Waste management group CSG plans to “significantly increase” the volume of incinerator air pollution control residue (APCR) it treats after developing new technology at its specialist hazardous waste handling facility.
The company’s new process means the corrosive materials can now be taken to landfill safely. The Environment Agency-permitted process, which has undergone a 12-month trial, is in operation at CSG’s facility at Cadishead, near Manchester.
APCR is the product of processes used to control air pollution, which capture heavy metal emissions and neutralise acid gases at incineration facilities. The lime-based residues are difficult to treat and recycle because they contain hazardous contaminants.
But the lime-rich ashes have pozzolanic properties similar to cement, which can be used in a treatment process to help solidification and reduce the possibility of leaching of metal contaminants.
CSG’s process blends the residue with non-hazardous liquid wastes, during which leachable metals become immobilised and liquids are solidified, to produce a waste which meets the Landfill Waste Acceptance Criteria.
It also treats dusty wastes which would otherwise be hazardous to handle.