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This work studied the removal of phenol from industrial effluents through catalytic ozonation in the presence of granular activated carbon in a continuous fixed-bed reactor. Phenol was chosen as model pollutant because of its environmental impact and high toxicity. Based on the evolution of total organic carbon (TOC) and phenol concentration, a kinetic model was proposed to study the effect of the operational variables on the combined adsorption–oxidation (Ad/Ox) process. The proposed three-phase model expressed the oxidation phenomena in the liquid and the adsorption and oxidation on the surface of the granular activated carbon in the form of two kinetic constants, k1 and k2 respectively. The interpretation of the constants allow to study the benefits and behaviour of the use of activated carbon during the ozonisation process under different conditions affecting adsorption, oxidation, and mass transfer. Additionally, the calculated kinetic parameters helped to explain the observed changes in treatment efficiency. The results showed that phenol would be completely removed at an effective contact time of 3.71 min, operating at an alkaline pH of 11.0 and an ozone gas concentration of 19.0 mg L−1. Under these conditions, a 97.0% decrease in the initial total organic carbon was observed.
Cristian Ferreiro; Ana de Luis; Natalia Villota; Jose María Lomas; José Ignacio Lombraña; Luis Miguel Camarero. Application of a Combined Adsorption−Ozonation Process for Phenolic Wastewater Treatment in a Continuous Fixed-Bed Reactor. Catalysts 2021, 11, 1014 .
AMA StyleCristian Ferreiro, Ana de Luis, Natalia Villota, Jose María Lomas, José Ignacio Lombraña, Luis Miguel Camarero. Application of a Combined Adsorption−Ozonation Process for Phenolic Wastewater Treatment in a Continuous Fixed-Bed Reactor. Catalysts. 2021; 11 (8):1014.
Chicago/Turabian StyleCristian Ferreiro; Ana de Luis; Natalia Villota; Jose María Lomas; José Ignacio Lombraña; Luis Miguel Camarero. 2021. "Application of a Combined Adsorption−Ozonation Process for Phenolic Wastewater Treatment in a Continuous Fixed-Bed Reactor." Catalysts 11, no. 8: 1014.
The water–development nexus is essential for the advancement and progress of cities in the face of problems such as climate change, water security and increasing environmental stress in the agricultural sector. Aiming for a circular economy and, at the same time, improving the resilience of water supply alternatives and achieving a goal of zero waste, this work presents a technical–economic study of a novel continuous ultrafiltration (c-UF) system with self-cleaning capacity coupled to an ozonation process, for the treatment of urban WWTP effluent. The removal efficiencies achieved were analysed both through macroscopic parameters (suspended solids, turbidity) and for the most frequently occurring contaminants of emerging concern (CECs). Consequently, an effluent suitable for irrigation was obtained, with a total recovery factor of 97.92%, a concentration of suspended solids (SS) below 1 mg L−1, 0.06 NTU turbidity and toxicity free, complying with the new European Regulation on Water Reuse (EU 2020/741). A comparative analysis of the proposed process with regard to conventional tertiary treatment revealed that the proposed process was 39.1% more economic, with a cost of 0.0325 € m−3. This alternative treatment will be of great interest because of its favourable technical–economic characteristics, being postulated as a basic process for implementation in modern water reuse plants.
Cristian Ferreiro; Natalia Villota; Ana de Luis; José Lombraña; Nestor Etxebarria; Jose Lomas. Water Reuse Study from Urban WWTPs via c-Ultrafiltration and Ozonation Technologies: Basis for Resilient Cities and Agriculture. Agronomy 2021, 11, 322 .
AMA StyleCristian Ferreiro, Natalia Villota, Ana de Luis, José Lombraña, Nestor Etxebarria, Jose Lomas. Water Reuse Study from Urban WWTPs via c-Ultrafiltration and Ozonation Technologies: Basis for Resilient Cities and Agriculture. Agronomy. 2021; 11 (2):322.
Chicago/Turabian StyleCristian Ferreiro; Natalia Villota; Ana de Luis; José Lombraña; Nestor Etxebarria; Jose Lomas. 2021. "Water Reuse Study from Urban WWTPs via c-Ultrafiltration and Ozonation Technologies: Basis for Resilient Cities and Agriculture." Agronomy 11, no. 2: 322.
Arritokieta Ortuzar-Iragorri; Amaia Menéndez; Ana De Luis; Maite De Blas; Blanca María Caballero; Aitziber Iriondo. STUDENT PERCEPTION ON THE FLIPPED CLASSROOM TECHNIQUE, THE USE OF ILLUSTRATIVE VIDEOS AND THE INTERACTIVE PHET TOOL. ICERI2020 Proceedings 2020, 5335 -5339.
AMA StyleArritokieta Ortuzar-Iragorri, Amaia Menéndez, Ana De Luis, Maite De Blas, Blanca María Caballero, Aitziber Iriondo. STUDENT PERCEPTION ON THE FLIPPED CLASSROOM TECHNIQUE, THE USE OF ILLUSTRATIVE VIDEOS AND THE INTERACTIVE PHET TOOL. ICERI2020 Proceedings. 2020; ():5335-5339.
Chicago/Turabian StyleArritokieta Ortuzar-Iragorri; Amaia Menéndez; Ana De Luis; Maite De Blas; Blanca María Caballero; Aitziber Iriondo. 2020. "STUDENT PERCEPTION ON THE FLIPPED CLASSROOM TECHNIQUE, THE USE OF ILLUSTRATIVE VIDEOS AND THE INTERACTIVE PHET TOOL." ICERI2020 Proceedings , no. : 5335-5339.
Analysis of phenol ozonation using a G–L–S model: through mass transfer, chemical reaction and adsorption parameters.
Cristian Ferreiro; Natalia Villota; Ana de Luis; Jose Ignacio Lombraña. Analysis of the effect of the operational conditions in a combined adsorption–ozonation process with granular activated carbon for the treatment of phenol wastewater. Reaction Chemistry & Engineering 2020, 5, 760 -778.
AMA StyleCristian Ferreiro, Natalia Villota, Ana de Luis, Jose Ignacio Lombraña. Analysis of the effect of the operational conditions in a combined adsorption–ozonation process with granular activated carbon for the treatment of phenol wastewater. Reaction Chemistry & Engineering. 2020; 5 (4):760-778.
Chicago/Turabian StyleCristian Ferreiro; Natalia Villota; Ana de Luis; Jose Ignacio Lombraña. 2020. "Analysis of the effect of the operational conditions in a combined adsorption–ozonation process with granular activated carbon for the treatment of phenol wastewater." Reaction Chemistry & Engineering 5, no. 4: 760-778.
This work presents a case study of a wastewater treatment plant (WWTP), located in Biscay (Spain), in which the removal of high-occurrence contaminants of emerging concern (CEC) was studied. The existing biological treatment in the WWTP was complemented with a continuous ultrafiltration (c-UF) pilot plant, as a tertiary treatment. Thus, the effect on CEC removal of both treatments could be analyzed globally and after each operation. A total of 39 CEC were monitored, including pharmaceutical products, industrial additives, food additives, herbicides and personal care products. For evaluation of the efficiencies, the removal rates of the biological and of the c-UF treatments, including their variability over a day and a week in relation to the ammonium content, were examined in the influent of the WWTP. In the biological treatment, a wide range of different removal rates was obtained due to the different CEC’s biodegradability and concentration. In UF, lower, but more constant removal rates, were achieved. In addition, the reduction of the general toxicity by the UF treatment in terms of the Microtox® toxicity assay was also evaluated. After UF, all of the samples yielded values of TU50 lower than 1, confirming this result the UF effectiveness for toxicity removal.
Cristian Ferreiro; Iker Gómez-Motos; José Ignacio Lombraña; Ana De Luis; Natalia Villota; Oihana Ros; Nestor Etxebarria. Contaminants of Emerging Concern Removal in an Effluent of Wastewater Treatment Plant under Biological and Continuous Mode Ultrafiltration Treatment. Sustainability 2020, 12, 725 .
AMA StyleCristian Ferreiro, Iker Gómez-Motos, José Ignacio Lombraña, Ana De Luis, Natalia Villota, Oihana Ros, Nestor Etxebarria. Contaminants of Emerging Concern Removal in an Effluent of Wastewater Treatment Plant under Biological and Continuous Mode Ultrafiltration Treatment. Sustainability. 2020; 12 (2):725.
Chicago/Turabian StyleCristian Ferreiro; Iker Gómez-Motos; José Ignacio Lombraña; Ana De Luis; Natalia Villota; Oihana Ros; Nestor Etxebarria. 2020. "Contaminants of Emerging Concern Removal in an Effluent of Wastewater Treatment Plant under Biological and Continuous Mode Ultrafiltration Treatment." Sustainability 12, no. 2: 725.
Ozonation is an efficient process for the primary degradation of most substrates but not for their mineralisation. In this work, the ozonation enhanced with the addition of H2O2 was studied for two substrates with very different oxidation resistances: the dye rhodamine 6G (R6G) and the surfactant linear alkylbenzene sulfonate (LAS). With O3 only, the primary degradation of R6G was completed in less than 10 min but its TOC removal only reached 45% in 1 h. By adding H2O2, TOC removal was increased to 70% with a molar ratio (mol H2O2/mol substrate) of 10. The analysis of pH decrease served to define the specific basicity loss (SBL). The optimum conditions for the R6G mineralisation were found to be associated with a SBL value between 1 and 10 ((min/g)/L)−1, through an adequate addition of H2O2. Moreover, in the case of LAS, the addition of H2O2 for a greater efficiency should occur after the foaming period, above all formed at acid pH. LAS degradation was also considerably improved, and the optimum for primary degradation achieved in 10 min with a TOC removal of over 65% with a molar ratio (mol H2O2/mol substrate) of 20.
Ana De Luis; José Ignacio Lombraña. pH-Based Strategies for an Efficient Addition of H2O2 During Ozonation to Improve the Mineralisation of Two Contaminants with Different Degradation Resistances. Water, Air, & Soil Pollution 2018, 229, 372 .
AMA StyleAna De Luis, José Ignacio Lombraña. pH-Based Strategies for an Efficient Addition of H2O2 During Ozonation to Improve the Mineralisation of Two Contaminants with Different Degradation Resistances. Water, Air, & Soil Pollution. 2018; 229 (11):372.
Chicago/Turabian StyleAna De Luis; José Ignacio Lombraña. 2018. "pH-Based Strategies for an Efficient Addition of H2O2 During Ozonation to Improve the Mineralisation of Two Contaminants with Different Degradation Resistances." Water, Air, & Soil Pollution 229, no. 11: 372.
BACKGROUNDThe advanced oxidation includes a high range of technologies, all of them appropriate to achieve environmental remediation. One of them is the organic compounds degradation by ozonation. The ozonation of rhodamine 6G (R6G) was investigated to study the effect of pH and subsequent predominance of the control stage, whether mass transfer from gas to liquid phase or chemical reaction, during oxidation. Several pH conditions are studied to achieve a greater efficiency of the process.RESULTSA mathematical model enables the analysis of the controlling stage. It was satisfactorily verified, showing that, initially, the process is controlled by the G-L mass transfer stage but, as the R6G ozonation progresses, the process becomes controlled by the kinetic reaction. While 99% of the rhodamine dye is removed during the mass transfer control stage regardless of the pH value, the percentage of TOC removal is only increased during the kinetic reaction control stage.CONCLUSIONThe most favourable pH, given the mass transfer characteristics of this case, was found to be an intermediate values around 6.0 where a minimum value for coefficient for R6G mineralization zav of about 23 mol O3/mol R6G mineralized, and near its theoretical value, was obtained.
Cristina Rodríguez; José Ignacio Lombraña; Ana De Luis; Josu Sanz. Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G. Journal of Chemical Technology & Biotechnology 2016, 92, 674 -683.
AMA StyleCristina Rodríguez, José Ignacio Lombraña, Ana De Luis, Josu Sanz. Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G. Journal of Chemical Technology & Biotechnology. 2016; 92 (3):674-683.
Chicago/Turabian StyleCristina Rodríguez; José Ignacio Lombraña; Ana De Luis; Josu Sanz. 2016. "Oxidizing efficiency analysis of an ozonation process to degrade the dye rhodamine 6G." Journal of Chemical Technology & Biotechnology 92, no. 3: 674-683.
Advanced oxidation processes (AOP) are able to degrade pollutants into harmless substances. To demonstrate the successful application of AOP to real, polluted effluents, ozonation has been applied for the removal of linear alkylbenzene sulfonates (LAS), a surfactant mixture commonly used in detergent formulation. LAS can be identified in a wide range of concentrations, i.e., in domestic wastewater or in the raw effluent of detergent-processing plants. The strongly tensoactive nature of LAS results in a foaming effect that eventually discourages AOP application, especially in the case of ozonation. The primary goal of this research is to analyze the LAS ozonation kinetics, considering the simultaneous effect of foam formation, by the development of a semiempirical model that is mainly based on the foaming phenomenon. Along with foaming, the proposed model also considers LAS removal by ozonation and the inverse phenomenon of LAS formation by redissolution of LAS. To the best of our knowledge, such a finding has not been previously reported. The proposed foaming model has been developed within various pH and LAS concentration values, primarily examining the initial pH value of the effluent due to its significant effect on foaming. The developed model adequately predicts the LAS concentration profiles measured in the liquid during ozonation. Moreover, this approach makes it possible to quantify the incidence of foaming and LAS redissolution during ozonation comparatively, leading to being able to propose the most desirable operating conditions for LAS removal.
Cristina Rodríguez; Ana De Luis; Jose Ignacio Lombraña; Josu Sanz. Kinetic Analysis of the Ozonation Process of the Surfactant LAS Considering the Simultaneous Foaming Effect. Journal of Surfactants and Detergents 2014, 17, 1229 -1239.
AMA StyleCristina Rodríguez, Ana De Luis, Jose Ignacio Lombraña, Josu Sanz. Kinetic Analysis of the Ozonation Process of the Surfactant LAS Considering the Simultaneous Foaming Effect. Journal of Surfactants and Detergents. 2014; 17 (6):1229-1239.
Chicago/Turabian StyleCristina Rodríguez; Ana De Luis; Jose Ignacio Lombraña; Josu Sanz. 2014. "Kinetic Analysis of the Ozonation Process of the Surfactant LAS Considering the Simultaneous Foaming Effect." Journal of Surfactants and Detergents 17, no. 6: 1229-1239.
This study demonstrates the importance of reaction temperature on the UV/H2O2 process. Oxidation reactions have been carried out on 1 g L−1 solutions of linear alkylbenzene sulphonates (LASs) in the range from ambient to 80 °C. Use of these conditions could be justified as they often represent the thermal conditions in which some polluted effluents are discharged. At an intermediate temperature of 60 °C and using small amounts of hydrogen peroxide LAS removal is significantly improved due to a more efficient use of the oxidant. This is mainly due to the enhancement of the radical reaction rate constant, as it does the quantum yield of the LAS. The use of more severe operating conditions, temperatures of 80 °C and high amounts of peroxide is necessary if the aim is to improve biodegradability. Only in that case intensified oxidation makes possible the removal of aromatic intermediates.
Josu Sanz; José Ignacio Lombraña; Ana de Luis. Temperature-assisted UV/H2O2 oxidation of concentrated linear alkylbenzene sulphonate (LAS) solutions. Chemical Engineering Journal 2012, 215-216, 533 -541.
AMA StyleJosu Sanz, José Ignacio Lombraña, Ana de Luis. Temperature-assisted UV/H2O2 oxidation of concentrated linear alkylbenzene sulphonate (LAS) solutions. Chemical Engineering Journal. 2012; 215-216 ():533-541.
Chicago/Turabian StyleJosu Sanz; José Ignacio Lombraña; Ana de Luis. 2012. "Temperature-assisted UV/H2O2 oxidation of concentrated linear alkylbenzene sulphonate (LAS) solutions." Chemical Engineering Journal 215-216, no. : 533-541.
The combination of H2O2 with UV radiation was applied to study the degradation of Rhodamine 6G dye (Rh-6G). The lumped kinetic model proposed in this work is a reaction-system scheme to describe the degradation of dye using lumps of intermediate compounds grouped by their chemical and colorimetric behavior. Rate constants obtained by application of the model were shown to predict the progress of dye oxidation. The effects of pH and oxidant dosage on these rate constants were also analyzed. Finally, photodecoloration was studied considering the absorption at 528 nm (the maximum absorption wavelength of the dye) as the sum of all compounds absorbing at this wavelength: Rhodamine itself and the colored intermediates produced.
Amaia Menendez; Jose Ignacio Lombraña; Ana De Luis. Lumped-intermediates analysis in the photooxidation of Rhodamine 6G in the H2O2/UV system. Korean Journal of Chemical Engineering 2011, 28, 388 -395.
AMA StyleAmaia Menendez, Jose Ignacio Lombraña, Ana De Luis. Lumped-intermediates analysis in the photooxidation of Rhodamine 6G in the H2O2/UV system. Korean Journal of Chemical Engineering. 2011; 28 (2):388-395.
Chicago/Turabian StyleAmaia Menendez; Jose Ignacio Lombraña; Ana De Luis. 2011. "Lumped-intermediates analysis in the photooxidation of Rhodamine 6G in the H2O2/UV system." Korean Journal of Chemical Engineering 28, no. 2: 388-395.
The characterization of radical oxidation in the degradation of phenolic compounds with H2O2/UV has been studied. A kinetic model was developed to estimate the concentration of different radical species. Radical concentration defines a determined oxidative level whose changes are analyzed for different oxidizing conditions involving pH and hydrogen peroxide dosage. This study has been developed to extend a previous radical model, only for simple phenolic solutions, to phenolic mixtures consisting of phenol and different cresols. In a mixture, the effects of composition and total amount of phenolics have a great influence on the degradation of each compound markedly modifying the behavior found in a simple solution. The application of a new extended radicalary model requires the characterization of the phenolic mixture solution through two fundamental parameters. The first one is the equivalent phenol in the mixture or phenol concentration, which gives the same oxidative level as that of the mixture case. Besides, additional information must be considered to characterize the deviation of the radical level between each compound and the mixture through the corresponding coefficient of radicalary activity. The model has been applied and verified to estimate the degradation of the different phenolics of a mixture, whatever the composition of phenolics, with good fitting to the experimental data. © 2010 American Institute of Chemical Engineers Environ Prog, 2011
Ana De Luis; José Ignacio Lombraña; Amaia Menéndez. Modeling of the radicalary state in the H2O2/UV oxidation system to predict the degradation kinetics of phenolic mixture solutions. Environmental Progress & Sustainable Energy 2010, 30, 196 -207.
AMA StyleAna De Luis, José Ignacio Lombraña, Amaia Menéndez. Modeling of the radicalary state in the H2O2/UV oxidation system to predict the degradation kinetics of phenolic mixture solutions. Environmental Progress & Sustainable Energy. 2010; 30 (2):196-207.
Chicago/Turabian StyleAna De Luis; José Ignacio Lombraña; Amaia Menéndez. 2010. "Modeling of the radicalary state in the H2O2/UV oxidation system to predict the degradation kinetics of phenolic mixture solutions." Environmental Progress & Sustainable Energy 30, no. 2: 196-207.
Synthetic solutions of phenol, o-, m- and p-cresol were oxidised by using Fenton’s reagent. The application of substoichiometric dosage of H2O2 led to the formation of intermediate compounds, continuing later the oxidation to complete oxidation. An important objective was to analyze the effect of hydrogen peroxide dosage applied and the reaction pH together with the iron oxidation state on the degradation level. A kinetic model was derived from a reaction mechanism postulated which was used to analyze the results of the experiments. Another aim was to analyze the hydrogen peroxide consumption. Noteworthy results include an increase in oxidant consumption to intensify phenol removal. Furthermore, oxidant consumption was analyzed through the ratio H2O2 to phenol removed and the average specific rate of removal (ASRR). By analyzing these two parameters it has been possible to ascertain the most favorable strategy for an efficient application of H2O2.
Ana De Luis; Jose Ignacio Lombraña; Fernando Varona; Amaia Menéndez. Kinetic study and hydrogen peroxide consumption of phenolic compounds oxidation by Fenton’s reagent. Korean Journal of Chemical Engineering 2009, 26, 48 -56.
AMA StyleAna De Luis, Jose Ignacio Lombraña, Fernando Varona, Amaia Menéndez. Kinetic study and hydrogen peroxide consumption of phenolic compounds oxidation by Fenton’s reagent. Korean Journal of Chemical Engineering. 2009; 26 (1):48-56.
Chicago/Turabian StyleAna De Luis; Jose Ignacio Lombraña; Fernando Varona; Amaia Menéndez. 2009. "Kinetic study and hydrogen peroxide consumption of phenolic compounds oxidation by Fenton’s reagent." Korean Journal of Chemical Engineering 26, no. 1: 48-56.
The characterization of radical oxidation was studied in phenolic compounds degradation by a H
A. De Luis; J. I. Lombraña; A. Menéndez. Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV. Journal of Advanced Oxidation Technologies 2008, 11, 1 .
AMA StyleA. De Luis, J. I. Lombraña, A. Menéndez. Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV. Journal of Advanced Oxidation Technologies. 2008; 11 (1):1.
Chicago/Turabian StyleA. De Luis; J. I. Lombraña; A. Menéndez. 2008. "Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV." Journal of Advanced Oxidation Technologies 11, no. 1: 1.
Synthetic dyes are extensively used in textile dyeing, paper printing, colour photography, pharmaceuticals, food, cosmetics and other industries. In spite of their diversity there are a certain number of properties common to many dye compounds, such as aromatic constitution, chromophore groups and others. Similarly to other dyes and due to the formation of colour intermediates, in the case of Rhodamine 6G colour capacity is maintained in the initial steps of dye degradation. For this reason in the degradation of a dye it is necessary to distinguish between two processes that take place simultaneously: dye removal and decolourization. This study was conducted by using a water solution of 50 mg/L of Rhodamine 6G (Rh-6G), as a model of a dye wastewater, in the hydrogen peroxide/UV system. The kinetic model proposed in this paper for the removing of Rh- 6G is a sequential first-order reaction. This model describes acceptably the changes in two kinds of compound for a wide interval of H
Amaia Menendez; Jose Ignacio Lombraña; Ana De Luis. Analysis of Primary Degradation and Decolourization of Dyes in Water by an H2O2/UV Advanced Oxidation Process. Journal of Advanced Oxidation Technologies 2008, 11, 1 .
AMA StyleAmaia Menendez, Jose Ignacio Lombraña, Ana De Luis. Analysis of Primary Degradation and Decolourization of Dyes in Water by an H2O2/UV Advanced Oxidation Process. Journal of Advanced Oxidation Technologies. 2008; 11 (3):1.
Chicago/Turabian StyleAmaia Menendez; Jose Ignacio Lombraña; Ana De Luis. 2008. "Analysis of Primary Degradation and Decolourization of Dyes in Water by an H2O2/UV Advanced Oxidation Process." Journal of Advanced Oxidation Technologies 11, no. 3: 1.
Synthetic surfactants are amphipathic molecules consisting of a hydrophilic polar head moiety and a hydrophobic non-polar tail one. Alkyl benzene sulfonates are the principal type of laundry anionic surfactants, they are extensively used because of its relatively low cost, good performance, and easy-processing to a stable powder with biodegradable characteristics at low concentrations. LAS are a mixture of homologues and phenyl positional isomers, each containing an aromatic ring sulfonated at position para and attached to a C
A. Menéndez; J. I. Lombraña; A. De Luis. An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants. Journal of Advanced Oxidation Technologies 2008, 11, 1 .
AMA StyleA. Menéndez, J. I. Lombraña, A. De Luis. An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants. Journal of Advanced Oxidation Technologies. 2008; 11 (1):1.
Chicago/Turabian StyleA. Menéndez; J. I. Lombraña; A. De Luis. 2008. "An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants." Journal of Advanced Oxidation Technologies 11, no. 1: 1.
This paper describes a laboratory study conducted to elucidate the possibility of treating high loaded solutions of surfactants through an Advanced Oxidation Process. Synthetic solutions of linear alkylbenzene sulfonates are treated in this work as this is a model compound commonly used in the formulation of detergents, with a great presence in urban and industrial waste‐waters. The application of UV combined with hydrogen peroxide to oxidise a surfactant effluent is shown to be suitable as a primary oxidation step since conversions of around 50% of the original compound are achieved in the most favourable cases. Initially, the influence of the operating variables on the degradation levels is analysed in this work. A kinetic model that takes into account both the contributions of direct photolysis and radical attack is also worked out. Direct photolysis is performed to determine the quantum yield in the single photodecomposition reaction. Additionally, the rate constant of the reaction between hydroxyl radicals and LAS in the oxidising system H2O2/UV is determined for different operational conditions. Finally, the contribution of each oxidation pathway is quantified; a higher contribution of the radical reaction than that of the direct photolysis was found in all cases.
J. Sanz; J. I. Lombraña; A. Ma De Luis; F. Varona. UV/H2O2chemical oxidation for high loaded effluents: A degradation kinetic study oflassurfactant wastewaters. Environmental Technology 2003, 24, 903 -911.
AMA StyleJ. Sanz, J. I. Lombraña, A. Ma De Luis, F. Varona. UV/H2O2chemical oxidation for high loaded effluents: A degradation kinetic study oflassurfactant wastewaters. Environmental Technology. 2003; 24 (7):903-911.
Chicago/Turabian StyleJ. Sanz; J. I. Lombraña; A. Ma De Luis; F. Varona. 2003. "UV/H2O2chemical oxidation for high loaded effluents: A degradation kinetic study oflassurfactant wastewaters." Environmental Technology 24, no. 7: 903-911.
We compared two H2O2 oxidation methods for the treatment of industrial wastewater: oxidation using Fenton's reagent [H2O2/Fe(II)] and microwave irradiation. Both methods were applied to the treatment of synthetic phenol solutions (100 mg L−1) and of an industrial effluent containing a mixture of ionic and non-ionic surfactants at high load (20 g L−1 of COD). The effects of initial pH, initial H2O2 concentration, Fenton catalyst amount and irradiation time were assessed. According to the oxidation of phenol, it has been found that the oxidation by Fenton's reagent is dependent on the pH, contrary to the microwave system, which is not influenced by this parameter. For both systems, a limiting amount of oxidant has been found; above this point the oxidation of phenol is not improved by a further addition of peroxide. The oxidation of the industrial surfactant effluent has only been successful with the Fenton's reagent. In this case, large amounts of ferrous ions are necessary for the precipitation of the ionic surfactants of the effluent, followed by the oxidation of the non-ionic constituents of the solution.
J. Sanz; A. M. De Luis; M. Ortueta; F. Varona; Jose Ignacio Lombraña. Microwave and Fenton's reagent oxidation of wastewater. Environmental Chemistry Letters 2003, 1, 45 -50.
AMA StyleJ. Sanz, A. M. De Luis, M. Ortueta, F. Varona, Jose Ignacio Lombraña. Microwave and Fenton's reagent oxidation of wastewater. Environmental Chemistry Letters. 2003; 1 (1):45-50.
Chicago/Turabian StyleJ. Sanz; A. M. De Luis; M. Ortueta; F. Varona; Jose Ignacio Lombraña. 2003. "Microwave and Fenton's reagent oxidation of wastewater." Environmental Chemistry Letters 1, no. 1: 45-50.