Nurturing the Young –

Innovation for Sustainability

Events and Activities

Technical Visit to HATS Stage 2A Projects - Upgrading of Stonecutters Island Sewage Treatment Works (Contract Nos. DC/2009/10 & DC/2009/18)

Date, time & venue 
2013-03-09;9:00 am. – 12:00noon;Exit A1 of MTR Cheung Sha Wan Station (Please see attached map)


Programme Highlights

The two HATS Stage 2A projects at Stonecutters Island involve construction of s sewage pump station of an internal diameter of 55m which claimed to be the largest sewage pumping station in Asia, an extension to chemically enhanced primary treatment (CEPT) tanks, an effluent tunnel with drop and riser shafts using drill and blast method, and disinfection facilities.


Although the site visit will be restricted to ground level, attendees will have an opportunity to gain an insight into the construction of the main pumping station, the CEPT tanks extension and the shafts for the effluent tunnel and associated treatment facilities.



Free of charge


Registration & Enquiries

The number of participants is limited to 30 on a first-come first-served basis with priorities given to members of HKIE Civil Division. Please visit the HKIE website for online registration which will be activated at 9:00pm 25 February 2013.


At 1:00pm 26 February 2013, the number of applicants exceeded the capacity. On-line registration was CLOSED.


Only successful applicants will be informed on or before 7 March 2013.


For enquiries, please contact Ir. Ian Chung / Ms. Jenny Chui at Tel: 3922 9845 or Email:





By Ir Victoria Chan


Civil Division organized a technical visit to the Stonecutters Island Sewage Treatment Works (SCISTW) on 9 March 2013.

The SCISTW are upgraded to cope with the increased sewage flow due to population growth and future development of the HATS catchment.  The scope of the upgrading works involve the provision of a new main pumping station at SCISTW, expansion of chemically enhanced primary treatment (CEPT) facilities, construction of 880m long effluent tunnel on Stonecutters Island, and upgrading of associated deodorization and sludge treatment facilities.

The visit started with an informative presentation by Ir Priscilla Huong and Ir. Ronald Li, Resident Engineer of Contract Nos. DC/2009/10 & DC/2009/18 respectively introducing the typical blasting cycle adopted for the construction of effluent tunnel, highlighting the control measures on vibration, air overpressure (AOP) and flyrock from blasting, as well as the installation of noise enclosure. The second half of the presentation explained the construction of a new main pumping station for lifting up the sewage from deep tunnels to the sedimentation tank at surface housed within the main pumping station, as well as the extension of CEPT tanks to cope with the increased sewage flow.  A tunnel would be built to interconnect the new and existing main pumping stations allowing flow to be diverted if needed to enhance the reliability of these pumping stations.  The new pumping station, with internal diameter of 55m, is the largest sewage pumping station in Asia and it involves massive excavation within a diagram wall.

After the presentation and safety induction, the participants were then led to the construction site and had the opportunities to gain insights on the site operation and construction, including the drop shaft of the effluent tunnel, the main pumping station, CEPT tanks, etc.  A Q&A was held after the site visit and the site supervision teams share their valuable experience, in particular the safety importance in the blasting works.

Finally, we, on behalf of HKIE and the participants, would like to express our sincere thanks to Drainage Services Department (DSD) and Arup for their kind arrangement, their informative presentations and guidedsite visit, so that participants could have an in-depth understanding on the drill and blast construction and the upgrading works of the SCISTW under HATS Stage 2A Works.


Photographs of the Event

Please visit photo album "20130309 visit to HATS2A Stonecutter Sewage Treatment Works"

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