The project to adapt the treatment line at the El Endrinal WWTP in the Madrid region (Spain) produces high volumes of inert waste, earth and stones from the excavations and concrete rubble from demolition work. The WWTP currently serves nine districts or parts of them: Alpedrete, Collado Mediano, Collado Villalba, El Escorial, Galapagar, Guadarrama, Moralzarzal, Navacerrada and San Lorenzo del Escorial.

Given the size of these works, high volumes of inert waste, earth and stones are expected to be generated from the excavations, as well as concrete rubble from the demolition work.

In order to comply with the applicable regulations, minimise waste generation and foster the circular economy, the project will give priority to the use of these leftover products. Whenever it is technically possible and as determined by the works consultant, the reuse of excavation surpluses will also be studied. Existing concrete structures, foundations and walls will also be demolished for subsequent reuse.

First, the material resulting from crushing the concrete waste from the demolition of existing foundations and walls was prepared for recycling, together with the large chunks of granite obtained from the excavation work to extend the WWTP. All this was done having made the preliminary notification as a valuer to the Madrid Regional Government.

• Following the excavation and demolition work, the material was taken to be stockpiled on the adjoining plot of land so that the granite chunks and demolished concrete could be reused. The resulting material was classified according to its type.
• The end product, aggregate recycled from crushing, is intended for use preparing work platforms, preparing the ground for temporary occupation and backfilling behind walls.

Thanks to this initiative by FCC Construcción and the company's strong commitment to minimising waste generation, the project focused on the reuse of materials to reduce their environmental impact.

During the excavation and demolition work, considerable amounts of earth, granite chunks and concrete were produced. To address this challenge, the stone and concrete waste was crushed. The resulting material -clean earth, granite pieces and recycled concrete- was reused, thereby supporting the more sustainable use of resources and the reduction of waste.