SUEZ ENVIRONNEMENT uses incineration to dispose of both hazardous and non-hazardous waste. It can thus be transformed into fuel to produce heat, which in turn is transformed into steam or electricity to supply urban networks. In 2010, SUEZ ENVIRONNEMENT produced 2.4 million MWh of electrical energy and 1 million MWh of thermal energy. Since 1 February 2011, SITA France has been operating the SYCTOM energy recovery centre in Ivry. For a full year, this facility should produce 1 million MWh of thermal energy (i.e., equivalent to the heating of 100,000 homes).
The Group also uses specialised incineration systems to treat hazardous waste (e.g., liquids with a high chlorine or sulphur content). In Europe and Asia, SITA operates 9 special units, including the SCIP hazardous waste incineration plant in Shanghai, China. Moreover, the SUEZ ENVIRONNEMENT subsidiary has 9 household waste incinerators capable of disinfecting and destroying the pathogenic substances generated by hospitals.
In parallel, SUEZ ENVIRONNEMENT and SITA have developed the innovative concept of High Performance Cogeneration (CHP+). This system allows the total or partial recovery of the heat available at low temperatures in waste-to-energy plants. Several projects, compliant with the Group’s sustainable development requirements, are currently being deployed in Europe with market gardeners. For example, at the Econotre site, near Toulouse, vegetable producers use this technique to heat their greenhouses.
SUEZ ENVIRONNEMENT also recycles clinker, i.e., the solid residues stemming from the incineration of non-hazardous waste.
Novergie recycles growing amounts of clinker. They are first stored on special platforms for 2 months to complete their natural chemical transformation. Once stabilised then treated, part of this clinker can be used to build roads as an alternative to gravel obtained from quarries. These operations result in savings of 93 metric tonnes of CO2 equivalent per kilometre of road.