Water expertise France

Sanitation and rainwater

PROJECT / Seine Morée wastewater cleaning plant SIAAP - France

SIAAP - 04/07/2015 Tag Tags : Water quality , Membrane Technology

Sanitation and rainwater ( 28 posts )

The Greater Paris Sanitation Authority (SIAAP)

City, Country: Le Blanc-Mesnil, Seine-Saint-Denis Department, France


French partner submitting the project description: The Greater Paris Sanitation Authority (SIAAP) 

Project Owner: The Greater Paris Sanitation Authority (SIAAP)

Clients: 6 municipalities in the northwestern part of the Seine-Saint-Denis department (Aulnay-sous-Bois, Sevran, Tremblay, Vaujours, Villepinte and a part of Blanc-Mesnil and the Roissy-Charles de Gaulle airport)



Dates of project: 2014 


A few words on the project…

The Morée, flowing under the plant and gave it its name, is a small river (12 kilometers long) gradually reduced to the sewer role since the nineteenth century. By now receiving treated water from the plant, the Morée has regained its biological and chemical quality conducive to the development of biodiversity. The Seine Morée plant is used to ensure that wastewater is cleaned very thoroughly while limiting the use of chemical reagents.


Background or General project description

The Seine Morée plant is designed to achieve the goals of the European Union Water Framework Directive and to contribute to the renewal of the Morée, a small stream that crosses the site on which the plant is located.


French Expertise

The plant is in charge of the treatment of the wastewater of six municipalities in the north east of the department of Seine Saint Denis, near Paris. This covers 200 000 habitants. Its construction is part of an integrated vision of wastewater and sanitation management.

In order to do so the plant uses highly innovative technology based on biological treatment and membrane separation sludge:

After pretreatment, which aims to remove large debris, sands and fats, water undergoes a biological settling for the treatment of dissolved pollutants. The technology does not require chemical reagents.

After biological treatment for the removal of carbon, phosphorus and nitrogen, the water undergoes a final step, unprecedented in sanitation at this scale, membrane ultrafiltration, which allows the removal of dissolved elements.

The Seine Morée plant produces high quality discharges that can be used for watering and industrial uses.

As a result, 99% of suspended matter, 95% of carbon pollution, 97% of phosphorous pollution and 70% of nitrogen pollution are removed.

For sludge treatment, a new partnership was set up between two public industrialists, the Greater Paris Sanitation Authority (SIAAP) and the municipal association of household waste treatment (SYCTOM).

Sludge from water purification will be treated with biowaste in a biogas plant.

Residual wastewater after sludge treatment return to the Seine Morée plant to be cleared. 100% of the common waste will be recycled as a source of energy for the plants’ needs or in the form of fertilizers for agriculture.


Strengths of project

The plants architecture meets the very latest environmental requirements and treats 500.000 m3/ jour.


More information