"In the second quarter of this year, the water quality at the Qilihe section of the Yellow River was graded Class I, which was rare in the past," Zhang added. "The water quality of the mainstream of the Yellow River is continually improving," said Zhang Yali, an official with the Qilihe branch of Lanzhou ecology and environment bureau. Leitan River is no longer black and odorous today, thanks to the arduous wastewater treatment efforts. "In 2021, our treatment capacity increased from 260,000 to 300,000 tonnes after an upgrade, which has helped improve the water quality of the Yellow River," said Zhang Lei from Yan'erwan wastewater treatment plant, where the sewage is treated. Today, sewage along the river, a tributary of China's Yellow River, is collected and transported to the main urban sewage network and discharged after meeting environmental standards. 3 (Xinhua) - The once-polluted Leitan River in Lanzhou City, capital of northwest China's Gansu Province, has taken on a new appearance following the completion of a water treatment project in December 2020.
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