969 resultados para Universidad Nacional de Cuyo. Sistema Integrado de Documentación


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Objective. To assess the potential for contamination of wastewaters from pig farming. Methods. Wastewaters from pig farming were stored in a tank. After 0, 30, 60, 90, and 120 days of hydraulic retention, they were added to lysimeters filled with argillaceous, sandy, or medium soil. Finally, these lysimeters were submitted to simulations of either a rainy season or a dry season. The number of colony-forming units (CFUs) of total coliforms, fecal coliforms, and fecal streptococci was measured in the effluents of the storage tank (for the various periods of hydraulic retention), in the percolate from the lysimeters, and in the three types of soil. The microbiological analyses were carried out using the membrane filter technique. The pH analyses were done potentiometrically. Results. For the three microorganisms, the largest decrease in bacterial counts in the storage tanks occurred with 90 or 120 days of retention. There was a marked decrease in the bacterial count in the percolates of the three soils. For the three soil types the greatest reduction in bacterial counts was found in medium soil, due to its acidity (pH < 7.0). Hydraulic retention was not sufficient to ensure the sanitary adequacy of the wastewaters and their use for irrigation, given that fecal coliform values were above 1 000 CFU per 100 mL. Therefore, adding the residues to the soil was considered a second stage of treatment. Conclusions. The retention of wastewaters followed by adding them to soil was effective in minimizing the contaminating effect of pig farming residues. The storage time for wastewaters from pig farming could be decreased from 120 to 90 days.

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Incluye Bibliografía

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El Manual recoge la experiencia de DOCPAL/CELADE en la indizacion de los documentos ingresados a la base de datos y se orienta a servir de guia a las unidades de informacion que han adoptado tecnicas manuales o semi-mecanizadas para el tratamiento de la misma en la region. Previa la presentacion de las definiciones basicas, se discute el marco de referencia y las caracteristicas del proceso de indizacion. La descripcion de los instrumentos y pautas pone enfasis en la utilizacion del Tesauro Multilingue sobre Poblacion para el analisis de la informacion y en las Tarjetas Unitermino, para el registro del proceso.

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Incluye Bibliografía

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Comenta las actividades en materia de información sobre población del Instituto en lo que se refiere a confección de una base de datos bibliográficos poblacionales; los planes futuros; y limitaciones y obstáculos al desarrollo de estas actividades.

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Incluye Bibliografía

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Incluye Bibliografía