Dye Test Inspection for Submarine Outfalls
Dye Test Inspection for Submarine Outfalls
Submarine outfalls are used for discharging treated sewage from DSD sewage treatment plants into the sea. These submarine outfalls are located in various water areas across Hong Kong.
Each year, every submarine outfall is scheduled to be tested once to ensure the integrity of the submarine outfalls for discharging effluent from the DSD sewage treatment plants. The dye test would generate a fluorescent green colour patch at the observed area, and it is the result of testing as the green dye emerges from the submarine outfall.
The dye used is a non-toxic dye and is harmless to the marine environment. The tidal current will disperse it rapidly.
Schedule of Dye Test Inspection of Submarine Outfalls
|
Position |
Location |
Date of test |
Expected time of observation of dye at outfall point |
|
1 |
Mui Wo STW |
14-Apr-2026 |
10:30 - 11:00 |
|
2 |
Peng Chau STW |
15-Apr-2026 |
10:30 - 11:00 |
|
3 |
Yung Shue Wan STW |
28-Apr-2026 |
10:30 - 11:00 |
|
4 |
Sok Kwu Wan STW |
29-Apr-2026 |
10:30 - 11:00 |
|
5 |
Tai O Imhoff Tank |
30-Apr-2026 |
15:00 - 15:30 |
|
6 |
Siu Ho Wan STW |
30-Apr-2026 |
15:30 - 16:00 |
Outfalls Location 14-30 April 2026 Schedule
Outfalls Location on 30 April 2026 Schedule (Tai O Imhoff Tank)