.; Monllor Pérez, P.; Vicente Candela, R.; Vercher Pérez, RF. (2012). Reutilización en nuevas tinturas de aguas industriales reales tratadas mediante proceso foto-Fenton (I). Revista de Química e Industria Textil. (207):40-49. http://hdl.handle.net/10251/73661S404920

Competencias transversales en la asignatura “Tecnología Medioambiental”

Resumen de los autoresGrado en Ingeniería Eléctrica (Universidad Politécnica de Valencia)Durante el desarrollo universitario se considera fundamental no solo trabajar las capacidades intelectuales, también las actitudes relacionadas con el desarrollo personal, que no dependen de un ámbito temático o disciplinario específico y que se manifiestan en la actuación profesional. El Proyecto institucional de implantación de las competencias transversales UPV fue una iniciativa del Vicerrectorado de Estudios, Calidad y Acreditación, que tiene como objetivo principal certificar los niveles de los alumnos en estas competencia. El curso académico 2014/15 fue el de la experiencia piloto y el curso académico 2015/16 fue ya el del comienzo de la implantación definitiva del proyecto. El resultado del listado definitivo de las trece competencias transversales UPV pretende garantizar que se cubren todos los aspectos que reflejan los listados de la agencia americana Accreditation Board for Engineering and Technology, (ABET), más el sello EUR-ACE que concede la agencia European Network for Accreditation of Engineering Education (ENNAEE), más los de los Reales Decretos (RD) españoles.ES

Polyamide 6.6 Degradation through Photo-Fenton Process

[EN] Synthetic polymers have become essential in our life, nevertheless, the high production and the low recycling around the world have caused serious problems of contamination in soil and water. In addition, its fragmentation into microplastics in environmental conditions has exacerbated the ecological problems due to its possible ingestion by organisms and its high capacity to transport and release a wide variety of organic pollutants. Photo-Fenton process was used to evaluated its capacity to degrade PA6.6 microplastic under simulated solar irradiation and natural solar irradiation plus LED visible light in order to get a best knowledge about its behavior in environmental conditions. PA6.6 was degraded for 7 h through photo-Fenton process under simulated solar irradiation. Superficial defects were observed along the PA6.6 microplastic after degradation experiments. However, FT-IR analysis did not show the formation of additional bands which indicated the formation of new products. DSC analysis showed changes in the melting point of the PA6.6 after the photo-Fenton treatment at different times. The assays carried out under natural solar irradiation showed lower degradation of the PA6.6 under the same experimental conditions, nevertheless, it was observed an increase of the specific surface area 90 times higher in the PA6.6 treated for 10 h.The authors wish to thank the Spanish Ministry of Science, Innovation and Universities (MCIU) for funding under the CalypSol Project (Reference: RTI2018-097997-B-C31-AR). PhD Scholarship from CONACYT for E. Marcelino-Perez (709357) is acknowledged.Marcelino-Pérez, E.; Bonet-Aracil, M.; Bou-Belda, E.; Amat Payá, AM.; Arqués Sanz, A.; Vicente Candela, R. (2022). Polyamide 6.6 Degradation through Photo-Fenton Process. Materials Science Forum. 1063:243-252. https://doi.org/10.4028/p-28e9b7243252106