Shanghai World Expo examines water's significance to cities (3)

14:56, May 07, 2010      

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According to the introduction, Singapore suffered serious water shortages in the 1960s and 1970s. But Singapore overcame its water problems and ensured its water supply with four strategies: collecting rainwater; creating "Newater" (recycling sewage water); desalting seawater; and purchasing water from other countries.

In the Urban Best Practice Area, Chengdu, capital city of southwest China's Sichuan Province, introduces a small ecosystem to purify river water.

It replicates a garden in Chengdu with a scale of 1:10. In the garden, dirty river water is pushed by a windmill to a pond for anaerobe treatment, the first step of purification. The water then flows through about 20 smaller ponds where different plants are grown to absorb pollutants.

"Through this small ecological system, polluted water is made clean and enriched with oxygen. It is good enough for fish to live in," said Li Siyue, a guide working at the project.

Near the Chengdu pond, the Spanish capital Madrid also displays a water recycling system, which is claimed to be the most effective in Europe.

The city' s sewage plants have an annual treatment capacity of 300 million cubic meters which processes all city's sewage, according to the introduction.

Annually, 6 million cubic meters of recycled sewage water is pumped to the city' s fountains and public parks and used to clean streets through 150 km of underground pipeline.

Ignacio Nino, the Madrid exhibit's general coordinator, told Xinhua based on Madrid' s experience, sewage treatment, waste treatment and city greening are the most basic elements to protect a city' s environment.

"Once a city does well in these three aspects, naturally the environment will be good," he said.

Source: Xinhua

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