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
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[0024] Example 1
[0025] This embodiment is an anode plate protection embodiment of an electroosmotic dehydration device for excess sludge in a sewage treatment plant. The excess sludge enters the electro-osmosis device after the water content reaches 82% after mechanical pressure filtration, and is dehydrated under the action of a DC electric field. The electroosmotic dehydration device used is a batch operation mode (such as the anode plate moving up and down, the sludge horizontal moving electroosmosis device), that is, after the sludge enters between the cathode and the anode plate, both the cathode and the anode plate stop the mechanical movement. After dehydration, when the required moisture content (about 60%) is reached, the anode plate and the cathode are out of contact with the sludge, and the sludge is discharged. At this point, there is no more current flowing through the sludge between the cathode and anode plates. using as figure 2 In the system shown, the a...
Example Embodiment
[0027] Example 2
[0028] This embodiment is basically the same as Embodiment 1, and the energizer 3 uses a sliding varistor. The difference is that the electroosmotic device is a plate-and-frame structure in which the anode plate and the cathode are both 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, and pressure is also applied through the cathode pressurized fluid space 13 for dehydration. When the electro-osmosis reaches the required moisture content, the anode plate and the cathode are out of contact with the sludge, and the sludge is discharged. At this point, there is no more current flowing through the sludge between the cathode and anode plates. When the anode plate is out of contact with the sludge, an electrical circuit is formed between the anode plate 2 and the cathode 4 through an external energizer 3, an...
Example Embodiment
[0030] Example 3
[0031] This embodiment is basically the same as Embodiment 1, the difference is that when the equipment is overhauled or stopped, press figure 2 An external power source is connected between the anode plate and the cathode in the manner shown. In the case of maintenance and other shutdowns, such as more than 2 hours a week, when no external power supply is connected, the dehydration efficiency of the anode plate is significantly reduced after 3.5 months of use. After that, there was a significant decline. The life of the anode plate is significantly extended. And the protection current density on the anode plate is only 1 / 20 of the lowest value in the later stage of electroosmosis.
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