Presentation Fully Automated ISCO (CSME 20-10-2010)

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Presentation Fully Automated ISCO (CSME 20-10-2010)

  1. 1. Reliable use fully automated ISCO-system, CSME 2010 1 Reliable use of a fully automated in situ chemical oxidation system Albert Smits, Gerard Borggreve, Willem Havermans NTP Milieu, The Netherlands
  2. 2. Reliable use fully automated ISCO-system, CSME 2010 2 Presentation Outline During this presentation, I will explain: • Project background • Objective • Unit specifications • Process and performance monitoring • Technology application • Conclusions
  3. 3. Reliable use fully automated ISCO-system, CSME 2010 3 In Situ Chemical Treatment Injection of Chemical Agents into the contaminated soil to oxidize contaminants • introduced in the Netherlands in the late 90s • the most rapidly growing remediation technology • popularity based on removal of large mass in a short time
  4. 4. Reliable use fully automated ISCO-system, CSME 2010 4 Implementation of ISCO • performance: health and safety • application method: injection wells • equipment: tanks & pumps • chemicals: solid / bulk solution, water, acid, iron • monitoring: process and performance • 2 process operators present • 8 hours a day – 40 hours a week
  5. 5. Reliable use fully automated ISCO-system, CSME 2010 5 ISCO Costs  Management  Application  Permitting  Chemicals  Analytical
  6. 6. Reliable use fully automated ISCO-system, CSME 2010 6 Objective To improve the efficiency of injection, with a fully automated remotely controlled ISCO unit in a safe manner
  7. 7. Reliable use fully automated ISCO-system, CSME 2010 7 Unit specifications • two separate compartments - control room - dosing and injection unit
  8. 8. Reliable use fully automated ISCO-system, CSME 2010 8 Control room • equipped with PLC steered telemetric software that adjusts: - necessary amounts - concentrations - sequence for each injection well in selected cluster
  9. 9. Reliable use fully automated ISCO-system, CSME 2010 9 Input screen
  10. 10. Reliable use fully automated ISCO-system, CSME 2010 10 Injection regime
  11. 11. Reliable use fully automated ISCO-system, CSME 2010 11 Dosing and Injection Unit • equipped with: - 2 chemical resistant 700 liters containers - 2 connections with undiluted chemicals - 40 membrane valves that correspond to 1 up to 4 injection wells, shared over 4 separate clusters at one time - each individual well automatically controlled
  12. 12. Reliable use fully automated ISCO-system, CSME 2010 12 Dosing and Injection Unit
  13. 13. Reliable use fully automated ISCO-system, CSME 2010 13 Proces and performance • continuously monitoring of essential parameters - injection pressure - flow rates - amounts of catalyst and oxidant - soil temperature • directly flushing with water when - injection pressure above or beneath threshold - soil temperature above threshold
  14. 14. Reliable use fully automated ISCO-system, CSME 2010 14 Monitoring Screen
  15. 15. Reliable use fully automated ISCO-system, CSME 2010 15 Datalogging
  16. 16. Reliable use fully automated ISCO-system, CSME 2010 16 Technology applicaton Lochem, former wood preservation facility
  17. 17. Reliable use fully automated ISCO-system, CSME 2010 17 Technology applicaton • site characteristics - former wood preservation facility - 500.000 m3 soil contaminated - min. oil 120.000 µg/l - PAH 190.000 µg/l - depth 25 m bgl
  18. 18. Reliable use fully automated ISCO-system, CSME 2010 18 Technology applicaton top view source area side view
  19. 19. Reliable use fully automated ISCO-system, CSME 2010 19 Technology applicaton • excavation of unsaturated zone • to be treated with ISCO - 1.900 m3 of soil volume - 21.250 kg min. oil - 1.050 kg PAH unsaturated zone partly free product aquifer DNAPL loamloam 21250 / 1050 25100 / 625 1450 / 800 M.O / PAH
  20. 20. Reliable use fully automated ISCO-system, CSME 2010 20 Technology applicaton
  21. 21. Reliable use fully automated ISCO-system, CSME 2010 21 Technology applicaton Demonstrated at Lochem, the Netherlands • 24 injection wells (2 depths) • 2 injection periods of 3 weeks • 120 m3 H2O2 35% • 340 m3 iron catalyst • 24 hours a day – 7 days a week
  22. 22. Reliable use fully automated ISCO-system, CSME 2010 22 Technology applicaton 42,5 40 37,5 35 32,5 30 27,5 25 22,5 20 17,5 15 12,5 10 Temperature logging
  23. 23. Reliable use fully automated ISCO-system, CSME 2010 23 Technology applicaton Remediation results after 2 injection periods: • max 47% reduction of min. oil concentrations • max 94% reduction of PAH concentrations after initial increase (300%) • no more free product/emulsion • additional treatment with biosparging and nutrient dosing
  24. 24. Reliable use fully automated ISCO-system, CSME 2010 24 Conclusions The fully automated ISCO-unit showed • undisturbed operation 24/7 • minimum human oversight • maximum efficiency • reliable safe use Available to specific contamination problems inside and outside of The Netherlands
  25. 25. Reliable use fully automated ISCO-system, CSME 2010 25 Thank you for your attention

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