c Types of pressurized flotation tanks The pressurized flotation tanks are rectangular and round. In order to increase the surface load rate, the principle of the inclined plate sedimentation tank is combined with the flotation tank to form a multi-stage pressurized floating tank, as shown in FIG. The standard processing capacity of this multi-stage flotation cell is: three sections of 30 m 3 • hour -1 , six sections of 60 m 3 • hour 1 .
There is no standard series of pressurized flotation equipment in China. There are four types of pressurized flotation tanks in Degremont, France, which have been translated into Chinese (see Water Handbook, Chinese Architecture for details). Industrial Press Publishing).
B Vacuum flotation Flotation flotation is also called vacuum flotation, so that the air is dissolved under normal pressure, and then vacuum is decompressed in a closed tank to cause gas dissolved under normal pressure to precipitate, and Figure 9 is decompression. An example of a flotation cell.
The vacuum flotation is suitable for a flotation process in which odor and harmful gases are volatilized. The disadvantage is that the amount of foaming is limited and requires intermittent operation. [next]
C Electrolytic flotation Electrolytic flotation can also be classified as bubble precipitation flotation. The generation of bubbles is formed by the precipitation of H 2 and O 2 at the cathode and the anode, respectively, during electrolysis.
Cathodic reaction: 2H + + 2e ===H 2
Anodic reaction: 4OH - - 4e ===2H 2 O+O 2
Figure 10 is an illustration of an electrolytic flotation device. An electrode is arranged in the flotation cell, and a low voltage direct current is passed between the two electrodes. In fact, the current density used in the flotation cell surface area calculated about 80 to 90 A / m 2 •, when the gas yield of about 50 to 60 l / m 2 •. The flow rate used is approximately 4 m 3 /h • m 2 .
The anode is particularly sensitive to corrosion, and the cathode is highly susceptible to fouling due to precipitation of carbonate. When it is necessary to apply the protective titanium in order to protect the anode, it is impossible to achieve the purpose of automatic descaling by periodically replacing the electrode. Therefore, chemical pretreatment of the water or periodic descaling of the cathode must be considered.
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