Technical Visit to Stonecutters Island Sewage Treatment Works

Technical Visit to Stonecutters Island Sewage Treatment Works

Occupying 10 hectares of reclaimed land, Stonecutters Island Sewage Treatment Works (SCISTW), is a chemically enhanced primary treatment works with design flow of 2,450,000 cubic meters per day, equivalent to the volume of about 1,000 Olympic-size swimming pools. It is one of the largest and most compact sewage treatment works of its type in the world and also forms an important part of the Harbour Area Treatment Scheme (HATS).

On 22 June 2026 10 participants had joint technical visit to Stonecutters Island Sewage Treatment Plant. We assembled at Lai Chi Kok MTR station and took 44M minibus directly to Stonecutters Island Sewage Treatment Plant.

Before the tour, we were led to a meeting room with PowerPoint and video to give a breif introduction of drainage Service Departyment and treatment plants.
Drainage Service Department had two main function:

The sewage network runs 1800km and can handle 2.8-2.9 million meter cubes of sewerage.  
The sewage treatment facilities have the following types:

1. Preliminnary treatment
2. Primary treatment / Chemical enhanced primary treatment
3. Secondary treatment
4. Tertiary treatment

Stonecutters Island Sewage Treatment Plant was in operation in 2001 focusing chemical enhanced primary treatment serving 5.7 million people around the Victoria Harbour. Currently it is handling 1.93 million cubic meter of sewage and 639 tons of sludge per day.

After the presentation, we were to rooftop to have a closer look at the plant. We had group photo and souvenir presentation at the roomtop.
We took another group photo before leaving the plant. Everyone had a good experience in this visit.