EPD - Pollution Problems & Practical Solutions

Marine Dredging and Filling
Pollution Type
Water
Problem
Dispersion of sediment
Relevant Env. Control Under the Dumping at Sea Ordinance, Cap. 466, anyone involved in marine dumping and related loading operations, requires a permit from the EPD.
Practical Solutions
Apply dumping permit from the EPD before marine dumping and related loading operations
Equip all dumping vessels with an automatic self-monitoring system which records their position and loading and dumping operations
Use tightly closed grabs during dredging to restrict the loss of fine sediment to suspension
Handle the dredged material with care to avoid splashing into surrounding waters during loading
Use silt curtain to screen the marine works to control sediment suspension. The silt curtain should be fabricated from permeable, durable, abrasion resistant membrane like geotextiles and be mounted on a floating boom structure surrounding the grab and should extend to the sea bottom
Use tug boat and winch for positioning of work barge to avoid stirring up of sediment by thrusters at shallow area
Tightly closed dredging grab to avoid loss of sediment
Tightly closed dredging grab to avoid loss of sediment
 
Silt curtain hanged on closed metal frame to confine the suspension of sediment from marine dredging work
Silt curtain hanged on closed metal frame to confine the suspension of sediment from marine dredging work
 
Silt curtain to screen the cooling water intake of air conditioning system
Silt curtain to screen the cooling water intake of air conditioning system