WARDLE METALS, Powys, Wales, United Kingdom
Investigation & Restoration of an Aluminium Recycling Plant
An investigation of hydrogeological conditions at an aluminium recycling facility was
undertaken as part of a major expansion of waste disposal facilities.
Aluminium scrap is reprocessed inside a reverbatory furnace; hot highly reactive waste slag, which may be liable to spontaneous combustion is removed from the furnace and sprayed with water prior to deposition within a former clay pit to ‘cure’ by exposure. The waste remains reactive for many years, leaching ammonia and metals
in solution.
The former brick pit had been excavated into clays overlying sand deposits. Both
perched and semi-confined groundwater was impacted by ammonia, elevated Electrical Conductivity, aluminium,copper and iron, with a an elevated (alkaline) pH.
A geotechnical appraisal of the suitability of on-site clays for landfill development was
undertaken. The restoration plan for the existing landfill comprised perimeter
earthworks, capping and restoration. Groundwater contamination was addressed
through a perimeter cut-off drain and ongoing monitoring.
An investigation of an adjacent field for development of a new above-ground landfill
was undertaken. Detailed landfill development costs were prepared, including provision of a leachate pre-treatment plant to reduce high-strength leachate necessary before disposal to sewer.
Stuart Jeffries
Hydrosolutions Pty Ltd
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