Special Announcement

Where Water Flows Further

As one of the busiest airports in the world, operations at Hong Kong International Airport (HKIA) require significant amounts of water each day. Basic demands like ensuring running water in bathrooms and kitchens, providing water for aircraft washing, and ensuring an adequate supply of drinking water mean that water is essential to the daily running of the airport. To help conserve Hong Kong’s precious water supply, HKIA has long been equipped with large-scale water management systems and technology.

Achievements

HKIA went beyond basic environmental compliance by installing its cutting edge Triple Water System (TWS) in 1998. The TWS is an advanced water management system that delivers water through separate supply pipelines in order to maximise water efficiency.

The TWS comprises the following systems for different purposes:

  • A conventional fresh water supply system provides water for drinking, catering and fire fighting
  • A seawater supply system is used for air-conditioning inside terminals and other HKIA buildings, as well providing flushing water for toilets throughout the airport
  • Greywater is collected through a separate system, treated in a wastewater plant and reused for landscape irrigation

Treating wastewater in line with the Government's rigorous standards, the AA's wastewater treatment plant has a current daily handling capacity of 6,000 cubic metres. The plant utilises three Membrane Biological Reactor (MBR) tanks with a total of 8,000 membrane panels to make greywater (used water from kitchens, washbasins and aircraft cleaning) suitable for irrigation, and is the largest plant in Hong Kong utilising this pioneering technology.

Installation of the TWS has reduced HKIA's annual freshwater demand by around 50% - in addition to reducing energy usage, lowering output of greenhouse gas emissions and delivering financial savings through reduced operating costs.

Did you know?

HKIA's wastewater treatment plant can recycle 6,000 cubic metres of greywater every day - equivalent to the daily water usage of 11,000 four-member families.

HKIA's wastewater treatment plant for greywater management

HKIA's wastewater treatment plant
for greywater management

Treated greywater is used for irrigation across the airport island

Treated greywater is used for irrigation
across the airport island

HKIA's wastewater treatment plant is the largest plant in Hong Kong using MBR technology

HKIA's wastewater treatment plant is the largest plant in Hong Kong using MBR technology

HKIA ensures treated greywater meets strict regulatory standards

HKIA ensures treated greywater meets
strict regulatory standards