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Treatment of hazardous waste

The decree of April 18, 2002 stipulates what hazardous waste is. It lists 14 hazardous properties, including: explosive, harmful, carcinogenic, mutagenic, etc.

Hazardous waste producers are mainly :

  • manufacturing firms, craftsmen

  • households: DIY, gardening, etc. (HHW: Hazardous Household Waste collected at waste reception centers).

  • Health care sector (IMW: Infectious Medical Waste).

Due to its physical, chemical or biological properties, waste with health or environmental risks cannot be treated in the same facilities as household and similar waste.

Thermal treatment by incineration

 
Incinération

Séché Environnement has a number of incinerator treatment units to propose an offering adapted to all types of hazardous waste, even the most specific ones. Waste accepted can be packaged or loose, solid, pasty, liquid or gaseous.

Direct centers have been set up at the Salaise and St Vulbas sites in order to offer a tailor solution for certain waste requiring special treatment (for example: highly toxic or odorous waste).

Waste is accepted after undergoing analyses, as part of an acceptation procedure to determine a treatment solution that guarantees the handling of waste, under the best environmental and sanitary conditions.

Facilities are equipped with fume treatment and purification systems, before being released into the atmosphere, going well beyond regulatory requirements, in line with the Group's objectives to anticipate future regulations. Emissions are measured and analyzed continuously and controlled by certified laboratories. They are also monitored by DREAL (Regional Directorate of the Environment, Land-Use Planning, and Housing).

The thermal energy released by fume treatment and purification facilities is recovered in the form of electricity and/or steam.

All the sites are managed based on a total approach to progress validated by certifications (for environmental quality or safety), in anticipation of future regulations.

Storage

 
Stockage

Séché Environnement is operating the first ISO 14001 certified Hazardous Waste Storage Facility in the world at Changé (Western France). Only waste in mineral and solid form is accepted at this type of facility. Their acceptance is subject to preliminary analysis, as part of a specific procedure.

Waste is stored in quality assured dedicated cells with impermeability levels well beyond regulatory requirements to guarantee the preservation of the environment in the long-term. Traceability is ensured by 3D-management of the fill, which enables topographical tracking of stored waste.

All incoming waste is analyzed and undergoes leaching (to measure the solubility of water pollutants). If thresholds set by regulations or orders from the Prefect's Office are exceeded, the waste is subject to pre-treatment for stabilization. This technique (the Piertec process developed by the Group) traps all micro-pollutants contained in the waste, rendering it inert or stabilized.

Once they are filled, the cells are rehabilitated, in compliance with Séché Environnement's commitments to safeguard biodiversity.

All the sites are managed based on a total approach to progress validated by certifications (for environmental quality or safety).

Physical-chemical treatment

 
Traitement physico-chimique

Séché Environnement operates physical-chemical treatment centers (see also) dedicated to liquid hazardous industrial waste, often with a high mineral content, contaminated by heavy metals, cyanides, hydrocarbons, etc.

Treatment is based on the type of waste: the treatment of ion-exchanging resins, pH neutralization (acid-base), cracking of oily emulsions by centrifugation, biotreatment, etc.

Sludge (see also) from the treatment of certain waste may be subject to product recovery.

These centers benefit from knowhow and over 30 years of experience in the chemical industry as well as recent work performed by the Group's R&D laboratory.

All the sites are managed based on a total approach to progress validated by certifications (for environmental quality or safety), in anticipation of future regulations.

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