Ecological restoration method for municipal eutrophicated river

Abstract

The invention discloses an ecological restoration method for a municipal eutrophicated river. The method comprises the following steps: arranging a barring and controlling water level system at a barring and controlling water gate of the river; in the main stem of the river, piling cubic meters of earth obtained after desilting to form an along-river gentle slope and a river-center island, wherein a bank slope ratio is 1: 2.5 to 1: 5, and a shoal water zone and a deep and broad water zone are successively formed from a dam of the river to the center of the river; carrying out rock mound type and jack-like concrete block type bottom shape reconstruction on the slope surface of the along-river gentle slope; constructing embankment-zone aquatic plant zones at the river-center island and the along-river gentle slope having undergone bottom shape reconstruction and constructing a plant floating bed bio-zone in an along-river zone; and releasing filter-feeding and omnivore fish, shellfish and shrimps. With the restoration method provided by the invention, the water quality of the river is improved from class IV and V to class III or a higher class; biodiversity of a water area is increase by more than 2 times; the river has better capability in smooth regulation of water storage and flood discharge; and a water system has the further improved functions of underground water supplement, carbon immobilization, oxygen release, climate adjustment, water conservation, etc.

Description

technical field [0001] The invention relates to the technical field of water body restoration, in particular to a method for ecological restoration of urban eutrophication river courses. Background technique [0002] With the rapid development of the economy, a large amount of industrial wastewater and domestic sewage are discharged into surface water bodies such as rivers and lakes, and these wastewaters carry a large amount of nutrients. Due to the discharge of nitrogen, phosphorus and other elements, and the lack of necessary circulation in the water body, the algae and other plankton will multiply rapidly, the dissolved oxygen in the water body will decrease, the water quality will deteriorate, and fish and other organisms will die in large numbers, resulting in eutrophication of the water body. Destroy the aquatic ecological balance and form algal blooms. During the decay process of algae and other plankton residues, a large amount of nutrients such as nitrogen and pho...

AI Technical Summary

Problems solved by technology

In the method of aquatic plant remediation, if a large number of aquatic plants die and are not cleaned up in time, they will easily block the river, and the plant residues will cause greater river pollution after they rot.

[0009] To sum up, using only one water ecological restoration technology to treat polluted water bodies has limited treatment effect, and each ecological restoration technology has its own advantages and disadvantages

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