The method of water depth adjustment to control the growth of submerged plants to control the eutrophication of lakes

A submerged plant, eutrophication technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Slow recovery and other problems, to save manpower and material resources, increase species diversity, and improve water quality

Inactive Publication Date: 2016-11-23
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to restore aquatic vegetation, especially submerged plants, requires a lot of capital, manpower and material resources, and because the initial survival rate of the planted plants is relatively low, the later maintenance costs are high, and the recovery of plants is relatively slow. Nutritious lake water, the growth period of plants happens to be the period of algal blooms, and the massive reproduction of algae and its environmental effects often make it difficult for submerged plants to survive

Method used

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  • The method of water depth adjustment to control the growth of submerged plants to control the eutrophication of lakes
  • The method of water depth adjustment to control the growth of submerged plants to control the eutrophication of lakes
  • The method of water depth adjustment to control the growth of submerged plants to control the eutrophication of lakes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A small lake is selected as the experimental area. The maximum water depth of the experimental area is 2.4m. The water depth of the experimental area is 0-0.5m for 15%, 0.5-1.0m for 32%, 1.0-1.5m for 33%, and 1.5-2.0m. The area accounts for 15%, the 2.0-2.4m area accounts for 5%, and the experimental area is a water body with severe eutrophication. Plant the hardy plant Potamogeton crispus in November of the first year at a planting density of 100 plants / m 2 In the following seasons, as the temperature decreases, the algae in the eutrophic water body will gradually decay and settle, and the transparency of the water body will gradually increase, which will provide a better living environment for the survival and growth of plants. Therefore, Potamogeton crispus will continue from November to December. Sprouting and growing, the survival rate of plants is higher. Generally, the water body freezes from the end of December to the beginning of March in northern my country. At...

Embodiment 2

[0036] A small artificial pond reservoir is selected as the experimental area. The experimental area is a rectangular pond with a length of 120m and a width of 80m. The bottom of the experimental area is relatively flat, and the surrounding area is built with vertical stones. Therefore, the water depth of the experimental area is 0%, 0.5 -1.0m area accounts for 0%, 1.0-1.5m area accounts for 0%, 1.5-2.0m area accounts for 95%, and 2.0-2.5m area accounts for 5%. The experimental area is a breeding pond for many years, which was later abandoned, and the water body has been eutrophication. Plant the hardy plant Potamogeton crispus in November of the first year at a planting density of 100 plants / m 2 ; Potamogeton crispus will sprout and grow from November to December.

[0037] The water depth was adjusted when the ice on the water surface began to melt in early March of the second year, and the water depth was adjusted by extraction. At this time, the water depth was lowered by 0.5m...

Embodiment 3

[0043] A small lake is selected as the experimental area. The experimental area is rectangular, 250m long and 115m wide. The bottom of the experimental area is relatively flat. The water depth of the experimental area is 0-0.5m for 20%, 0.5-1.0m for 31%, and 1.0-1.5m. The area accounts for 14%, the area 1.5-2.0m accounts for 11%, the area 2.0-2.5m accounts for 4%, the area greater than 2.5m water depth accounts for 20%, and the area greater than 2.5m water depth is relatively concentrated. Eutrophication already exists in the water bodies in the experimental area.

[0044] Plant the hardy plant Potamogeton crispus in November of the first year at a planting density of 100 plants / m 2 ; Potamogeton crispus will sprout and grow from November to December.

[0045] At the beginning of March of the second year, the water depth was adjusted when the ice on the water surface began to melt, and the water depth was adjusted by means of draining the gate. At this time, the water depth was low...

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Abstract

The invention discloses a method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth. The method mainly comprises five steps, namely selecting a critical time point to plant submerged plants, selecting a critical time point to regulate and control the water depth and regulating the planting density of the submerged plants to enable the submerged plants to obtain the maximum biomass and provide such environmental conditions as optimal illumination, water temperature and the like, so as to control eutrophic water bodies more effectively. The method disclosed by the invention is convenient to implement and operate, low in submerged plant colony recover cost, capable of saving manpower and material resources, low in subsequent maintenance cost, high in plant survival rate and good in purification effect.

Description

Technical field [0001] The invention relates to a method for treating lake eutrophication, in particular to a method for controlling lake eutrophication by controlling the growth of submerged plants through water depth adjustment. Background technique [0002] The eutrophication of water bodies is one of the main water environmental problems of the deterioration of water quality. The eutrophication of lakes is the concentration of the natural evolution of lakes caused by the impact of human social activities on the lakes. Almost all lakes are facing the problem of eutrophication and human activities. It exacerbates this process. The main causes of eutrophication are air pollution, urban sewage discharge, excessive use of farmland chemical fertilizers, serious damage to the ecological environment, and aquaculture. The eutrophication of the water body will cause the rapid reproduction of algae and other plankton, the dissolved oxygen of the water body will decrease, the water qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
Inventor 王立志刘前进
Owner LINYI UNIVERSITY
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