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Device and method for intensifying aeration by utilizing fine bubbles generated by hydraulic shearing

A technology of fine air bubbles and hydraulic shearing, applied in chemical instruments and methods, biological treatment devices, water aeration, etc., can solve problems such as easy blockage of aeration system, low oxygenation efficiency, low oxygen utilization rate, etc., to achieve Increase dissolved oxygen rate and oxygen utilization rate, low power consumption, and reduce floor space

Active Publication Date: 2021-06-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a device and method for enhancing aeration by using hydraulic shearing to generate fine air bubbles, so as to solve the problem that the aeration system in the prior art is easy to be blocked, easily damaged, low oxygen utilization rate, full Problems and technical defects such as low oxygen efficiency and poor mixing effect

Method used

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  • Device and method for intensifying aeration by utilizing fine bubbles generated by hydraulic shearing
  • Device and method for intensifying aeration by utilizing fine bubbles generated by hydraulic shearing
  • Device and method for intensifying aeration by utilizing fine bubbles generated by hydraulic shearing

Examples

Experimental program
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Effect test

Embodiment 1

[0039] figure 1 It is the device of the present invention that utilizes hydraulic shearing to generate micro-bubbles to enhance aeration, and is used in the aeration tank 1 for biological treatment of wastewater. The device for enhancing aeration includes an aeration core arranged at the bottom of the aeration tank 1 The tube 2 is connected with the aeration core tube 2 through a pipeline, and the blower 3 and the booster pump 4 are placed outside the aeration tank 1 .

[0040] Among them, such as figure 2As shown, the aeration core tube 2 includes a swirl chamber section 21, a throat section 22 and a diffuser section 23 connected in sequence; the swirl chamber section 21 has a spiral cavity structure inside, and the swirl chamber The side wall of chamber section 21 is provided with one or more liquid inlets 25, and the direction of described liquid inlet 25 is tangent to the side wall of described swirl chamber section 21, and the bottom of described swirl chamber section 2...

Embodiment 2

[0061] The device and method described in Example 1 are used to generate micro-bubbles to strengthen aeration by hydraulic shearing, and the aeration is strengthened under different working conditions where the water depth of the aeration tank is 2-4m, 4-6m and 6-8m respectively, and the treatment sewage. The aeration core tube includes a liquid inlet, and the installation direction of the aeration core tube is that the outlet of the diffusion section is upward, and the aeration direction is upward aeration. The specific operating data and achieved effects for different water depths of aeration tanks are shown in the table below.

[0062]

[0063] Under the above operating conditions, the oxygen utilization rate of aeration is in the range of 20%-25%, and on the premise of ensuring that the dissolved oxygen concentration in the aeration tank is 2-5mg / L, the hydraulic retention time is compared with that without the above-mentioned hydraulic retention time. The sheared blas...

Embodiment 3

[0065] Adopt the device described in embodiment 1 to utilize hydraulic shearing to produce fine air bubbles to strengthen aeration, such as Figure 5 As shown, the swirl chamber section of the aeration core pipe is cylindrical, including 3 liquid inlets, and distributed at equal intervals along the section of the swirl chamber section, that is, the angle formed by adjacent liquid inlets is 120° °, the liquid inlet is located at 3 / 4 of the height of the swirl chamber section. The water depth of the aeration tank is 2-4m, the diameter of the liquid inlet is 10mm, the diameter of the air inlet is 8mm, the diameter of the bubble outlet is 15mm, the height of the swirl chamber section is 20cm, the length of the throat section is 3cm, and the angle of the diffusion section is α is 20°.

[0066] Using the method described in Example 1, the booster pump provides liquid feed to the 3 liquid inlets of the aeration core pipe with a working pressure of 0.1Mpa, and the flow rate of each l...

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Abstract

The invention provides a device for intensifying aeration by utilizing fine bubbles generated by hydraulic shearing. The device comprises an aeration core pipe, an air blower and a booster pump, the aeration core pipe comprises a rotational flow cavity section, a throat pipe section and a diffusion section which are connected in sequence; the interior of the rotational flow cavity section is of a spiral cavity structure, a liquid inlet tangent to the rotational flow cavity section is formed in the side wall, an air inlet is formed in the bottom, and a bubble outlet is formed in the top. The invention further provides a method for intensifying aeration by utilizing hydraulic shearing, liquid enters the rotational flow cavity section in the tangential direction to do high-speed rotational flow motion, gas enters from the bottom and is subjected to directional momentum shearing by the high-speed rotational flow fluid to generate a fine bubble group, and then the fine bubble group is further fragmented through the throat pipe section and the diffusion section to enhance aeration. According to the device and the method, the problems of blockage, damage and the like of a conventional microporous aeration device can be avoided, the service life is long, micron-sized fine bubbles can be generated, the oxygenation efficiency and the oxygen utilization rate are increased, sludge suspension is kept, the hydraulic retention time is shortened, and the sewage treatment efficiency is improved.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a device and a method for enhancing aeration by using hydraulic shear to generate fine air bubbles. Background technique [0002] Biological wastewater treatment is a method of using microbial metabolism to decompose degradable organic matter in wastewater, thereby purifying water. Due to its advantages of large processing capacity, small investment, and economical reliability, it is currently the most common water treatment method. Among them, the treatment effect of the widely used aerobic biological method is often restricted by the aeration performance in the aeration tank. The main parameters of the aeration performance include the energy consumption of the aeration equipment, oxygenation capacity, oxygen utilization rate and sludge suspension. degree etc. Micro-bubbles have the characteristics of large specific surface area, high gas holdup, slow rising spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F7/00C02F1/24
CPCC02F3/1284C02F7/00C02F1/24C02F2201/002C02F2201/005C02F2203/006C02F2209/22Y02W10/10
Inventor 杨强王威许萧王俊杰王硕
Owner EAST CHINA UNIV OF SCI & TECH
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