There will be some technical visits during the IWA-ASPIRE 2019 Conference. It will tentatively include our prominent waterworks, waste water and storm water infrastructure, such as Stonecutters Island Sewage Treatment Works, Sludge Treatment Facility, Happy Valley Underground Stormwater Storage Scheme, Organic Resources Recovery Centre, Siu Ho Wan Sewage Treatment Works, Tai Po Water Treatment Works, Yuen Long Bypass Floodway, Upper Lam Tsuen River, Stanley Sewage Treatment Works, Western Salt Water Service Reservoirs and High Island Reservoir.
1. Happy Valley Underground Stormwater Storage Scheme
The Happy Valley Underground Stormwater Storage Scheme (HVUSSS) is an important flood prevention project in Hong Kong. HVUSSS innovatively enhances the flood protection level of the city, successfully resolves the flooding problems in Happy Valley and Wan Chai districts.
The adoption of smart and automatic movable weirs, water harvesting system and green building designs has created a more resilient and adaptable drainage system that blends harmoniously with the environment.
2. High Island Reservoir
The High Island Reservoir, located in the Sai Kung Country Park, is the largest reservoir in Hong Kong. The construction work was magnificent, which entailed the building of two rock dams rising 64 metres above mean sea level at the eastern and western approaches of the narrow strait running between High Island and the eastern end of the Sai Kung Peninsula to form a reservoir with a capacity of 280 million cubic metres. Work began in 1971 and was completed in 1979.
The east main cofferdam of High Island Reservoir protected by the concrete "Dolosse" is unique and distinctive. About 7,000 dolosses, each weighing 25,000 kilograms, were placed on the dam wall, interlocked so that they can absorb the force of breakers and alleviate the erosive power of sea waves. The surrounding of east main dam and Po Pin Chau by the queer looking hexagonal columnar rock is also a grandeur.
3a. Organic Resources Recovery Centre Phase 1
Located at Siu Ho Wan in North Lantau, O∙PARK1 is a self-sustainable food waste recycling facility with a treatment capacity of 200 tonnes per day. It adopts advanced anaerobic digestion and composting technologies to convert food waste into biogas for power generation. Apart from generating heat and power for internal use, it is estimated that about 14 million kWh of surplus electricity, an equivalent of the energy consumption of about 3,000 households, can be generated by O∙PARK1. In addition, O∙PARK1 also helps the recycling of resources by generating about 6,500 tons of compost per year as a by-product.
3b. Siu Ho Wan Sewage Treatment Works
Siu Ho Wan Sewage Treatment Works (STW) is a chemically enhanced primary treatment works. It provides sewage treatment services for a population of 200,000 in Chek Lap Kok Airport, Tung Chung, Discovery Bay and Disneyland. The design flow of the Siu Ho Wan STW is 180,000 cubic metre per day. It also has a solar farm comprising over 4,200 photovoltaic panels with an installed generation capacity of 1,100 kilowatts.
4. Sludge Treatment Facility (STF/T•PARK)
T·PARK is a state-of-the-art Sludge Treatment Facility (STF) which combines a variety of advanced technologies into a single complex. It reflects Hong Kong’s vision to embrace the concept of “waste-to-energy” and to transform people’s attitudes towards resource recovery and recycling. The capacity of the STF is up to 2,000 tonnes per day of sewage sludge. The sludge treatment process could be divided to sludge reception, sludge incineration, energy recovery and flue gas treatment. The STF also achieves “zero effluent discharge” in total water management. It is self-sufficient in potable water and process water which is generated on-site through a seawater desalination plant. All wastewater from the facility is treated and reused for irrigation, flushing and cleaning purposes.
5a. Stanley Sewage Treatment Works
Stanley Sewage Treatment Works (Stanley STW) is a secondary sewage treatment works, built in caverns. It serves a population of over 27,000 in Stanley, Ma Hang, Tai Tam, Chung Hom Kok and Red Hill areas, which currently produces around 8,000 cubic metres of sewage per day. Sewage is collected by outlying sewage pumping stations and transferred to the Stanley STW for further treatment.
5b. Western Salt Water Service Reservoirs
To match with the development of the Hong Kong University (HKU) Centennial Campus, re-provisioning of the Western Salt Water Service Reservoirs of the Water Supplies Department (WSD) at nearby location was required. Through the concerted effort of WSD and HKU, the proposal of re-provisioning the salt water service reservoirs inside cavern was adopted. The re-provisioning works commenced in April 2007 and completed in September 2009. The total storage capacities of the re-provisioned salt water service reservoirs are 12,000 cubic metres. This has optimized the land use and avoided substantial cutting of the hillside, hereby reducing the amount of spoil that requiring disposal and minimizing the disturbance to the natural habitat.
6. Stonecutters Island Sewage Treatment Works
Stonecutters Island Sewage Treatment Works is one of the World’s largest chemically enhanced primary treatment plant. The whole system can treat 2.45 million cubic metres of sewage per day. The full commissioning of the Harbour Area Treatment Scheme greatly improves the water quality of the Victoria Harbour and helps to enable the sustainable development of the harbour area.
7. Tai Po Water Treatment Works
Tai Po Water Treatment Works is now undergoing an expansion to double its output capacity to 800,000 cubic metres per day upon completion. Being keenly aware of the responsibility towards the environment, Tai Po Water Treatment Works adopts the award-winning stacked process design to preserve the natural habitat. Various greening, energy efficient, water saving and sustainable features have been developed to make the facility the first water treatment works achieving the BEAM Plus Provisional Platinum accreditation.
8a. Upper Lam Tsuen River
River Improvement Works in Upper Lam Tsuen River alleviate the flood risk in the region. Given the extraordinary conservation value of upstream Lam Tsuen River, we did our utmost to minimise environmental and ecological impacts of our works throughout the design, construction and management stages. With the conservation measures adopted in this project, extensive plant growth on the proposed gabion banks and restored natural riverbed was observed. Populations of some rare wildlife species, such as the Hong Kong Newt, have increased. The river biodiversity was also preserved, with a recovery number of bird, fish and dragonfly species.
8b. Yuen Long Bypass Floodway
Yuen Long Bypass Floodway is to mitigate flooding in Yuen Long Town and its peripheral village areas. It is a main drainage channel built at the South of Yuen Long Town to intercept 40% of the runoff in the Yuen Long catchment. The Bypass Floodway has incorporated a series of environmental designs, such as construction of a 7 hectares engineered wetland. After the one-year establishment period, the engineered wetland has already developed into a sustainable ecological habitat. Continuous monitoring has shown great biodiversity within the engineered wetland with over 130 plant species and various species of birds, frogs, insects and bats.