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This article aims to socialize the results of the development and implementation of a system based on IOT for aquifers, with its application in the estuary of the Rio Magdalena in Colombia. The SISME software supports the identification processes of different factors that can influence the appearance of the saline wedge in the navigable channel of the river. These aspects bring about the improvement of maritime safety and, in turn, allow us to know different aspects related to behavior through continuous sensing of the river. This article shows both the characterization of this river as well as studies related to it and the location of the sensors and description of the software developed. [ABSTRACT FROM AUTHOR]

Introduction. This article shows the evaluation of the demand and the tendencies of fuel in the plant of ANDERCOL-Medellín, the current and future trends of the prices for the fuels available (fuel oil and natural gas) and also the operation costs, the investments required for their substitution and the limitations and benefits of substituting fuel oil with natural gas. Objective. To evaluate the impact of substituting fuel oil with natural gas in the ANDERCOL's plant in Medellín. Materials and methods. A technical study was made in order the make the fossil fuel substitution project feasible, taking into account the current gas net both in and out of the plant, the consuming index and regulation, the oil heater burner and the burners of the boilers. The project took 14 months divided into two big phases: a) the substitution of the current equipment into natural gas and b) the connection of the new equipment to that same fuel, according to the prospective of future demands of the market. Results. Making the substitution of gas oil to natural gas has a cost of US $ 112000 and benefits per month of US $ 9700, therefore, it is easy to be executed. Besides, 62% of the benefits of the project is supported by the lower cost per energy unit gas has if compared with fuel oil. Conclusion. Substituting the fuel oil equipments to a natural gas system represents, also, an environmental benefit not yet measured, because CO2, CO, SO2, NOx and other material's particles emissions are lower with gas oil, thus permitting the accomplishment of the future environmental regulations, a better economical feasibility and a reduction of production costs, increasing the company's competitiveness in its sector. [ABSTRACT FROM AUTHOR]