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Direct-current separation anode plate protection method and device

An anode plate and direct current technology, applied in chemical instruments and methods, electrochemical sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of reducing dehydration effect and performance degradation, so as to improve the effect and improve the service life , to avoid the effect of performance degradation of the anode plate

Active Publication Date: 2018-12-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of electroosmosis operation, external factors such as sludge corrosion, electrochemical degradation, and mechanical pressure filtration will degrade the anode and lead to a sharp decline in performance, thereby reducing the dehydration effect.
Among them, intermittent power supply is an important factor leading to its performance degradation. In actual engineering, the interruption of power supply is inevitable. Therefore, alleviating the performance degradation of the anode plate caused by intermittent power supply has become an important technical problem to improve the life of the anode plate.

Method used

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  • Direct-current separation anode plate protection method and device
  • Direct-current separation anode plate protection method and device
  • Direct-current separation anode plate protection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is an embodiment of protecting the anode plate of the electroosmotic dehydration device for excess sludge in a sewage treatment plant. After mechanical press filtration, the remaining sludge has a water content of 82%, and then enters the electroosmosis device, where it is dehydrated under the action of a direct current electric field. The electroosmotic dehydration device adopted is a batch operation mode (such as the anode plate moves up and down, and the sludge moves horizontally, that is, after the sludge enters between the cathode and anode plates, both the cathode and anode plates stop mechanical movement. Dehydration is carried out, and when the required water content (about 60%) is reached, both the anode plate and the cathode are out of contact with the sludge, and the sludge is discharged. At this time, no current flows through the sludge between the cathode and anode plates. use as figure 2 In the system shown, the anode plate 2 moves up an...

Embodiment 2

[0028] This embodiment is basically the same as Embodiment 1, and the electric device 3 is a sliding rheostat. The difference is that the electroosmosis device is a plate-and-frame structure in which the anode plate and the cathode are vertically arranged, such as image 3 shown. After the sludge (not shown in the figure) enters between the anode plate 2 and the cathode 4, a DC electric field is applied between the cathode and the anode while pressure is applied through the cathode pressurized fluid space 13 for dehydration. When the electroosmosis reaches the required water content, the anode plate and the cathode are out of contact with the sludge and the sludge is discharged. At this time, no current flows through the sludge between the cathode and anode plates. After the anode plate is out of contact with the sludge, an electric circuit is formed between the anode plate 2 and the cathode 4 through an external power supply 3 and a wire 5 connected to the power supply 1 , a...

Embodiment 3

[0031] This embodiment is basically the same as Embodiment 1, the difference is that when the equipment is overhauled or shut down, press figure 2 In the shown mode, an external power supply is connected between the anode plate and the cathode. There are many production shutdowns such as maintenance, such as more than 2 hours a week, when no external power is connected, the dehydration efficiency of the anode plate will drop significantly after 3.5 months of use, and the method for protecting the anode plate of the present invention will be in 1.5 years. began to decline significantly. The life of the anode plate is significantly extended. And the protective current density on the anode plate is only equivalent to 1 / 20 of the lowest value in the later stage of electroosmosis.

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Abstract

The invention aims to provide a direct-current separation anode plate protection method and device. The method is characterized in that under the condition that no material is used for conducting electricity between a cathode plate and an anode plate, the cathode plate and the anode plate are electrified through an electrifying device which is additionally connected between the cathode plate and the anode plate so that the cathode plate and the anode plate can be in a power-on state through the electrifying device, the anode plate is protected, and then the service life of the anode plate is prolonged. According to the device, the original equipment and materials do not change, only through the externally-connected electrifying device, the size of the current is regulated, the power supply, the cathode plate and the anode plate are connected, then the anode plate is always in a power-on state, the aim of prolonging the service life of the anode plate is achieved, and the direct-currentseparation anode plate protection method and device is the high-efficiency, easy-to-operate and low-cost anode plate protection method and device.

Description

technical field [0001] The invention relates to an anode plate protection method and device for direct current separation, belonging to the fields of solid-liquid separation, ion separation and environmental protection. Background technique [0002] The excess sludge discharged from the sewage biological treatment system has a high water content and a large volume. Therefore, before the sludge is disposed of, it must be dehydrated to reduce the volume of the sludge as much as possible, thereby reducing the subsequent transportation and disposal costs. . However, the mainstream mechanical dehydration technology can only reduce the moisture content of sludge to about 80%, which cannot meet the requirements for landfill, agricultural and incineration. The electro-osmosis technology can further reduce the moisture content of sludge from about 80% to about 60%. Electroosmosis is under the action of an electric field, the negatively charged sludge particles will move to the anod...

Claims

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Application Information

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IPC IPC(8): C23F13/10C23F13/20C02F11/12C02F11/00
CPCC02F11/006C02F11/12C23F13/10C23F13/20
Inventor 张书廷张聪聪
Owner TIANJIN UNIV
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