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H23G07: Environmental Geotechnology Presentation

H23G07: Environmental Geotechnology Presentation. Mixed Technology Remediation of a F ormer C hemical Works , Cadishead , Greater Manchester. By Ka Hang CHAN Ting Ting LIM. Location. Cadishead Site. History. 1900-1965 Refining crude tar & fractioning chemicals 1965-2006

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H23G07: Environmental Geotechnology Presentation

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  1. H23G07: Environmental GeotechnologyPresentation Mixed Technology Remediation of a Former Chemical Works, Cadishead, Greater Manchester By Ka Hang CHAN Ting Ting LIM

  2. Location Cadishead Site

  3. History • 1900-1965 • Refining crude tar & fractioning chemicals • 1965-2006 • Storage facility for heavy fuel oils • 2006-current • Housing plan by Harrow Estates

  4. SiteDetail • Size of site • 6.5 hectare • 120,000m³ contaminated soil • 6,000m² of groundwater sources • Potential receptors • Local residents • Off-site groundwater receptors in sandstone aquifer • Adjacent sites • Future users of new homes

  5. Contaminants

  6. RemediationMethods Alternatives: • Traditional excavate & dispose strategy • Ex-situ biological treatment followed by a groundwater treatment • Multi-technology Remediation: • Ex-situ bioremediation for hydrocarbon contaminated soils (90,000m³) • Ex-situ chemical oxidation (500m³) • Multi-phase extraction (4000m²) • Air Sparging (1,000m² + 1,000m²)

  7. AirSparging • Principles • Reducing concentration of volatile organic compounds(VOCs) • Air sparging lances driven into the aquifer using direct push technique • All vapours collected adsorbed by carbon

  8. How Air Sparging works?

  9. Air Sparging Sparging Well Air Blower Installation of Sparging Lances

  10. AirSparging – Pros & Cons

  11. Results • Over 6.5 tonnes of VOCs recovered • Project Costs - £6.3m • 85% - soil treatment • 15% - groundwater treatments • Unknown contamination sources • Odours & VOC emissions • Grant planning permission • 392 dwellings on the 17 acre site • ‘Best use of a combination of remediation techniques’ • Shortlisted in 2008 Brownfield Briefing Awards

  12. AnyQuestions?

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