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A kind of environment-friendly dredging dredging method

An environmental protection dredging and silting technology, which is applied in sea area engineering, construction, water conservancy projects, etc., can solve the problems that environmental protection dredging projects cannot achieve the expected results and pollution moves in, so as to prevent mud from spreading, prevent silt from resuspending, and ensure dredging effect of effect

Active Publication Date: 2022-04-19
HANGZHOU XINGYUAN FILTER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the environmental protection dredging system of lakes generally adopts the method of "dredger dredging + pipeline transportation", but due to the resuspension of fine particles during the dredging process of the existing technology, the biological activation and Factors such as the migration of pollution outside the dredging project area have caused some environmental protection dredging projects to fail to achieve the expected results

Method used

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  • A kind of environment-friendly dredging dredging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of embodiment one pretreatment particle 1

[0037] Preparation of protective layer material

[0038] Weigh chitosan powder and add it to 2wt% acetic acid solution, heat to 65°C and stir until completely dissolved to obtain a chitosan solution with a mass concentration of 20 mg / ml, and then dropwise add ammonium sulfate solution, wherein the mass of ammonium sulfate is shell 1% of the mass of polysaccharide, stir and mix evenly, add hydroxypropyl methylcellulose with 3 times the mass of chitosan, stir and mix evenly, put it in a microwave oven at 70W power for 1min, and then react at 210W power for 2h After the reaction is completed, the reactant is washed twice with absolute ethanol, soaked for 3 hours, filtered, dried at 60° C., and pulverized to obtain chitosan-grafted hydroxypropyl methylcellulose.

[0039] Preparation of modified chitosan

[0040] Quaternization: weigh chitosan powder and add it to 2wt% acetic acid solution, raise the temperature t...

Embodiment 2

[0047] The preparation of embodiment two pretreatment granules 2

[0048] The preparation of the protective layer material is the same as in Example 1.

[0049] Preparation of modified chitosan

[0050] Quaternization: weigh chitosan powder and add it to 2wt% acetic acid solution, raise the temperature to 80°C and continue to stir until chitosan is completely dissolved to obtain a chitosan solution with a mass concentration of 25 mg / ml, then weigh 2,3-cyclo Oxypropyltrimethylammonium chloride was added to deionized water and stirred to dissolve, then added to the chitosan solution, and reacted at a constant temperature at 80°C for 10 hours. After the reaction was completed, it was precipitated with absolute ethanol to obtain a white flocculent precipitate, which was vacuum filtered and used After washing with acetone, dry at 60°C to obtain quaternized chitosan;

[0051] Graft modification: Stir and dissolve the prepared quaternized chitosan in 2% acetic acid solution, stir u...

Embodiment 3

[0057] The preparation of embodiment three pretreatment granules 3

[0058] The preparation of the protective layer material is the same as in Example 1.

[0059] Preparation of modified chitosan

[0060] Quaternization: weigh chitosan powder and add it to 2wt% acetic acid solution, raise the temperature to 80°C and continue to stir until chitosan is completely dissolved to obtain a chitosan solution with a mass concentration of 35 mg / ml, then weigh 2,3-cyclo Oxypropyltrimethylammonium chloride was added to deionized water and stirred to dissolve, then added to the chitosan solution, and reacted at a constant temperature at 80°C for 10 hours. After the reaction was completed, it was precipitated with absolute ethanol to obtain a white flocculent precipitate, which was vacuum filtered and used After washing with acetone, dry at 60°C to obtain quaternized chitosan;

[0061] Graft modification: Stir and dissolve the prepared quaternized chitosan in 2% acetic acid solution, stir...

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Abstract

The invention discloses an environment-friendly dredging and dredging method, which relates to the technical field of environment-friendly dredging, and specifically, first removes large-scale garbage in the engineering area, and then dredges a plurality of deep ditches perpendicular to the main wind direction in the sediment accumulation area in the engineering area; The suction pump cleans the suspended flocculent sediment layer on the surface, and after the cleaning is completed, let it stand still for 4-6 hours; slowly and evenly put the pretreated particles into the sludge in the project area, and after putting it in, let it stand for 10-12 hours; The dredger cutter sucks the sludge in the project area, and the sludge sucked out by the cutter is transported through the pipeline for subsequent treatment. The environment-friendly dredging and dredging method of the present invention can effectively reduce the resuspension and secondary diffusion of mud in the dredging process to a certain extent, thereby ensuring the dredging effect.

Description

technical field [0001] The invention relates to the technical field of environmental protection dredging, in particular to an environmental protection dredging and desilting method. Background technique [0002] Environmental dredging technology is one of the measures to control lake pollution sources, and it is developed on the basis of dredging projects such as waterways and inland ports. The difference between environmental protection dredging and engineering dredging is mainly manifested in: environmental protection dredging aims to remove polluted sediments in lake water, create conditions for the restoration of lake water ecosystem, and also needs to be coordinated with comprehensive lake restoration projects; engineering dredging is mainly a project needs, such as channel dredging, capacity expansion, etc. Therefore, environmental protection dredging projects require high dredging precision. During the environmental dredging process, secondary pollution needs to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/02
CPCE02B3/023
Inventor 李洁汪洋李月峰应嘉骏苏园园戴佳亮徐岗
Owner HANGZHOU XINGYUAN FILTER TECH
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