[Central Media see Gansu] The first -class tributary of the Yellow River is no longer black and smelly

The Leitan River is the first -level tributary of the Yellow River. This black and smelly water body that has been avoided by the surrounding people has now bid farewell to the black odor.

In the past, due to the dense population and backward infrastructure, the Thunder Tan River was flowing and garbage. Especially in the summer, the smell is smoked, mosquito flies are in groups, and residents along the river are miserable. In 2018, the floods of the Lei Tan River were rushed to destroy the new sewage pipe network and further exacerbated pollution.

In March 2020, the rectification project of the black odor water body treatment of the Thundei River started. In December 2020, the project was fully completed. The engineering design day collects a sewage capacity of 5,000 cubic meters, and a total of 42.18 kilometers of sewage pipe network is installed.

"Due to terrain restrictions, the pollutants are set up along the main river channel, and the design pipeline is buried below the river bed below 2 meters to prevent the pipeline from being destroyed by the flood. To the 517 sewage outlets directly to the river . The steel pipe has a thermal insulation layer to avoid freezing the tube in winter. "Said Hou Xiaoqiang, director of the Comprehensive Office of the Water Affairs Bureau of Qilihe District, Lanzhou City.

The sewage on both sides of the Leitan River is uniformly collected by the pipe network. Xinhua News Agency reporter Zhang Zhimin Zhang Zhimin

The collected sewage was remitted into the urban sewage competent network. After the treatment of the sewage treatment plant, it was discharged.

Tong Fuye, the person in charge of the rectification project of the Leitan River Black Stink Water Tactics, introduced it. After the project was completed, it established a two -year warranty period. The staff inspects every six months to solve problems such as the blockage of the pipe network, and avoid the rebound of black and odorous water bodies. In June of this year, the staff once again investigated the entire line of Leitan River, and entered 8 new rain and dirty stream pipelines.

After governance, the Leitan River finally stopped dark and smelly, ammonia nitrogen, dissolved oxygen, and oxidation reducing potential to meet the standards.

"The water quality of the dry flow of the Yellow River is getting better and better, and it is stable in category II. In the second quarter of this year, the water quality reached Class Ⅰ, which was rare in the past." Said Zhang Yali, director of the Water Office of the Qili River Branch of Lanzhou Ecological and Environment Bureau.

This is the scenery of the Yellow River dried Lanzhou section (photos of drones) taken on the Yellow River on April 25. Xinhua News Agency reporter Zhang Zhimin Zhang Zhimin

"In the past, the Lei Tan River was dirty and smelly. People were far away from the river and did not dare to go to the river. Now the environment is good, often walking by the river, people and river become close." Yang Zhengxi, a villager in Houwuquan Village, Bali Town. (Reporter Zhang Yujie)

Source: Xinhua News Agency

Edit: Xu Minzhi Editor: Zhu Wang School Review: Du Yingsing

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