Leading Industrial Water Reuse in Southern Spain
As climate change and population growth increase the demand for freshwater, finding innovative solutions for water management is more critical than ever. In northeast Spain (Catalonia), Aguas Industriales de Tarragona S.A. (AITASA) is driving innovation by regenerating treated wastewater for industrial use, ensuring sustainable water management in one of Europe’s most water-stressed regions.
The project focuses on the reuse of treated wastewater effluent from the city of Tarragona and nearby smaller cities (Vilaseca and Salou). The treated water is repurposed for industrial use in the Camp de Tarragona industrial area, home to a large petrochemical complex. AITASA manages the production and distribution of this treated water to industries in the Tarragona petrochemical complex – including BASF, Covestro, Dow, Ercros and Respsol – which are leading the way by reusing treated wastewater for their operations.
Since it first began supplying treated water in 2013, the project has expanded to support growing industrial demand. With a treatment capacity of 19 million litres per day – equivalent to the daily water consumption of Tarragona – the project provides a vital, independent water source for industrial processes like cooling, reducing the need for fresh water supplies (Ebro river).
Advanced Water Treatment Technology
To meet strict standards for industrial reuse, the treated wastewater undergoes a multi-stage purification process, utilizing advanced technologies from Veolia Water Technologies. Physical-chemical treatment, micro-sand-based flocculation, and reverse osmosis ensure that the water meets the highest quality standards before being distributed through a 22-kilometer network to the industrial complex.
This water reuse initiative exemplifies how collaboration between industries and water authorities can promote sustainable development. By transforming wastewater into a valuable resource, the Camp de Tarragona project not only supports industrial growth but also helps alleviate pressure on natural freshwater supplies, benefiting both the local population and the environment.
Future Water Recovery Initiatives
Looking ahead, the Tarragona petrochemical complex is continuing to innovate. A new initiative led by EURECAT technology center aims to increase water recovery by 20 % by removing high concentrations of ammonia from reclaimed water. This project includes testing advanced reverse osmosis with membrane distillation. The goal is to maximize water recovery and reuse within the Tarragona complex, further reducing the need for fresh water from natural sources.
In addition, AITASA is working for the Tarragona petrochemical complex on the expansion of the current Camp de Tarragona Water Reuse Plant, with the aim of increasing its regenerated water production capacity by 50%. Besides, the Tarragona petrochemical complex and AITASA aim to also reuse the treated industrial wastewater generated by the petrochemical complex, and for this purpose, pilot tests are now being carried out.
