Soto Gutiérrez WWTP (Madrid)

The Soto Gutiérrez WWTP, managed by Canal de Isabal II S. A. and located in the municipality of Ciempozuelos, is required to meet the parameters set out in legislation, particularly with respect to nutrient removal.



Canal de Isabel II, S. A., through its Department for the Construction of Wastewater Treatment and Reuse Facilities, is the developer of the Soto Gutiérrez WWTP. The plant was built by FCC Construcción S. A., and technical assistance was provided by a consortium composed of Euroconsul and Getinsa/Payma.

The objective of the design project was to define the necessary modifications to the existing treatment lines in order to achieve the required nitrogen removal targets, given that phosphorus removal was currently being carried out effectively. The Soto Gutiérrez Wastewater Treatment plant is made up of a number of elements constructed in different stages.

In Stage 1 (1990), a dual water line was built. This line comprised primary settling, a bioreactor and secondary settling, along with a sludge line with aerobic digestion.

Stage 2 (2001) saw pretreatment being extended and the capacity of the water line was doubled. The aerobic digester was renovated as a new bioreactor and a new sludge line with anaerobic digestion was implemented.

Stage 3 subsequently saw the addition of tertiary treatment with a view to reusing part of the flow.

The plant currently has an average treatment capacity of 26,000 m3/day. It features four lines of equal capacity and sufficient free land to extend this capacity by 50%. The facility was initially conceived for carbon removal and now features a chemical phosphorus removal process with ferric chloride dosing.

Plant Report published in: #61 FuturENVIRO June 2019