Electric field synergistic mud dewatering method and its device

A technology of sludge dewatering and electric field, applied in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of difficulty, high economic cost, and large heat consumption.

Inactive Publication Date: 2007-04-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such a high water content has caused great difficulties and high economic costs for the subsequent treatment of sludge, such as incineration, landfill, etc., while sludge drying requires a lot of heat energy, and its cost is higher

Method used

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  • Electric field synergistic mud dewatering method and its device
  • Electric field synergistic mud dewatering method and its device
  • Electric field synergistic mud dewatering method and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] As shown in Figure 1, the dewatered cake 1 first enters the mechanical pressure action area with the movement of the filter cloth of the permeable material layer 2, and the thickness of the mud cake is 2 mm. After advancing for 2 seconds, it enters the electric field and pressure synergistic dehydration area. The metal plate-shaped anode conductor 3 is arranged on the upper side of the mud and the outer side of the filter cloth, and is connected to the positive pole of the DC power supply 6; Negative connection. Conductors can move synchronously with the movement of filter cloth and sludge. On the upper side of the anode conductor 3, the hydraulic equipment of the mechanical pressure device 5 applies thrust to ensure the close contact between the electrode and the filter cloth and sludge, and provides a mechanical pressure of 5000Pa. The DC power supply adopts a continuous voltage regulation method, and the power supply voltage is 5-10V. The water in the sludge passes...

Embodiment 2

[0026] As shown in Figure 2, the dewatered cake 1 first enters the mechanical pressure action zone with the movement of the filter cloth 2 of the permeable material layer, and the thickness of the mud cake is 5mm. After advancing for 5 seconds, it enters the electric field and pressure synergistic dehydration zone. A metal plate-shaped anode conductor 3 is arranged on the upper side of the sludge and the outer side of the filter cloth in this section, and is connected to the positive pole of the DC power supply 6; a metal mesh cathode conductor 4 is arranged on the lower side of the sludge and the outer side of the filter cloth, and is connected to the positive pole of the DC power supply 6. Negative connection of power supply 6. Conductors can move synchronously with the movement of filter cloth and sludge. On the upper side of the anode conductor 3, a thrust is applied by the mechanical pressure device 5 of the pre-compressed spring mechanical device to ensure the close cont...

Embodiment 3

[0028]As shown in Figure 3. The mud cake 1 is placed between the anode conductor 3 of the metal plate and the metal plate-shaped cathode conductor 4 with grooves on the surface, the initial mud cake thickness is 50mm, and there is a gap between the cathode conductor 4 and the mud cake 1 Filter cloth 2. The anode conductor 3 is connected to the positive pole of the DC power supply 6 , and the cathode conductor 4 is connected to the negative pole of the DC power supply 6 . The DC power supply adopts a continuous power supply mode, and the supply voltage is 60-80V. The mechanical pressure of 10000Pa is provided by the hydraulic device 5 . When dehydrating sludge, first apply mechanical pressure for 10 seconds, and then turn on the power switch. Under the synergistic effect of electric field and mechanical pressure, the water in the sludge moves to the cathode conductor 4 and then flows out along the groove on the surface to complete the dehydration process. After the dehydrat...

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Abstract

The present invention relates to a method for sludge dehydration under the synergistic action of electric field and its equipment. Said dehydration method is characterized by that at two sides of sludge cake a negative electrode conductor and a positive electrode conductor are arranged so as to form an electric field, between the above-mentioned two conductors a mechanical pressure is applied, and the water content separated out from negative electrode conductor side can be separated from sludge by means of pervious material. Said equipment for implementing said method includes negative electrode conductor, positive electrode conductor, mechanical pressure device and pervious material layer.

Description

technical field [0001] The invention belongs to sludge dewatering technology, in particular to a method and device for sludge dewatering under the synergistic action of an electric field. Background technique [0002] Sludge includes urban sewage plant sludge, water supply plant sludge, drainage ditch sludge, water dredging sludge, etc. The amount is much larger than the amount of urban domestic waste, and urban sludge contains high pollutant content. Among them, the content of organic matter in the residual sludge of urban sewage plants is 10 times that of urban sewage, and the content of pathogenic microorganisms in dewatered sludge cakes of sewage plants is several orders of magnitude higher than that of municipal solid waste. In addition, all kinds of sludge may also contain heavy metals, highly toxic organic substances and other pollutants. Therefore, the harm that municipal sludge may cause to the environment is serious. [0003] Sludg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 张书廷马德刚
Owner TIANJIN UNIV
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