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Rain recycling system built in Bird's Nest
By Yu Tianyu (China Daily)
Updated: 2008-05-19 14:29 Beijing's new National Stadium (the Bird's Nest) recycles rainwater that helps keep the facility and its surroundings clean and cool for the Olympics and beyond. China National Chemical Corp (ChemChina) built the rain recycling system. The Bird's Nest has six water collection and storage tanks with a total capacity of 12,000 cu m, and thousands of inlets spread over the roof and lawn that are being used for the same purpose. The rainfall utilization system has adopted membrane separation technology that includes three levels filters: sand filtration, "ultrafiltration", and sodium filtration; three processes of filtration, which can remove dirt and grit particles, bacteria and macromolecule organic material from the collected water. The system has an annual capacity of processing about 67,000 cu m of reclaimed water. The recycled water will be used for washing the stadium, roads, toilets, and garages and for cooling air conditioners, as well as irrigating the land around the venue. About 70 percent of the water supply at Bird's Nest is recycled water, while 23 percent is recycled rainwater. What ChemChina contributed to the Bird's Nest, is one of many steps it is taking towards being a responsible and eco-friendly enterprise. ChemChina, the nation's largest chemical maker, has set a series of targets for zero emissions and integrated them into the company's management and production. Now it has become a leader in the Chinese chemical industry in energy conservation and emission reductions. In 2007, it invested 800 million yuan ($114.65 million) in these efforts. During the first 11 months of 2007, 18 of its key subsidiaries saved 222,600 tons of coal equivalent, lowering its energy intensity by more than 7 percent. The emission of major pollutants was reduced by two percent in 2007. (For more biz stories, please visit Industries)
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