There is a growing concern regarding the scarcity of natural resources. The levels of resource exploitation generated by the current system of production and consumption has led the European Commission to develop a set of guidelines that aim to reduce the pressure on natural resources. The set of guidelines proposed by the European Union is based on the transformation of the current linear economic system into a circular system in which resources and materials remain in the production system for longer. However, for this change to take effect, practical measures are required. This paper presents an industrial symbiosis approach as a practical application of a circular economy model. The aim of this paper is to develop a guide to successfully implement an industrial symbiosis network, demonstrating that industrial symbiosis can achieve the goals of a circular economy. To demonstrate this, an example of its implementation is provided in a region of Spain, which is responsible for producing approximately 95% of the total ceramics products in the nation. This study emphasises the set of barriers that need to be addressed in order to make new models a reality for business and consumers, society, and the environment.

The current amount of data coming from all kinds of devices together with the incessant increase in computing capacity is revolutionizing almost all existing sectors, and the water sector is no exception. The monitoring of urban water cycle infrastructures makes it possible to generate a large amount of data, this information, previously processed, helps to increase the efficiency of the processes carried out in these infrastructures, from catchment to purification and subsequent discharge. This information, in addition to improving internal aspects such as the operation and maintenance of the infrastructures, allows them to be linked to multiple other variables in other sectors, making new technological approaches and more effective management strategies possible. A practical example is wastewater treatment plants. From the perspective of the circular economy, these infrastructures are capable of producing a large amount of resources, which, if properly managed, can reduce the pressure on conventional resources. In this sense, digitization allows the integration of the different market players, thus optimizing the supply and demand of these resources and ultimately advancing the practical application of the circular economy. This paper reviews the potential of digitalization in the urban water sector and proposes numerous practical examples to accelerate the transition towards economic, social, and environmental sustainability.