Waste water contaminated with dye that was discharged into a section of China's Yellow River has turned it red for the second time in a month, state media reported Wednesday.China's second-largest river turned red for more than an hour Tuesday in Lanzhou, a city of 2 million and the capital of the western province of Gansu, the Beijing Youth Daily newspaper said.
The newspaper said the polluted section was two 2 kilometers (1.24 miles) long.
The river was polluted by waste water discharged by a heating station, Xinhua News Agency said. The discharged water likely came from boilers in which hot water was dyed red to prevent people from diverting it for their own use.
Environmental officials have found that the discharge was not toxic, Xinhua said.
The pollution also caused the river to smell, the Beijing News paper said.
It was the second time in a month that the same section of the Yellow River turned red from pollution.
In late October, the Lanzhou Tanjianzi No. 2 Heat Providing Station was reportedly fined for discharging dyed water into the river.
The Yellow River, which flows across northern China, is the source of drinking water to dozens of cities and tens of millions of people. It has thousands of chemical factories along its banks.
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