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Ingeniare. Revista chilena de ingeniería

versión On-line ISSN 0718-3305

Ingeniare. Rev. chil. ing. v.17 n.2 Arica ago. 2009

http://dx.doi.org/10.4067/S0718-33052009000200016 

Ingeniare. Revista chilena de ingeniería, vol. 17 Nº 2, 2009, pp. 275-281

 

CHARACTERIZATION OF DEPOSITS FORMED IN A WATER DISTRIBUTION SYSTEM

CARACTERIZACIÓN DE DEPÓSITOS FORMADOS EN UN SISTEMA DE DISTRIBUCIÓN DE AGUA POTABLE

Félix Echeverría1                Juan G. Castaño1                        Carlos Arroyave1                        Gustavo Peñuela2
Auxilio Ramírez3                Jordi Morató4

  

1 Grupo de Corrosión y Protección. Universidad de Antioquia. P.O. Box 1226. Tel: (574) 2196679. Medellín, Colombia. E-mail: jcasta@udea.edu.co
2 GDCON. Universidad de Antioquia. P.O. Box 1226. Medellín, Colombia. E-mail: gpenuela@udea.edu.co
3 Grupo de Investigación en Microbiología. Universidad de Antioquia. P.O. Box 1226. Medellín, Colombia. E-mail: aurape@catios.udea.edu.co
4 Laboratorio de Microbiología Ambiental y Salud. Universidad Politécnica de Cataluña. Terrassa-08222. Barcelona, España. E-mail: morato@oo.upc.edu


RESUMEN 

La aparición de depósitos indeseados en cualquier sistema de distribución de agua potable es inevitable en condiciones normales de operación. Conocer la naturaleza de tales depósitos ayudará a establecer las causas de su formación y, en consecuencia, a mantener altos niveles de calidad del agua. En este trabajo se presentan los resultados de un amplio estudio realizado en el sistema de distribución de agua de una ciudad situada en una zona tropical. La caracterización de los depósitos obtenidos en diferentes sitios a lo largo del sistema se realizó mediante Espectroscopia Infrarroja (IR), Difracción de Rayos X (DRX), Energías Dispersivas de Rayos X (EDS) y Microscopía Electrónica de Barrido (MEB). El análisis de las muestras indica la presencia de tres tipos predominantes de depósitos: depósitos color marrón, tubérculos y depósitos blancos. Se halló que los primeros están constituidos principalmente por aluminosilicatos y ácidos húmicos. Los tubérculos se componen principalmente de mezclas de magnetita, goethita y, en algunos casos, lepidocrocita. Por su parte, los depósitos blancos están constituidos por calcita, aluminosilicatos y cuarzo. Además, se hallaron contenidos de materia orgánica y sólidos volátiles de 14.0 ± 5.0% para los depósitos marrón y de 11.2 ± 2.0% para los tubérculos. 

Palabras clave: Depósitos, sistemas de distribución de agua, biopelículas, tubérculos, análisis fisicoquímicos.


ABSTRACT 

The development of unwanted deposits in any water distribution system is unavoidable under standard conditions. Knowing the composition of such deposits will help to establish the causes of deposit formation and consequently to be able to keep water quality as high as possible. This paper presents the results of an extensive study of deposits found in a water distribution system of a tropical city. Characterization of materials collected across the system was made by infrared spectroscopy (IR), X ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). Analysis of the samples taken at several sites of the system reveals the presence of three predominant deposits: a brown coloured deposit, tubercles and white deposits. Aluminosilicates and humic acids were found to be main constituents in brown deposits. Tubercles were mostly mixtures of magnetite, goethite and in some cases lepidocrocite. White deposits were formed by calcite, aluminosilicates and quartz. Organic matter as volatile solids were 14.0 ± 5.0% for brown deposits and 11.2 ± 2.0% for tubercles. 

Keywords: Deposits, water distribution systems, biofilms, tubercles, physico-chemical analysis.


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Received: August 19, 2008, Accepted: June 17, 2009

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