Sustainable Development

The Relocation of the Shatin Sewage Treatment Works

In recent years, the HKSAR Government has started the DBO model, to conduct procurement of community infrastructure, allowing greater participation from private organisations in project operation. CSHK took the opportunity to form alliances with other companies and organised joint venture company bidding, to provide comprehensive one-stop services for detailed design, construction and future operation for infrastructure projects. This increases the cost effectiveness of the whole project and strives for higher adoption of innovative technologies in reforming construction standards, as well as speeding up the promotion of work plan, satisfying social demands.

Organic Resources Recovery Centre (Phase Ii)

Hong Kong disposes around 3,700 tonnes of organic waste every day, among which 1,000 tonnes come from the catering industry and food manufacturing and processing industry. Not only does it take up precious landfill space, but it also produces landfill gas and leachate, causing long term environmental burden. The O PARK 2 construction project has implemented the paper, “A Policy Framework for the Management of Municipal Solid Waste (2005–2014)”, published by the government, which sorts biodegradable waste and performs biological treatment, transforming them into useful resources.

The project is located at the former site of Sha Ling Livestock Waste Composting Plant at North District, covering 2.5 hectares, with an expected daily organic waste processing rate of around 300 tonnes. The Environmental Protection Department of the Hong Kong SAR has tendered for this project using the DBO model. The project was awarded to CSHK jointly with Jardine Engineering Corporation and AJA Joint Venture which was formed by UK Agrivert Ltd, with operating duration of 15 years. The DBO contract model helped us to fulfil our long-term management promise, ensuring project quality. Since we will undertake the operation work after the project is completed, the cost of the facility’s whole life cycle will be reduced, which is beneficial to the project’s sustainability.

The DBO contract model encourages contractors to search for more innovative and efficient ways to conduct design and operation, allowing us to obtain more flexible adoption of innovative technologies. We introduced advanced UK treatment craftmanship, to create the combined process of anaerobic digestion and granulation in Hong Kong. This doubled the Environment Protection Department’s bidding requirement of 300 tonnes daily processing rate to 600 tonnes with only 2.5 hectares of land. This project is currently one of the most compact food waste treatment plants, setting an example for optimised land use. In order to avoid odour leakage, the facility also adopts a fully negative pressure design, through systematic and point-source ventilation devices, to maintain the in-house pressure of the plant below atmospheric pressure.

Sustainable management of construction site was also enhanced by advanced technologies, including setting up smart trash sorting machines to increase worker’s environmental awareness and reduce waste; setting up rechargeable container for handheld electrical tools to increase its charging standards and efficacy; and reducing the risk of fire hazard occurrence and ensure construction environment safety

In addition, food waste processing adopts the process combination of anaerobic digestion and granulation. Solid content in anaerobic digestion reaches up to 14%, exceeding far beyond the 5% solid content in traditional processing. The granulation process effectively reduces the composting process retention time from the traditional of over 20 days to less than half an hour, and converts digestate to valuable products with commercial value, such as soil conditioner.

The construction of site offices adopted the cutting-edge technology, MiC, with 70% of the construction process being completed in Mainland factories. Components were then delivered to Hong Kong for assembling on site. This significantly reduced the construction time, and consequently minimised the interference and pollution from on-site construction, increasing construction quality. Additionally, we adopted the BIM to facilitate the construction, including using 3D model guidance for collision check, 4D model guidance to smoothen construction process, etc. This high level of detail is extremely rare in Hong Kong’s construction.

The second phase of the waste treatment facilities is expected to start operation in 2023. After commencement, it can reduce fossil fuel used for electricity generation and reduce organic waste disposal in landfills. It is also expected to avoid around 67,000 tonnes of greenhouse gases per year and reduce around 110,000 tonnes of food waste transported to landfills for disposal, further protecting Hong Kong’s environment and natural resources.

CSHK focuses on the innovation of key areas in construction business. With Hong Kong as a platform, it integrates world leading technology management advantages and provides outstanding one stop service throughout the whole life cycle, including design, construction and operation. This provides a driving force for the sustainable development in the new round of industry change in the future of the Guangdong - Hong Kong - Macau Greater Bay Area. From the leading position of environmentally friendly construction, we are also committed to creating shared value for the community.

The seawater desalination plant produces water using reverse osmosis technology, which is expected to produce freshwater at a daily rate of 135,000 cubic metres upon completion. According to the conclusion reached by the government’s advisory team on the “Feasibility Study (CE71/2000) on developing desalination facilities in Hong Kong”, compared to other seawater desalination methods, such as multi-stage flash distillation (“MSF”) and multiple effect distillation (“MED”), the process of reverse osmosis technology has the lowest life cycle cost. It is also confirmed that the technology will be able to produce freshwater that meets “Hong Kong Drinking Water Standards”. Adopting this technology can save resources and cost, and fulfil the concept of sustainability.

This construction project includes land levelling, designing and constructing seawater processing components, such as inlet pipe, pump room, concentrated brine discharge pipeline, that adopts reverse osmosis technology. The laying of 10km long waterpipes allows the transportation of freshwater produced from the proposed seawater desalination plant to the existing freshwater distribution reservoir.

The seawater desalination plant is expected to be put into operation in 2023. The project will reserve space for future expanding, targeting to increase the freshwater production rate to 270,000 cubic metres per day.

To solve Hong Kong’s societal needs, CSHK is committed to applying innovative technologies to lay stable foundation for Hong Kong’s long-term development. Furthermore, in consideration of the rapid increase of water demand in the pearl river delta, the development of seawater desalination technology in Hong Kong can provide sustainable water source, and enhance the good partnership between Hong Kong and other cities around the pearl river delta.