Dredged Material Treatment and Disposal Facilities

Transcription

1 Dredged Material Treatment and Disposal Facilities SedNet Special Session: Managing the Elbe Estuary 9 th October 2009

2 Dredged Material Management ELBE E L B E Avoidance Dredging Service Harbour Treatment Dewatering Fields Disposal Francop Relocation METHA JV Feldhofe Effluent Sand and Sealingmaterial Ceramic Products Beneficial Use 2

3 Sites for Dredged Material Treatment METHA Treatment Facility Disposal Site 3

4 Why Need We Dredged Material Separation? Cadmium Copper Lead in % 50 in % 50 in % d in µm d in µm d in µm 4

5 Treatment Dewatering Fields Moorburg 5

6 Operation Principle of the Dewatering Fields Silt Suspension Drainage Pipes Silt Sealing Settled Silt Area size of dewatering fields: about 100 ha Field size: 2-4 ha Annual throughput: m³ m Transport to the Silt Deposit 6

7 Operation of the Dewatering Fields Handling of the material in the beginning of the process Dewatered Material ready for beneficial use or disposal 7

8 Treatment METHA Plant 8

9 Principle Flowsheet of the METHA Plant - Sorting and Separation Dredged Material Cutter with pre-screening Hydro cyclones (63 µm m stage) Hydro-cyclones (20 µm m stage) Stock basin Rotary screen (10 mm) Upstream current classifier Sand Dewatering screen Spirals Vacuum dewatering belt Coarse fraction Sand Fine sand 9

10 Main Components of the METHA Plant - Sorting and Separation Hydro- cyclone (20 µm) Rotary screen (10 mm) Spirals Upstream current classifier Hydro-cyclones (63 µm) 10

11 Principle Flowsheet of the METHA Plant - Dewatering Thickener Agitated stock tank Waste water Treatment Dewatering Membrane chamber filter press Dewatering 1st stage Screen belt press Dewatering 2nd stage High pressure belt press Silt 11

12 Main Components of the METHA Plant - Dewatering Filter belt press Membrane chamber filter press High pressure belt press 12

13 Facts and Figures of the METHA Plant Development of the technology: Commissioning: March 1993 Annual throughput: about m³ m t DS Investment costs: about (1993) Operation costs: about /a Staff: 96 employees /a (Process) /a (Staff) /a (Depreciation & Debt Services) Until today the METHA plant is the largest dredged material treatment plant worldwide 13

14 Sites for Dredged Material Treatment METHA Treatment Facility Disposal Site 14

15 Disposal Francop Disposal Site Area size: about 100 ha Total capacity: m³ m Annual capacity: m³ m Installation Operation: until 2013 Continued use: Public Park

16 Disposal Feldhofe Disposal Site Area size: about 80 ha Total capacity: m³ m Annual capacity: m³ m Installation Operation: until 2025 Continued use: Public Park

17 Construction Principle - Francop Disposal Site Alternating Layers of Silt and Sand Surface Sealing and Cover System Base Sealing Intermediate Sealing 38 m Edge Support Old Flushing Field Clay 500 m 17

18 Construction Principle - Francop Disposal Site Edge Support Structure with Drainage System Control Shaft with Circle Pipeline Drainage Layer Shaft Edge Support 18

19 Construction Principle - Francop Disposal Site Surface Cover System Cultivable Soil Drainage Layer Upper Sealing (3 Layers of Silt) m Base Sealing Drainage Layers 0,6 2,1 m HDPE-Liner 2,5 mm Base Sealing ( 3 Layers of Silt) 19

20 Disposal Monitoring Program Vegetation Noise Gas Dust Ground Water 20

21 Dredged Material - Beneficial Use Refilling of harbour basins Leight weight pellets Bricks Dike construction 21

22 Thank you for your attention! Contacts HPA Hamburg Port Authority AöRA Neuer Wandrahm Hamburg port-authority.de Tel.: Heinz-Dieter.Detzner@hpa.hamburg.de 22