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Glycol Treatment at London’s Heathrow Airport

Explore the environmental challenges posed by deicing runoff at Heathrow Airport and discover innovative treatment options. Learn about the benefits of upgrading existing wetland systems and the effectiveness of different treatment methods. Comparison with Buffalo Niagara International Airport provides valuable insights.

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Glycol Treatment at London’s Heathrow Airport

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  1. Glycol Treatment at London’s Heathrow Airport Scott Wallace and Mark Liner – Naturally Wallace Consulting David Cooper and Clodagh Murphy – ARM, Ltd. Russell Knight – British Airport Authority

  2. Aircraft Deicing • Deicing fluids include ethylene glycol (EG), propylene glycol (PG) and diethylene glycol (DEG). • Commonly used as a 50% concentrate form (CBOD5 approximately 200,000 mg/L). • Runoff can contain over 20,000 mg/L at 1 oC • New environmental regulations are requiring treatment of deicing runoff. • Major challenge for conventional treatment plants

  3. Deicing Runoff Treatment Options • Anaerobic Digestion (biogas) • Shock loadings, limited net biogas • Mechanical Treatment (activated sludge, MBRs) • Shock loadings, energy intensive • Discharge to Regional Sewer • Long-term concerns over cost and capacity • Passive (ponds and open-water wetlands) • Land intensive, BASH • Subsurface Flow Treatment Wetlands • No water exposed, land intensive

  4. Original Heathrow Constructed Wetlands • Papers published in 2001 and 2004 • 12 reed beds, total area 2.08 ha • Design flow rate 40 L/s; influent COD of 170 mg/L • Removal efficiency of 30-68%, 24-77 kg/ha-d Richter et al. 2004

  5. Overview of pollution control at Heathrow Causeway Nature Reserve – part of Eastern Balancing Reservoirs Spout Lane Lagoon Clockhouse Lane Pit – Cable 1 part of Princes ski club Mayfield Farm main reservoir

  6. The Case for Upgrading Mayfield Farm • Relatively mild winters post original construction (change in design basis) • More stringent consent limits

  7. Buffalo Niagara International Airport • Heavy snow loads in winter • Airfield operations are heavily dependent on effective deicing operations

  8. Treatability Testing • Measure glycol degradation in both warm and cold temperatures • With and without aeration

  9. Aerated rate coefficients, low temperature runs

  10. PG degradation without aeration…

  11. Comparing Treatment Effectiveness • Aerated rate coefficient: 5.30 d-1 • Non-aerated rate coefficient: 0.55 d-1 • An aerated wetland is 10X more effective in treating glycol!

  12. Buffalo – Completed Treatment System

  13. Comparing Heathrow and Buffalo wetlands

  14. Full- ScaleTrialWinter 2009/10

  15. Mayfield Farm Treatment Works Original System Re-engineered System Horizontal subsurface flow wetlands Balancing Reservoir Floating treatment wetlands

  16. Primary Treatment

  17. Secondary Treatment

  18. Aerated Wetland Layout

  19. Aeration Tubing Plow

  20. Tertiary Treatment

  21. Thank You for Your Attention

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