In 2013-14, the successful commissioning of various projects and steady progress of Harbour Area Treatment Scheme (HATS) Stage 2A, have made the year a remarkable one for DSD. With the staff’s full dedication, DSD has overcome every challenge encountered and is always ready for the future challenges.
We continued to serve the public with high quality services and have received a number of awards during the year. We are most honoured to share with you the year’s highlights in this chapter.
Harbour Area Treatment Scheme Stage 2A
The Harbour Area Treatment Scheme (HATS) aims to improve the water quality of Victoria Harbour by collecting and treating sewage generated from both sides of the Harbour prior to its discharge. HATS consists of two stages with Stage 1 commissioned in December 2001 and Stage 2A in progress. In 2013-14, we have made steady progress for Stage 2A’s following three major parts:
- upgrading works for the Stonecutters Island Sewage Treatment Works (SCISTW);
- upgrading works for eight existing preliminary treatment works (PTW); and
- construction of the sewage conveyance system.
HATS Stage 2A’s 21-kilometres sewage conveyance system, with maximum depth at 160 metres below sea level, is one of the deepest sewage tunnels in the world. The tunnel section between North Point and Wan Chai East (approximately 3.2 kilometres), and that between Aberdeen and Sai Ying Pun (approximately 7.5 kilometres), both constructed by drill-and-blast method, were successfully broken through by in end-2013. Whereas for the two smaller diameter tunnel sections between Ap Lei Chau and Aberdeen (approximately 1.3 kilometres in total) constructed by horizontal directional drilling, all the pipe pulling works were completed in March 2014.
HATS Stage 2A’s main works are targeted for completion by 2014-15. The testing and commissioning of the whole project will commence in early 2015 and will take about six months to complete.
Commissioning of Kowloon Bay Sewage Interception Station
Stormwater from Kowloon Bay, Ngau Tau Kok and Jordan Valley is discharged into Kai Tak Approach Channel through the Jordan Valley Box Culvert. However, due to expedient connections and mal-practice of discharging polluted water into roadside gullies, the flow in Jordan Valley Box Culvert is heavily polluted, contributing to poor water quality and odour nuisance at the Kai Tak Approach Channel. To alleviate the problems, we intercept and divert the polluted flow in Jordan Valley Box Culvert to an existing trunk sewer along Kai Fuk Road. Kowloon Bay Sewage Interception Station which is the first large scale automatic flow interception facility in Hong Kong has been commissioned since June 2013. Its penstocks are controlled by an automated control system according to the weather signals received from the Hong Kong Observatory so as to enhance interception efficiency.
DSD Research & Development Forum 2013
Since 2006, DSD has hosted the R&D Forum every year to foster collaboration within the water sector and promote innovations in sustainable drainage and sewerage systems. DSD R&D Forum 2013 took place at the Hong Kong Central Library and comprises four half-day sessions on following topics:
(i) Sustainable Drainage (20 November);
(ii) New Engineering Contract (28 November);
(iii) Greening (3 December); and
(iv) Wastewater Treatment (5 December).