dredging 2012 the successful use of aquatic deposition for 450 000 m 3 contaminated sediments from...
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DredgingTRANSCRIPT
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Dredging 2012
THE SUCCESSFUL USE OF AQUATIC DEPOSITION FOR 450 000 M3 CONTAMINATED SEDIMENTS FROM OSLO HARBOR, Norway. Arne PettersenGijs D. BreedveldAmy M. P. OenEspen EekAnita Whitlock NybakkAudun Hauge
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Remedial solutions in Oslo, a combination of several methods
• Dredging• Deposition of dredged material in deep water
disposal facility • Capping of deep water disposal facility by
sand• Capping of seabed with clay and sand
– The 4 R’s
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Dredging
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photo by Viktor Jæger courtesy www.stopp-giftdumping.org
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Deep water disposal facility near Malmøykalven
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Placement of dredged material in deep water disposal facility at ~70 m water depth
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Capping material: 0-8 mm sand
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Capping of the deep water facility
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Placing the cap by reversing a Hopper
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Does the isolation cap work?
• Success criteria• Is the hole CAD area covered by
the required 0,4 m cap?• Is the cap mixed with the
underlying contaminated dredged material?
• The key is hands on control during construction
• Success criteria• Is the isolation cap clean?• Does the cap prevent
contaminant migration to the overlaying watercolumn?
• Is it tick enough to prevent animals from bioturbate into the dredged material? What is status on the recolonisation?
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SPI after first layer of cap
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Map based on SPI
Map based on multibeamecho sounder
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Geotechnical control after first layer of cap• Further capping in
layers to 0,4 m thickness is OK (safety factor of 2)
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Control by sediment corer
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Control by sediment corer
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Control by measuring rods
• On the basis of the conducted measurements of cap thickness it is concluded that the requirement of 0,4 m cap is met in the entire CAD.
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0
4
8
12
16
20
Deponi Nord for deponi Bekkelagsbasseng Utenfor tersklene
20052009
PAH (mg/kg)
Sediment quality in the CAD area (0-5 cm)Hg Cd Pb PAH-16 PCB-7 TBT
mg/kg mg/kg mg/kg mg/kg µg/kg µg/kgConsentration
Before establishing the CAD 0,80±0,49 1,39±0,97 94±50 3,58±1,38 28±20 112±92
After capping of CAD 0,03±0,03 0,06±0,06 5,2±2,7 0,30±0,58 < 18 2,4±2,5Change in sediment quality
Persent -96 % -95 % -94 % -92 % > -47 % -98 %Statistical signifikan Yes Yes Yes Yes No Yes
Cap quality
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Controlling the sediment to water flux of contaminants
• NGI flux chamber– Sits on seabed for ~2
months– SPMD membrane– Allow calculation of flux of
organic hydrophobic compounds
• Recommended reading: Espen Eek et. al “Field measurement of diffusional mass transfer of HOCs at the sediment-water interface”. Environ. Sci. Technol. (2010)
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Reduction in contaminant flux after the isolation capping of the CAD by 0,4 m sand
0
500
1000
1500
2000
2500
3000
PAH-16
Flux
(ng/
m2/
day)
0
20
40
60
80
100
PCB-7
Flux
s (n
g/m
2/da
y)
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Summary
• Deep water disposal facility is environmental efficient, especially when a contaminated area is used.
• Control during construction was important to achieve the required cap.
• For monitoring of effect, sufficient pre remedial data are important.
• Time series in monitoring after complete work to ensure the longtime effect.
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Thank you for your attention