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Dewatering method for papermaking sludge

A papermaking sludge and dehydration rate technology, applied in the field of papermaking, can solve the problems of low dehydration efficiency, environmental pollution, waste of resources, etc., and achieve the effect of low moisture content, high calorific value, and small footprint

Inactive Publication Date: 2013-01-02
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sludge mechanical dehydration method can only reduce the water content in the sludge to about 70%, and the large amount of interstitial water contained in the sludge cannot be removed, and the dehydration efficiency is low
At present, most of the sludge from paper mills is directly landfilled after mechanical dehydration, which pollutes the environment and wastes resources.

Method used

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  • Dewatering method for papermaking sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] like figure 1 As shown, it is a schematic structural diagram of an electrodialysis device used for the dehydration method of papermaking sludge provided by the present invention, including a positive cylinder tank 4 and a negative cylinder tank 5 that rotate in opposite directions, and the positive cylinder tank 4 is a mesh structure. , the negative cylindrical groove 5 is a network structure. A slurry tank 6 is provided between the positive electrode cylindrical tank 4 and the negative electrode cylindrical tank 5 .

[0023] The papermaking sludge is placed in the mud tank 6, and after the electric field is introduced, the rotational speed of the positive cylinder tank 4 and the negative cylinder tank 5 are adjusted to 1 rpm, and the current density is 100A / m. 2 , the papermaking sludge passes between the positive cylindrical groove 4 and the negative cylindrical groove 5 along the rotation direction of the positive cylindrical groove 4 and the negative cylindrical gr...

Embodiment 2

[0025] The difference from Example 1 is that the positive cylindrical groove 4 has a net-like structure, and the negative cylindrical groove 5 has a sheet-like structure. The rotational speed of the positive cylindrical tank 4 and the negative cylindrical tank 5 are both 2 rpm, and the current density is 200 A / m 2 , the added amount of the removed wastewater is 3% by weight of the papermaking sludge to be dewatered. The moisture content of the mud cake after dehydration was 35%.

Embodiment 3

[0027] The difference from Example 1 is that the positive cylindrical groove 4 is of a mesh structure, and the negative cylindrical groove 5 is of a mesh structure. The rotational speed of the positive cylindrical tank 4 and the negative cylindrical tank 5 are both 3 rpm, and the current density is 500 A / m 2 , the added amount of the removed wastewater is 5% by weight of the papermaking sludge to be dewatered. The moisture content of the mud cake after dehydration was 30%.

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Abstract

The invention discloses a dewatering method for papermaking sludge. The dewatering method is characterized in that the papermaking sludge is dewatered by an electroosmosis device, and the removed wastewater is added into papermaking sludge to be dewatered, so that the dewatering rate of the electroosmosis can be improved; and the electroosmosis device comprises an positive cylinder groove and a negative cylinder groove which reversely rotate mutually, and the papermaking sludge rotates along the rotation directions of the positive cylinder groove and the negative cylinder groove, and passes between the positive cylinder groove and the negative cylinder groove. According to the dewatering method, the papermaking sludge is dewatered in combination with mechanical dewatering and electroosmosis dewatering, so that the water content of the papermaking sludge can be directly reduced to be less than 39%; the device is small in floor space, so that the position and the technical size can be flexibly changed according to the production requirement; and the treated papermaking sludge can be directly burnt.

Description

technical field [0001] The invention relates to a dewatering technology for papermaking sludge, and belongs to the technical field of papermaking. Background technique [0002] Sludge is the final product of wastewater treatment in the papermaking process. For every ton of recycled paper produced, 700Kg of sludge with a water content of about 65% is produced. The output is 5 to 10 times that of a municipal sewage treatment plant of the same scale. high and difficult to handle. Especially in recent years, the output of paper and cardboard in my country has jumped to the top in the world, so the disposal of paper sludge has become an important issue that restricts the development of paper mills. Studies have shown that papermaking sludge contains rich biomass and organic matter content of about 40% to 50%. , is a biomass resource. After effective treatment of papermaking sludge, it can be turned waste into treasure and become a renewable resource, reducing environmental pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 杨娇吴立群
Owner CHINA HAISUM ENG