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Press releases
25/09/2000 Degrémont chosen for the wastewater treatment plant in Tours
Degrémont (a subsidiary of the Suez Lyonnaise des Eaux water business) has been chosen by the bidding commission of the Tours area to upgrade and extend the local treatment plant. Working in association with Stereau on this FF 313 million (47.7 million euros) contract, Degrémont will supply 55% of equipment.
To meet the required level of performance and contribute to efforts to improve the quality of the water in the Loire, it will be necessary to rebuild most of the units and equipment. The plant will process wastewater from the homes of the 400,000 inhabitants in the Tours area. In rainy weather, it will treat a peak flow of 5,200 m3/h compared with 3,350 m3/h at present. It will also eliminate nitrogen and phosphorus pollution.
The solution adopted is based on three biological treatment lines, backed up by three 100 m2 Densadeg® lamella settlers for tertiary treatment. These units eliminate phosphorus, trap the last suspended solids and contribute to the reliability of the installation.
The sludge produced by water treatment undergoes thickening, digestion, centrifugal separation and lime treatment before being re-used on farmland.
Another important aspect of this contract is that the plant must fit into the landscape. To maintain quality of life for the residents, the most sensitive units have been covered and a system put in place to collect and treat foul air. To the same end, the hydraulic line of the plant is designed to lie as low as possible so that the hydraulic units barely emerge. The objective is keep the site looking like a natural park.
Degrémont designs, builds and operates water production installations, treatment plants and sludge treatment facilities for municipalities and industry. With turnover of 819 million euros in 1999, the world leader in water treatment engineering employs almost 3,600 people and is present in more than 70 countries.
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