Licensed Treatment & Recycling Facility

Treatment and Reuse of Contaminated Dredgings at Falmouth Harbour, Cornwall

The Challenge

The disposal of a significant volume of contaminated dredged material from Falmouth Harbour was required, to improve the navigational and cruise facilities. These works were necessary to facilitate and sustain the long term economic growth of Falmouth’s cruise business. The contamination consisted mainly of anti-fouling agents Tri-butyl-tin (TBT’s) and hydrocarbons. The total volume of dredging was approximately 2,000 m3. The hazardous nature of the dredged material limited the number of commercial viable disposal options in the are – to dispose traditionally of the material at landfill would have been prohibitively expensive.

The Solution

ATG Group designed a site specific remedial plan, which provided a sustainable alternative solution to the traditional method of transport dredged material to a hazardous landfill.

As licensed Waste Carriers, ATG group transported the material to a purpose built, licenced treatment facility in Truro, to carry out the following remedial treatments;

Treatment (as pre-agreed with the EA) included:

  • Dewatering of dredged material and the subsequent filtration of leachate for discharge.
  • Lime stabilisation.
  • Bioremediation to reduce moisture content and improve structural properties, using a specially adapted mixing unit, leaving the formerly hazardous hydrocarbon contaminated material fit for reuse on site, as restorative landscaping.

The Benefits

Benefit 1

Benefit 1

The client was able to ensure continuity of harbour operations during works and comply with all legislation regarding the disposal of dredgings, with a commercially viable treatment solution.

Benefit 2

Benefit 2

Savings of £50,000 on traditional landfill disposal were realised.

Benefit 3

Benefit 3

By this treatment process, an engineered material was produced, which rather than being disposed of at landfill, was retained on site to provide much needed sustainable landscaping material on site.

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