Oskarshamn harbour - The environmental problem As Cd Cu Pb Zn.and dioxins 2011-06-17 Hifab AB 1
Concentration of dioxins in sediments (ng TEQ/kg TS) <100 SAFT NIFE AB 100-300 100-200 <100 Färjeterminal 100-300 100-1000 100-1000 500-3000 F d Kopparverket 2011-06-17 15 Structor Miljö, Göteborg 100-300 2
Contaminants in sediments Mean values (mg/kg TS) (dioxins ng/kg TS) Inre hamnbassängen Yttre hamnbassängen Småbåtshamnen NV Höga halter/mkt höga halter Arsenik 170 110 100 30 150 Kadmium 16 10 16 7 35 Koppar 1 300 1 400 1 400 100 500 Kvicksilver 2,3 1,0 2,0 1 5 Nickel 71 25 50 50 250 Bly 900 800 500 400 2000 Zink 2 900 3 300 2 700 1000 5000 Dioxiner 400 130 150 21 1) 100 2) PCB7 0,1 0,03 0,1 0,004 0,02 TBT 600 100 500 100 3) 500 3) 2011-06-17 Hifab AB 3
IN Typical turnover 50 m 3 /s Variations depending on wind direction wind speed UT 2010-10-05 4
Annual discharge from the sediments to the Baltic Sea Zink 700 kg Koppar 800 kg Bly 200 kg Cd 20 kg Dioxiner 0,1 0,3 g Corresponds to Emån. The total discharge from the Swedish industry is about 2 g/år 2011-06-17 5 Structor Miljö, Göteborg
Remediation scenarios Dredging of the inner harbour basin with the aim to reduce the discharge of contaminats from the harbour with at least 90 % Amount of contaminated sediments included in this dredging 500 000 m 3 Further dredging in the outer basin will reduce the amount of contaminants, but does not affect today s discharge. 2010-01-27 Hifab AB 6
Disposal of contaminated sediments Stabilization and utilization in the harbour, as fill material for construction of new areas. Alternatives: Disposal in a local landfill in Oskarshamn. Disposal at external facilities (commercial). 2010-01-27 Hifab AB 7
Vad ska göras Possible areas for utilization Grimskallen Oljehamnen Rävsmålan 2011-06-17 Hifab AB 8
Water depth in Oskarshamn harbour 2011-06-17 Hifab AB 9
Contaminated Sediment Thickness Yttre Inre V. Rävsmålan Ö Rävsmålan Månskensviken 2011-06-17 Hifab AB 10
Vilka alternativ Sediment för sanering properties har föreslagits? and variability Vad blir kostnaden? DS % W n % LOI % TOC % Max: 82 22 34 13,2 Median: 27 270 14 4,9 Mean: 30 233 14 4,8 Min: 13 669 0.6 1,0 Population: Stddev: 741 13,3 741 7,5 76 2,0 2011-06-17 Hifab AB 11
Vilka alternativ Sediment för sanering properties har föreslagits? pooled samples Vad blir kostnaden? Density t/m 3 W n % LOI (550ºC) % c u * kpa Inre 1.25 203 10 <1 V. Rävsm. 1,17 339 17 <1 Ö. Rävsm. 1,28 211 7,7 <1 Månskensv. 1.24 246 8,8 <1 Yttre 1,14 478 7,7 <1 *Disturbed shear strength 2011-06-17 Hifab AB 12
Grain size distribution 30-60 % clay 30-50 % silt 0-30 % sand 2011-06-17 Hifab AB 13
Stabilization results (laboratory) Månskensviken (w n =246 %) Binders: Cement Merit (ground granulated blast furnace slag) Shear strength kpa Days after mixing 2011-06-17 Hifab AB 14
Before stabilization After stabilization Deformation characteristics 2011-06-17 Hifab AB 15
Leaching properties trace elements (EN 12457-3) Bindemedel: C/M 70/30-100 C/M 30/70-150 C/M 70/30-150 C/M 70/30-200 Ostabiliserat NV Handbok 2010:1 Provplats Månskensviken Månskensviken Månskensviken Månskensviken Månskensviken Återvinning avfall NFS 2004:10 Deponikriterier Prov BL2 35d L/S10 BL3 35d L/S10 BL4 35d L/S10 BL7 34d L/S10 Sediment L/S10 Mindre än ringa risk Inert IFA As mg/kg TS 0,17 0,15 0,12 0,055 0,4 0,09 0,5 2 Ba mg/kg TS 0,97 0,6 1,7 2,1 0,64 20 100 Cd mg/kg TS <0,0007 <0,0007 <0,0006 <0,0005 <0,0006 0,02 0,04 1 Cr mg/kg TS <0,006 <0,006 <0,006 <0,005 <0,0006 1 0,5 10 Cu mg/kg TS <0,02 <0,02 <0,02 <0,01 <0,02 0,8 2 50 Hg mg/kg TS 0,0037 0,002 0,0037 0,0043 <0,0003 0,01 0,01 0,2 Mo mg/kg TS 2,3 2,4 1,5 1,3 0,51-0,5 10 Ni mg/kg TS 1 0,8 1 1,6 0,058 0,4 0,4 10 Pb mg/kg TS <0,003 0,0032 <0,003 <0,002 0,0058 0,2 0,5 10 Se mg/kg TS 0,22 0,64 0,49 0,59 0,024-0,1 0,5 Zn mg/kg TS 0,022 0,021 <0,03 0,020 0,047 4 4 50 2011-06-17 Hifab AB 16
Leaching properties organic contaminants (only unstabilized sediments) Leachate concentration after filtration (ng/l) Leachate concentration after centrifugation (ng/l) Dioxins 0,008 2,2 PCB 7 23 150 Organic tin 9,4 300 2011-06-17 Hifab AB 17
Embankments for confining dredged sediments 2011-06-17 Hifab AB 18
Principal design of embankments Erosion protection Graded filter Overlay Embankment - blasted rock Stabilised dredged sediments 2011-06-17 Hifab AB 19
Results from hydrogeological modelling Infiltration calculated at 3-20 mm/year, i.e. 0,5-3 % of the annual precipitation (K sediments = 1*10-8 m/s) 2010-01-27 Hifab AB 20
Future discharge? Ämne Uppmätt halt i lakvatten* Beräknad maximal spridning Metaller µg/l g/år Arsenik 17-40 20 Bly <0,2-0,58 0,3 Kadmium <0,07 0,04 Koppar 2 1 Nickel 6-160 80 Zink 2-5 2,5 Organiska ämnen (ng/l) (mg/år) Dioxiner 0,005 2,2 1,1 PCB7 0-150 75 TBT 9-300 150 2010-01-27 Hifab AB 21