Saint-André-des-Eaux, France
Saint-André-des-Eaux, France

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Sig A.,Center Technique Assainissement Usines | Fazincani M.,Center Technique Assainissement Usines | Arnaud P.,Center Technique Assainissement Usines | Emica L.,Exploitants Societe des Eaux de LEssonne | And 6 more authors.
Eau, l'Industrie, les Nuisances | Year: 2013

Statutory requirements relating to the quality of discharges are increasingly strict. Protection of sensitive environments consequently requires a reduction in nitrogen concentrations in particular. These targets are achieved through the use of aerobic biological processes. Aeration of the purifying biomass is the largest energy item in a treatment works, averaging 60%. The increasing cost of energy and a desire to reduce the ecological impact of waste water treatment mean that powerful and reliable aeration control devices need to be found and put into practice. Through its WTOS (Water Treatment Optimisation Solutions) range, the Hach Lange company offers solutions for the control of treatment works operations (injection of chemical reagents, management of aeration, control of sludge extraction, etc.). The principle of the module specifically developed to control aeration, WTOS N-DN-RTC, is based on the continuous measurement of ammonium and nitrate ion concentrations inside a biological digester. Following authorisation by the Syndicat Intercommunal d'Assainissement, this equipment was installed at the Marolles-Saint Vrain Syndicat Intercommunal d'Assainissement's sewage works to test this measurement technology using various detectors and checking the effectiveness of control. The investigation took place between the months of March and September 2011.


Pujol R.,Directorate General of Armaments | Arnaud P.,Center Technique Assainissement Usines
Techniques - Sciences - Methodes | Year: 2015

Electrical consumption from a sample of 600 wastewater treatment plants is increasing regularly for the last five years. New plants are more impacted by this evolution. These plants have been implem ented in accordance with the European wastewater Directive (1991), new plants must comply with stringent standards mainly on nitrogen parameters and they are also more complex (odours treatment..). In the same time, total entering pollution rate is stable and therefore specific organic loading rate decreases, ie plant filling ratio. More and more plants are under loaded during long periods so that, operating and functioning conditions are more difficult, with technical and economical problems. The main objective of this paper is to deliver guidelines, best practices in order to get the best compromise between technical and economical point of view. These best practices concern the bid, conception, and the plant operation. The example of under loaded activated sludge is taken into account but most of the items are also useful for other plant configurations. Keep in mind that the plant has to be adapted for functioning with "permanent" under loading rate condition; otherwise energy consumption will go on increasing. © 2015 ASTEE.

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