Aquatic plant in-situ restoration method of eutrophicated water body

A technology for eutrophication and aquatic plants, applied in the field of in-situ restoration of aquatic plants in eutrophic water bodies, can solve the problems of low utilization value of aquatic plants, long restoration effect time, low popularity, etc. The effect of improving water quality and simple management

Inactive Publication Date: 2017-05-10
CHONGQING ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are 61 families and 155 genera of aquatic (including hygrophytic) vascular plants in China, with a total of more than 430 species, but less than 50 species are often studied in the restoration of eutrophic water bodies
However, in practical applications, the use of aquatic plants to restore eutrophic water bodies also has the following problems: the restoration takes a long time, so the popularity is not high; Causes secondary pollution; aquatic restoration plants such as water hyacinth have strong nitrogen and phosphorus enrichment and restoration capabilities, but because of their strong vitality and no natural enemies, they overgrow in water bodies, and the plants are easy to overwinter in winter and difficult to control , easily lead to ecological disaster
At present, there are literature studies reporting the nitrogen and phosphorus absorption capacity of scallops planted in artificially simulated eutrophic water bodies, but there is no technical case of using scallions to restore actual eutrophic water bodies in situ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Daxue in situ restoration of eutrophic reservoirs

[0027] Experiment site: Chenggongqiao Reservoir, Banan District, Chongqing City: Small Type II reservoir, with an area of ​​59336m 2 , storage capacity 320,000 m 3 , the content of main nutrient salts of total nitrogen and total phosphorus are 1.78mg / L and 0.15mg / L respectively, which belongs to eutrophic water body.

[0028] In the subtropical monsoon humid climate area (the specific characteristics are as follows: the annual average climate is around 18°C, and the average minimum temperature in winter is 6-8°C), when the ambient temperature exceeds 10°C, the sage seedlings obtained through division propagation will The specific method is as follows: pull out the mother plant with roots from the overwintering breeding pool, divide it into several small plants with scissors, put each small plant in the eutrophic water body again, rely on the river bank of the water body or the existing dam, use bamboo poles ...

Embodiment 2

[0039] Example 2 In situ restoration of Duck Farm Wastewater by Dale

[0040] Experimental site: Wastewater pool of a small duck farm in Jieshi Town, Banan District. The farm raises 2,000-3,000 ducks per year. Since there are no supporting sewage treatment facilities nearby, the owner of the farm discharges the waste water to a piece of about 500m2 excavated in his own plot. 2 , in a pool with a depth of about 0.3m. The total nitrogen of the wastewater in the pond is 16.7mg / L, the total phosphorus is 12.30mg / L, and the dissolved oxygen is 0. The wastewater is a severely eutrophic water body.

[0041] The restoration period lasted from the end of June to the end of November, and the entire wastewater pond was filled with weeds. After the experiment, it was found that the yield of fenugreek exceeded 114.60kg / m 2 . According to the calculation formula in Example 1, the total nitrogen and phosphorus directly removed by Daxue are about 600.89g / m3 2 、120.32g / m 2 .

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Abstract

The invention discloses an aquatic plant in-situ restoration method of a eutrophicated water body. In the subtropical monsoon moist climate region, when the ambient temperature exceeds 10 DEG C, the restoration plant Pistia is put into the eutrophicated water body and subjected to float planting; by the aid of the riverbank or existing dike of the water body, a bamboo pole fence is adopted to prevent the Pistia from diffuse randomly; the Pistia enriches nitrogen and phosphorus in the water body in the growth process; and the Pistia is periodically salved to indirectly remove the nitrogen and phosphorus eutrophicated substances in the water body, and the salved Pistia plant is recycled. The method has the advantages of obvious nitrogen and phosphorus removal effects; and the salved Pistia plant can be recycled and used as a biomass energy material for biogas fermentation, a raw material for rotting farmyard manure and a raw material for livestock / poultry cultivation feed.

Description

technical field [0001] The invention relates to the technical field of eutrophic water treatment, in particular to an in-situ restoration method for aquatic plants in eutrophic water. [0002] technical background [0003] Eutrophication of water body is caused by the increase of nutrients in water body, causing excessive growth of algae plants and the change of ecological balance of the whole water body, thus causing water pollution. Eutrophication of water body has become a difficult problem in domestic and foreign water pollution control for nearly a hundred years. At present, the general standard for judging the eutrophication of water bodies is: the nitrogen content exceeds 0.2mg / L, and the phosphorus content exceeds 0.01mg / L. [0004] Agricultural non-point sources, such as unorganized discharge of breeding waste, unorganized discharge of domestic sewage, and pesticides and fertilizers sprayed on farmland, are the main reasons for the eutrophication of water bodies in ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F103/20
CPCC02F3/327C02F2103/007C02F2103/20C02F2209/22C02F2301/10C02F2303/20Y02A40/22
Inventor 龚久平杨晓霞张伟李必全柴勇刘剑飞
Owner CHONGQING ACAD OF AGRI SCI
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