Rainwater and wastewater networks

Rainwater and wastewater networks

The construction of wastewater and rainwater drainage networks, together with the associated civil engineering, is the second of SADE’s historic business activities.
In addition to techniques for installing prefabricated pipelines, SADE has also mastered the technology of laying cast-sewer pipes and the methods required for underground working with large diameter main sewers.

Sewerage systems, obviously

SADE undertakes the design, construction and reconditioning of hydraulic networks and installations such as stormwater basins, pumping stations and special works. It can also offer solutions to industrial client that have to upgrade their installations to comply with standards and regulations: networks separation, installation of oil separators, construction of containment basins, outfall structures, etc.
For its municipal and private clients, SADE has become specialised in tailor-made wastewater plants using different water and sludge treatment processes, and meeting their requirements as regards both treatment capacity (from 30 to 15,000 E.I.) and the choice of process and environmental conservation (landscape integration, reduction of odour nuisance, ecological treatment solutions, etc. SADE designs and builds new works and also undertakes the reconditioning of existing works or the extension of overloaded systems.

Pipes and connections

For sewerage systems, SADE undertakes:

  • users’ connections to new or in-service networks,
  • renovations of connections to in-service sewer networks.

Download the data sheet Sewage collector


Networks rehabilitation: tailor-made and cost-effective technical solutions...

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Related facilities

Civil engineering works, essential additional network installations...

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Wastewater depollution units

The depollution unit is an essential link in the wastewater collection chain: treating and guaranteeing the discharge of purified water into the natural environment and thus avoiding its pollution. Ever since the 1992 Water Act that imposes minimum levels of wastewater treatment prior to discharge, SADE has been designing and constructing reliable and durable systems in strict compliance with the regulations in force.

Whether with activated sludge, on reed-bed filters (wet lands) or mixed, the depollution units proposed and constructed by SADE are a tailor-made response adapted to the type of effluent and other requirements, to the proper geographical context and to the constraints of each municipal or private client.
SADE is a complete service provider: study and consultancy, detailed design and construction, operator training and plant maintenance, if required.
As proof of its expertise and know-how in this field, SADE has close to 800 installations to its credit:

  • nearly 500 new or modernised extensive systems, including 330 with reed filter beds and 120 with sand filters;
  • nearly 300 new or modernised intensive systems, including 160 with activated sludge;
  • around 15 industrial depollution units.

By integrating an environmental dimension into each of its projects, SADE designs depollution units with planted dissipation zones; about 30 of these are installed, half of them with willows or alders.

Operational flow diagram:

Compliance with standards and regulations

In keeping with a desire to preserve the world around us, upgrading industrial sites to comply with standards and regulations has the major objective of avoiding the risk of polluted discharges into the natural environment.
Being fully aware of the environmental, financial and logistical constraints on production sites, their industry sector, size or geographical location, SADE offers technical solutions that enable industrial businesses to fulfil their obligations to comply with French laws and EU directives concerning the environment (particularly in the areas of water and discharges) and thus validate their policy’s priorities (aims and objectives) within the framework of their environmental management system (see Standard ISO 14001) or compliance with prefectural bylaws governing classified facilities.
In partnership with industrial businesses, SADE assists them to upgrade their plants to comply with standards and safety regulations:

  • evaluation of site discharge pollution,
  • cartography and diagnosis of networks and existing installations,
  • implementing environmental safety measures (prevention of accidental pollution),
  • installation of treatment systems and oil separators,
  • networks separation,
  • networks rehabilitation,
  • polluted water containment and discharge works,
  • measurement, surveillance and alarm systems, etc.

As part of this approach, SADE provides a complete service package: project design study, installations and works diagnosis, specification of necessary works and alternative technical proposals, project execution including works on active sites.

Effluents containment

Accidental or chronic pollution hazards through the dispersal of dangerous products are some of the anthropogenic risks to be taken into consideration, especially from industrial businesses and road and utilities operators. SADE offers these organisations a range of effluent containment solutions.
Effluents dangerous to health and the environment must in all circumstances follow a controlled route. In case of fire, industrial accident or heavy rainfall, these effluents must remain contained and in no way spread, flow or leach into the natural environment.
To meet these risks, SADE provides turnkey solutions and guides its clients from start to finish in the design, installation and maintenance of site safety equipment. Whether new or to comply with standards and regulations, SADE provides tailor-made solutions for specific requirements.

For the management of pollution hazards, SADE’s service provision includes:

  • risk analysis (network diagnosis, risk identification and evaluation, etc),
  • securing of unloading areas,
  • blocking-off networks,
  • storage or containment tanks
  • warning stations
  • general pollution detection
  • upgrading fire-fighting systems

Individual sewerage systems

The 30 December 2006 Act governing water and aquatic environments imposed the specifications for a zoning plan whereby household wastewater must be treated by an individual sewerage system that complies with the required discharge standards.

This provision was reinforced in the summer of 2010 by the Grenelle II Act.

For many owners, this means a complete rehabilitation of their installation.

With public authorities as clients or directly requested by private individuals, SADE installs this equipment under SPANC supervision. In order to manage hydrogeological and installation constraints in the field, SADE uses all treatment methods (ground treatment processes, media filters or micro-stations).

SADE installs and maintains this type of equipment, and also takes care of its servicing and monitoring, thus ensuring the expected purification efficiency and longevity of the system.

Dry dock areas

Dry dock areas are port facilities used for ship maintenance. Activities in these locations create dirty water which, before being discharged into the natural environment or being reused, needs to be collected and treated in order to meet environmental and regulatory requirements.
SADE offers port facility operators and shipyards tailor-made solutions to meet these requirements as regards wastewater collection, treatment and recycling.

In addition to macro-waste requiring special treatment, ship maintenance operations carried on in dry dock areas, particularly when using high pressure washers, release water that is polluted with suspended solids, metals, organic micro-pollutants, detergents, hydrocarbons, etc.

The collection, treatment and recycling of this polluted water is therefore an environmental and regulatory requirement.

Whether undertaking new projects or bringing existing installations to compliance with standards and regulations, SADE designs and implements turnkey solutions:

  • geotechnical and hydraulic studies,
  • earthworks and civil engineering,
  • installation of wastewater collection systems,
  • systems for storing, treating and recycling polluted water,
  • installation servicing and maintenance.

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SADE is expert in using many network diagnosis techniques to meet the requirements of operators...

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Underground main sewers

As with retention basins, underground main sewers serve as ‘buffer’ solutions enabling a sewer network to deal with occasional overloads. In urban areas, underground main sewers linked to sewerage systems can easily handle heavy cloudbursts of rain.
Consisting of a linear system of pipes, underground main sewers must conform to precise length and diameter (volume) specifications, and also siting and configuration stipulations.
As well as their design, SADE is able to undertake all types of underground main sewers with traditional methods of installation (digging and earthworks) or with trenchless techniques (microtunnelling, etc.).

SADE - 23-25 av. du Docteur Lannelongue - CS 51450 - 75685 Paris Cedex 14