Virtual Tutorial

Options for Mitigating Wastewater Discharges

• Water conservation, effluent reuse
  
• Improve quality of effluent by anchoring treatment levels
  
• Re-site outfall
  
• Redesign diffusers for greater initial dilution
  
• Advance extension of outfall from embayed water (reclamation construction)
  
• Suppress foam formation (thermal discharge)
  
• Use suitable aeration devices to oxygenate the treated effluent
  
• Use environmentally friendly chemicals for water, wastewater and cooling water treatment

Options for Mitigating Reclamation/Dredging Impacts

• Re-sequence works to avoid overlapping between concurrent activities
  
• Reduce dredging rate
  
• Use alternative dredging methods, e.g. grab dredging vs trailer dredging
  
• Reduce filling rate
  
• Use alternative filling method
  
• Use silt curtains/screens
  
• Avoid dredging, particularly contaminated sediment (leave marine sediment in-situ)
  
• Use close grab dredger

Reclamation phasing to minimise suspended sediments

[Photo]

Silt Curtain installed for and during dredging

[Photo]

Dredging in Motion

[Video]