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Method for treating odors produced by drying sewage sludge

A sewage sludge and treatment method technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as inapplicable treatment methods, and achieve the effects of large operating flexibility, enhanced safety, and stable effects

Inactive Publication Date: 2011-05-25
广州中洲环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above methods can handle the waste and odor gas above 100°C. However, the waste and odor gas generated in the sludge drying process is higher than 100°C, so the existing treatment methods are not applicable
In addition, there are no reports of relevant treatment methods at home and abroad for the treatment of odors above 100 °C produced in sludge drying

Method used

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  • Method for treating odors produced by drying sewage sludge
  • Method for treating odors produced by drying sewage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Clear water is filled in the clear water pool 20 in the pretreatment tower 7 . The mixed solution of sodium hydroxide and sodium hypochlorite is contained in the primary reagent pool 21 in the primary spray pool 12, the pH value is 14, and the available chlorine content is 1 g / L. The dilute sulfuric acid solution with a pH of 0 is filled in the secondary chemical pool 22 in the secondary spray pool 17 . The spray water pump 3 is started, and clean water is continuously sprayed at high speed on the surface of the packing material of the packing layer 6 through the circulating water pipe 2 and the spray nozzle 5 to form a clear water liquid film. Start the spray water pump 10, so that the mixed solution of sodium hydroxide and sodium hypochlorite is atomized into small water droplets through the spray nozzle 11 and sprayed on the surface of the packing material of the packing layer 13 to form a liquid film of the mixed solution of sodium hydroxide and sodium hypochlor...

Embodiment 2

[0036] The difference from Example 1 is:

[0037] The mixed solution of sodium bicarbonate and sodium hypochlorite is filled in the primary agent pool 21 of the primary spray pool 12, the pH value is 9, and the available chlorine content is 5g / L. The dilute sulfuric acid solution whose pH is 3 is filled in the secondary chemical pool 22 of the secondary spray pool 17 .

[0038] The superficial flow velocity of the odor through the pretreatment tower and the spray towers at all levels is 3.5m / s.

Embodiment 3

[0040] The difference from Example 1 is:

[0041] The mixed solution of sodium bicarbonate and sodium hypochlorite is filled in the primary agent pool 21 of the primary spray pool 12, the pH value is 10, and the available chlorine content is 3g / L. The dilute sulfuric acid solution with a pH of 2 is filled in the secondary chemical pool 22 of the secondary spray pool 17 .

[0042] The superficial flow velocity of the odor through the pretreatment tower and the spray towers at all levels is 1.5m / s.

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Abstract

The invention discloses a method for treating odors produced by drying sewage sludge. The method comprises the following steps: (1) delivering odors exhausted by a sewage sludge drying system to a pretreatment tower through a fan to be rinsed with clean water, wherein the components soluble in water in the odors are absorbed by the clean water, and the odors are cooled at the same time; (2) rinsing the pretreated odors in a primary spraying tower, wherein the acid gases and volatile organic compound gases in the odors are subjected to chemical reaction with the spraying solution with strong oxidability and alkalinity in the primary spraying tower and are absorbed; (3) rinsing the remaining gases after treatment in the step (2) in a secondary spraying tower, wherein alkaline gases in the gases are subjected to neutralization reaction with the acid spraying solution in the secondary spraying tower and are absorbed; and (4) exhausting the tail gases after treatment in the step (3) through an exhaust pipe. After the odors produced by drying the sewage sludge are treated by the method disclosed by the invention, the obtained tail gases can reach the secondary emission standard in the Emission Standards for Odor Pollutants (GB14554-93).

Description

technical field [0001] The invention relates to an odor treatment method, in particular to an odor treatment method produced by drying sewage sludge. Background technique [0002] At present, in the sludge disposal strategy of sewage treatment plants, sludge drying treatment technology has been recognized as a safe and reliable treatment method, with low operating costs and easy operation. The sludge treatment produced by this technology can be used as raw materials for cement, raw materials for brick making, foundation engineering filler and landfill cover soil. During the drying and disposal of sludge, the types and forms of pollutants originally present in the sludge change, and are transferred from the solid phase to the gas phase, thus forming a large number of high temperature, high humidity, odor, and high concentration pollutants. Waste gas. The main substances in these waste odor gases are hydrogen sulfide, methyl mercaptan, ethyl mercaptan, toluene, xylene, dimet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/72B01D53/42B01D53/96
Inventor 郑理慎陈志平杨浩文张旭张国松王薇李飞
Owner 广州中洲环保科技有限公司
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