Regulatory file for the development of pilot project in Murviel-lès-Montpellier - 2015
Activity sectors
Services
Partners
Project
Murviel-lès-Montpellier, a commune located at west of Montpellier, has a lagoon treatment plant (1500 EH) which reach overcapacity and that arise questions about its resizing. The effluent is currently discharge is in a temporary watercourse. Two agricultural plots of 0.5 ha are could be watered with treated wastewater from this station.
The Reuse's interests for this territory are multiple: the possibility of irrigation on vineyards that are currently outside plans for extension of an irrigation canal, the anticipation of water needs for the vine in the context of global warming and lastly the durability of the vineyards by maintaining quality local production.
The pilot project should make it possible to remove certain questions:
- techniques by a feasibility study and installation of the pilot in the field, and evaluation of the efficiency of this new treatment sector with respect to certain parameters (organic matter, nitrogen, phosphorus)
- financial by comparison of costs between the establishment of a BRL network and the use of lagoon waters
- acceptability by growers with respect to this alternative water resource and the societal impact of this use of wastewater for the vine.
The originality of this project lies in the fact that there is a strong desire of the town of Murviel-lès-Montpellier to develop this sector of reuse of treated wastewater and that this will is supported by winemakers. The latter are seeking new irrigation opportunities in the town for their vineyards since they note an abandonment of certain plots due to lack of water.
Ecofilae’s actions
The development of the pilot requires a prefectural authorization.
To establish this authorization, Ecofilae has proposed to actors the preliminary actions of opportunity evaluation and diagnosis prior to the implementation of the pilot. These preliminary steps make it possible to assist IRSTEA in the success of the project and in particular the assembly of the regulatory file for the prefecture. Indeed, unlike a sanitation project, the reuse of domestic wastewater is specific to the territory and it necessarily requires a multi-stakeholder approach (sanitation-agriculture in particular).
Given the experimental aspect of the project, Ecofilae support IRSTEA with the derogation request to justify the irrigation of water of lesser quality than the one targeted by the decree in force which makes the project sensitive and requires a technical, health and agronomic arguments.
