After the completion of the rectification of Nanjing black smelly river, aeration device was installed to consolidate the effect

People passing by the Myeongyu River these two days will find a new row of devices like a small fountain in the middle of the river, bubbling continuously. Reporters learned that this is a kind of aeration device, the main role is to increase the oxygen in the river.

Last year, the city completed the renovation of 36 black and smelly waterways (40 sections), including the Mingyu River. The water quality of these waterways has been significantly improved by cutting pollution and removing silt. How to maintain the results of regulation, so that the river is always clear? Our city has taken some technical consolidation measures, adding aeration device is one of them.

The Mingyu River is a 600-year-old river with a total length of more than 2,700 meters. The source of the lake is Crescent Lake. The water enters through the mouth of the Dark Hankou Gate, exits from Houbiao Ying to Wulong Bridge, passes through Yudao Street, Yuhe Road, Jiefang South Road, Babaoqian Street and other streets, comes to the half bridge of Longpan Middle Road, and finally joins the eastern section of the Inner Qinhuai River through the dark Han and across Longpan Middle Road. Although the river is not wide, it is an important link between the Crescent Lake and the inner Qinhuai River. Ming royal river in the past due to the poor environment along the coast, the river black stink has been exposed by the media many times, now after the completion of regulation, its appearance takes on a new look - reporters yesterday along the river walk a circle, in the Wulong bridge junction, a new riverside park has appeared; The environment along the river has been renovated, especially after the relocation of the farmers' market on Ruijin Road, the original illegal construction on both sides of the river has been removed, exposing a clean river bank. Royal River Road to half bridge, the middle line of the whole section of the river set up a long row of "small fountain", is gurgling "work"; Near the river, no longer see the past muddy water, water clear, no smell.

According to the water department, the Mingyu River renovation project investment of more than 51 million yuan, including pollution intercision, dredging, etc. in the second half of last year, the renovation project has been completed, solved the past decades of domestic sewage, farmers' market wastewater, sewage along the river public toilet straight discharge to the river. This year, Qinhuai District will also focus on the Mingyu River along the river environment improvement, in addition to the landscape, the installation of aeration device is also one of the measures. "This aeration unit is not the same as the other separate units in the river. It's called full line aeration." The relevant person in charge of the water Bureau of Qinhuai District introduced that the aeration device is similar to the aeration device in the family ornamental fish tank, which is driven to the river by electricity. Because of the slow flow of the Mingyu River, the eutrophication of the river is more serious. Combined with the needs of the river oxygenation and landscape, this special aeration device was set up. Such a device on the river water quality improvement effect is obvious, in a recent river monitoring, the Mingyu River water is not black odor.

In addition to the complete installation of such point aerators, other types of aerators can also be seen in some of our city's regulated river channels. For example, in the Qingshui Pond and the eastern section of the Inner Qinhuai River, the bottom of the aerator floats on the river like a boat, which seems to be much more powerful than the full line aerator of the Mingyu River. Qingjiang River in Gulou District, Honghua River in Qinhuai District, Baijia Lake in Jiangning District and a number of other river lakes have also installed this device.

During the interview, the reporter learned that the main function of the aeration device is to oxygenate the river. "An important test standard for black and smelly rivers is the concentration of ammonia nitrogen. If the concentration exceeds the standard, it is black and smelly, and the reason for the excessive concentration of ammonia nitrogen is the lack of oxygen in the river." Experts from the water department said that the water flow in the urban river is slow and some lack of water. After the regulation, some broken rivers have been changed to increase water flow, but the water flow is still too slow. If some water purification devices are not added in the later stage, the water quality will still be black and smelly.

In addition, the completed river channels will continue to purify the water through ecological floating islands, planting of aquatic plants, fungi and fish, which is being carried out in the river channels that the city completed last year. Water department introduction, pollution and silt is like a major operation to the river, remove the "lesion", but to let the river clear, still need to continue to "conditioning", aeration device and other "artifacts" like to the river to eat "supplements", let it step by step become clear beauty.

Source: Nanjing Daily, Feb 28, 2017