Cai Jiahe is not famous in Hangzhou, but in Shiqiao area, it is far more famous because the river is black and smelly. Yesterday, the Xicheng District Riverway Supervision Center placed something in the Caijiahe River. It is said that after two months, water quality will be improved from inferior five categories to four categories.
The banks of the Caijiahe River are farm houses. The direct discharge of domestic sewage into the river, together with surface runoff and other reasons, causes the ammonia nitrogen content of Caijiahe to seriously exceed the standard, eutrophication of the water body, and the resulting lack of oxygen in the water body, making Caijiahe a “ Black smelly river."
What was put into the Caijia River yesterday was a kind of bionic water plant that is said to purify water.
The top of this biomimetic weed is a plate-shaped solar receiver that converts solar energy into electrical energy and then aerates it through an aeration device to increase the dissolved oxygen content of the water. The lower part of the receiver is fixed on a plastic floating basin. Under the floating basin, a carrier similar to water grass is fixed. The biofilm containing microorganisms is attached to the carrier to accelerate the decomposition of organic matter in the water.
Caijiahe is one of the 30 rivers designated by the Black River in Hangzhou in 2013. The Xinhui Street to the Shiqiao section will be the first bionic water experiment in Zhejiang Province. It is estimated that this section will be about 400 meters long. On the other hand, 200 groups of bionic plants are to be placed.
The manufacturer of biomimetic plants also experimented with water samples taken from the Caijia River. Under conditions of stable water quality, a set of biomimetic plants with a surface area of ​​1 square meter was placed in 18 cubic meters of water. In two weeks, the transparency could be increased from about 30 centimeters. About 2 meters, water quality improved from inferior five categories to four categories.
According to Yan Gaogong of the urban river monitoring center, in addition to the use of bionic water weeds, black muddy rivers are subject to dredging and other ecological remediation. Finally, long-term conservation and cleaning of workers are required. At present, 18 of the 30 rivers designated for governance in Hangzhou this year have already passed acceptance at the end of August. (Correspondence reporter Hua Wei Huang Xiuhan)
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