Method for treating eutrophic lake cyanobacterial bloom

A technology of cyanobacteria blooms and eutrophication, which is applied in the direction of dams, water conservancy projects, and river regulation, etc., can solve problems such as the difficulty in exerting the efficacy of pharmaceutical methods, the stress of the living environment of local species, and the flooding of cyanobacteria blooms, etc., to avoid chemical pollution. Possibility of pollution and biological invasion, overcoming the shortcomings of pharmaceutical methods and ecological manipulation methods, improving the quality of water environment and the effect of regional landscape effects

Inactive Publication Date: 2016-10-12
云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 biodi

Method used

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  • Method for treating eutrophic lake cyanobacterial bloom
  • Method for treating eutrophic lake cyanobacterial bloom
  • Method for treating eutrophic lake cyanobacterial bloom

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0037] Such as Figure 1-7 As shown, a method for controlling cyanobacterial blooms in eutrophic lakes is to set enclosures along the local prevailing wind direction in the polluted waters, the two ends of the enclosures are connected to the lake shore 1, and the bottom of the enclosures is fixed on the bottom of the lake to connect the enclosures with the lake shore. To form a relatively closed treatment area 2 in the coastal waters for the boundary, block the exchange of water bodies inside and outside the treatment area, block the cyanobacteria outside the treatment area from entering the area, divert the cyanobacteria inside and outside the treatment area to the lake shores at both ends of the enclosure, and form cyanobacteria Enrichment area: introduce external water sources to replace polluted water bodies and enhance hydrodynamic force, the flow direction of external water sources in the treatment area is consistent with the local prevailing wind direction; set water lay...

Embodiment 2

[0039] Repeat Example 1, with the following differences: the enclosure is a two-layer structure, and the inner enclosure is fully enclosed and impermeable up and down to block the exchange of internal and external water flows, and the blocking and diversion are driven by the prevailing wind to gather and Moving cyanobacteria; the outer enclosure is a semi-closed enclosure, the top is impermeable, blocking the surface water flow, blocking and diverting the cyanobacteria gathered and moving with the prevailing wind as the driving force, the middle and lower part is open; the inner enclosure 3 The distance between the enclosure 4 and the outer layer is 5 meters, and the external water source is clean water. The water layer mixer is equipped with a device according to the water area of ​​25 meters × 25 meters, and the algae removal device is a screen filter type device.

Embodiment 3

[0041] Repeat Example 2, with the following differences: the distance between the inner wall enclosure 3 and the outer layer enclosure 4 is 6 meters, and the inner layer enclosure is composed of floating body 10, frame 11, water-proof material 12 and gabion 13 four parts , the floating body 10 is fixed on the top of the frame 11, the water-proof material 12 is fixed in the frame 11, the gabion 13 is connected to the bottom of the frame 11; the inner enclosure 3 is fixed on the bottom of the lake through the gabion and sealed. The outer enclosure 4 is composed of a floating body 10, a frame 11 and a gabion 13. The floating body 10 is fixed on the top of the frame 11, and the gabion 13 is connected to the bottom of the frame 11; the outer enclosure 4 is fixed to the bottom of the lake through the gabion. The floating body 10 is foam plastic, the frame 11 is nylon rope, and the water-proof material 12 is rubber. The water layer mixer is equipped with a device according to the wate...

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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...

Claims

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Application Information

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IPC IPC(8): E02B3/02E02B3/10E02B15/10
CPCE02B3/02E02B3/106E02B15/10
Inventor 杨逢乐李杰王志芸田军
Owner 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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