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SADE sees double

November 6, 2020

Down near Dax, the small town of Castets plans to position itself as the new surfing El Dorado by playing host to a tourist complex, complete with a giant wave pool.

This project and the population growth it will entail mean the town’s WWTP’s capacity needs to be doubled in advance. The Les Landes SYDEC (Departmental Municipal Equipment Authority) has selected SADE (head of consortium) and its partner Gallego for this mission.

The challenge

The goal, is to design and build the new infrastructure and partially modify the existing systems to boost treatment capacity from 2,750 PE to 5,500 PE, as well as adding a new sludge treatment line, without suspending services. This doubling will mean the activated sludge WWTP can handle an average dry weather flow rate of 50m3/h and a peak flow rate of 90m3/h. Designed by SIng and the Bordeaux Regional Division, this project is a genuine technical challenge, and therefore right up SADE’s street!

The core of the worksite

Doubling the plant’s capacities firstly requires the construction of two imposing concrete basins. The first, an aeration basin, has an internal diameter of 12m. It is a 6m-high, semi-inground structure featuring 3 fine-bubble aerators and 2 agitators. The second, a clarifying basin, is used to separate effluent from activated sludge floc. It has an internal diameter of 14m and its tapered bottom varies its height from the centre to its edges from 4.90m to 3.30m. This top-notch facility is equipped with a radial scraper bridge including both bottom and surface blades.

Ancillary? More like essential.

Adding an extra treatment section and creating a new sludge treatment section, as well as maintaining continuous service requires not only inch-perfect organisation, but also the construction of so-called ancillary facilities, which are actually essential to ensure the whole system works properly. Of course, this includes new systems and a partial overhaul of existing equipment, as well as high-pressure air generating sets, a deaerator, electrical systems, automated systems, etc.

Delivered on time

Previously a T&M project, the WWTP was taken under SYDEC’s wing in January 2020, and the contract awarded to the SADE/Gallego consortium. Following modification of the project on request from the new project owner, work began on the site in September 2020 after 2 months of preparation and will be completed by the end of April 2021. An even more impressive feat when you consider that this change of management came against the backdrop of the current sanitary crisis.

Repurposed sludge

Once the project has been completed, the plant’s sludge will be compacted and dehydrated in a specific unit, then sent in pellet form to a SYDEC repurposing centre in Thalie. Once there, it will go through a proven, secure process to repurpose wastewater treatment sludge for agricultural use. This is a fine example of the local circular economic network to which SADE is proud to contribute.

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23-25 av. du Docteur Lannelongue
75014 Paris

  • IN BRIEF
    • Profile
    • Anchoring
    • Path
  • PROFESSIONS
    • Systems
    • Infrastructure
  • SERVICES & SOLUTIONS
    • Regional authorities
    • Industries
    • Major infrastructures
  • REFERENCES
  • CSR
  • APPLICATIONS
  • NEWS
  • CONTACT

Legal notice Ι Anticorruption code of conduct Ι Occupational gender equality index Ι Personal Data Protection Policy Ι Suppliers relationship © 2021 All rights reserved

Fraud Warning

It has come to our attention that emails have been sent by individuals falsely claiming to be SADE employees. The objective of these emails is to place false orders using our company’s name. Read more…

In the emails detected to date, the fraudsters are writing from the addresses “[email protected]” or “[email protected]”. They use our logo and Paris 75014 address.

We wish to draw your attention to the fact that these email addresses do not correspond to SADE’s email address, which bears the domain name sade-cgth.fr.

We thus advise caution in your communication and request that you do not exchange documents or information with persons other than your usual contacts at SADE. If you are in any doubt, we advise you to speak to your usual contacts prior to the transmission of any document or information.

As fraudsters regularly change their operating mode, we also recommend you alert all your employees likely to have dealings in this area (purchasing, accounting or payroll, etc.).

SADE systematically lodges an official complaint in response to such acts. We would be grateful if you could notify us at the following address of any contact you may have had with individuals claiming to be employees of our company: [[email protected]]