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Environment-friendly dredging and desilting method

An environmental protection dredging and silting technology, which is applied in water conservancy projects, sea area engineering, river regulation, etc., can solve the problems of pollution migration and environmental protection dredging projects can not achieve the expected results, and achieve the effect of reducing the spread of silt and reducing costs

Active Publication Date: 2020-12-01
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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  • Environment-friendly dredging and desilting 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, then add ammonium sulfate solution dropwise, 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, heat up to 80°C and continu...

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, heat up 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] Grafting modification: Stir and dissolve the prepared quaternized chitosan in 2% acetic acid solution, stir until comple...

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, heat up 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] Grafting modification: Stir and dissolve the prepared quaternized chitosan in 2% acetic acid solution, stir until comp...

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Abstract

The invention discloses an environment-friendly dredging and desilting method, and relates to the technical field of environment-friendly dredging. The environment-friendly dredging and desilting method specifically comprises the steps that large garbage in an engineering area is removed firstly, and a plurality of deep ditches perpendicular to the main wind direction is dredged in a sediment accumulation area in the engineering area; a flocculent sediment layer suspended on a surface layer is cleared by using a suction pump, and still standing is conducted for 4-6 hours after clearing is completed; pretreated particles are slowly and evenly put into engineering area sludge, and still standing is conducted for 10-12 hours after putting is completed; the sludge in the engineering area is cut and sucked through a cutter suction dredger, and the cut-sucked sludge is conveyed through a pipeline to be subjected to follow-up treatment. According to the environment-friendly dredging and desilting method, slurry resuspension and secondary diffusion in the desilting process can be effectively reduced to a certain extent, and therefore the desilting effect is guaranteed.

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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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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