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A kind of dredging mud dewatering method based on mud skin permeability

A mud and mud skin technology, applied in chemical instruments and methods, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of poor mud treatment effect, unmatched dredging volume, and dehydration efficiency Reduce the problem of reducing mud treatment costs, improve mud treatment efficiency, and improve water permeability

Active Publication Date: 2017-06-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies have a series of problems in the treatment of dredged silt: 1. Cyclone separation is not effective in treating mud containing more particles with a particle size of less than 45 microns; 2. The unit processing capacity of the plate and frame filter press is low, and the equipment investment is large , does not match the amount of dredging; the sedimentation of the storage yard occupies a large area and takes a long time period
[0004] At present, there is a vacuum filtration method that uses geotextiles to treat mud with high water content, but because there are many fine particles in the mud, it will immediately cause blockage of the filter cloth during suction filtration, and the dehydration efficiency will decrease rapidly, which is difficult to be used for continuous dredging of large amounts of mud dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present embodiment provides a method for dehydrating dredging mud based on mud skin penetration, wherein the dredging mud is dredged mud from Taihu Lake, and the water content is 900%. The method includes the following steps in turn:

[0025] (a) Take 15.4kg of Taihu Lake dredging mud with a water content of 900% (dry weight 1.54kg), add 7.7g of flocculant PAM to it, stir evenly, and form flocs of about 0.1~0.5mm (the size here refers to average size, the same below);

[0026] (b) Place the surface area of ​​7.07cm in the transition mud (transition mud is the name of the above dredged silt after treatment and flocculation treatment, here is just to distinguish it from the dredged mud above) 2 The surface of the suction filter head is covered with a 400-mesh geotextile, and a vacuum pump is used to apply a negative pressure of 75Kpa to the suction filter head (the pressure of the suction filter remains unchanged during the suction filtration process), and the suction...

Embodiment 2

[0028] The present embodiment provides a method for dehydrating dredging mud based on mud skin penetration, wherein the dredging mud is dredged mud from Taihu Lake, and the water content is 1150%. The method includes the following steps in turn:

[0029] (a) Take 25kg of Taihu Lake dredging mud (dry weight 2kg) with a water content of 1150%, add 0.2kg of iron ion flocculant to it, stir evenly, and form flocs of about 1.0~1.5mm;

[0030] (b) Place a surface area of ​​7.07 cm into the transition mud 2 The surface of the suction filter head is covered with 150-mesh geotextile, and the vacuum pump is used to apply a negative pressure of 105Kpa to the suction filter head to start the suction filtration. The suction filtration speed can reach 0.2g / cm in the initial stage 2 s, after which the suction filtration speed decreases slowly, after 1 hour of suction filtration, the suction filtration speed drops to 0.1g / cm 2 ·s, after 4 hours, the moisture content of the mud drops to 250%. ...

Embodiment 3

[0032] This embodiment provides a method for dehydrating dredging mud based on mud skin penetration, wherein the dredging mud is dredged mud from Taihu Lake, and the water content is 570%. The method includes the following steps in turn:

[0033] (a) Take 20kg of Taihu dredging mud with a water content of 570% (dry weight 3kg), add 0.45kg of a mixture of iron ion flocculant and aluminum ion flocculant to it, and stir evenly to form flocs of 1.5~2mm (here The size refers to the average size);

[0034] (b) Place a surface area of ​​7.07 cm into the transition mud 2 The surface of the suction filter head is covered with 300-mesh geotextile, and the vacuum pump is used to apply a negative pressure of 80Kpa to the suction filter head to start the suction filtration, and the suction filtration speed can reach 0.5g / cm in the initial stage 2 s, after which the suction filtration speed decreased slowly, after 3 hours of suction filtration, the suction filtration speed dropped to 0.15g...

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Abstract

The present invention relates to a dredging mud dewatering method based on mud skin permeation, which comprises the following steps in sequence: (a) adding flocculant to dredging mud to form transition mud containing flocs; (b) using geotextile as filter medium, Suction filtration is performed on the transition mud to form a mud skin on the surface of the geotextile, and the suction filtration is continued to separate the transition mud from mud and water. The present invention is based on the dredging mud dewatering method based on the water permeability of the mud skin. The mud skin produced by the formed flocs in the suction filtration process has good water permeability and can be used for continuous pumping, which can prevent the clogging of the geotextile and allow water to pass through. Continuous dehydration achieves rapid reduction of mud volume, requires a small space, improves mud treatment efficiency, and reduces mud treatment costs.

Description

technical field [0001] The invention relates to a mud dewatering method, in particular to a dredging mud vacuum filtration dehydration method based on mud skin permeation. Background technique [0002] In order to improve the water quality of rivers and lakes and ensure the normal flood discharge capacity and navigation capacity of rivers, large-scale dredging and dredging projects are being carried out in lakes and rivers in our country. These dredging muds have high moisture content and low density, making it difficult to use them directly. [0003] The existing treatment methods include mud-water separation technology through cyclone separation, plate and frame filter press, or sedimentation and storage technology in the stockyard. These technologies have a series of problems in the treatment of dredged sludge: 1. Cyclone separation has poor treatment effect on mud containing more particles with a particle size of less than 45 microns; 2. The unit processing capacity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F11/143C02F11/147
CPCC02F11/143C02F11/147
Inventor 朱伟吴思麟包建平魏代伟张春雷闵凡路
Owner HOHAI UNIV