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...

AI Technical Summary

Problems solved by technology

[0004] At present, most domestic methods for ecological restoration of eutrophic waters use microbial purification methods. Due to the large number of microorganisms and fast decomposition speed, this method can quickly achieve obvious results in a short period of time; but it is also due to the short life cycle and vitality Depending on the water temperature and other reasons, the decomposed N and P cannot be completely removed from the polluted water, so this method is only suitable for short-term water pollution treatment

In China, the method of macroscopic aquatic animals and plants is used for ecological water treatment, usually only using submerged vegetation restoration or only using filter-feeding fish to control algae to purify water quality, and usually in small-scale (such as less than 100 mu) closed water bodies, Or carry out ecological water treatment in water areas where the water level and flow can be controlled manually, but for larger-scale water bodies, it is difficult to achieve ideal results with this single method

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