Compliance with the Directive, enhanced water quality and lower energy consumption.
The project for the upgrading of the current facilities and nutrient removal at the Salamanca, Palencia and Valladolid WWTPs encompassed removal of nutrients from the return streams from sludge dewatering by means of treatment with anammox bacteria, as well as a number of improvements to the existing facilities. These enhancements will enable treated water with total nitrogen values of less than 10 mg/l and phosphorus values of less than 1 mg/l to achieve compliance with Directive 91/271 (sensitive areas with over 100,000 population equivalent), improved quality of the waters of the rivers Tormes, Carrión and Pisuerga, and reduced energy consumption at the WWTPs.
Total investment in the three plants amounted to €12,018,335.75, which includes the cost of building the infrastructures, the design and the technical assistance to the works management.
The work carried out was funded in the following way:
- 20% of total investment was provided by the proprietary funds of the Duero River Basin Authority (Confederación Hidrográfica del Duero), which operates under the auspices of the Ministry of Agriculture, Food and Environmental Affairs.
- 80% of total investment came from European Funds (Operational Programme ERDF Cohesion Fund 2007-2013: Priority axis 2: Environment and Sustainable Development; Priority area 46: Sanitation and wastewater treatment).