Keeping Madrid clean and green

A large-scale strategy to use recycled water for park irrigation and street cleaning services is underway in the Spanish capital. Over 14hm3 of treated waste water will be recycled thanks to the South East network for waste water re-use project, replacing the potable water currently used to keep parks and gardens green and to wash down streets and pavements.

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The project forms part of the Madrid Water Re-Use plan that covers a series of actions to be taken on a zone-by-zone basis across the city, to the benefit of around three million inhabitants.

A more sustainable approach to water management

The complete use of waste water as an additional source for activities that do not require potable water is the aim of the Madrid Water Re-Use Plan which covers the municipal waste-water treatment plants (WWTPs) of Viveros, La China, Las Rejas, Valdebebas and La Gavia.

These facilities already use the most modern tertiary waste water treatments allowing the treated water to be recycled. The Plan also involves the installation of mesh networks and interconnections along with storage facilities and pumping systems to get the purified wastewater out into the network.

The projected requirement for park irrigation and street cleaning is 8 087hm3 of water a year. Madrid’s City Council plans to use waste water by drawing up a large-scale strategy and developing it with fixed facilities and permanent management.

Up-grading the existing system

The project involves the construction of three networks in the South East of Madrid: action includes work on the distribution network and the expansion of the tertiary treatment of waste water at the treatment plant at Las Rejas and la Gavia. It will also necessitate the work on the interconnection between La Gavia and La China.

A total of seven actions will be undertaken and the project covers three of them.

In relation to the first, construction includes: a main pipeline of 20km long which will form the regeneration of the water network supplying treated water to parks and reservoirs, five buffer reservoirs of regenerated water, five pumping stations, automation and inspection enabling the supply of ten parks in the area, and the expansion of tertiary treatment at Las Rejas which will bring an additional capacity of 200 litres per second to the current capacity of 800.

The second includes: interconnection between the plants at La Gavia and La China including a dual pipe of 4.7km which allows the connection to reversible. This also entails the adaptation of the existing pumping station.

For the third action covered by the project, the plant at La Gavia will be expanded to increase capacity to 250 litres a second.

Draft date