Integrated Management of Coastal Wastewater Discharges

Projet en cours

Industrials partners ACRI ST, NKE
Research partners IFREMER, COM/LOPB, Meteo France, PROTEE-USTV Laboratory, LSEET-USTV
Budget 5 319 K€
Cofinanceur publics French Interministerial Single Fund, Local Authorities and Agence de l'Eau Rhône Méditerranée Corse
Year of labeling 2006 – Joint Certification by Pôle Mer Bretagne
Year of co-financing 2006

Sewerage networks have very different characteristics depending on their design date, topography and the evolution of the population they serve. Also, when major cities are located on the coast, their sanitation are often the cause, particularly in rainy periods, of untreated wastewater discharge (combined storm drains, overstretching of treatment capacity, contaminated rainwater) that have a significant impact on the coastal area it reaches, taking into account the flow of pollution which is set in motion. This project focuses on the impact of sanitation systems (sewerage plants and wastewater treatment, if they have an impact on contaminants) on:

  • The water quality of bathing areas as assessed though bacteriological contamination (sanitation heads the list as one of the reasons for non-conformity of bathing waters as established by the Ministry of Health,);
  • The presence of micro-pollutants (metals and persistent organic pollutants) in the coastal environment.

In order to minimize the impact of sanitation networks on bathing water the network operators and/or local authorities need operational control tools, allowing them to manage the network function and/or technology to take charge of treatment. However, whilst such impact can be minimized it cannot be avoided and therefore there must also be a tool to assess the risks of degradation in the quality of bathing water daily, in order to be able to handle risk situations. When a modelling system estimates a potential risk for a fixed time period during the day, meteorological verification of this time period should be conducted in order to make appropriate management decisions and to inform users (provisional temporary closure of the beach).

Both operational management tools (impact management and risk assessment) will be deployed and tested on four sites: two in the PACA region and 2 in Brittany. These four sites will allow for enough working configurations to be sufficiently representative of conditions encountered around the world:

The final aim of the project will be two operational management tools based on:

  • Knowledge of discharge flows
  • A simulation of their evolution depending on meteorological conditions.
  • A monitoring process.