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Method for achieving conversion between algae and grass in shallow lake by utilizing cohesive soil

A clayey soil and lake technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2011-08-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, in winter and spring, there is no report on the ecological restoration technology of using clayey soil to improve the substrate and regulate the transformation of algae-grass in lakes.

Method used

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  • Method for achieving conversion between algae and grass in shallow lake by utilizing cohesive soil
  • Method for achieving conversion between algae and grass in shallow lake by utilizing cohesive soil
  • Method for achieving conversion between algae and grass in shallow lake by utilizing cohesive soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 Coverage effect experiment of different materials

[0015] Select clean soil, kaolin, illite, bentonite, sepiolite and silicon dioxide from the coast of Shiba Bay, Taihu Lake, Wuxi as materials, dry them naturally under the sun, then crush and grind them, pass through a 180-mesh sieve, and put the pretreated Add different materials into 500ml beakers respectively, add clay materials about 2cm thick from the bottom to each beaker, then add 400ml deionized water to each beaker, stir well, after standing for two days, the different clay minerals basically settle at the bottom of the beaker , the settlement effect of the shore soil and illite is the best, and the supernatant is clarified. Use a six-connected stirrer to ensure that the stirring bar is just at a height that cannot touch the clay layer to stir the supernatant in each beaker. The fixed speed is 40r / min, and the turbidity is measured respectively under different stirring times (such as figure 1 shown)...

Embodiment 2

[0016] Example 2 Comparative experiment on the restoration effect of submerged vegetation under the condition of anaerobic sediment and shore soil remediation sediment

[0017] at 1m 3 Put anaerobic sediment at the bottom of the ecological simulation tank, set up an anaerobic sediment control group without adding soil and a restoration group covered with soil, the water depth of each tank is 70cm, the light conditions: L:D=14:10, water temperature 25 ℃, light intensity 166μw / cm 2 . Sow bitter grass seeds on the sediment. After 5 days, white seed buds appeared on the sediments of both groups; after 10 days, the seed buds of the restoration group appeared green, while the seed buds of the control group were still white. After 20 days, the bitter grass in the restoration group had tilled, green branches and leaves grew, and the plants became taller and thicker, while in the control group, only a small amount of white seed buds and some black rotten buds remained, and the height ...

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Abstract

The invention provides a lake eco-restoration method for regulating and controlling rapid conversion between algae and grass in water by utilizing dormancy slot of blue algae by virtue of cohesive soil to improve substrate condition of a shallow lake. The method specifically comprises the following steps: selecting local lake soil or clay mineral material which is low in cost and safe in ecology and has good viscosity; and spraying and covering the substrate of the eutrophic shallow lake for isolating blue algae seed sources and anaerobic sediments, improving the environment of the substrate, promoting the rapid restoration of submerged vegetations planted along with clayey soil in the dormancy slot of the blue algae in winter and spring and controlling and regulating the shallow lake to be rapidly converted to a grass-shaped lake from an eutrophic algae-shaped lake, thereby effectively preventing the recovery of the blue algae in spring and breakage of the blue algae in summer. The method can be applied to substrate improvement and ecological recovery of lake, pond and landscape water.

Description

technical field [0001] The invention relates to a method for using cohesive soil to improve the bottom quality of shallow lakes in winter and spring to regulate the rapid transformation of algae and grass in water bodies. The invention belongs to the field of bottom quality improvement and ecological restoration of eutrophic lakes. Background technique [0002] At present, more than 66% of lakes and reservoirs in our country are at the level of eutrophication, among which heavy eutrophication and super eutrophication account for 22%, which makes eutrophication a major water environment problem for a long period of time in the future. The key to eliminating lake eutrophication is to reduce the nitrogen and phosphorus in the lake water and the organic carbon and nitrogen and phosphorus loads in the sediment. In recent years, after exogenous pollution has been controlled to a certain extent, people have found that sediment has become an important reservoir of pollutants, which...

Claims

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Application Information

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IPC IPC(8): C02F3/32
Inventor 潘纲王丹代立春周莹杨波
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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