Monitoring the quality of effluents in a unitary sanitation network (Paris and Pau [France]: Estimating carbonaceous, nitrogen and phopsphorus pollution from physical measures
Résumé
The monitoring and use of data concerning the quality of effluents transiting through the sanitation systems (sewerage networks and wastewater treatment plants) are necessary to increase the level of control and optimization of their operation. The Innovation and Environment Department of Siaap (Syndicat interdepartmental pour I'assainissement de I'agglomeration parisienne) has initiated, with its scientific partners, R&D actions aimed at developing processing ways to transform raw data into useful information for sanitation system operators. In this paper, mathematical laws are proposed and discussed that make it possible to link easily available physical measurements in sewerage networks [turbidity, conductivity) to the effluent quality: particle matter concentration, organic matter concentration (Chemical Oxygen Demand [COD}), ammonium (NH∗1 and total phosphorus (Ptot) concentrations. Results show that 1) turbidity allows an accurate estimation of particle matter and COD concentrations and 2) conductivity allows a fairly accurate estimation of ammonium concentrations and a quite good estimation of the phosphorus concentrations. Even if conclusions are valid for both studied watersheds (Paris and Pau), mathematical laws are significantly different considering the area but also considering time. This is mostly the case considering the correlation between conductivity and nitrogen for the Paris catchment area.