A secure containment facility
The two landfills: the WENT (West New Territories) and NENT (North East New Territories) landfill, have a capacity of 63 Mm3 and 35 Mm3 respectively. It incorporates high-density, multi-layer composite coating systems covering the entire surface of the landfill site, complete leachate collection and processing equipment. The latter contains biogas and liquid leachate for further treatment to avoid environmental risks.
The environmental, health and safety (EHS) management systems at both NENT and WENT are certified in accordance with ISO14001:2015 and OHSAS18001:2007 system. NENT is also the first landfill site to have ISO9001 certification in Hong Kong. Its quality management system is currently certified in accordance with ISO9001:2015.
Landfill gases recovered
NENT and WENT are one of the best examples of the recovery and reuse of “green” energy in the world.
The anaerobic degradation of waste in a landfill environment produces landfill gas. Once landfill gas is collected, it is used as a renewable energy source for ammonia stripping at the leachate processing station and on-site power generation at both landfills. Surplus landfill gas is either processed into Synthetic Natural Gas and transmitted to local town gas plant as an alternative heating fuel or transmitted to power generation units connected to existing power grid.
Safeguard the environment nearby from pollution
The recovery of landfill gas support conservation of depleting natural resources – fossil fuel, as well as support climate impact mitigation in Hong Kong.
Key Figures
4.9 million tons
of waste buried every year in both landfills
40 million m3
of landfill gas collected and used for energy/electricity production annually