Method for treating eutrophic lake cyanobacterial bloom

Abstract

The invention discloses a method for treating eutrophic lake cyanobacterial bloom. An enclosure parallel to the local prevailing wind direction is built to block water flow exchange, and large lake cyanobacteria are prevented from entering a control water area. By means of the characteristic that the cyanobacteria floating on the surface layer move with prevailing wind as main drive force, blocking is carried out, the cyanobacteria are guided to the down-wind lakeshore in the direction of the enclosure, and a cyanobacterium enrichment area is formed. A cyanobacterium removal facility is arranged in the cyanobacterium enrichment area, and the cyanobacteria are removed in a large area with high strength. A drainage facilitate with the water flow direction consistent with the prevailing wind direction is arranged, reclaimed water or clean water is drained to enter the control water area to replace contaminated water, and meanwhile water power is enhanced. A water layer mixing facility is arranged in the water area with low water power, the upper water layer and the lower water layer are disturbed, water flow circulation in the transverse direction and the longitudinal direction is generated to the water, the still water environment needed for accumulation of the cyanobacteria is damaged, and the aims of controlling and restraining the cyanobacteria are achieved. According to the method, the cyanobacterial bloom breakout intensity can be effectively controlled, the ecological environment of the nearshore water area is restored, and the water environment quality and the area landscape effect are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of water environment protection, and in particular relates to a method for controlling cyanobacteria blooms in eutrophic lakes. Background technique [0002] The control of cyanobacteria blooms in eutrophic lakes has always been a worldwide problem. When the water temperature of eutrophic lakes rises to 25-35°C, blue-green algae can easily reproduce in large numbers and gather to form water blooms. In particular, the lakeshore belt and still water lake bays in the downwind direction of the prevailing wind are the hardest hit areas for cyanobacteria blooms. [0003] There are currently three main types of control technologies for lake cyanobacterial blooms: 1. The pharmaceutical method of putting algicide or adsorbent; 2. The ecological control method of in-situ cultivation of microorganisms, aquatic plants, and aquatic animal populations that can inhibit algae; 3. , manual salvage or mechanical removal met...

AI Technical Summary

Problems solved by technology

However, due to the complex and changeable physical and chemical environment of natural water bodies, the drug delivery method often has the disadvantage that the drug effect is not easy to exert; at the same time, with the rapid reproduction of cyanobacteria, the dosage of the drug needs to be injected is huge, and once the drug administration is stopped, it will often cause the repetition of cyanobacteria blooms flood

However, the use of ecological manipulation to suppress cyanobacteria will easily lead to the invasion of alien species, which will threaten the living environment of local species and cause a decline in biodiversity, posing serious ecological risks.

Manual salvage or mechanical cleaning methods can carry out targeted cleaning of specific local waters, but they are not suitable for large-scale natural lake surface operations; at the same time, there are disadvantages of high labor and equipment cost loss and difficult management

Therefore, in the face of natural lakes with complex water environment, existing technologies may be able to control cyanobacterial blooms in the short term, but it is still difficult to achieve long-term effective control of cyanobacterial blooms and significantly improve the quality of the water environment

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