Coastal Marine Environment Sustainability - Sustainable Practices in Geoenvironmental Engineering - page 290

TABLE 8.4 (Continued)
Various Techniques Developed for Remediation of Contaminated Seawater and Sediments

Technology Name Feature Example of Use Economics Durability Maintenance Comments

In situ
solidiication

Solidiication of seabed Established Expensive

Dredging and
disposal

Removal of contaminants Many examples $300/m 3 Disposal using

bags

Trench Collection of mud in trench

with about 2 m depth

Needs
experience

Inluenced by
waves

Removal of
sediments

Need disposal
sites

Capping of
sand

Capping of sand Many examples Easy task

with a
simple
machine

Not for
navigation route
of ships

Artiicial tidal
land

Sand beach Many examples Lack of

sand
materials

Inluenced by
waves

Lime strewing Adsorption of sulide

Increase in pH

Many examples Short term Strew often

when no
effects are
observed

Phyto-
remediation

Heavy metals, TBT, etc. Developing

Need seawater
puriication

Creation of Ecosystem
Artiicial wet
lands

Biological diversity Many examples High cost Dificulty in

evaluation

Seagrass Biological diversity, Increase

in haul of ish and shellish

Tidal pool Recreation in seaside Easy

Artiicial coral
reef

Biological diversity

Artiicial ish
compartment

Biological diversity, Increase in
haul of ish and shellish