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The efíiciency of a modified sewage stabilization pond system in Ixtapan de la Sal, Mexico, was evaluated. The system was formed by an anaerobic pond with an highrate clarifier, and a facultative and a maturation pond. Physical (temperature and conductivity), chemical (pH, DO, BOD5, COD and solids) and biological variables (total and fecal coliform and fecal Streptococcus) were measured every two weeks through a six month period. A fissure in the clarifier wall caused the system to break down, letting raw organic matter of the clarifier go into the anaerobic pond and to the rest of the system. Two performance periods were established according to the observed changes in the ponds (color, odor, presence of flocs). Removal efficiencies during the first period (BOD5 = 84%, COD = 70 % , total coliform = 99 % , fecal coliform = 97 %) were higher than those of the second period (BOD5 = 82 % , COD = 18%, total coliform = 80%, fecal coliform = 85%). The BOD5 removal in both periods were similar and adequate. Removal of the remaining variables were significantly lower. Nevertheless, the system fulfilled in both periods most of the standards imposed by the Mexican Legislation. When working properly, the modified system reached removal efíiciencies similar to those obtained in the original system that used another facultative pond. The modified system implied reducid construction area as well as reduced function and maintenance costs.

Palabras clave: stabilization ponds, subtropical Mexico.
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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2017
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