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

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

  • Reliable use fully automated ISCO-system, CSME 2010 Reliable use of a fully automated in situ chemical oxidation system Albert Smits , Gerard Borggreve, Willem Havermans NTP Milieu, The Netherlands
  • Presentation Outline Reliable use fully automated ISCO-system, CSME 2010 During this presentation, I will explain:
    • Project background
    • Objective
    • Unit specifications
    • Process and performance monitoring
    • Technology application
    • Conclusions
  • In Situ Chemical Treatment Reliable use fully automated ISCO-system, CSME 2010 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
  • Implementation of ISCO Reliable use fully automated ISCO-system, CSME 2010
    • 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
  • ISCO Costs Reliable use fully automated ISCO-system, CSME 2010 Management Application Permitting Chemicals Analytical
  • Objective Reliable use fully automated ISCO-system, CSME 2010 To improve the efficiency of injection, with a fully automated remotely controlled ISCO unit in a safe manner
  • Unit specifications Reliable use fully automated ISCO-system, CSME 2010
    • two separate compartments
    - control room - dosing and injection unit
  • Control room Reliable use fully automated ISCO-system, CSME 2010
    • equipped with PLC steered telemetric software
    that adjusts: - necessary amounts - concentrations - sequence for each injection well in selected cluster
  • Input screen Reliable use fully automated ISCO-system, CSME 2010
  • Injection regime Reliable use fully automated ISCO-system, CSME 2010
  • Dosing and Injection Unit Reliable use fully automated ISCO-system, CSME 2010
    • 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
  • Dosing and Injection Unit Reliable use fully automated ISCO-system, CSME 2010
  • Proces and performance Reliable use fully automated ISCO-system, CSME 2010
    • 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
  • Monitoring Screen Reliable use fully automated ISCO-system, CSME 2010
  • Datalogging Reliable use fully automated ISCO-system, CSME 2010
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 Lochem, former wood preservation facility
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010
    • site characteristics
    - former wood preservation facility - 500.000 m 3 soil contaminated - min. oil 120.000 µg/l - PAH 190.000 µg/l - depth 25 m bgl
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 top view source area side view
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 unsaturated zone partly free product aquifer DNAPL loam 21250 / 1050 25100 / 625 1450 / 800 M.O / PAH
    • excavation of unsaturated zone
    • to be treated with ISCO
    - 1.900 m 3 of soil volume - 21.250 kg min. oil - 1.050 kg PAH
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 Demonstrated at Lochem, the Netherlands
    • 24 injection wells (2 depths)
    • 2 injection periods of 3 weeks
    • 120 m 3 H 2 O 2 35%
    • 340 m 3 iron catalyst
    • 24 hours a day – 7 days a week
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 42,5 40 37,5 35 32,5 30 27,5 25 22,5 20 17,5 15 12,5 10 Temperature logging
  • Technology applicaton Reliable use fully automated ISCO-system, CSME 2010 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
  • Conclusions Reliable use fully automated ISCO-system, CSME 2010 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
  • Reliable use fully automated ISCO-system, CSME 2010 Thank you for your attention