WODCON XXI, June 2016, Miami, Florida Some Proven Benefits of Polymer Use in the Treatment of Sediments in Recent Dredging Projects
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1 , June 2016, Miami, Florida Some Proven Benefits of Polymer Use in the Treatment of Sediments in Recent Dredging Projects by Alexis Boisson and Francois Couturier, SNF, France
2 Agenda Introduction Coagulation and flocculation basics Port La Foret harbour (France) case study Kishon river (Israel) case study Conclusion Questions and Answers
3 2000 strong increase in polymer usage in dredging Better Faster Smaller strong increasewith in polymer usage except in dredging 1964 First case of dredging polymers A brief history of polymer use in the dredging industry
4 Water Use of polyelectrolytes Oil & Gas Mining Agriculture Paper Textile Cosmetics
5 What are Polyeclectrolytes?
6 What do polyelectrolytes do?
7 Destabilisation of the constituents of a given water Coagulation Stable colloids Unstable colloids Micro flocs formation /- /- /- /- /- /- /- /- /- /-
8 Collection into aggregates Flocculation Micro flocs and unstable colloids Bridging effect Flocs formation
9 Stokes Law Particle diameter mm µm Type of particle Settling time through 1m of water Gravel 1 second Sand 10 seconds Fine sand 2 minutes Clay 2 hours Bacteria 8 days Colloid 2 years Colloid 10 years Colloid 200 years
10 On site Laboratory Selection Test Parameters variability of dredged sediments type of dewatering equipment type of water and equipment for polymer preparation environmental aspects Jar Test
11 Port-La-Forêt Harbour Port-La-Forêt Harbour Location Lake Harbour River Dewatering process Centrifuge Dry stacking Filter press Geotextile tubes Ponds Benefits Saving land surface Saving environment Saving time Saving money
12 Overview of the Project Port-La-Forêt Harbour Date: 2013 Location: Brittany, France Sediment volume: m 3 Sediment data: slightly polluted (paint residues) Key players: - Port authorities (SAEM SODEFY) - Port-La-Forêt municipality - Environmental agency (DREAL, Police de l eau) Others: no harbour maintenance for several years
13 Overview of the Project Dredging Sediment transport Dewatering Released water control Port-La-Forêt Harbour Polymer preparation Turbidity measurement 4 km
14 Overview of the Project Dredging Sediment transport Dewatering Released water control Port-La-Forêt Harbour Polymer preparation Turbidity measurement 4 km
15 Overview of the Project: Dredging Sediment transport Dewatering Released water control Port-La-Forêt Harbour Polymer preparation Turbidity measurement 4 km
16
17 Overview of the Project Dredging Sediment transport Dewatering Released water control Port-La-Forêt Harbour Polymer preparation Turbidity measurement 4 km Polymer injection point Sampling point
18 Overview of the Project Dredging Sediment transport Dewatering Released water control Port-La-Forêt Harbour Polymer preparation Turbidity measurement 4 km Retention area Low point
19 Project Review Port-La-Forêt Harbour Key points: Duration: 6 months Dredged sediments: m 3 Flocculant: high cationic branched polymer Polymer consumption 15 metric tonnes Project benefits: Increasing harbour level for harbour boaters Removing contaminated sediment to a safe area Saving use of turnround of around 3000 trucks
20 Kishon River Kishon River Location Lake Harbour River Dewatering process Centrifuge Dry stacking Filter press Geotextile tubes Ponds Benefits Saving land surface Saving environment Saving time Saving money
21 Overview of the Project Kishon River Date: Location: Haifa, Israel Sediment volume: m 3 Sediment data: strong pollution (Heavy metals, hydrocarbons, ) Key players: - Israeli governement - Kishon river and Drainage Authority - Water Authority - Manufacturers Association - Environmental umbrella organization (Life and Environment) - Local Authorities Others: cleaning 7 kilometers downstream
22 Process Description Kishon River Polymer preparation Polymer Preparation Unit
23 Project Review Kishon River Key points Duration 28 months Dredged sediments m 3 Flocculant Very high Molecular Weight, medium anionic linear polymer Polymer consumption around 120 t Project benefits Revitalization of the river Flood prevention Sediment depollution
24 Solid-liquid separation is the main benefit of polymers in these case studies Conclusion Other proven benefits Decrease of pumping cost for long distance transportation of mineral particles in water Low-cost technique for the treatment of mature fine tailings in Canadian oil sands Accelerated drainage for higher machine running rates in paper industry Decrease of pumping pressure in fracking jobs Reduction of cake solids amount in municipal water treatment Higher storage capability in mine tailing ponds
25 In 2016 not all polymer benefits have been transferred to the dredging industry Conclusion Polymer use is increasing with more and more sediment sent for inland treatment Geotextile tubes have a good balance between water quality-cost-ease of use-drying time
26 SNF in Riceboro Georgia 35 years of production and service
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