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Multi-stage circulating aerating tower

A technology of aeration and aeration head, applied in sustainable biological treatment, water/sludge/sewage treatment, biological water/sewage treatment, etc. Uneven three-phase mixing and other problems, to achieve the effect of small footprint, reduced footprint and long residence time

Inactive Publication Date: 2002-07-24
TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Its main disadvantages are: the aeration tank covers a large area, and the gas discharge after aeration causes secondary pollution; the three-phase mixing of activated sludge, air and sewage during the aeration process is uneven, the oxygen transfer rate is slow, and the oxygen utilization rate is low. Not high, so the aeration efficiency is low

Method used

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  • Multi-stage circulating aerating tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The circulation aeration tower is made of borosilicate glass, and the inside is equipped with a multi-stage guide tube. Flow tube, sewage is phenol-acetone industrial sewage, mainly contains phenol, acetone, acetophenone and benzyl alcohol, etc., COD is 1000mg / l, adopts continuous operation at room temperature, the concentration of activated sludge is 3-6g / l, sewage The residence time in the tower is 4-6 hours. The COD of the treated water is reduced to 122-166, and the COD removal rate is 83.4-87.8%.

Embodiment 2

[0025] Embodiment 2: the circulation aeration tower is the same as embodiment 1, the sewage is polyolefin catalyst workshop sewage, COD is 1000mg / l, adopts continuous operation under room temperature, the concentration of activated sludge is 3-6g / l, the sewage in the tower The residence time is 2-4 hours. The COD of the treated water is reduced to 50-60. The COD removal rate is 94-95%.

Embodiment 3

[0026] Embodiment 3: The size of the multi-stage circulation aeration tower is: the height of the tower is 1.5 meters, the diameter of the tower body is 15 centimeters, a guide tube is arranged inside, the sewage is petrochemical comprehensive wastewater, and the COD is 1000 mg / l. Continuous operation at room temperature, the concentration of activated sludge is 3g / l, and the residence time of sewage in the tower is 6 hours. The COD of the treated water is reduced to 200. COD removal rate is 80%.

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Abstract

A multi-stage ring-current aerating tower is composed of a main body, enlarged upper segment, coaxially arranged multi-stage guide barrels, and aerating head under said guide barrels. Its advantages are high fluid mechanics performance, high transfer rate of oxygen, and less floor area (decreased by 50%).

Description

technical field [0001] The invention relates to a multi-stage circulation aeration tower, which can be widely used in the treatment of various industrial and urban wastewater, and belongs to the technical field of environmental engineering and industrial and urban wastewater treatment. Background technique [0002] At present, industrial urban sewage is mainly treated by activated sludge method. The activated sludge method is a biological treatment method that uses the biological process of aerobic microorganisms to treat sewage. Usually, the sewage treatment process of activated sludge method is divided into two steps: first, aeration, that is, under aerobic conditions, activated sludge absorbs, absorbs, oxidizes and decomposes organic matter in sewage to convert it into stable inorganic matter; Activated sludge and water are separated in the sedimentation tank to achieve sludge concentration. In the traditional activated sludge sewage treatment, the above two processes a...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 丁富新袁乃驹范轶王麒刘铮
Owner TSINGHUA UNIV
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