NAPL Site Remediation (HMVT)


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NAPL Site Remediation (HMVT)

  1. 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. 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. 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. 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. 5. Site LNAPL
  6. 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. 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. 8. Surface area LNAPL
  9. 9. Cross section LNAPL
  10. 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. 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. 12. Remediation system Combined filter MPE shallow MPE deep Airsparging Original clay
  13. 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. 14. Remediaton Equipment
  15. 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. 16. Water treatment
  17. 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. 18. Air treatment
  19. 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. 20. Deep LNAPL removal Hier 2 e dwarsdoorsnede van Marco invoegen
  21. 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. 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. 23. Deep LNAPL removal