By treating ever-more wastewater rather than discharging it into its harbor, Hong Kong has been creating a growing mountain of sludge, which is set to overwhelm available disposal sites. With more sewage treatment capacity now under development, the Chinese Special Administrative Region is investing in one of the world’s largest fluidised-bed sludge incinerators. Image courtesy Claude Vasconi/Veolia The Tuen Mun is designed to handle 2,000 tonnes of sludge per day. Because of its isolated coastal location, the project includes a seawater desalination facility that will provide water for the site. Image courtesy Arup Completed in 1997, the sewage treatment plant
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.