Welcome to CE488 Environmental Geotechnics Lecture #9: Sustainable Development with Dredged Sediments Department of Civil Engineering IIT Bombay
Po Ports Port of Rotterdam, Netherlands
Layout of JNPT, Mumbai
Ai Airport rports Artificial Island Chek Lap Kok, Hong Kong Kansai Airport, Japan
Artificial Islands Construction of Palm Group of Islands, Dubai
“Dredging”
What is dredging? “Under water excavation” • Need for Dredging • Maintenance/creation of navigable depth in channels and berths • In rivers to avoid flooding. • Lake restoration projects • Desiltation of water treatment plans
Dr Dredgi edging ng activity activity • Pre ‐ Survey • Drilling and Blasting • Dredging • Types of Dredgers Materials • Trailing Suction Hopper Dredger sand/silt/soft clays. • Cutter Suction Dredger medium ‐ stiff clay/soft rocks. • Back ‐ hoe Dredger usually used to dredge out rocks. • Post ‐ Survey
Dredged Sediments
Depleting natural What is the need Cost of disposal resource for utilization? SUSTAINABILITY 10
Steps in Utilization Characterization Utilization Challenges Solutions • Infrastructure sector • Agriculture activities • Habitat restoration Issues in utilization? • Beach replenishment 11
Strength and durability Policies on Handling and beneficial storage usage ISSUES Vulnerability Contamination to microbial (organic and attack Inorganic) 12
Re Remediation • Physical Separation & Mechanical Process • Density separation • Filter ‐ press methods • Thermal Process • Incineration • Chemical process • Chelant Extraction • Electro ‐ kinetic remediation • Bio ‐ remediation • Use of reducing/oxidizing bacteria
Ty Typical dr dredged edged mater material als and and their their bene benefi fici cial al uses… uses… Table Source: USEPA Manual on ‘Beneficial Use of Dredge Material’
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