TECHNICAL AND ECONOMICAL ANALYSIS OF COAGULATION WITH FERRIC CHLORIDE TO ARSENIC REMOVAL OF GROUNDWATER

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María de Lourdes Rivera Huerta
Sara Pérez Castrejón
Alejandra Martín Domínguez
Silvia Gelover Santiago
Areli Gómez Rojas
Carlos Hernández Yáñez

Abstract

Coagulation using ferric chloride followed by flocculation, sedimentation and filtration is an excellent alternative treatment to remove arsenic from drinking water. This paper presents results of a pilot-scale study conducted with groundwater from a well in Torreon, Coahuila, Mexico. The concentration of arsenic in water was 67 μg/ L. At doses of 8.5 mg/L of iron (coagulant) and 0.2 mg/L of an anionic polymer it was possible to obtain an arsenic removal efficiency of 93% and 98% of added iron. The concentration of dissolved solids and pH value of treated water compared to raw water did not change significantly. The sludge generated in the process may be thickened and disposed of in a landfill as it is not a hazardous waste. The cost of treatment per cubic meter was 0.0942 USD, this price includes the cost of reagents and energy.

Key Words: arsenic removal, coagulation, treatment cost

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How to Cite
[1]
Rivera Huerta, M. de L., Pérez Castrejón, S., Martín Domínguez, A., Gelover Santiago, S., Gómez Rojas, A. and Hernández Yáñez, C. 2011. TECHNICAL AND ECONOMICAL ANALYSIS OF COAGULATION WITH FERRIC CHLORIDE TO ARSENIC REMOVAL OF GROUNDWATER. Revista AIDIS de ingeniería y ciencias ambientales: Investigación, desarrollo y práctica. 4, 1 (Jun. 2011), 46–56.

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Author Biography

María de Lourdes Rivera Huerta, Instituto Mexicano de Tecnología del Agua. Coordinación de Tratamiento y Calidad del Agua, Subcoordinación de Potabilización

Corresponding author: Instituto Mexicano de Tecnología del Agua. Paseo Cuauhnáhuac 8532, Col. Progreso, Jiutepec, Morelos, C.P. 62550, México. Tel.:+52(777)3293600. Fax: +52(777)3194381. Email: lrivera@tlaloc.imta.mx