Case stories- Utilisation of dredged sludge Pansio / Aurajoki Turku Execution of dredging works

Transcription

1 Case stories- Utilisation of dredged sludge Pansio / Aurajoki Turku Execution of dredging works Tapio Leinonen

2 Presentation content Life-project basic information Targets for the Life project Main tasks Project organisation of parties Dredging works Dredging techniques Other dredging methods 2

3 LIFE06 ENV/FIN/ PROJECT NAME Controlled Treatment of TBT- Contaminated Dredged Sediments for the Beneficial Use in Infrastructure Applications. Case: Aurajoki Turku, Finland STABLE 3

4 Basic information First application in November 2004 Project awarded in spring 2006 Time schedule Application process was complicated and time consuming Good arguments needed and they are judged in EU level Budget 3,7 M, EU contribution 0,98 M 4

5 Main targets for the project The target of the project is to develop new environmentally friendly and cost effective stabilisation method for contaminated soil Method is called process stabilisation This kind of method is not known in EU Stabilized dredging masses will be utilized in Pansio harbour as harbour field structures Project target areas are Pansio and river Aurajoki 5

6 Direct target group for the project Turku harbour has the same tbtproblem as many other harbours They want to solve tbt-problem in sophisticated way European organisations dealing with the sediments, european view is very important in EU finaced projects 6

7 Main advantages Less environmental risks due to the fact that no unprocessed sediment into basin More homogenous material due to better mixture Less bibder needed Lower costs? 7

8 Main tasks of Life project Determination of binder recipes Devolopment of process stabilisation method, testing, management and control Life-Cycle assessment Dissemination Management and reporting 8

9 PROJECT ORGANISATION Project organisation STEERING GROUP TERRAMARE OY (Beneficiary) -Mr Jarmo Yletyinen (Co-ordinator) -Mr Tapio Leinonen (Project manager -Mr Seppo Ajanko (Works manager) HYVINKÄÄN TIELUISKA OY (Partner) BIOMAA OY ( ) - Mr Valto Tikkanen - Niko Tikkanen - Ville Niutanen COUNCIL OF SOUTH-EAST FINLAND (Partner) - Mr Eero Löytönen T A S K G R O U PS T E C H N I C A L FORTUM POWER AND HEAT OYJ (Partner) - Mr Antto Kulla G R O U PS PORT OF TURKU (Co-finacier) - Mr Matti J. Niemi RAMBOLL FINLAND OY (External asisstant) - Dr Pentti Lahtinen (- Dr Ville Niutanen) ENVIRONMENTAL CENTRE OF SOUTH- EAST FINLAND (Specialist member) - Mrs Marja-Terttu Parsama 9

10 Life project parties 1/5 FORTUM POWER AND HEAT OY Leading energy company in Scandinavia and Baltic sea area Main products electricity, heat and steam Side products tons of fly ash of which 50% for the beneficial use Search market for fly ash 10

11 Life project parties 2/5 BIOMAA OY Biomaa Oy was founded in 1994 operations in contaminated land remediation and wood fuel crushing, mass stabilisation Main developer of process stabilisation 11

12 Life project parties 3/5 COUNCIL OF SOUTH-WEST FINLAND One of regional councils in Finland Experience about many EU projects Responsible of publicity and dissemination of the project (Webpages, videos etc.) Expert and assessor 12

13 Life project parties 4/5 TURKU HARBOUR Important western harbour Fighting with the tbt-problems Wants to be development orientated organisation Co financer of the project 13

14 Life project parties 5/5 TERRAMARE Leading dredging and harbour construction contractor in Nordic Countries Developed environmental dredging technology since 2002 More that 10 environmental dredging projects during last years Tbt-contractor in Vuosaari 14

15 Dredging, main plant First pilot on Pansio military harbour in Backhoe dredger Marika + environmental grab Barges Adam ja David Second phase Grab dredger Kahmari + environmental grab Barges Ada5 and Ada6 15

16 Quantities First pilot on Pansio military harbour in Dredging of Tbt-contaminated material uring environmental grab quantity m3 Second phase in in river Aurajoki Dredging of Tbt-contaminated material using environmental grab quantity app m3 16

17 Environmental grab Controlled Sediment Removal: Crane Monitoring System (CMS) / CPM and Horizontal Profiling Grab (HPG) 17

18 Controlled by RTK-GPS, centimeter-level precision in X, Y, Z planes, real-time feedback for operator, data logging HPG is placed into the sediment (unlike cable rig buckets), and closes on true horizontal plane. Excavate in patterns of overlapping rectangles, no squeezing out of sediments. Proven minimal turbidity, spillage Environmental grab Key Features of CMS and HPG Debris handling Tapio Leinonen 18

19 Environmental grab 19

20 Environmental grab CMS + HGP Equipment proven over ten years of service Mounted on hydraulic excavator for greater precision Assures removal of contaminated sediment while minimizing overdredging Minimal mixing of water compared to pumping process 20

21 Accurancy in dredging Accuracy = Substantial Cost Savings 10 cm of unnecessary overdredge over 100 hectares equates to 100,000 m3 Reduction of Disposal Volume = Significant Cost Savings 21

22 Other dredging methods Backhoe bucket with closing mechanism Disk Cutter Cutter suction dredger 22

23 Questions Any questions? 23