Centro Interamericano Of Recursos Del Agua

Mexico City, Mexico

Centro Interamericano Of Recursos Del Agua

Mexico City, Mexico

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Bernal-Martinez L.A.,Autonomous University of Mexico State | Barrera-Diaz C.,Autonomous University of Mexico State | Solis-Morelos C.,Centro Interamericano Of Recursos Del Agua | Natividad R.,Autonomous University of Mexico State
Chemical Engineering Journal | Year: 2010

The effectiveness of electrochemical, ozone and integrated electrochemical-ozone processes on industrial wastewater was evaluated. Electrochemical under optimal conditions of pH 7 and 40mAcm-2 of current density reduced the chemical oxygen demand (COD) by 43% and the biochemical oxygen demand (BOD5) by 42%. Ozone treatment reduced both COD and BOD5 by 60%. Integration of the two processes at pH 7 and 20mAcm-2 of current density greatly improved the reduction of COD (84%), BOD5 (79%), color (95%), turbidity (96%) and total coliforms (99%). Thus, the integrated electrochemical-ozone process noticeably improves wastewater quality. Finally, the sludge produced during integrated electrochemical-ozone process was quantified and the morphology was evaluated by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). © 2010 Elsevier B.V.


Lugo-Lugo V.,Autonomous University of Mexico State | Barrera-Diaz C.,Autonomous University of Mexico State | Roa-Morales G.,Autonomous University of Mexico State | Urena-Nunez F.,Instituto Nacional de Investigaciones Nucleares | Linares-Hernandez I.,Centro Interamericano Of Recursos Del Agua
ECS Transactions | Year: 2010

Electrochemical methods are a novel approach for Cr(VI) reduction due their high capability, ease and inexpensive use. It was found that Cr(VI) reduction can be done using iron (Fe2+): electro-generated and galvanic production. The behavior of copper was examined as cathode material for optimized continuous reactors, determining copper-iron ratio surface areas (3.5:1) in batch studies of corrosion tests. Results of Cr(VI) reduction capacity showed that copper-iron galvanic systems offers advantages over traditional and even iron electrogenerative copper-iron systems and moreover include no energy or chemical input into the system and no sludge generation. On the other hand electro-generative reactor showed a strong correlation between current density and Cr(VI) reduction capacity. ©The Electrochemical Society.


Jimenez-Cedillo M.J.,Instituto Nacional de Investigaciones Nucleares | Jimenez-Cedillo M.J.,National Autonomous University of Mexico | Olguin M.T.,Instituto Nacional de Investigaciones Nucleares | Fall C.,Centro Interamericano Of Recursos Del Agua | Colin-Cruz A.,National Autonomous University of Mexico
Journal of Environmental Management | Year: 2013

The sorption of As(III) and As(V) from aqueous solutions onto iron-modified Petroselinum crispum (PCFe) and iron-modified carbonaceous material from the pyrolysis of P. crispum (PCTTFe) was investigated. The modified sorbents were characterized with scanning electron microscopy. The sorbent elemental composition was determined with energy-dispersive X-ray spectroscopy (EDS). The principal functional groups from the sorbents were determined with FT-IR. The specific surfaces and points of zero charge (pzc) of the materials were also determined. As(III) and As(V) sorption onto the modified sorbents were performed in a batch system. After the sorption process, the As content in the liquid and solid phases was determined with atomic absorption and neutron activation analyses, respectively. After the arsenic sorption processes, the desorption of Fe from PCFe and PCTTFe was verified with atomic absorption spectrometry. The morphology of PC changed after iron modification. The specific area and pzc differed significantly between the iron-modified non-pyrolyzed and pyrolyzed P. crispum. The kinetics of the arsenite and arsenate sorption processes were described with a pseudo-second-order model. The Langmuir-Freundlich model provided the isotherms with the best fit. Less than 0.02% of the Fe was desorbed from the PCFe and PCTTFe after the As(III) and As(V) sorption processes. © 2013 Elsevier Ltd.


Albarran K.V.P.,National Autonomous University of Mexico | Gonzalez F.C.V.,Research Center y Estudios Turisticos | Contreras A.T.R.,Centro Interamericano Of Recursos Del Agua | Villareal L.Z.,Research Center y Estudios Turisticos | Vela H.A.G.,Federal University of Santa Maria
Revista de Estudios Regionales | Year: 2015

This document is an analysis of economic and sociocultural development of Ijuí, community of Rio Grande do Sul (RS), Brazil under doctrine of Geography Cultural. Ijuíis localized in de basin of same name northwest of RS. In the XVI century arrived the Jesuits missioners who organized the natives in small villages that got be important economical centers of mate herb and cattle settled this area firstly. In 1759 the Portugal Minister declared a law ejected the Jesuits of his territories and the land remained free of settlers. Then with the independence, Brazil opened the commercial success with sugar cane plantations, coffee and the gold ore extraction. The slave covered the labor required for these activities, after slave abolition the Brazilian Government invited and made laws in favor of immigrants to come to Brazil to work in a salaried system that was influenced by the European capitalism in expansion. To maintain sugar cane and coffee plantations as the gold ore extraction, were created agricultural and cattle poles in environmentally strategic areas, in this way IRB was settled by Germans ethnics. The Ijuícolonization began with the official founding of the Colony Ijuí on October 19, 1890, where installed a hundred families and by Decree no 1814, on January 31, 1912, was established as an autonomous municipality. The colonization settled Russians and Polands with German roots, in 1981 arrived Italians and Swedishs; with the First World War arrived Germans, Lithuanians, Austrians, in 1895 Arabians. The socioeconomic function was determined by their knowledge of land use and their lifestyles, identified by habits (dances, rites, foods, clothes, linguistic dialects, religion, etc). The region was developed through settler's work that drove it as a commercial and industrial empire, the experience of immigrants in industry work and organization favored the rapid economic development of the region. The settlers knew little or nothing riograndense climate, but created economies based in local crops such as yerba mate, the use of land for farming of cereals and vegetables, livestock, mainly pigs exploitation of natural resources such as power generators, and the river to produce electricity and give rise to other industries. Environmental, economic and social development in the IRB depended on capitalist development model adopted by Brazil to ensure an economically prosperous society. The natural areas became cities in intensive fields, grazing areas and industrial complexes, and consumption is not encouraged conservation. The economy prospered thanks to environmental management as an energy source to operate it and the production of goods for consumption and trade. Emerged a new cultural identity following the convergence of different ethnicities in the same space, the most deeply rooted traditions of that combination persist to this day, others were created over time to strengthen the sense of belonging in the region. Now at days Ijuí are exploited for agriculture, are reminiscent of the natural flora in the bank and there is a highly developed industrial complexes in urban areas. By the high cultural level the region is known as the "land of diverse cultures" by the prevailing number of ethnicities and express their cultural traits. Ijuí represents migration policy of colonial Brazil, in a small land gaúcha converge a variety of races and nationalities that reflect a new Brazilian identity. Despite the ethnic, groups stay in touch as part of territorial ownership and its economic and cultural development.


Gutierrez-Segura E.,Instituto Nacional de Investigaciones Nucleares | Gutierrez-Segura E.,National Autonomous University of Mexico | Solache-Rios M.,Instituto Nacional de Investigaciones Nucleares | Colin-Cruz A.,National Autonomous University of Mexico | Fall C.,Centro Interamericano Of Recursos Del Agua
Journal of Environmental Management | Year: 2012

In the present study the process of adsorption of cadmium from aqueous solutions using Na-zeolitic tuff, Fe-zeolitic tuff and carbonaceous material from pyrolyzed sewage sludge treated with HCl was investigated. The cadmium removal efficiency was studied as a function of contact time, adsorbate concentration, pH and adsorbent dose. The results showed that removal of cadmium was best described by the Langmuir-Freundlich isotherm. The kinetic experimental results were best described by the pseudo-first order model. The results indicate that the adsorption mechanism is physical and chemical sorption on heterogeneous materials. The maximum retention of cadmium was at pH around 6.0 for the materials. In kinetic studies, the Na and Fe modified zeolitic tuffs showed similar sorption capacities for cadmium and they were higher than the capacity found for carbonaceous material. © 2011 Elsevier Ltd.


Jimenez-Cedillo M.J.,Instituto Nacional de Investigaciones Nucleares | Jimenez-Cedillo M.J.,National Autonomous University of Mexico | Olguin M.T.,Instituto Nacional de Investigaciones Nucleares | Fall C.,Centro Interamericano Of Recursos Del Agua | Colin A.,National Autonomous University of Mexico
Applied Clay Science | Year: 2011

In this study, the sorption properties of iron- and iron-manganese-modified clinoptilolite-rich tuffs used to remove As(III) and As(V) from aqueous solutions were investigated. Factors taken into account included the initial concentration of the arsenic in the aqueous media, the concentration of Mn(II) in the Mn-As bicomponent solutions, and the pH and concentration of the iron and iron-manganese in the zeolitic materials. The modified zeolitic rocks were analyzed via scanning electron microscopy, and their elemental composition was determined via energy-dispersive X-ray spectroscopy EDS. The aggregates of the non-zeolitic material (iron and iron-manganese chemical species) were observed via transmission electron microscopy. X-ray diffraction patterns were also obtained to determine the components of the unmodified and iron and iron-manganese modified zeolites. All the analyses of As(III) and As(V) adsorption by the modified zeolites were carried out in a batch system. Arsenic and manganese were analyzed using an absorption atomic spectrophotometer, and a hydride generator was used for the arsenic analysis. The pH was measured before and after the contact of the arsenic solution with the zeolitic materials. Aggregates of iron or iron-manganese species on the surface of the iron and iron-manganese-modified zeolitic materials were observed. The arsenic adsorption processes were best described by the Langmuir-Freundlich model. In general, the results suggested that the removal of As(III) and As(V) by the zeolitic materials is influenced by the nature of the arsenic chemical species, the origin of the natural zeolite and the textural characteristics of the iron and iron-manganese clinoptilolite-rich tuff. The presence of manganese in the iron-manganese-modified crystalline zeolite network improved the adsorption capacity of the zeolitic material for As(III) and, to a lesser degree, for As(V). It was also found that the Mn(II) from the Mn-As bicomponent aqueous solutions and the pH affect the capacity of the unmodified and iron- or iron-manganese-modified natural zeolite to adsorb As(III) or As(V). © 2011 Elsevier B.V.


Gutierrez-Segura E.,National Autonomous University of Mexico | Solache-Rios M.,Instituto Nacional de Investigaciones Nucleares | Colin-Cruz A.,National Autonomous University of Mexico | Fall C.,Centro Interamericano Of Recursos Del Agua
Water, Air, and Soil Pollution | Year: 2014

Carbonaceous material obtained from industrial sewage sludge and Na-zeolitic tuff were used to adsorb cadmium from aqueous solutions in column systems. The Bohart, Thomas, Yoon-Nelson, and mass transfer models were successfully used to fit the adsorption data at different depths, and the constant rates were evaluated. The parameters such as breakthrough and saturation times, bed volumes, kinetic constants, adsorption capacities, and adsorbent usage rates (AUR) were determined. The results show that the breakthrough time increases proportionally with increasing bed height. The adsorption capacity for cadmium for Na-zeolitic tuff was higher than carbonaceous material. The results indicated that the Na-zeolitic tuff is a good adsorbent for cadmium removal. © Springer International Publishing 2014.


Gutierrez-Segura E.,Instituto Nacional de Investigaciones Nucleares | Gutierrez-Segura E.,National Autonomous University of Mexico | Solache-Rios M.,Instituto Nacional de Investigaciones Nucleares | Fall C.,Centro Interamericano Of Recursos Del Agua | Colin-Cruz A.,National Autonomous University of Mexico
Separation Science and Technology | Year: 2012

In the present study, the processes of adsorption of denim blue by Fe-zeolitic tuff from aqueous solutions at different pH values were determined. The parameters, K d(n), K d(i), Φ n, pK a were accurately predicted by applying the linear model to sorption isotherms at different pH values of denim blue. Maximum removal of denim blue was observed at pH values between 3 and 5, where neutral species are the main components of the solution. The results indicate that pH has a pronounced effect on denim blue sorption depending on the conditions of the system. © 2012 Copyright Taylor and Francis Group, LLC.

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