Stabilising and storing
Some wastes cannot be recovered. SITA has developed state-of-the-art industrial know-how to design and operate hazardous and non-hazardous waste landfill facilities.
Non-hazardous waste landfill
The waste is contained in specialised areas, or cells, to collect all of the effluents resulting from natural degradation:
- the leachates are collected and treated in our treatment plants or at specific industrial facilities
- the biogas is captured and routed towards energy recovery facilities.
Landfill sites include equipment superior to that demanded by current standards, especially regarding waterproofing. Once their operation is over, they are monitored for a minimum of 30 years.
Hazardous waste landfill
Waste containing pollutants is put into specialised landfill facilities. Security barriers (layer of clay materials, geomembrane and geotextile) as well as traceability and daily monitoring procedures guarantee protection of the environment.
Stabilisation means solidifying waste to neutralise the mineral and organic pollutants. First to adopt this technique, SITA FD has developed processes to neutralise the pollutants and improve their resistance and solubility. Once stabilised, the waste is stored in the site’s cells.
SITA has developed special partnerships with the Natural History Museum, regional parks and the LPO to protect species present in the natural environment of the landfill sites. The species are monitored and specific action is taken. Closed landfill sites are greened over in line with the local environment.
62 non-hazardous waste landfill sites (ISDND)
7 inert waste landfill sites (ISDI)
9 hazardous waste stabilisation and landfill sites
- The Hersin Coupigny (Pas-de-Calais region, France) non-hazardous waste landfill site
In 2001, SITA won the Energy Regulatory Board tender. Hersin Coupigny became one of the first and most important biogas recovery centres in France.
This site can hold up to 600,000 tonnes a year and recovers 85% of the biogas produced as heating or electricity. This recovery supplies the EDF network with 4.8MWh electric power, enough to supply a town of 16,000 households.
SITA BioEnergies participated in the original tender, carried out deposit studies, built the facilities and operated them. At first, three flues were installed, but a fourth one was added in 2002 to handle the biogas production of the site.
In terms of biodiversity management, SITA has decided to go beyond its regulatory obligations in biodiversity protection and is committed to integrating this protection throughout the life of its sites. SITA also factored in the local environment when designing the facility.
- The Bellegarde (France - Gard) hazardous waste landfill site
On this 36 hectare facility, SITA FD treats and stores various hazardous waste products (resulting from incineration, effluent treatment, metallurgy, industrial water treatment plants, paints etc). The site is equipped with a chemical analysis laboratory to control the waste and determine whether it can be sent directly to landfill or if it has to be stabilised beforehand. The ‘cold’ waste stabilisation and solidification plant is then used to obtain the pollutants before going to landfill