A cofferdam was built in the middle of the lake to drain the water and dig the bottom mud

The city's two sessions have just concluded, the government work report proposed this year to do 35 things to improve people's livelihood, effectively enhance the general public's sense of gain and happiness. Objectives, tasks and responsibilities have been clearly defined. The key is to work hard and roll up our sleeves. From today, this newspaper launched the column of "New Year walk to the grassroots, witness the reality of people's livelihood", which reports the solid progress of the reality of people's livelihood one by one through the on-site experience of reporters.

The lake was almost drained, and the whole lake was divided into three parts, one showing the bottom, the other two only shallow water and mud. Behind the construction enclosure, a blue drying machine is turning silt pumped from the bottom of the lake into a dry black powder.

This is the environmental remediation site of North Lake Yueya Lake in Qinhuai District. It is also the daily work place of Yuan Daying, the project manager. In this year our city determined 109 black smelly river remediation plan, Crescent Lake is the first project to start remediation. When the reporter visited here on the 14th, Yuan Daying was across the lake and "directed" the reporter to find him on the other side by telephone. To the opposite side of the lake, you pass a "bridge" -- a cofferdam made of steel pipes to divide the lake into sections. The north side of the cofferdam has been drained and dredged, and the south side is a sedimentation tank. The cofferdam is covered with a few planks, just big enough for a person to pass through. This is the passage for construction workers to and from each other every day, and Yuan would walk dozens of times here every day.

These days the temperature in Nanjing is very low, walking on the cofferdam, the wind is particularly big, one side is the bottom of the lake, one side is mud, at the foot of the steel pipe, walking on the cofferdam will inevitably be frightened, and the workers have been accustomed to, like walking on the ground. The lake and the cofferdam were lined with long pipes at least 20 centimetres thick that pumped water and silt, and several buckets of thick drains were pouring black mud into the settling tanks.

"Look, the diggers over there are dredging the middle of the lake." Yuan said, pointing to a large machine in the middle of the lake.

His face was red with cold, and his trousers were covered in mud from knee to knee. Sediment contains a large number of pollution substances, just like the "cancer" of rivers and lakes, is an important factor causing water pollution. After the water is drained, large machinery goes straight into the lake to dig up the mud until it reveals a "healthy" bottom.

Crescent Lake is divided into North Lake and South Lake, after the camp road as the boundary, North Lake remediation on December 10 last year first started. In order to completely solve the moon Lake black odor phenomenon, the water department developed in the remediation program, the first step is to drain the lake completely dredging. Jinrun Construction Group Co., LTD., where Yuan Daying works, became the construction unit through bidding. After the project department entered the building, the cofferdam was first built, then the water was pumped and the silt was removed. At the time of the interview, the dredging project was nearing completion, with 70,000 cubic meters of dredging completed out of about 110,000 cubic meters. "At the peak we had more than 200 workers on site working overtime." Yuan Daying said.

It has been more than 20 years since the lake was last dredged in 1995. "When the lake was drained, there was all kinds of rubbish at the bottom of the lake besides silt, and it was very smelly." 'There's a lot of construction waste at the bottom of the lake,' Ms. Yuan said, frowning. 'There's even furniture like small beds and tables, and a lot of car tires.'

At the scene, the reporter found that the "bottom" of the crescent Lake became a piece of mud, but the place to complete the dredging, the lake bottom mud is no longer black, but dark brown, there is no odor. It turned out that after the dredging, the black sediment that had polluted the lake had been dried and taken away, and the garbage had all been cleaned up.

Black smelly river regulation in the most critical step is to intercept the pollution, the crescent Lake is drained after dredging, hidden in the bottom of the lake outlet has no place to hide. "Once the lake was drained, 23 vents were exposed!" Yuan says the project department has also been tasked with figuring out which outfalls are sewage outfalls. Yuan Daying and the workers came every day to inspect, as long as it was sunny and still draining, that is the sewage outlet. A check just know, only the North Lake this piece, domestic sewage outlet there are 10. Hard to carry out the dredging results can not give sewage "restore", the project department of sewage drainage report to the Qinhuai District Water Bureau, Yuan British also let workers every day in the lake to find, see if there are other units to the moon lake sewage, "a check is really there, there is a car wash wash water directly into the lake."

At present, four of the 10 sewage outfall in Beihu have been completed.

According to the project progress forecast, in about a week, the dredging project here will be completed, followed by the clean treatment of the bottom of the lake. "I guess it will be Chinese New Year after all these are done!" Yuan Daying told reporters, because the project time is tight, this year he can not go home for the Spring Festival, stay a few days will come back to the site. "Crescent Lake South Lake is also playing cofferdam, after the Spring Festival will start remediation." Yuan said he would be glad to see the lake in front of Nanjing residents with a new look when the renovation is completed by the end of May next year.

Source: A1, Nanjing Daily, January 16, 2017