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Method and device promoting gas dissolution through subaqueous aeration

A gas and aeration technology, applied in water aeration, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of increased maintenance and replacement frequency, aeration blockage, high cost of oxygen supply, etc., to achieve extended Dwelling time, not easy to clog, obvious effect

Inactive Publication Date: 2007-12-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient air supply in water or increased air consumption and increased costs
Similarly, in other biological reactions, such as food and pharmaceutical industries, there will be a problem of high oxygen supply costs
Although researchers have developed various types of aeration devices in order to improve the aeration effect, if micro-bubbles are passed into the water, the pressure loss is large, the aeration part is prone to blockage, and the frequency of maintenance and replacement increases, resulting in increased costs
In addition, even small bubbles will aggregate into large bubbles during their ascent, which will reduce the gas-liquid mass transfer effect

Method used

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  • Method and device promoting gas dissolution through subaqueous aeration
  • Method and device promoting gas dissolution through subaqueous aeration

Examples

Experimental program
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Effect test

Embodiment 1

[0022] As shown in Figure 1, the air enters the aeration head 3 installed in the sewage treatment tank 2 through the air pipe 1 to form small air bubbles 4, which rise gradually in an approximate straight line. After encountering the air bubble guide plate 5-a arranged at 1.8 meters above the aeration head, turn to rise in a curve along the guide plate. After rising beyond the upper edge of 5-a, it rises straightly, and when it meets the airflow guide plate 5-b, it turns to rise in a curve along the guide plate. After further rising beyond the upper edge of 5-b, it rises straightly again, and when it encounters the airflow guide plate 5-c, it turns to rise in a curve along the guide plate. After rising beyond the upper edge of 5-c, it rises in a straight line until it emerges from the water 6. In addition, when the bubbles encounter the guide plate, except for some of the bubbles turning to curve upward, the other part of the bubbles pass through the pores of the plate and be...

Embodiment 2

[0024] Figure 2 is a schematic diagram of gas-liquid flow near a bubble deflector. The air bubble guide plate is composed of a plurality of slats in a stepped combination, and there are gaps between each slat, and the distance between the gaps is 30 mm. When the bubble 4 rises and encounters the guide plate 7, it is resisted and becomes a bubble in a curved motion. Due to the deflection of the bubbles, a low-pressure area is formed, which attracts local liquid 8 to flow to the bubble area, forming local mixing of gas and liquid, promoting gas-liquid contact, and increasing gas-liquid mass transfer. In addition, when the bubbles encounter the guide plate, except for some of the bubbles turning to curve upward, the other part of the bubbles pass through the pores of the plate and become rising bubbles. Because the large bubbles are broken when the bubbles pass through the guide plate, the surface area of ​​the gas-liquid contact is increased. At the same time, the distribution...

Embodiment 3

[0026] Fig. 3 is a schematic diagram of gas-liquid flow near another bubble deflector. The bubble guide plate is an upwardly inclined curved panel with long slits, and the distance between the slits is 20 mm (it can also be composed of multiple slats, and there are gaps between each slat. plates do not overlap). When the bubble 4 rises and encounters the guide plate 9, it is resisted, and a part becomes the bubble of the curved motion. The other part passes through the plate holes as rising bubbles. The trajectory of the bubbles moving in a curved line is similar to that of the bubbles in Example 2. The rising air bubbles passing through the plate holes increase the surface area of ​​the gas-liquid contact because the large air bubbles are broken when the air bubbles pass through the guide plate. At the same time, the distribution range of the bubbles is expanded, the gas-liquid contact is promoted, and the gas-liquid mass transfer is increased.

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Abstract

The invention discloses a method to aerate in water to promote the gas dissolution. Wherein, arranging a device on top of aeration head to guide air bubble curved ascend and increase the ascend path and contact time, and breaking up the bubble to increase the contact area to promote dissolution. The opposite device comprises a stainless metal or polymer bubble guide plate with uptill curve plate with hole or strip slot or uptill ladder-array strip plate on top.

Description

technical field [0001] The invention relates to a method and a device for promoting gas dissolution by aeration in water, belonging to the air aeration technology in the field of water treatment. Background technique [0002] A large amount of wastewater is discharged in various industrial processes and living activities. The most common application is microbial treatment, and the microbial treatment process needs to consume oxygen. Therefore, aeration into water is one of the important methods. In the aeration process, although the air coming out of the aeration head of the aeration device is tiny bubbles, they quickly aggregate to form large bubbles during the ascent process, which reduces the surface area for gas-liquid mass transfer and reduces the flow of oxygen into the water. mass transfer speed. In addition, since the air bubbles rise approximately in a straight line after being ejected from the aerator head, they are released from the water in the shortest distance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F7/00
CPCY02W10/10
Inventor 张书廷
Owner TIANJIN UNIV
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