The potential application of renewable energies is diverse, and they have demonstrated their suitability in their application to the size and operation of activities. Rural tourism is one of the products with the greatest potential for growth within the tourist offer of the island of Gran Canaria, as it combines sustainable development and respect for the natural environment. Among the renewable energies with high applicability in rural environments, we highlight photovoltaic solar, low-temperature solar thermal and the methanation of waste and wastewater generated in tourism. This article shows a methodology adapted and developed for the study of the water-energy-waste nexus, considering parameters of waste generation, water and energy consumption, the occupied area and potential renewable energy generation in rural houses in Gran Canaria and evaluates their environmental profitability. It has been concluded that applying these renewable technologies can significantly reduce the carbon and ecological footprint of the activity of rural houses based on the available surface. This contributes to achieving the energy and environmental objectives proposed by the EU to achieve decarbonization by 2050.

In this study, the main elements that can make up a Natural Treatment System for Wastewater (NTSW), its most important parameters and properties of operation and design, have been analyzed, as well as the environmental problems derived from the generation of large amounts of slurry. The objective of this paper is to propose a methodology to improve the operation of these systems, associated with small and medium-sized livestock farms, in insular and isolated systems such as the Canary Islands. An Integrated and Resilient System (IRS) for monitoring and measuring operational variables quasi-continuous and in situ is proposed. Low-cost technology and open source hardware are employed, as well as application of the IoT (Internet of Things) strategies to share and analyze the information collected in the cloud. In view of the high degree of resilience and the simplicity of this type of technology, as well as its low cost, it is concluded that it is feasible to create a measurement system with these characteristics that can be used for NTSW parameterization, and other purposes. Satisfactory results were obtained for several parameters (ambient temperature, relative humidity, UV radiation, atmospheric pressure). It is presented as a novel proposal based mainly on low-cost technology and free software with which to improve the NTSW operation process.