In situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents

A submerged plant, in-situ repair technology, applied in water pollutants, biological sludge treatment, chemical instruments and methods, etc., can solve the problem of poor transparency affecting light conditions, unsuitable for submerged plant growth, and low redox potential. problems, to achieve the effect of improving the environment of black and odorous sediment, no secondary pollution of operating costs, and long action period

Inactive Publication Date: 2019-03-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For black and odorous rivers, the nutrient content in the water body is too high, the oxidation-reduction potential is too low, and the transparency is poor, which affects its lighting conditions. I

Method used

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  • In situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents
  • In situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents
  • In situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 - Blank

[0056] No sediment improver was used, and no submerged plants were planted.

Embodiment 2

[0057] Embodiment 2——Spleen grass

[0058] Submerged plants were planted on the 0th day of the experiment, and no sediment improver was added.

Embodiment 3

[0059] Embodiment 3——Smilax + improving agent (0)

[0060] An in-situ repair method for submerged plants-improving agent to jointly improve black and odorous river sediment, comprising the following steps:

[0061] Step 1, put the bottom mud improving agent into the river channel bottom mud, wherein, put 1.875kg bottom mud improving agent per square meter of bottom mud;

[0062] Step 2, after the 0th day (that is, the same day) of putting in the bottom mud improving agent, plant 5 submerged plants in the bottom mud, and the submerged plants are Smilax;

[0063] Step 3: When the height of the submerged plants reaches the surface of the overlying water of the channel, the submerged plants are harvested so that the top of the submerged plants is located below the surface of the overlying water of the channel and 30 cm away from the surface of the overlying water of the channel.

[0064] Step 4, repeat step 3 until the bottom mud turns from dark brown to brownish yellow.

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Abstract

The invention discloses an in situ remediation method for improving black and odorous river sediment by combining submerged plants and improving agents. The method includes the following steps: putting a sediment improving agent in the sediment of a river, and planting submerged plants in the sediment on the 0th - 20th day when the sediment improving agent is put, wherein 1.5-2 kg of the sedimentimproving agent can be put into the sediment per square meter, and the submerged plants are one or more of potamogeton crispus, ceratophyllum demersum and myriophyllum verticillatum; harvesting the submerged plants when the heights of the submerged plants arrive the water surface of the river so that the tops of the submerged plants can be located 25-35 cm below the water surface; and repeating the step 3 until the color of the sediment is changed from dark brown to brown-yellow. The method combines a chemical remediation technology and a bioremediation technology, so that the deficiency of the chemical remediation technology and the bioremediation technology can be made up by integrating the advantages of the two. Black and odorous rivers can rapidly improve the oxygen environments of thesediment by adding the sediment improving agent, so that favorable conditions can be created for the planting of the submerged plants.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment of river polluted water bodies, and in particular relates to an in-situ restoration method for improving black and odorous river sediment by combining submerged plants and improving agents. Background technique [0002] With the rapid development of the economy, a large amount of pollutants produced by people in production and life are discharged into the river. When it exceeds the self-purification capacity of the river, the water quality will deteriorate and black odor will appear. Black and odorous water is an extreme form of organic pollution in water. The mechanism of most black and odorous water bodies is basically the same. It is caused by the lack of oxygen content in the water body, which leads to the reduction of the redox potential of the water body and the corruption of organic matter. When pollutants are discharged into the water body, the pollutants consume a large a...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F11/00C02F101/30C02F103/00
CPCC02F11/00C02F11/02C02F2101/30C02F2103/007
Inventor 迟杰肖凯丽陈浩
Owner TIANJIN UNIV
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