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Wan LixinOpinion deputy editor of Shanghai Daily
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Waste water to banish pollution
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For those already choking in north China’s polluted air, the central heating season could mean more wheezy days to come.
With this in mind, Shijiazhuang — one of the most polluted cities — is trying to cut pollutants released by heating.
About 300 kilometers southwest of Beijing, Shijiazhuang is the capital of Hebei, the province which had seven of the 10 most polluted cities in the country in the third quarter of the year.
Apart from converting coal-fired boilers to gas, Shijiazhuang has piloted utilizing “spare” heat in industrial waste water to warm a community covering 100,000 square meters.
The program in Lijingwan uses effluent from a refinery to warm clean water before the water is heated again by efficient electric boilers in basements. The combination of hot waste water and efficient boilers can cut energy consumption by 44 percent, the local heating office said.
For the Lijingwan neighborhood alone, that means 868 tons of coal could be saved in a single winter.
“We used coal boilers before, but they weren’t hot enough, so we had to buy electric radiators,” said Xie Yanru, a Lijingwan resident. “Now the new system keeps the rooms warm and at a stable temperature, and we don’t need to pay extra fees.”
The heating office in Shijiazhuang is optimistic. Industrial waste heat could help warm an area of 50 million square meters five years from now, it said.
“It turns the waste into a gold mine,” said Zhang Ye, vice mayor of Shijiazhuang, “and reduces emissions.”
Gree Electric Appliances, which provided the equipment for the program, says that 275,000 tons of coal can be saved a year per 10 million square meters of floor area, if coal boilers are replaced.
The new method also substantially cuts emissions of carbon dioxide, sulfur dioxide and dust.
The scheme is feasible in northern cities, which need to fight smog and have mature industrial bases or sewage treatment systems that can provide the residual heat, said Zhang.
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