Hong Kong International Airport (HKIA) has long been well equipped with large-scale water-saving facilities, and the airport takes a number of measures to minimise its daily water usage.
Total water management
We adopt a "triple water supply" approach to improve the efficiency of our three major water sources: freshwater, seawater and treated wastewater.
Seawater is used for flushing toilets. It is also used as the cooling medium in the air-conditioning systems of major airport buildings.
We recover wastewater from terminal building kitchens, washroom sinks, and aircraft catering and cleaning activities, and then we treat it for use in landscape irrigation. Our water treatment plant has the capacity to deliver up to 6,000 cubic metres of greywater per day - equivalent to recycling the daily water usage of over 11,000 four-member families. Since 2006 the wastewater treatment plant has treated over 9 million cubic metres of greywater, meeting the irrigation needs of 4.23 million sq m green area on the airport island.
This "triple water supply" approach helps us reduce our freshwater demand by over 50% each year.
Preventing marine pollution
HKIA has a series of measures in place for sewage and storm water discharges. They include:
- Deploying extensive petrol / oil interceptors in areas where a pollution risk exists, including several large-capacity (10,000 litres) units covering apron areas;
- Installing spill traps at stormwater outfalls; and
- Discharging storm water away from the potentially sensitive southern sea channel.
We regularly monitor HKIA's impact on the marine environment. Results indicate that cooling water and storm drain discharges from the airport do not have an adverse impact on local water quality.
Clean potable water
HKIA is committed to ensuring that all drinking water meets World Health Organization standards as well as local standards set by the Department of Health. To ensure compliance, we manage comprehensive, ongoing maintenance and cleaning efforts covering all drinking fountains in the terminals.
Water management performance
|Total volume of wastewater recycled / reused (m3)||140,000||192,000||156,000||182,000||218,000|
|Volume of seawater used for flushing (m3)||2.5 million||2.6 million||2.7 million||2.8 million||2.9 million|
|Volume of seawater used for cooling (m3)||107 million||124 million||126 million||117 million*||105 million*|
* Chiller seawater demand is reduced after enhancement projects