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oxidation processes » operational processes (Expander búsqueda), production processes (Expander búsqueda)
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1
artículo
Publicado 2010
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Advanced Oxidation Processes (AOX) are based on the in situ generation of hydroxyradicals (·OH), which have a high oxidation potential. In the case of Fenton processes !he generation of hydroxy radicals takes place by the combination of an oxidation agent (H202) with a catalyst (Fe(II)). These radicals are not selective and they react very fast with the organic matter,being able to oxidize a high variety of organic compounds. This property allows the degradation of pollutants into more biodegradable compounds, and,in some cases, their complete mineralization into C02 and mineral acids. Under optimal conditions, (pH=3, (Fe 2+] = 200 mg/L, [H2O2] = 3612 mg/L) the Fenton processes are able to reduce !he concentration of the organic matter present in the textile effiuent, up lo 97%.
2
artículo
Publicado 2010
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Advanced Oxidation Processes (AOX) are based on the in situ generation of hydroxyradicals (·OH), which have a high oxidation potential. In the case of Fenton processes !he generation of hydroxy radicals takes place by the combination of an oxidation agent (H202) with a catalyst (Fe(II)). These radicals are not selective and they react very fast with the organic matter,being able to oxidize a high variety of organic compounds. This property allows the degradation of pollutants into more biodegradable compounds, and,in some cases, their complete mineralization into C02 and mineral acids. Under optimal conditions, (pH=3, (Fe 2+] = 200 mg/L, [H2O2] = 3612 mg/L) the Fenton processes are able to reduce !he concentration of the organic matter present in the textile effiuent, up lo 97%.
3
artículo
Publicado 2017
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Phenol can be degraded to almost 100 % within a few minutes via Fenton and photo-Fenton processes. Its degradation and the ratio of initial molar concentrations of oxidant and catalyst increase in inverse senses, and a ratio of 38.4 was optimal for aqueous solutions contaminated with 20 ppm of phenol. In addition to this, the use of ultraviolet-A light enhanced degradation when compared to shorter wavelengths.
4
artículo
Publicado 1998
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Thermodynamic simulation models have been developed to observe the behavior of the minor elements Zn, Pb, As, Sb and Bi; as well as the major elements Cu, Fe, Si, 0 and S in the conversion and fusion processes: NORANDA and ISASMELT for the production of copper-rich mattes. The Noranda process shows a steady state model for obtaining a high-grade matte in metallic copper. The lsasmelt process is based on the concept of the two independent reaction sites in the bath (slag-killing interface): rapid oxidation and slow reduction. The heat balance of the process and the distribution thermodynamics of the minor elements are united and expressed in terms of the process variables such as temperature, enriched 02, composition of the charge, degree of matte and content of the magnetite in the Slag and other variables are incorporated into the modeling, which can predict the operating effects of che...
5
artículo
Publicado 1998
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Thermodynamic simulation models have been developed to observe the behavior of the minor elements Zn, Pb, As, Sb and Bi; as well as the major elements Cu, Fe, Si, 0 and S in the conversion and fusion processes: NORANDA and ISASMELT for the production of copper-rich mattes. The Noranda process shows a steady state model for obtaining a high-grade matte in metallic copper. The lsasmelt process is based on the concept of the two independent reaction sites in the bath (slag-killing interface): rapid oxidation and slow reduction. The heat balance of the process and the distribution thermodynamics of the minor elements are united and expressed in terms of the process variables such as temperature, enriched 02, composition of the charge, degree of matte and content of the magnetite in the Slag and other variables are incorporated into the modeling, which can predict the operating effects of che...
6
artículo
Publicado 2021
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The intensive use of agrochemicals for food production in developing countries has generated a problem of environmental concern since many of these substances, which are usually difficult to biodegrade, can reach natural sources, generating their contamination. That is why the search for new technologies for the elimination of these pollutants has arisen with great interest. Advanced oxidation processes (AOP), whose main characteristic is the generation of highly oxidizing species such as the hydroxyl radical, can achieve the chemical modification of the pollutant, generating by-products that can be less harmful to the environment. In this work, the degradation of methomyl, a highly used insecticide in the Arequipa region, Peru, was evaluated using different PAOs such as ozonation in alkaline medium, UV-C/H2O2 and photo-Fenton processes at acid pH in natural surface waters. The effect of...
7
artículo
Publicado 2017
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A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration.
8
artículo
Publicado 2017
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A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration.
9
artículo
Publicado 2020
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The various industrial sectors, as well as livestock and agricultural activities, are increasing the production of inputs to meet the demand of the worldwide demographic explosion, making a challenge the clean maintenance of water, soil, and air. Therefore, the search for solutions for a pollutant-free environment without compromising economic development has become extremely important. Thereby, biotechnological studies in order to solve environmental issues have been gaining extensive attention through the coupling of technology procedures to biological systems as sustainable solutions to remediate contaminated areas. In this sense, this review covers topics such as the role of Omics era in microbial environmental biotechnology for pollution control as well as the microbial fuel cell use in energy production. Moreover, phytoremediation and the perspective of applying chemical methods ar...
10
artículo
Publicado 2020
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The various industrial sectors, as well as livestock and agricultural activities, are increasing the production of inputs to meet the demand of the worldwide demographic explosion, making a challenge the clean maintenance of water, soil, and air. Therefore, the search for solutions for a pollutant-free environment without compromising economic development has become extremely important. Thereby, biotechnological studies in order to solve environmental issues have been gaining extensive attention through the coupling of technology procedures to biological systems as sustainable solutions to remediate contaminated areas. In this sense, this review covers topics such as the role of Omics era in microbial environmental biotechnology for pollution control as well as the microbial fuel cell use in energy production. Moreover, phytoremediation and the perspective of applying chemical methods ar...
11
artículo
Publicado 2023
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The environmental impact generated by the extensive utilization of fossil-based fuels has driven the need to develop renewable energy sources, as well as sustainable processes for liquid fuels production. Oxymethylene ethers (OMEs) are oxygenated compounds that have emerged as a potential alternative to replace Diesel fuel, helping to reduce the formation of soot and nitrogen oxides (NOx) during its combustion. Among this family of compounds, 1,1-dimethoxymethane (OME1) has special interest because of its versatility as an industrial solvent or as a chemical intermediate. Specifically, it can be used as a feedstock to produce higher chain OMEs. The direct synthesis of OME1 involves the selective oxidation of methanol over bifunctional catalysts, which have been widely studied during the last decades. This work summarizes the main features of the different catalytic systems developed, whi...
12
artículo
Publicado 2023
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The environmental impact generated by the extensive utilization of fossil-based fuels has driven the need to develop renewable energy sources, as well as sustainable processes for liquid fuels production. Oxymethylene ethers (OMEs) are oxygenated compounds that have emerged as a potential alternative to replace Diesel fuel, helping to reduce the formation of soot and nitrogen oxides (NOx) during its combustion. Among this family of compounds, 1,1-dimethoxymethane (OME1) has special interest because of its versatility as an industrial solvent or as a chemical intermediate. Specifically, it can be used as a feedstock to produce higher chain OMEs. The direct synthesis of OME1 involves the selective oxidation of methanol over bifunctional catalysts, which have been widely studied during the last decades. This work summarizes the main features of the different catalytic systems developed, whi...
13
artículo
Publicado 2024
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In the oxidation ponds, there is an alarming accumulation of sedimentable organic matter, despite the absence of direct tributaries. Although the presence of potentially contaminating elements is suspected, their origin and repercussions still require clarifi cation. It is necessary to determine the organic matter to assess the value of sedimentat ion in this context. Th e study aimed to evaluate the concentration of sedimentable organic matter without effl uent discharge in the Parcona Lagoon, Ica-Peru. Th e Walkley-Black method was used to determine the organic matter in the sediments. After preparing the sample with specifi c reagents, absorbance at 590 nm was measured using a DR-5000 UV-vis spectrophotometer, with reference standards for calibration. A concentration was found at the fi ve sampling points of 3.87; 4.13; 2.96; 3.44; and 2.21 mg/kg, respectively. Th e concentration of o...
14
artículo
Publicado 2023
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En este trabajo de investigación se aplicó el método electro-oxidación para la decoloración de los efluentes reales y simulados provenientes de los procesos de teñido del algodón con colorantes reactivos, este método fue aplicado utilizando electrodos tipo malla, el cátodo de titanio y el ánodo de titanio recubierto con rutenio e iridio. Se utilizaron dos tipos de reactores, de un compartimiento y compartimiento doble separado con membrana de intercambio, con el fin de comparar el desempeño electroquímico en la decoloración de efluentes textiles que contienen colorantes reactivos (Corafix Blue Mers 150%, Corafix Golden Yellow Mer 150% y Corafix Red Me-4B 150%).Durante los ensayos de decoloración, se realizó el seguimiento del contenido de colorante y cloro mediante espectrofotometría UV-visible. En las pruebas de laboratorio se trató el efluente simulado a la concentraci...
15
tesis de grado
Publicado 2020
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The alternative to protect yourself from UV rays and prevent serious injuries and even skin cancer is in sunblock, also called physical screens. This product, due to its characteristics, has high resistance and durability over time, unlike sunscreen, which is commonly used and does not offer the effectiveness of the first but is used due to its low cost and due to the lack of information that exists in this regard. Considering the need to have an effective product for the prevention and care of the skin, our objective is to determine the feasibility and viability of the operation process and launch to the market of a 100% Peruvian brand sunblock that contains oxide zinc and titanium dioxide. This research includes a pre-operational year (2020) and five operational years (2021 to 2025). It takes place in Lima department and the plant’s location is in the Lince district. Likewise, the va...
16
artículo
WIMCIT: An in-house development integrated code for neutron analysis in MTR reactors with mixed core
Publicado 2003
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So far, Peruvian nuclear research reactors RP-10 and RP-0 have been operating only with uranium oxide fuel elements (U3O8+Al). In the future RP-10 reactor will operate with mixed cores (U3Si2+Al, U3O8+Al). For this reason the calculus capacity has to be increased in order to be able to handle the new fuel management. Since preparation of nuclear libraries for diffusion calculation requires a significant amount of computational and human resources a new tool that processes libraries generation and diffusion calculations is necessary.
17
tesis de grado
Publicado 2022
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Los óxidos bimetálicos han atraído una atención significativa como materiales de electrodos para supercapacitores debido a sus procesos redox altamente reversibles, que comúnmente se asocian con su química superficial y características morfológicas. En este trabajo, se sintetizaron óxidos bimetálicos con diferentes composiciones molares de Co y V, denominados Co0,54V0,46; Co0,6V0,4; Co0,65V0,35 y Co0,7V0,3, mediante el método solvotérmico modificado utilizando glicerol como agente estabilizante. Las caracterizaciones electroquímicas se midieron en una celda de tres electrodos. Se estudió la influencia de la composición de los óxidos de CoV sobre las propiedades pseudocapacitivas mediante el análisis del mecanismo de almacenamiento de energía siguiendo la ley de potencias y la metodología de Dunn, para obtener los valores de b. Se observó que los óxidos de CoV sinteti...
18
tesis de grado
Publicado 2024
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Efluentes de curtiembres presentan carga orgánica proveniente del proceso en general de curtido, sin embargo, una de las cargas más contaminantes está representada por los colorantes utilizados durante el proceso de teñido del cuero. Esto debido a que los colorantes ampliamente usados en la industria contienen en su molécula principalmente el grupo orgánico azo(-N=N-). Estos compuestos presentan un riesgo para el medio ambiente tal como eutrofización y para la salud pública debido a efectos potencialmente cancerígenos. Ante tales riesgos citados, los procesos oxidativos avanzados surgen como una solución económicamente viable y eficaz para remover estos colorantes, debido a la generación de radicales hidroxilos (OH•) capaces de quebrar las moléculas potencialmente contaminantes presentes en los efluentes de la industria curtidora. Se trabajó con el proceso oxidativo avanz...
19
tesis doctoral
Publicado 2024
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The present study was carried out entirely at the LICC with cassava (Manihot esculenta C.), a piririca variety, as raw material, which to obtain the starch was processed in the pilot plant of the Faculty of Food Industries, obtaining a yield of 10%, and starch drying temperature of 40o C, then the oxidation processes were carried out, both with sodium hypochlorite and by acetylation, then it was dried at a temperature of 40°C, then it was sieved with a mesh of 100 mm, following the process the formulations were proposed: modified starch, alginate, glycerol, free copaiba oil and distilled water (0.054%, 0.0139%, 0.049%, 0.005% and 99.95% and alginate, 16 formulations followed with different percentages of inputs, when we had obtained the sheets, we proceeded to perform the mechanical tests elongation (0.2-5.4), tension test ( 0.20 -16.05), permeability of sheets (49.34-465.79) and diamet...
20
tesis de maestría
Publicado 2024
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El proyecto en estudio Minera JJL permite evaluar las diversas variables de evaluación para la factibilidad considerando variables relevantes correspondientes al negocio minero de una operación minera subterránea con contenidos metálicos de Cu, Au y Ag, la cual en un inicio fue explotada mediante método convencional por tener características mayormente auríferas (oxido). Sin embargo, dada la transición de la mineralización de oxido a sulfuro, permite optar por elegir un método de explotación con menores costos, alta productividad y mayor recuperación de mineral, con procesos mecanizados y tratamiento metalúrgico que permita mejores resultados en el valor de mineral Para ello utilizamos el método de Montecarlo para simular el algoritmo usando números pseudoaleatorios con apoyo del software Oracle Crystal Ball. Con el conseguimos realizar las pruebas necesarias y analizar lo...
