Examinando por Autor "Betancur, John F."

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Acceso Abierto
info:eu-repo/semantics/article2015-11-11
Estudio evaluativo del manejo de biosólidos para el caso de la Planta de Tratamiento de Aguas Residuales (PTAR) El Salitre.
Bolívar Meléndez, Nydiana Astrid; Betancur, John F.; Rodríguez Valencia, Nelson
El tratamiento de las aguas residuales provenientes tanto del sector residencial como el industrial, genera gran cantidad de lodos residuales o biosólidos, estos reciben diferentes tipos de tratamientos para su posterior uso y/o disposición final. Entre los más comunes se tiene su uso como enmienda orgánica, recuperación de zonas afectadas por la explotación minera, agricultura, fabricación de elementos cerámico entre otros, además de lo anterior un porcentaje de estos tienen como destino final rellenos a cielo abierto, ocasionando problemas sociales y medio ambientales. Existen diversas alternativas usadas a nivel mundial, entre las que se encuentra su uso como generador de energía para disminuir los costos de funcionamiento de las plantas de tratamiento de aguas residuales (PTAR’s), esta es la alternativa analizada para el caso de la PTAR El Salitre.
Acceso Abierto
info:eu-repo/semantics/article2015-02-17
Influence area determination of rain gauge stations in the coffee region, Caldas department, Colombia
Valencia A., Julián A.; Castillo R., Oscar G.; Betancur, John F.; Peña Q., Andrés J.
According to statistics of DANE (2012), Caldas department has suffered a significant reduction in the coffee planted area; it was 92,000 hectares in 2005 and 79,000 in 2012. However, this crop is still of great importance for the region as it represents about 6% of the provincial gross domestic product (GDP). According to Rojas and Gast (2013), decrease in planted area could be explained by reduction in coffee production in recent years. This reduction was related to wet environmental conditions (excessive rainfall) during last years, and it is largely explained by the presence of four “La Niña” events during this time frame. In order to define the area of action for a weather station in an Andean region, records were used of daily rainfall alone last 25 years, taken from a network with 21 weather stations. Daily data were analyzed by using geostatistics, taking into account the experimental semivariograms to define the range of action of a weather station. Specifically, the concept used was the range, calculated from the experimental semivariogram. Results show that, on average, in the Andean region, a rainfall station has between 6 km of a radius influence (daily data) and 15 km of radius (annual data).