Method for treating eutrophication water body by hydrophyte

A technology of aquatic plants and eutrophication, applied in the direction of sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as restoration of water bodies that cannot be eutrophicated, difficult to recycle, secondary pollution of plants, etc. Achieve the effects of low construction and operation management costs, good economic feasibility, and broad application prospects

Inactive Publication Date: 2008-04-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the purification plants are not properly selected, not only can the eutrophic water body not be repaired, but also cause secondary pollution due to the crazy growth of plants
At present, the existing purification methods are roughly divided into two categories: one is to use large aquatic plants (water peanuts, water hyacinths, macroalgae, etc.) to purify nitrogen and phosphorus sewage. , it is difficult to remove it in time by simple mechanical methods, it takes a lot of manpower, and it is easy to stir the sediment during removal, so there is a problem of secondary pollution; and it is multi-f

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] The effect of this patent on the treatment of anaerobic digestion liquid of a pig farm in the suburbs of Nanjing under winter weather conditions (take Nanjing as an example) was investigated. In this experiment, two square plexiglass containers with a side length of 50 cm were used as the processing device, one for the experiment and the other for the control. Add the anaerobic digestion liquid of the pig farm to the treatment device, the water depth is 40cm, and the healthy duckweed, water peanut, and water hyacinth (taken from the laboratory amplification tank) are added to the experimental device. The fresh weight is 75g, 25g and 40g, the water surface coverage is 60%, 10% and 10%, and the stocking density is 0.5kg / m 2 , 1.0kg / m 2 And 1.6kg / m 2 , The control device did not add aquatic plants, and the two treatment devices were placed in an outdoor natural environment for one month. The experimental results showed that the chemical oxygen demand of the ...

Example Embodiment

[0020] Example 2

[0021] The effect of this patent on the treatment of eutrophic Xuanwu Lake water in Nanjing under summer weather conditions (take Nanjing as an example) was investigated. In this experiment, two square plexiglass containers with a side length of 50 cm were used as the processing device, one for the experiment and the other for the control. Add the eutrophic Xuanwu Lake water to the treatment device with a water depth of 40cm. Add healthy duckweed (taken from the laboratory scaled-up cultivation water tank) to the experimental device. The fresh weight dosage is 40g, the water surface coverage rate is 80%, and the stocking density 0.2kg / m 2 , The control device did not add aquatic plants, and the two treatment devices were placed in an outdoor natural environment for one month, during which duckweed was harvested every 3 days, and the harvest was 20% of the total biomass. The experimental results showed that the chemical oxygen demand of the experimental device de...

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PUM

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Abstract

This invention relates to a method for purifying eutrophic water body by using water plant, particularly duck-weed and polycultured with other water plants. The adsorption, absorbing and biochemical reaction of said water plants are used for removing nitrogen, phosphorus and other pollutants. The plants occupies 70-90% of the surface of the water body. This invention has advantages of: simple operation, low management cost, obvious treatment effect, no secondary pollution, the water plants can be harvested as resource, being of a popularized treatment method for eutrophic water body.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for treating eutrophic water bodies by utilizing aquatic plants, in particular to an aquatic plant treatment technology mainly based on duckweed, an aquatic floating plant. Background technique [0002] In recent years, due to the continuous growth of population and the rapid development of industry and agriculture, a large amount of nutrient-rich sewage is directly discharged into various water bodies without any treatment, resulting in accelerated eutrophication process. The eutrophication of lakes and reservoirs has become a prominent environmental problem in our country. [0003] Comprehensive approaches and countermeasures for the prevention and control of eutrophication in recent years can be summarized as: physical methods, chemical methods and biological / ecological methods. Compared with physical and chemical methods, the biological / ...

Claims

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Application Information

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IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 徐炎华蔡冬蓉黄辉刘杰
Owner NANJING UNIV OF TECH
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