Ecological algae control method for lake

Abstract

The invention discloses an ecological algae control method for a lake, which comprises the following steps: setting up a fence area at an open water band or a coastal band of the lake, wherein the fence mesh is 3 to 6 centimeters; and throwing 30 to 75 / hectare of siniperca, 30 to 75 / hectare of topmouth culter and 50 to 100 g / m2 of corbicula fluminea into the fence area. The ecological algae control method can filter blue algae, reduce the biomass of algae, reduce the contents of N and P in the water body, cut down the nutrition load of the water body, has lower running cost and good recycling property and operability, and is favorable for long-term cyclic operation.

Description

technical field [0001] The invention belongs to the field of environmental ecological engineering, and in particular relates to an ecological algae control method for lakes. Background technique [0002] Eutrophication refers to the large amount of inorganic nutrients such as nitrogen (N) and phosphorus (P) required by organisms entering relatively closed water bodies such as lakes, estuaries, and bays. Under the comprehensive action of suitable external environmental factors, algae multiply rapidly. A phenomenon that causes water blooms. At the same time, it may also lead to a decrease in dissolved oxygen in the water body, deterioration of water quality, and even mass death of fish and other aquatic organisms. [0003] my country is a country with many lakes. The total area of ​​lakes accounts for about 0.8% of the total land area of ​​the country. However, the lake environment in my country is very fragile, and the process of eutrophication of lakes is rapid. Many lakes ...

AI Technical Summary

Problems solved by technology

In May 2007, the algae outbreak in Taihu Lake caused the pollution of some drinking water sources in Wuxi City, causing more than 1 million residents to have difficulty drinking water and causing huge economic losses.

[0005] The existing lake ecological restoration method mainly uses the polyculture method of large shellfish and filter-feeding fish to eliminate cyanobacteria, but this method has the following problems: (1) Although large shellfish have a certain filter-feeding ability to algae, but Large-scale shellfish outlet holes have a strong drainage effect and have a greater agitation effect on the bottom of the water body, making the N and P deposited in the bottom mud disturbed and entering the water body, which is not conducive to the reduction of N and P content in the water body; ( 2) Since silver carp, silver carp and other filter-feeding fish cannot self-reproduce in lakes, the existing method is to put artificially propagated filter-feeding fish in lakes every year and cultivate filter-feeding fish through ponds, so the operating cost is relatively high, and it is not necessary to Good for long-term cycle operation