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Heterotopic electro-flocculation device and method

An electro-flocculation and flocculation technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems affecting the contact between the electrode plate and the wastewater, the reduction of electro-oxidation efficiency, and the sticking of the cathode and anode. and other problems, to achieve the effect of reducing the cleaning burden, improving the electrode efficiency, and preventing the passivation of the electrode plate

Active Publication Date: 2015-09-09
中大立信(北京)技术发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, two problems are often encountered in practical applications: one is the plate passivation problem, colloidal substances or organic viscous substances or flocculated sediments in wastewater are easy to deposit on the cathode and anode as sludge, and the cathode and anode are stuck. , if it is not cleaned regularly, it will seriously affect the contact between the electrode plate and the wastewater, and reduce the efficiency of the electrode
The other is the problem of concentration polarization, that is, the superoxide radicals (·O2), H 2 o 2 Active groups such as hydroxyl radicals (·OH) usually only work within a few millimeters from the surface of the electrode plate, and the organic matter contained in the wastewater body outside this distance is actually unable to access these active groups , so are also difficult to be oxidized unless they migrate by diffusion to within a few millimeters of the electrode plate
Both the plate passivation problem and the concentration polarization problem lead to a decrease in the efficiency of electro-oxidation

Method used

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  • Heterotopic electro-flocculation device and method
  • Heterotopic electro-flocculation device and method
  • Heterotopic electro-flocculation device and method

Examples

Experimental program
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Embodiment 1

[0038] use figure 1 The ectopic flocculation electrocoagulation device using solid electrode plates is shown to treat wastewater. The solid electrode plates are iron-aluminum alloy plates, the number of which is 150, and the DC voltage applied between each pair of plates is about 1.5V. And from the gas inlet pipe at the bottom of the tank body 1, the normal pressure CO2 gas is introduced to adjust the pH of the waste water to about 5.8. It was observed in the experiment that only a small amount of flocculation occurred in the electrocoagulation device, which was reflected in the fact that the wastewater only became slightly turbid, but basically no precipitation occurred. The wastewater leaving the electrocoagulation device was passed into another container, which contained a large amount of calcium carbonate particles to increase the pH value, and it was found that a large amount of flocculation and precipitation occurred in this container.

Embodiment 2

[0040] use Figure 6 The shown ectopic flocculation electrocoagulation device using hollow electrode plates is used to treat wastewater. The plates are iron-aluminum alloy plates, the number is 150, and the DC voltage applied between each pair of plates is about 1.5V. Atmospheric pressure CO2 is introduced from the gas inlet 3 of the hollow pole plate, and then passed into the waste water to be treated through the inner cavity and wall holes of the hollow pole plate in turn. The pH of the wastewater was adjusted to about 5.8. It was observed in the experiment that in the electrocoagulation device, only a small amount of flocculation occurred, which was reflected in the fact that the wastewater only became slightly turbid, but basically no precipitation occurred. The wastewater leaving the electrocoagulation device was passed into another container containing some calcium carbonate particles to raise the pH value, and it was found that a large amount of flocculation and sedime...

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Abstract

The invention relates to a heterotopic electro-flocculation device comprising a tank body (1) and at least one pair of electrode plates (2) located inside the tank body (1), wherein the at least one pair of electrode plates (2) are respectively connected with the anode and cathode of a power source; the electrode plate at least connected with the anode of the power source is made of ferrum, aluminum or ferrum-aluminum alloy; and the heterotopic electro-flocculation device is also provided with a gas introducing pipe (5). The invention also relates to a heterotopic electro-flocculation method for realizing heterotopic electro-flocculation on wastewater by using the heterotopic electro-flocculation device, wherein acid gases are introduced to the wastewater through the gas introducing pipe (5). Preferably, the electrode plates in the device disclosed by the invention are hollow electrode plates, and the acid gases are introduced from gas inlets (3) of the hollow electrode plates. The device and method disclosed by the invention can be used for realizing heterotopic flocculation.

Description

technical field [0001] The invention belongs to the field of waste water treatment equipment and treatment technology. Background technique [0002] Flocculation is a common method for treating wastewater. The conventional chemical flocculation method is to add various flocculants to the wastewater, such as polyaluminum chloride, polyferric chloride, polyaluminum ferric sulfate chloride, etc., and the iron ions or aluminum ions in these flocculants are easily hydrolyzed to form hydroxide Iron or aluminum hydroxide, and with the increase of its amount, flocculation and precipitation will occur. During the flocculation and precipitation process, the particulate matter and some adsorbable substances in the wastewater will be transferred to the flocs through adsorption and sweeping, which will play a role to purify wastewater. However, the chemical flocculation method often introduces other anions into the wastewater, such as chloride ions or sulfate ions, and these additional...

Claims

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Application Information

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IPC IPC(8): C02F1/463
Inventor 刘艳尼赵庆晨
Owner 中大立信(北京)技术发展有限公司
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