The Lille metropolitan area awarded Veolia Water the contract to reconstruct the Marquette-lez-Lille wastewater treatment plant (WWTP) in 2010, the biggest such facility in the north of France. The capacity of the new WWTP is 700,000 m³/day, serving a population of 620,000. It will be built on the site of the previous one, which is now obsolete.

The renovation work comprises four treatment lines, including wastewater, stormwater sludge treatment lines, and a deodorization line. By applying state-of-the-art design and proven technologies, especially Hybas™ and Exelys™-DLD, a sustainable development solution was provided to local communities.

The effluent from the new plant will meet the requirements of the European Water Framework Directive (Directive 2000/60/EC) on ‘good ecological status’ of water, and the treated storm water will be used to irrigate 7 hectares wetland. Compared with conventional digestion, the Exelys™-DLD configuration will further reduce sludge quantities by 30% and increase biogas production by 20%. Thereby, 94% of the power requirements will be supplied from the plant itself.

The water line started operating in February 2013, and commissioning of the sludge line, which started in July 2014, was expected to finish in February 2015. In this paper, the design concept of the sustainable development solution is presented, as well as the application of showcase technologies for wastewater and sludge treatment.

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