The project involved the modernisation of a wastewater treatment plant in the city of SETE located in the south of France. The modernisation will enable treatment of increased capacity of wastewater that can be treated, allowing to continue the very sensative and important process of shellfish farming activity in this area.
The Project Targets 
The Solution HDPE pipes SDR 17 to SDR26
Welded connection: EF up to and including 315mm, above 315mm EF or Butt fusion.
1000mm SDR26 Fabricated Y with 53° outlet + 4 PLASSON Super LightFit PN 6 couplers. An essential part that allows a connection of the new station to the treated wastewater discharge outfall.
The PLASSON solution provided the best means (compared to cast iron and steel solutions offered) to integrate assembly constraints, in particular the installation time, due
to the important ecological issue.
As expected, the installation of the collector required an installation of a “by-pass”, in order to reject part of treated water of the Station in the channel of La Peyrade river and fishing structure crossing the city, not intended to receive effluents directly from the treatment plant!
In order to preserve the natural environment, limit the bacteriological impact of the water and all risks on shellfish-growing areas while
working, a system for disincfection of the treated waters was put in place.
The system ensured admissible microbiological flows during installation of the collector. The entire shellfish farming field was informed and made the relevant preparations. A maximum period of 4 days was given for construction of the collector.
4 SUPER LIGHTFIT PLASSON and 1 TEE to the rescue of oyster beds!
The PLASSON solution provided the ability to combine two welding techniques depending on the diameters and site configurations: electrofusion and butt welding.
Major advantages in favor of PLASSON PE solution: light weight, flexibility, sealing thanks to the welded solution, no corrosion, chemical insensitivity to effluents (wide spectrum), adaptation to the differential ground settlements created by the basins.
Sealing provided by welding.
PLASSON supplied LIGHTFIT couplers and shaped fittings (elbows, tees, stub end) from diameter 180mm to diameter 800mm.
Electric scraper PF 355-1200mm
