Method for removing water eutrophication

Abstract

The invention discloses a method for removing water eutrophication, which comprises the following steps of: investigating a community structure of aquatic organisms in water body, and finding a missing link or broken link in a food chain according to an investigation result; stocking predacious fishes in the water body, removing small trash fishes and herbivorous fishes from the water body by adopting a medicament mode or a manual fishing mode, and regulating the community structure of the fishes in the water body; planting submerged plants, floating plants and emergent aquatic plants in the water with the depth of 0 to 1.5m; and stocking filter-feeding fishes, filter-feeding shellfishes, detritus feeding benthonic animals and herbivorous fishes in the water body. The method for removing water eutrophication can realize the removal of the water eutrophication and ecological restoration for large-scale water body of which the parameters cannot be manually controlled, effectively inhibit the outburst of algal bloom and keep the stable quality of the water body.

Description

technical field

[0001] The invention relates to the field of ecological restoration of water bodies, in particular to a method for removing eutrophication of water bodies. Background technique

[0002] In recent years, the phenomenon of water pollution and eutrophication has been very serious. From a national perspective, among the 27 key lakes and reservoirs monitored, 20 lakes and reservoirs have water quality of IV-bad V, as high as 74%. Among them, the water quality of the "three lakes" (Taihu Lake, Chaohu Lake, and Dianchi Lake) is inferior to Class V, and the main pollution indicators are total nitrogen and total phosphorus. Especially in May 2007, the Taihu Lake cyanobacteria bloom event directly affected the drinking water safety of Wuxi residents. From the perspective of Shanghai, 83% of the water quality in the upstream water source is V or worse than V. As one of the water sources, Dianshan Lake has experienced algal blooms to varying degrees almost every year in...

Examples

Embodiment 1

[0042] The specific implementation process of the method for removing eutrophication of water body by utilizing the aquatic ecosystem integration of the present invention is described in combination with the actual project case - ecological restoration of the water environment of Dian Lake. The project artificially constructs an aquatic ecosystem, uses the inherent trophic cascade relationship of aquatic organisms, configures aquatic benthic animals, fish, and aquatic plants with water purification functions, and establishes an efficient short food chain. Harvesting aquatic plants reduces secondary pollution and achieves the purpose of quickly removing or reducing nutrients in the water body. Through field ecological surveys and indoor experiments, combined with the results of on-site water quality and ecological index testing, the ecological fishery water conservation strategy for long-term management and maintenance of water quality in Dadian Lake was further formulated.

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technical field

[0001] The invention relates to the field of ecological restoration of water bodies, in particular to a method for removing eutrophication of water bodies. Background technique

[0002] In recent years, the phenomenon of water pollution and eutrophication has been very serious. From a national perspective, among the 27 key lakes and reservoirs monitored, 20 lakes and reservoirs have water quality of IV-bad V, as high as 74%. Among them, the water quality of the "three lakes" (Taihu Lake, Chaohu Lake, and Dianchi Lake) is inferior to Class V, and the main pollution indicators are total nitrogen and total phosphorus. Especially in May 2007, the Taihu Lake cyanobacteria bloom event directly affected the drinking water safety of Wuxi residents. From the perspective of Shanghai, 83% of the water quality in the upstream water source is V or worse than V. As one of the water sources, Dianshan Lake has experienced algal blooms to varying degrees almost every year in...

Examples

Embodiment 1

[0042] The specific implementation process of the method for removing eutrophication of water body by utilizing the aquatic ecosystem integration of the present invention is described in combination with the actual project case - ecological restoration of the water environment of Dian Lake. The project artificially constructs an aquatic ecosystem, uses the inherent trophic cascade relationship of aquatic organisms, configures aquatic benthic animals, fish, and aquatic plants with water purification functions, and establishes an efficient short food chain. Harvesting aquatic plants reduces secondary pollution and achieves the purpose of quickly removing or reducing nutrients in the water body. Through field ecological surveys and indoor experiments, combined with the results of on-site water quality and ecological index testing, the ecological fishery water conservation strategy for long-term management and maintenance of water quality in Dadian Lake was further formulated.

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