Processing method for discharged exhaust gas in sewage disposal field

A technology for sewage treatment plants and treatment methods, which is applied to the treatment of waste gas discharged from biochemical aeration sewage treatment equipment, and in the field of biochemical treatment equipment for sewage treatment plants. The effect of stable operation and high processing efficiency

Active Publication Date: 2012-03-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, waste gas from sewage treatment plants, especially waste gas from aerated biochemical treatment sewage plants, is treated with fixed bed technology, such as packed bed washing, solid desulfurizer bed desulfurization, and solid adsorbent bed dehydrogenation. The problem that the fixed bed is blocked and cannot be operated for a long period of time is generally considered to be caused by the deposition of solid impurities in the exhaust gas, such as sludge debris, on the fixed bed

Method used

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  • Processing method for discharged exhaust gas in sewage disposal field
  • Processing method for discharged exhaust gas in sewage disposal field

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Effect test

Embodiment 1

[0029] The exhaust gas from the activated sludge aeration tank in the sewage treatment plant of an oil refinery contains 20mg / m sulfide 3 About, hydrocarbons 2~150 mg / m 3 About (normal value is 10 mg / m 3 Below, it will reach 100 mg / m under abnormal working conditions 3 around), the flow rate is 20000Nm 3 / h or so. The spray treatment section uses industrial water and adds a fungicide, the fungicide is commercial isothiazolinone, the fungicide concentration is 0.5mg / L, and the spray liquid-gas volume ratio is 1L / m 3 , the spray treatment uses a packed tower, and the volume space velocity of the packed tower operation is 5000h -1 .

[0030] The activated carbon loaded with sodium hydroxide is used in the desulfurization section (sodium hydroxide accounts for 20% of the weight of the activated carbon by weight), and the volumetric space velocity of the desulfurization section is 8000 h -1 .

[0031] The hydrocarbon concentration homogenization section uses commercially ava...

Embodiment 2

[0036] Waste gas discharged from biochemical aeration tank of a municipal sewage treatment plant, sulfide 5mg / m 3 around, the hydrocarbon concentration is generally 5 mg / m 3 around, sometimes more than 50 mg / m 3 about.

[0037] use as figure 1 In the process flow shown, industrial water is used in the spray pretreatment section, the bactericide is THPS (tetracarboxyalkylphosphorus sulfate, a kind of quaternary phosphorus salt), the bactericide concentration is 50mg / L, and the spray liquid-gas volume ratio is 1L / m 3 , the spray treatment adopts a packed tower, and the volume space velocity of the packed tower operation is 3000h -1 . The temperature of the exhaust gas after the spray washing treatment is 25°C.

[0038] The temperature of the tail gas of the catalytic combustion device is 120°C, and the temperature of the mixed gas mixed with the waste gas from the sewage treatment plant after spraying and washing is 45°C, and enters the desulfurization section.

[0039] T...

Embodiment 3

[0043] According to the process and treatment object of embodiment 2, with dichlorophen as bactericide, the bactericide concentration is 5 mg / L, and the spray liquid-gas volume ratio is 5L / m 3 , the spray treatment adopts a packed tower, and the volume space velocity of the packed tower operation is 2000h -1 . The exhaust gas temperature after the spray scrubbing treatment was 24°C.

[0044] The temperature of the exhaust gas from the catalytic combustion device is 130°C, and the temperature of the mixed gas mixed with the pretreated waste gas from the sewage treatment plant is 38°C, and enters the desulfurization section.

[0045] Activated carbon loaded with sodium hydroxide is used in the desulfurization section (sodium hydroxide accounts for 20% of the weight of activated carbon by weight), and the volumetric space velocity of the desulfurization section is 4000 h -1 .

[0046] The hydrocarbon concentration homogenization section uses commercially available silica gel a...

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Abstract

The invention discloses a processing method for discharged exhaust gas in the sewage disposal field, comprising the following steps of: 1) carrying out spray washing on exhaust gas discharged from the sewage disposal field by using a spray washing liquid with the addition of a bactericide; 2) carrying out desulphurization on the exhaust gas processed from step 1) by using a solid desulfurizer; 3)carrying out hydrocarbon concentration homogenization on the exhaust gas processed from step 2) by using a substance which has a concentration homogenization effect so as to satisfy the discharge requirement. In comparison with the prior art, the method provided by the invention has advantages of high processing efficiency, low cost, stable operation of equipment and the like, and is most suitable for purification treatment of exhaust gas discharged from various biochemical aeration sewage disposal fields.

Description

technical field [0001] The invention relates to a method for treating waste gas discharged from a sewage treatment field, in particular to a biochemical treatment device for a sewage treatment field, especially a method for treating waste gas discharged from a biochemical aeration sewage treatment device. Background technique [0002] Sewage treatment plants are important sewage treatment facilities in oil refineries and municipal facilities. Biochemical treatment technology has the advantages of low cost and good treatment effect, and is an important step in sewage treatment. Among them, aerobic biochemical treatment requires a large amount of air to be introduced into the sewage, coupled with the evaporation of sewage, etc., which will cause the sewage treatment plant to vent to the atmosphere. Emits a lot of exhaust gas. This kind of exhaust gas has a large amount of gas but the concentration of harmful components is low. Under normal circumstances, the concentration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/82B01D53/48B01D53/52B01D47/06B01D53/04
CPCY02P70/10
Inventor 赵日峰刘忠生高跃杜平孙柏军钱进蔡新生
Owner CHINA PETROLEUM & CHEM CORP
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