The Council of Ministers, at the request of the Ministry for Ecological Transition and Demographic Challenge (MITECO), approved on Tuesday the works of improvement of the facilities of the Wastewater Treatment Station (EDAR) of Maqua, in Avilés, and the additional actions necessary for the treatment of the wastewater, of very high saline content, for an estimated value of 57,910,697 euros.
The contract is aimed at the execution of the civil works and the installation of the necessary equipment to improve and expand the facilities currently existing in the EDAR, with the objective of purifying the waters to be treated to meet the conditions of discharge to “normal area” of an urban agglomeration of more than 150,000 equivalent inhabitants.
This action has been divided into several phases as a result of the characteristics of the raw water that reaches the WWTP, with a high salt content. The performances are framed as follows:
- Improvement project. Necessary actions as a consequence of the change of cataloguing of the receiving medium from less sensitive area to normal area.
- Additional actions due to the high salinity of raw water. Additional actions to the proposed treatment as a consequence of the high conductivity of the waste water.
- Actions due to the presence of hydrogen sulfide gas in the network, which has caused the deterioration of certain elements.
- Facilities for the treatment of odors.
- Sludge digestion and energy recovery facilities. Actions of optimization of the current process.
The works have a period of execution of 36 months, of which 30 correspond to the execution and six to the period of testing and start-up, after a favourable supervision report by the general subdirectorate of Public Domain Hydraulics and Infrastructures.