Contaminants of emerging concern: a review of new approach in AOP technologies

Salimi, Maryam; Esrafili, Ali; Gholami, Mitra; Jafari, Ahmad Jonidi; Kalantary, Roshanak Rezaei; Farzadkia, Mahdi; Kermani, Majid; Sobhi, Hamid Reza

doi:10.1007/s10661-017-6097-x

Cited by 216 publications

(100 citation statements)

References 180 publications

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“…4 la generación de H 2 O 2 a través de la reducción de oxígeno en la superficie del cátodo [26] , (5) y la adición o producción de Fe 2+ desde el ánodo [27] , (6) que conduce a la generación de radicales • OH activos. Adicionalmente, el Fe 2+ puede ser regenerado por medio de la reducción de Fe 3+ en el cátodo [28] , (7) creando también en el ánodo radicales • OH con la oxidación del H 2 O [27] . (8) Los factores que se ha reconocido que influyen en electro-Fenton son [29] : 1) concentración de la relación Fe 2+ /Fe 3+ , 2) concentración de H 2 O 2 , 3) concentración inicial de contaminantes, 4) pH, 5) electrolito como Na 2 SO 4 , KCl, NaCl, NaNO 3 o NaClO 4 en el rango de 50 a 100 mM, 6) velocidad de rociado de oxígeno, 7) modo de alimentación de oxígeno, 8) densidad de corriente, 9) temperatura de operación, 10) materiales electródicos y 11) distancia entre electrodos.…”

Section: B1 Fentonunclassified

“…Las estructuras químicas de los compuestos señalados, se muestran en la Figura 1. Los edulcorantes no son metabolizados convencionalmente como los carbohidratos [7] , lo cual, aunado a la alta ingesta según las relaciones de producción-de-manda [8] , ha provocado la proliferación de diversos compuestos como acesulfamo, sacarina, sucralosa, aspartamo y ciclamato en el agua residual, subterránea, superficial y potable [9] . Una vez que los edulcorantes ingresan a los cuerpos de agua, los subproductos obtenidos por fotodegradación son más tóxicos que los compuestos originales [10] .…”

Section: Introductionunclassified

“…En ese contexto, los edulcorantes artificiales, debido a su relativamente reciente y frecuente detección en numerosos ambientes, han sido considerados como contaminantes emergentes [11] , especialmente la sacarina, el ciclamato, el acesulfamo y la sucralosa [12] . Por consiguiente, la remoción de esos contaminantes del agua se proyecta como una situación de extrema relevancia en la que los Procesos de Oxidación Avanzada (POA) son una alternativa interesante [7] .…”

Section: Introductionunclassified

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Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Juárez¹

2020

CULCYT

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RESUMENEl objetivo de la presente revisión es presentar investigaciones recientes sobre la remoción de algunos edulcorantes -reconocidos como contaminantes emergentes-del agua o matrices acuosas, utilizando los Procesos de Oxidación Avanzada (POA). En un intento por evadir el consumo de endulzantes calóricos que han provocado problemas de salud, los seres humanos consumen edulcorantes artificiales que prácticamente no se metabolizan después de ingerirse, de esa forma se integran al agua residual e inclusive resisten la degradación total en las plantas de tratamiento de agua convencionales. Por tanto, en bases de datos se revisaron electrooxidación, electro-Fenton, foto-Fenton, fotocatálisis heterogénea, oxidación por ultravioleta/peróxido y oxidación por ultravioleta/ozono, catalogados como POA. Estos procesos son una alternativa debido a que generan radicales hidroxilo ·OH, caracterizados por su alto poder oxidante. La electrooxidación se puede declarar como la más conveniente para la degradación de edulcorantes artificiales como el acesulfamo de potasio, por ejemplo, debido a la menor cantidad de componentes requeridos para su ejecución y, al mismo tiempo, se logra una eficiencia de remoción similar, o incluso mayor, comparada con otros POA. Igualmente, se documentaron los resultados y méritos relativos a la aplicación de estos al agua o matrices acuosas, así como las oportunidades para investigación futura. ABSTRACTThe objective of this review is to present recent research on the removal of some sweeteners-recognized as emerging contaminants-from water or aqueous matrices, using the Advanced Oxidation Processes (AOPs). In an attempt to evade the consumption of caloric sweeteners that has caused health problems, humans consume artificial sweeteners that are practically not metabolized after ingestion, thus integrating into wastewater and even resisting total degradation in plants conventional water treatment. Therefore, electro-oxidation, electro-Fenton, photo-Fenton, heterogeneous photocatalysis, ultraviolet / peroxide oxidation and ultraviolet / ozone oxidation cataloged as AOPs were reviewed in databases. These processes are an alternative because they generate hydroxyl radicals ·OH characterized by their high oxidizing power. Electro-oxidation can be declared as the most convenient for the degradation of artificial sweeteners such as potassium acesulfame, for example, due to the lower amount of components required for its execution and at the same time the achievement of a similar removal efficiency, or even greater, compared to other AOPs. Likewise, the results and merits related to their application to water or aqueous matrices were documented, as well as the opportunities for future research.

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Section: B1 Fentonunclassified

Section: Introductionunclassified

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Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Juárez¹

2020

CULCYT

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“…Advanced oxidation processes (AOPs) utilizing highly reactive oxidizing radicals have been widely employed and have shown excellent performance in the degradation of persistent organics [9][10][11][12][13]. Over the last decade, ozonation has become one of the most effective AOP processes for the removal of organic pollutants, due to its ability to both decrease toxicity and increase biodegradability [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Improved Ozonation Efficiency for Polymerization Mother Liquid from Polyvinyl Chloride Production Using Tandem Reactors

et al. 2019

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Polymerization mother liquid (PML) is one of the main sources of wastewater in the chlor-alkali industry. The effective degradation of the PML produced in PVC polymerization using three or five ozone reactors in tandem was designed with a focus on improving the ozonation efficiency. The ozonation efficiency of the tandem reactors for the degradation of PML, along with the effect of ozone concentration, the number of reactors utilized in series, and the reaction time on the chemical oxygen demand (COD) removal were investigated in detail. The results showed that the COD removal increased as the ozone concentration was increased from 10.6 to 60 mg·L−1, achieving 66.4% COD removal at ozone concentration of 80.6 mg·L−1. However, when the ozone concentration was increased from 60 mg·L−1 to 80 mg·L−1, the COD removal only increased very little. The COD decreased with increasing ozone concentration. During the initial degradation period, the degradation rate was the highest at both low and high ozone concentrations. The degradation rate decreased with reaction time. The rate at a low ozone concentration decreased more significantly than at high ozone concentration. Although high ozone concentration is desirable for COD removal and degradation rate, the utilization efficiency of ozone decreased with increasing ozone concentration. The ozone utilization efficiency of the five-reactor device was three times higher than that of three tandem reactors, demonstrating that ozonation utilization efficiency can be improved by increasing the number of tandem reactors. Ozonation in tandem reactors is a promising approach for PML treatment.

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“…Recent studies have identified the presence of contaminants of emerging concern (CECs) in effluents and in receiving waters, where CECs can potentially affect aquatic organisms [2]. The presence of CECs, such as pharmaceuticals, personal care products, or pesticides in the body of water, produces a major challenge to human health and ecosystems [3]. CECs are not completely removed during wastewater treatments, and as a result, they are discharged into the receiving streams and can end up in soils when the sewage sludge generated is employed as a fertilizer [4].…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic Kinetic Study and Nitrogen Removal of a Membrane Bioreactor System Treating Real Urban Wastewater under a Pharmaceutical Compounds Shock: Effect of the Operative Variables

Monteoliva-García

Leyva‐Díaz

López-López

et al. 2019

Water

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Numerous studies have analyzed the viability of the biodegradation and removal of different compounds of emerging concern in biological systems for wastewater treatment. However, the effect on the heterotrophic biomass of organic matter removal is sometimes missed. The aim of the present research was to study the effect of the addition of a mix of three pharmaceuticals (carbamazepine, ciprofloxacin, and ibuprofen) on the behavior of the biomass in two different membrane-based biological systems treating urban wastewater. The present research studied a membrane bioreactor (MBR) pilot plant operating at a similar mixed liquor suspended solids (MLSS) concentration (about 5.5 g/L). This system works as an MBR and is combined with a moving bed biofilm reactor (MBBR-MBR) to treat real urban wastewater at 6 and 10 h of hydraulic retention time (HRT) under three different shocks of pharmaceuticals with increasing concentrations. In all cases, the organic matter removal was, in average terms, higher than about 92% of biochemical oxygen demand on the fifth day (BOD5), 79% of chemical oxygen demand (COD), and 85% of total organic carbon (TOC). Nevertheless, the removal is higher in the MBBR-MBR technology under the same HRT and the MLSS is similar. Moreover, the removal increased during the shock of pharmaceutical compounds, especially in the MBR technology. From a kinetic perspective, MBBR-MBR is more suitable for low HRT (6 h) and MBR is more effective for high HRT (10 h). This could be due to the fact that biofilm systems are less sensitive to hostile environments than the MBR systems. The removal of N-NH4+ decreased considerably when the pharmaceutical compounds mix was introduced into the system until no removal was detected in cycle 1, even when biofilm was present.

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Contaminants of emerging concern: a review of new approach in AOP technologies

Cited by 216 publications

References 180 publications

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Improved Ozonation Efficiency for Polymerization Mother Liquid from Polyvinyl Chloride Production Using Tandem Reactors

Heterotrophic Kinetic Study and Nitrogen Removal of a Membrane Bioreactor System Treating Real Urban Wastewater under a Pharmaceutical Compounds Shock: Effect of the Operative Variables

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