Examinando por Autor "Marmolejo, Luis Fernando"

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  • Miniatura
    PublicaciónAcceso abierto
    Análisis del funcionamiento de plantas de manejo de residuos sólidos en el norte del Valle del Cauca, Colombia
    (2013-12-17) Marmolejo, Luis Fernando; Torres, P. (Patricia); Oviedo, R. (Ricardo); García, M .(Mariela); Díaz, Luis F.
    In Colombia, the acceptance of resource recovery is demonstrated through the high number of municipalities which have introduced this alternative in their integrated solid waste management plans, together with the increasing number of solid waste management facilities (SWMFs) that have been established. This situation also highlights the need for a comprehensive evaluation of the existing experiences as well as research and development around this topic. In this paper, the performance of five SWMFs located in municipalities in northern Valle del Cauca is analyzed. The analysis shows that, despite the fact that SWMFs have operational deficiencies, features such as markets for their products, employment generation and avoided costs in waste disposal in landfills show sufficient grounds for their continuity. Key elements to strengthen SWMFs performance are long-term awareness of service users, adaptation of technologies to the context, enhancement of managerial capacity and better support to resource recovery within the national political framework.
  • Miniatura
    PublicaciónAcceso abierto
    Una mirada a la agroindustria de extracción de almidón de yuca, desde la estandarización de procesos
    (2013-11-20) Torres, P. (Patricia); Pérez, A. (Andrea); Marmolejo, Luis Fernando; Ordóñez, José A.; García, Reinel E.
    In Colombia, the agroindustry of cassava-starch extraction is an important sector of the country's economy; production is focused in Cauca Department; this process uses fresh cassava-roots, water, and electricity as main resources, generating solid and liquid wastes whose inadequate use or disposal brings environmental and economic impacts. In this study were made measures for process optimization supported by tools such as mass balance and study methods, time and motion, considering the technological and socio-economic context of the sector. The results showed process-efficiency between 51 and 59 %; it was identified that the straining stage has the highest water consumption and solid waste generation (fiber cassava pulp); the starch slurry’s sedimentation stage generates the most amount of liquid wastes with high-pollution load. It evidenced the need to standardize and optimize the washing-peeling and strain stages because they require the largest process times; to increase the grating-rasping machine capacity (this critical stage influences the process efficiency and the final starch quality) besides recording the process information as control strategy.