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Treatment method for waste gas discharged from sewage farm

A technology of sewage treatment plant and treatment method, which is applied in the field of waste gas treatment of sewage treatment plant biochemical treatment equipment and biochemical aeration sewage treatment equipment, and can solve problems such as unstable operation and large-scale adsorption equipment

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to be combined with the catalytic combustion treatment of other high-concentration organic waste gases, and the adsorption device has the disadvantages of large scale and unstable operation.

Method used

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  • Treatment method for waste gas discharged from sewage farm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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. use as figure 1 In the process flow shown, industrial water is used in the spray pretreatment section, and the liquid-gas volume ratio is 1L / m 3 . The temperature of the exhaust gas after treatment in the spray pretreatment section is 28°C.

[0021] The temperature of the tail gas of the catalytic combustion device is 120°C, and the temperature of the mixed gas after mixing with the pretreated waste gas from the sewage treatment plant is 40°C, and enters the desulfurization section.

[0022] 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...

Embodiment 2

[0028] Exhaust gas from a biochemical aeration tank in a petrochemical 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.

[0029] use as figure 1 In the process flow shown, industrial water is used in the spray pretreatment section, and the liquid-gas volume ratio is 0.5L / m 3 . The temperature of the exhaust gas after treatment in the spray pretreatment section is 25°C.

[0030] The temperature of the tail gas of the catalytic combustion device is 120°C, and the temperature of the mixed gas after mixing with the pretreated waste gas from the sewage treatment plant is 45°C, and enters the desulfurization section.

[0031] The desulfurization section uses iron oxyhydroxide desulfurizer (prepared according to the method described in CN200810112428.X Example 1), and the volume space velocity of the desulfurization section is 1000 h -1 .

[0032] The hydrocarbon concentration homog...

Embodiment 3

[0035] According to the process and treatment object of Example 1, only the spraying pretreatment section is canceled, and the temperature of the waste gas discharged from the sewage treatment plant is 31°C.

[0036] The temperature of the exhaust gas from the catalytic combustion device is 120°C, and the temperature of the mixed gas mixed with the pretreated waste gas from the sewage treatment plant is 42°C, and enters the desulfurization section.

[0037] 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 5000 h -1 .

[0038] The hydrocarbon concentration homogenization section uses commercially available hydrophobic silica gel as the concentration homogenization material, and the volume space velocity of the hydrocarbon concentration homogenization section is 2000 h -1 .

[0039] The long-ter...

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Abstract

The present invention discloses a treatment method for waste gas discharged from a sewage farm, including the following steps of: heating up waste gas discharged from a sewage farm for a temperature rise of 2 to 40 DEG C, and discharging via a desulfurization section and a hydrocarbon concentration homogenization section. A solid desulfurizing agent is used in the desulfurization section, and a substance having a concentration homogenization effect is used in the hydrocarbon concentration homogenization section. Compared with the prior art, the method of the present invention has the advantages of high treatment efficiency, low cost, and stable operation of an apparatus, so the method is the most suitable for purification treatment of the waste gas discharged from various biochemical aeration sewage farms.

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 and other reasons, causing sewage treatment plants to discharge a large amount of water into the atmosphere. 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/14B01D53/82B01D53/48B01D53/72
Inventor 刘忠生王新陈玉香
Owner CHINA PETROLEUM & CHEM CORP
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