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NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
NAPL Site Remediation (HMVT)
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NAPL Site Remediation (HMVT)

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  • 1. In-Situ Remediaton Removal of 1.500 m 3 LNAPL Jack van Rossum Ronny Hilhorst Hannover Milieu- en Veiligheidstechniek SPE Vienna February 23 th , 2011
  • 2. Contents Presentation SPE <ul><li>Introduction HMVT </li></ul><ul><li>Case: LNAPL removal in the Port of Antwerp </li></ul><ul><ul><li>Site information </li></ul></ul><ul><ul><li>Soil & Pollution </li></ul></ul><ul><li>Shallow LNAPL </li></ul><ul><ul><li>Tender </li></ul></ul><ul><ul><li>Remediation approach and system </li></ul></ul><ul><ul><li>Remediation Equipment </li></ul></ul><ul><ul><li>Water and air treatment </li></ul></ul><ul><ul><li>Results </li></ul></ul><ul><li>Deep LNAPL </li></ul><ul><ul><li>Remediation approach </li></ul></ul><ul><ul><li>Results & costs </li></ul></ul>
  • 3. HMVT: Experts in-situ soil remediation HMVT <ul><ul><ul><li>Experts in in-situ soil remediation, water and air treatment </li></ul></ul></ul><ul><ul><ul><li>Excavation, extraction, biological and chemical techniques </li></ul></ul></ul><ul><ul><ul><li>Since 1988 </li></ul></ul></ul><ul><ul><ul><li>45 Employees </li></ul></ul></ul><ul><ul><ul><li>Offices in the Netherlands and Belgium </li></ul></ul></ul><ul><ul><ul><li>Member of Antea group </li></ul></ul></ul><ul><ul><ul><li>Advise, Design, Pilot & Bench scale testing </li></ul></ul></ul><ul><ul><ul><li>Contracting, Operation & Maintenance </li></ul></ul></ul><ul><ul><ul><li>Risk based contracting </li></ul></ul></ul>
  • 4. Brief description location Site information <ul><ul><li>Oil and chemicals storage terminal in the port of Antwerp </li></ul></ul><ul><ul><ul><li>Storage tanks </li></ul></ul></ul><ul><ul><ul><li>Pumping stations </li></ul></ul></ul><ul><ul><ul><li>Contractors village and other buildings </li></ul></ul></ul><ul><ul><ul><li>Underground and above ground pipelines </li></ul></ul></ul><ul><ul><ul><li>Roads and railways </li></ul></ul></ul><ul><ul><ul><li>Contamination caused by leakage at pumping station (naphta) and a storage tank (diesel) </li></ul></ul></ul>
  • 5. Site LNAPL
  • 6. Brief description soil Site information: Soil <ul><ul><ul><li>Ground level has been raised up to 4 – 6 meters with sandy </li></ul></ul></ul><ul><ul><ul><ul><li>material for port constructions </li></ul></ul></ul></ul><ul><ul><ul><li>Original clayey soil is still present (5 – 7 mbgl) </li></ul></ul></ul><ul><ul><ul><li>Groundwater level 2,5 mbgl </li></ul></ul></ul><ul><ul><ul><li>Groundwater level fluctuates ca 1 meter between summer and winter </li></ul></ul></ul><ul><ul><ul><li>Debris of former village on clay layer </li></ul></ul></ul>
  • 7. Brief description contamination Contamination <ul><ul><li>Contamination: LNAPL of naptha & diesel </li></ul></ul><ul><ul><ul><li>Estimated LNAPL about 1.000 m³ </li></ul></ul></ul><ul><ul><ul><li>Area with LNAPL about 23.000 m² </li></ul></ul></ul><ul><ul><ul><li>Thickness LNAPL > 1 meter </li></ul></ul></ul><ul><ul><ul><li>Hugh contamination of soil and groundwater </li></ul></ul></ul><ul><ul><ul><li>Shallow and deep LNAPL </li></ul></ul></ul>
  • 8. Surface area LNAPL
  • 9. Cross section LNAPL
  • 10. Brief description tender Tender <ul><ul><ul><li>Limited tendering started in 1999 </li></ul></ul></ul><ul><ul><ul><li>Two principals </li></ul></ul></ul><ul><ul><ul><li>Open tender, consultants did not know a good remediation </li></ul></ul></ul><ul><ul><ul><ul><li>approach (Design & Construct) </li></ul></ul></ul></ul><ul><ul><ul><li>Air and groundwater treatment must be able to treat also other </li></ul></ul></ul><ul><ul><ul><ul><li>gas and water of the customer </li></ul></ul></ul></ul><ul><ul><ul><li>Existing buildings and equipment must remain in function </li></ul></ul></ul><ul><ul><ul><li>High demands on safety (ATEX) and operation </li></ul></ul></ul><ul><ul><ul><li>Design, negotiations and safety aspects took 1,5 year </li></ul></ul></ul>
  • 11. <ul><ul><li>Design Remediation System: </li></ul></ul><ul><ul><li>Multi Phase Extraction: </li></ul></ul><ul><ul><ul><ul><li>950 MPE-filters, two levels (2,5 – 3,5 and 3,5 – 4,5 mbgl), </li></ul></ul></ul></ul><ul><ul><li>Soil vapor and groundwater extraction: </li></ul></ul><ul><ul><ul><ul><li>25 combined filters for soil vapor- and groundwater extraction (6 mbgl) , </li></ul></ul></ul></ul><ul><ul><li>Deep groundwater extraction: </li></ul></ul><ul><ul><ul><ul><li>3 deepwells (15 mbgl), </li></ul></ul></ul></ul><ul><ul><li>Airsparging: </li></ul></ul><ul><ul><ul><ul><li>43 injection filters (6 mbgl), </li></ul></ul></ul></ul><ul><ul><li>about 35 km underground tubing! </li></ul></ul>Remediation system
  • 12. Remediation system Combined filter MPE shallow MPE deep Airsparging Original clay
  • 13. <ul><ul><li>Design Remediation Equipment: </li></ul></ul><ul><ul><li>Multi Phase Extraction </li></ul></ul><ul><ul><ul><ul><li>4 MFE-units, capacity 200 Nm 3 /hr, knock out pot to separate extracted water, LNAPL and soil vapor, </li></ul></ul></ul></ul><ul><ul><li>Groundwater extraction </li></ul></ul><ul><ul><ul><ul><li>Shallow: 2 Piston pumps, total capacity 10 m 3 /hr, </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Deep: 3 Piston pumps, total capacity 7,5 m 3 /hr, </li></ul></ul></ul></ul><ul><ul><li>Soil vapor extraction </li></ul></ul><ul><ul><ul><ul><li>Blower, capacity 450 Nm 3 /hr with knock out pot, </li></ul></ul></ul></ul><ul><ul><li>Airsparging </li></ul></ul><ul><ul><ul><ul><li>1 Compressor, capacity 200 Nm 3 /hr </li></ul></ul></ul></ul><ul><ul><ul><li>All installations ATEX </li></ul></ul></ul>Remediation Equipment
  • 14. Remediaton Equipment
  • 15. Water treatment <ul><li>Water and product treatment system : </li></ul><ul><li>Capacity 25 m³/hr, </li></ul><ul><li>2 Oil/water separators in sequence, </li></ul><ul><li>1 Product tank, </li></ul><ul><li>3 Stripping towers in sequence, </li></ul><ul><li>2 Rotating biological contactors, </li></ul><ul><li>1 Activated carbon vessel, </li></ul><ul><li>Sediment pond, </li></ul><ul><li>Discharge pump to public sewer system, </li></ul><ul><li>Water treatment also used for other water. </li></ul>
  • 16. Water treatment
  • 17. Air treatment <ul><li>Air treatment unit (6.500 m 3 /hr) : </li></ul><ul><li>Incinerator, capacity 100 kg product per hour, </li></ul><ul><li>Flow variable between 3.000 en 6.500 m 3 /hr, </li></ul><ul><li>Oxidation at a temperature of 720 degrees Celsius, gas-fired, </li></ul><ul><li>Heat exchanger to reduce gas consumption, </li></ul><ul><li>Treatment air from: </li></ul><ul><ul><li>MPE </li></ul></ul><ul><ul><li>Soil vapor extraction </li></ul></ul><ul><ul><li>2 Stripping towers </li></ul></ul>
  • 18. Air treatment
  • 19. Results and costs Results product removal <ul><li>Period 2001 – 2006: </li></ul><ul><ul><li>700 tons gas phase (MPE and SVE)  incinerator </li></ul></ul><ul><ul><li>310 tons liquid phase (oil; mainly MPE) </li></ul></ul><ul><ul><li>80% oil layer removed (surface) </li></ul></ul><ul><li>Period 2006 – 2008: </li></ul><ul><ul><li>225 tons gas phase </li></ul></ul><ul><ul><li>95% oil layer removed (surface) </li></ul></ul><ul><li>In 2008 focus changed from LNAPL removal to stimulation of biological degradation (airsparging and SVE), </li></ul><ul><li>Total costs from start till 2008 (LNAPL removal): </li></ul><ul><ul><li>€ 29,-/m 3 contaminated soil or </li></ul></ul><ul><ul><li>€ 3,-/liter removed product. </li></ul></ul>
  • 20. Deep LNAPL removal Hier 2 e dwarsdoorsnede van Marco invoegen
  • 21. Remediation approach deep LNAPL Tender and remediation approach <ul><li>Residual deep oil layer: 1.200 m 2 , 5 – 7 mbgl </li></ul><ul><li>All obstacles will be removed  new tanks </li></ul><ul><li>HMVT made an overview and cost estimate for all possible remediation approaches </li></ul><ul><li>Based on this overview the client decided to excavate the deep oil layer </li></ul><ul><li>Based on the cost estimate the 2 responsible principals made a deal about the costs </li></ul><ul><li>HMVT made a detailed design, including an alternative sheet pile </li></ul>
  • 22. Results and costs Results product removal <ul><li>Sheet pile: 190 m 1 / till 10 mbgl </li></ul><ul><li>Groundwater extraction: </li></ul><ul><ul><li>Deep and shallow, total 50 m 3 /hr </li></ul></ul><ul><ul><li>Treatment in existing and extra water treatment </li></ul></ul><ul><li>Excavation: </li></ul><ul><ul><li>Excavation 15.100 m 3 ground, </li></ul></ul><ul><ul><li>4.122 tons polluted ground treated </li></ul></ul><ul><li>The work was performed within the timetable </li></ul><ul><li>Cost saving: € 130.000 for the client </li></ul>
  • 23. Deep LNAPL removal

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