Reuse of wastewater Baix Llobregat wastewater treatment plant in Barcelona, Spain2 Barcelona Approx. 4 million people live in and around Barcelona and also the majority of the Catalonian industry is located in this area. The water supply to the town comes from groundwater as well as treated water from the river of Llobregat that is relatively saline. Clear water is a limited, however, vital ressource in the Mediterranean area. Barcelo

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