Permitting: Cement Kiln Dust Landfill

Case Study

In co-operation with other partners we undertook the data analysis, interpretation and hydrogeological risk assessment which helped facilitate an application for planning permission for a new landfill cell. It was successfully demonstrated to the Environment Agency that the site posed a low risk to groundwater and surface water receptors and, consequently, planning permission and a Pollution, Prevention and Control (PPC) permit were both obtained. We also helped tackle any concerns the Environment Agency had and clarified the water management arrangements at the site.

cemex-logoCEMEX are a major manufacturer of cement in the UK. They operate a quarry at Southam where clay is excavated for use in the Rugby cement plant. A residue of the cement manufacturing process, Cement Kiln Dust (CKD) is then disposed of in landfill cells in the resulting void.

 

We have supported CEMEX with landfill operations for CKD over many years. When CEMEX required a new CKD landfill phase, we, in conjunction with Ove Arup and Partners, developed the design and undertook the necessary risk assessments to obtain planning permission and a Pollution, Prevention and Control (PPC) permit.

 

A hydrogeological risk assessment was undertaken which successfully demonstrated to the Environment Agency that the site posed a low risk to groundwater receptors.

 

A key issue of this risk assessment was to demonstrate that background groundwater quality was poor due to natural ground conditions and that historical CKD disposal operations had not contributed to a deterioration in groundwater quality.

 

Furthermore, the Environment Agency raised concerns that potentially contaminated groundwater could be drawn into the current quarry dewatering sump. We reviewed previous risk assessments that had been undertaken for historical CKD disposal areas and presented a detailed risk assessment for the whole quarry. This conclusively demonstrated that the risk from such migration to the quarry sump was very small. As a result, CEMEX has been able to clarify water management arrangements at the site.