Mylor Yacht Harbour

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Mylor Yacht Harbour

• Tributyl Tin Contamination

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Background

• Mylor Yacht Harbour
• Falmouth, Cornwall
• Create an area of Hard Standing
• Car Park
• Boat Storage

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Problem

• Tributyl Tin (TBT) Contamination
• 0.44-0.68 mg/kg
• Limited Solubility
• 4mg/l at 20C
• Ongoing Risks to Aquatic Organisms
• Crustaceans
• Filter Water Through them

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Solution

• E-Clay Technology
• Portland Cement
• Cost
• 80,000
• Duration
• 2 months

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Technology

• Lab Studies with E-Clays
• Treatment Slurry
• Portland Cement, 5
• Modified Organoclay, 0.5
• Treats 10m³ per Batch
• Ex-situ
• Treatment Zone

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Process

• Dredging
• Treating
• Envirotreat Process
• 2,300m3
• remediation target of 50 µg/l
• 99 reduction
• Replacing

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Benefits

• Material Reuse
• No Stock Piling
• Toxic Material Treatment
• Cost Effective
• Unit Cost 20/m²
• No Ongoing Monitoring
• Reduced Leachability

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Limitations

• Contaminated Material Still Onsite
• Limits Future Development

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Alternative Solution 1

• Total Soil Replacement
• Deposition in Landfill
• Large Quantity of Replacement
• Expensive
• Inefficient

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Alternative Solution 2

• Thermal Desorption
• Reduction to less than 1.0 mg/kg
• Not overly affective against Heavy Metals
• Stabilizing Agents
• Reduce Leachability
• Treated Soil Backfilled

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TBTs

• TBTs were banned in the late 1980s
• Ban on all European Ships, 2003
• Teqmar Antifoul developed as a substitute

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Thank You for Listening