NENT is one of the main landfill in Hong Kong, with a total disposal capacity of 35 million cubic meters. In order to cope with increasingly upgraded environmental requirements in Hong Kong, NENT adopts the most advanced landfill technology.


During the whole design and construction of landfill, a multiple-layer synthetic liner system was used to cover the entire construction area to make the landfill become a reliable leakage proof facility. Landfill gas and leachate are treated on site, which not only ensures no untreated pollutants are discharged into the environment, but also avoids direct emission of CH4 and odor. Treated landfill gas can be used as renewable energy sources, which can not only provide power for facilities at the site, but also be used as heating fuel in the process of leachate treatment.


In June 2003, the landfill signed a 25-year agreement with Hong Kong and China Gas Company Limited (Towngas), a local fuel gas supplier, aiming to develop the landfill gas treatmeat system. As one of the largest green energy recycling projects in the world, after being treated the landfill gas will be transported to the production sites of Hong Kong and China Gas Company Limited in Dapu through a 19 km underground pipeline to replace traditional petroleum gas; and thus waste is converted to energy.


When the landfill is statured, the filling operation will be stopped and the landfill will be closed; however, the biochemical reaction inside the landfill will still continue for dozens of years. We have rich experience in the aftercare of the landfill after it’s closed. In the landfill aftercare process, all the generated leachate and CH4 should be collected, continuously monitored and treated; besides the the site will be greened. In some projects, SITA has transformed closed landfills into public recreational facilities.