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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 2014
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In Peru only treat 29.1% of urban domestic wastewater is performed. This treatment is carried out at 143 industries, pouring the rest into rivers, lakes and the sea, so it is necessary to give more importance to the management of water resources. The textile industry, which uses large amounts of dye pigments not properly treat their effluents, being part of the problem. The Fenton process is an alternative for the treatment of effluents from the dyeing process, the most important pollutant azo compounds. The Fenton process provides the ability to reuse and / or recycle water with high efficiency (86%) in a few minutes.
5
artículo
Publicado 2002
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The work of leaching is developed in Fewer, Concentrated and Refractory Material (sulfured), in pulp or particles (agitation or piles) to ambient temperature in advance of maximum leaching of twelve hours, using like half lixiviante the acid sulfuric concentrate added salts oxidizers like the chlorides and nitrate of sodium or ammonium nitrate in different proportions. The results obtained regarding the recovery of gold reach 98%. If the gold is encapsulated in the quartz or auriferous sand, fluoride of sodium will be added (never to use the calcium, because it forms plaster that hinders the process) with the purpose of dissolving the quartz, it doesn’t dissolve neither complex form with the gold, it is also good to leave in you liberate noble metals as the titanium, platinum, talio, germanium, etc., those which then are recovered with the means lixiviante to which I have denominated S...
6
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...
7
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...
8
artículo
Publicado 2002
Enlace
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The work of leaching is developed in Fewer, Concentrated and Refractory Material (sulfured), in pulp or particles (agitation or piles) to ambient temperature in advance of maximum leaching of twelve hours, using like half lixiviante the acid sulfuric concentrate added salts oxidizers like the chlorides and nitrate of sodium or ammonium nitrate in different proportions. The results obtained regarding the recovery of gold reach 98%. If the gold is encapsulated in the quartz or auriferous sand, fluoride of sodium will be added (never to use the calcium, because it forms plaster that hinders the process) with the purpose of dissolving the quartz, it doesn’t dissolve neither complex form with the gold, it is also good to leave in you liberate noble metals as the titanium, platinum, talio, germanium, etc., those which then are recovered with the means lixiviante to which I have denominated S...
9
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...
10
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.
11
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.
12
artículo
Publicado 2008
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In this paper we evaluate the technical feasibility of advanced oxidation process (AOX) using the reagent Fenton H2O2/Fe^(2+) in the treatment of wastewater generated by the caustic washing of an oil refinery. These waters contain a chemical oxygen demand (DQO), 20 160 mg / L and total phenols 1 800 mg / L. The results show the treatment efficiency of removal of 90% for DQO, and 99% for total phenol at pH 4.
13
artículo
Publicado 2013
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The realization of the photo-electrochemical process consists in percolating the solution to be treated through an electrolytic reactor, in which the anodes coated with metal oxides remains under the effect of ultraviolet radiation (UV). The solution used in this study was contaminated artificially from fecal samples positive for bacteria and intestinal parasites. The evaluation of the process for the disinfection of water was held in photo-electrical-chemical reactor, with a total volume of 10.0 Lper batch system contaminated with human fecal material. It was used as the -1supporting electrolyte solution of sodium perchlorate at 0.1 mol. Land applying a current density -1of 14 mAwith the aid of a source and a flow rate of 250 L.h. The UVradiation was provided by a mercury vapor lamp of 55 Wwithout bulb shield. The center electrode is inserted through a quartz bulb. Samples were analyzed...
14
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...
15
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...
16
artículo
Publicado 2024
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VINASSE IS ACIDIC, DARK BROWN WASTEWATER OBTAINED AS A RESIDUE FROM THE ALCOHOL DISTILLATION PROCESS, THE MAIN COMPONENT OF WHICH IS WATER, IN ADDITION TO MINERAL NUTRIENTS AND A HIGH ORGANIC LOAD. ELECTROCOAGULATION (EC) IS A TECHNOLOGY THAT GENERATES COAGULATING SUBSTANCES IN SITU BY OXIDIZING SACRIFICIAL ANODES THROUGH AN ELECTRIC CURRENT APPLIED TO THE ELECTRODES. DURING THE LAST DECADE, THE ELECTROCOAGULATION PROCESS HAS BEEN INTENSIVELY INVESTIGATED IN SEVERAL REVIEWS, DUE TO ITS EASE OF OPERATION, VERSATILITY, SUSTAINABILITY AND LOW ENVIRONMENTAL IMPACT. THE OBJECTIVE OF THE PRESENT WORK HAS BEEN TO MAKE A GENERAL REVIEW OF THE EC PROCESS, ITS PRINCIPLE, REACTION MECHANISM AND OPERATING PARAMETERS INVOLVED IN THE ELECTROCOAGULATION PROCESS. IN THIS RESEARCH, THE PRISMA METHOD WAS USED FOR THE ANALYSIS OF ARTICLES FROM DIFFERENT DATABASES SUCH AS SCOPUS, SCIENCEDIRECT AND GOOGLE SC...
17
artículo
Publicado 2008
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En el presente trabajo, se evalúa la factibilidad técnica del proceso de oxidación avanzada (AOX) usando el reactivo Fenton H2O2/Fe^(2+) en el tratamiento de las aguas residuales generadas por el lavado cáustico de una refinería de petróleo. Estas aguas contienen una demanda química de oxígeno (DQO), de 20 160 mg/L y fenoles totales 1800 mg/L. Los resultados del tratamiento muestran eficiencia de remoción del 90% para DQO, y 99% para fenoles totales a pH de 4.
18
artículo
Publicado 2019
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The discharges that are disposed in the sewage systems without previous treatment often contribute to the contamination of receiving bodies, mainly rivers, seas and lagoons due to their high polluting load that they carry with them, wastewater from the laundries of health centers is one of the cases that should be taken into account due to the consequences they can generate due to the presence of important contaminants present derived from the use of bio-sanitizers, cytotoxics, human remains, etc. The research carried out aimed to reduce the pollutants and main physicochemical parameters of a sample of sewage effluents from the laundry of the National Institute of Health of the child of San Borja - Lima, by means of photocatalytic oxidation technology with titanium dioxide (TiO2) and Light ultraviolet (UV). The results obtained in an experimental design are related to the concentration o...
19
artículo
Publicado 2019
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The discharges that are disposed in the sewage systems without previous treatment often contribute to the contamination of receiving bodies, mainly rivers, seas and lagoons due to their high polluting load that they carry with them, wastewater from the laundries of health centers is one of the cases that should be taken into account due to the consequences they can generate due to the presence of important contaminants present derived from the use of bio-sanitizers, cytotoxics, human remains, etc. The research carried out aimed to reduce the pollutants and main physicochemical parameters of a sample of sewage effluents from the laundry of the National Institute of Health of the child of San Borja - Lima, by means of photocatalytic oxidation technology with titanium dioxide (TiO2) and Light ultraviolet (UV). The results obtained in an experimental design are related to the concentration o...
20
revisión
Publicado 2021
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This study was supported by the Consejo Nacional de Ciencia, Tecnolog?a e Innovaci?n Tecnol?gica (CONCYTEC) and the Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnol?gica (FONDECYT) - Peru. Grant N? 06-2019-FONDECYT-BM-INC.INV.
