The AA’s "triple water system" helps reduce the airport’s freshwater demand by over 50% each year.
Hong Kong International Airport (HKIA) is well equipped with large-scale water-saving facilities, and the Airport Authority (AA) implements a number of measures to minimise daily water usage.
HKIA adopts a "triple water system" to improve the efficiency of its three major water sources: freshwater, seawater and treated wastewater.
Seawater is used for flushing toilets and as the cooling medium in the air-conditioning systems of major airport buildings. This substantially reduces the use of freshwater.
Meanwhile, wastewater from terminal building kitchens, washroom sinks, and aircraft catering and cleaning activities is collected and processed in an on-site wastewater treatment plant, and reused for landscape irrigation.
This "triple water system" helps us reduce our freshwater demand by over 50% each year.
Details of the AA’s water management performance are available in our latest Sustainability Report.
The AA implements various measures to manage sewage and storm water discharges. These include:
The AA regularly monitors HKIA’s impact on the marine environment caused by sewage, storm water discharge and construction activities. Results indicate that cooling water and storm drain discharges from the airport do not have adverse impact on local water quality.
In 2019, the AA approved Hong Kong Aircraft Engineering Company Limited (HAECO) and China Aircraft Services Limited (CASL) to carry out dry wash on the maintenance apron at HKIA. Aircraft dry wash is a technique that involves little or no water in cleaning the aircraft. Compared with wet wash, dry wash is estimated to use 90% less water and produces less effluent.
The AA has also worked with airport business partners to develop Dry Wash Procedures to ensure the cleaning processes are performed in accordance with environmental, health and safety requirements.