Taking advantage of the energy contained in the biosolids generated in a wastewater treatment plant (WWTP) is one of the processes of greatest interest due to the opportunity to obtain an energy resources from a waste. The aim of this research was to analyze the environmental sustainability use of biosolids generated in a wastewater-treatment plant for energy-production by fluidized-bed gasification under exergy analysis. The energy-production system was based on previous studies of sustainable-emergy alternatives using biosolids. Sustainability of the process was evaluated by identifying stages in the energy-production system (from drying application to electricity generation) where it is possible to reduce useful energy losses as well as identifying the value of waste streams within the system through exergy analysis. It was illustrated the destroyed exergy and the efficiency by stage and by product in order to assess the effects of inefficiencies in the process sustainability. The mixture of biosolids with coal was identified as a highly sustainable stage of the process, as it presents the highest index of exergy sustainability (0.99), in contrast to the stages of energy-transformation (turbine) and gas-cleaning, which efficiencies are 0.17 and 0.4, respectively. Energy-transformation and gas-cleaning stages are of interest in terms of an improved energy recovery process, making it more efficient by applying new technologies and/or using the waste streams that have high energy potentials.

Resumen Las reservas de petróleo proveniente de reservorios convenvionales en Colombia son escazas, la relación reserva/producción en el país es de 5 años. De esta manera, la búsqueda por nuevas reservas y producción de nuevos recursos son imprescindibles. Así, la producción de yacimientos no convencionales es una salida a la escasez de producción de crudo. Este trabajo evalúa la factibilidad técnica y económica de la producción de un yacimiento de roca generadora Tight Oil, fueron considerados parámetros como factor de forma de la fractura, propagación de la fractura, presión de fracturamiento, precio internacional del petróleo, características petrofísicas, propiedades de los fluidos, costo de perforación, completamiento y el régimen fiscal. El desarrollo metodológico del trabajo permitió concluir que este yacimiento ubicado en la cuenca del valle medio del magdalena tiene potencial de producción y que factores como el tipo de completamiento, técnica de perforación y costo del levantamiento del recurso tienen un impacto significativo en la viabilidad del proyecto.

Abstract Conventional oil reserves in Colombia are depleted. The country´s reserve-to-production ratio is estimated as 5 years. Therefore, the search for new resources and their conversion into proven reserves are essential. In this case, the production of unconventional reservoirs is an option in Colombia. This work evaluates the technical and economic feasibility of the production of a Tight Oil source rock reservoir, considering parameters such as fracture shape factor, fracture propagation, fracture pressure, international oil price, petrophysical characteristics, fluid properties, drilling cost, completion, and fiscal regime. The methodological development of the work allowed concluding that this reservoir located in the middle Magdalena Valley basin has production potential and those factors such as the type of completion, drilling technique, and cost of lifting the resource have a significant impact on the viability of the project.

Resumen En este artículo se escogió un campo colombiano el cual está ubicado en Puerto Nare, Antioquia donde se tiene una buena ubicación para instalar la energía Solar por Concentración (CSP), la cual consiste en concentrar calor mediante el sol, con el fin de generar vapor y suministrarlo e igualmente poder hacer esto sin ausencia de irradiación solar, mediante este artículo se evidenciara el cálculo LCOE mediante el simulador System Advisor Model (SAM) teniendo en cuenta diferentes factores, obteniendo un valor de 0,4kW/$, el cual nos dice que es bastante rentable. Por lo tanto, esta energía es viable para la implementación en la inyección cíclica de vapor al campo colombiano TECA, donde se quiere predecir el cálculo la tasa de producción mediante un modelo analítico e igualmente se calculó las pérdidas de calor, con el fin de conocer la temperatura adecuada de vapor para la inyección cíclica.

Abstract In this article, a Colombian field was chosen which is located in Puerto Nare, Antioquia where there is a good location to install Concentrated Solar Power (CSP), which consists of concentrating heat through the sun, to generate steam and supply it and also be able to do this without the absence of solar irradiation, through this article the LCOE calculation will be evidenced by the System Advisor Model (SAM) simulator taking into account different factors, obtaining a value of 0.4kW /$, which tells us which is quite profitable. Therefore, this energy is viable for the implementation in the cyclical injection of steam to the Colombian TECA field, where it is desired to predict the calculation of the production rate through an analytical model and calculate the heat losses, to know the proper steam temperature for cyclic injection.

Resumen El efecto termoeléctrico permite la conversión directa de energía térmica en energía eléctrica sin necesidad de piezas móviles y sus aplicaciones son infinitas Los vehículos de combustión generan pérdidas de energía de hasta un 62% y se estima que la eficiencia con generadores termoeléctricos puede incrementarse hasta un 8%. En este trabajo se propone un sistema de aprovechamiento del calor de los gases de escape por efecto termoeléctrico. Se desarrolló un modelo computacional utilizando el método de elementos finitos. A partir de las simulaciones, se puede realizar un análisis de las variables eléctricas en función de la temperatura. Existe una buena correlación entre el modelo y los datos obtenidos. Sobre la base del sistema modelado, fue posible evaluar un sistema de generación de hasta 120W con una eficiencia del 5,8%, lo que representa un aumento de hasta el 3% en la eficiencia global.

Abstract The thermoelectric effect allows the direct conversion of thermal energy into electrical energy without the need for moving parts and its applications are endless, with only the availability of a temperature gradient. Combustion vehicles generate energy losses of up to 62% and it is estimated that efficiency with thermoelectric generators can be increased by up to 8%. In this work we propose a system of waste heat from exhaust gases from the thermoelectric effect. A computational model was developed using the finite element method. Based on the simulations, a set of curves of electrical variables can be made as a function of temperature. There is a good correlation between the model and datasheet data. Based on the modeled system, it was possible to evaluate a generation system with the generation of up to 120W with 5.8% efficiency, representing an increase of up to 3% in overall efficiency.