AREMA AND RUBAU AWARDED THE CONSTRUCTION AND OPERATION CONTRACT FOR THE COLLECTOR AND THE NEW CASANOVA WASTEWATER TREATMENT PLANT IN MAÇANET DE CABRENYS, GIRONA

January, 2021

The Catalan Water Agency has awarded UTE AREMA – RUBAU – CICLAGUA the contract to construct and run the high-level collector and the new WWTP on the Casanova urban infrastructure located in Maçanet de Cabrenys (Girona) for an amount in excess of € 4 million. 

The purpose of the contract is to carry out the necessary construction work involving collectors along with a WWTP that will enable the waste water generated in the municipality of Maçanet de Cabrenys to be piped and treated. 

The project entails the construction of an 847.6-metre collector (DN 400 mm) that will intercept the waste water from the current point of discharge into the Frausa stream, and will run along the left bank of the stream, crossing the Ardenya stream where the incorporation that will bring the remaining waste water from the municipality to the entrance to the WWTP’s screening chamber will be located. There will be two spillways along the collector, each one at the point of connection to the sewage network, through which, the surplus volume when it rains will be discharged into the Fraussa and Ardenya streams respectively after the thicker solids have been retained in the grate. The waste water piped by the collector will be treated in the WWTP planned for the south of the Casanova urban development.   

The solution put forward for the WWTP is a purification process using activated sludge with a prolonged aeration biological treatment comprising of the elimination of nutrients, secondary decanting, and sludge treatment through rhizo-composting. With a capacity of 300 m3/day, the treatment plant will provide the water that has been duly treated in the Frausa stream, improving the quality of the Muga river basin from an environmental perspective.

The project, which is expected to get underway in January 2021, is scheduled to be completed in October of the same year. After that, the start-up and operation period will get underway, which will take another year. This is the first contract jointly awarded to AREMA and RUBAU since Grupo Rubau acquired AREMA, the company that specialises in water, waste and the environment. Its commitment to the 2030 Agenda and its sustainable development and ecological transition objectives are thus reinforced.

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