CN113713589A - Advanced treatment method of high-sulfur ammonia organic waste gas - Google Patents
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Abstract
The invention discloses a method for deeply treating high-sulfur ammonia organic waste gas, which belongs to the technical field of waste gas treatment and disposal, has wide application range and good deodorization effect and stability, and comprises the following steps: (1) collecting waste gas; (2) the waste gas is chemically washed by a washing tower; (3) removing impurities from the waste gas through a biological trickling filter; (4) the waste gas enters the microporous ultraviolet light catalysis equipment to degrade organic components, microorganisms and bacteria in the waste gas; (5) the exhaust gas passes through activated carbon to adsorb residual components.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment and disposal, and particularly relates to a deep treatment method of high-sulfur ammonia organic waste gas.
Technical Field
The high-sulfur ammonia organic waste gas, namely the malodorous gas, not only brings discomfort to smell, but also causes functional diseases such as anorexia, insomnia, memory decline, dysphoria and the like after being used in a malodorous polluted environment for a long time. The sources of malodorous gases comprise sewage and garbage treatment, chemical production, livestock and poultry breeding and the like, wherein the problems of malodorous pollution in a sewage treatment system and a municipal sludge treatment link are particularly prominent, and environmental complaints caused by the malodorous pollution of sewage plants occur due to the fact that most sewage plants have no deodorization measures or have imperfect deodorization facilities.
At present, the traditional treatment method of high-sulfur ammonia organic waste gas is a single process: natural plant liquid deodorization technology, adsorption method, chemical washing, biological deodorization, ion method, advanced oxidation method, etc., namely only one treatment method is arranged in the waste gas treatment system; the single-process deodorization method is suitable for the working conditions of small air quantity, low odor concentration and single odor component, and the single-process treatment technology is easily influenced by pollution load, component change, unstable working conditions and external environment temperature.
Disclosure of Invention
In order to solve the problems of limited applicable environment and poor stability of the existing single deodorization process, the invention provides a deep treatment method of high-sulfur ammonia organic waste gas, which has wide application range and good deodorization effect and stability.
The technical scheme is as follows: the advanced treatment method of the high-sulfur ammonia organic waste gas is characterized by comprising the following steps:
(1) collecting waste gas;
(2) the waste gas is chemically washed by a washing tower;
(3) removing impurities from the waste gas through a biological trickling filter;
(4) the waste gas enters the microporous ultraviolet light catalysis equipment to degrade organic components, microorganisms and bacteria in the waste gas;
(5) the exhaust gas passes through activated carbon to adsorb residual components.
The method is further characterized in that in the step (1), the waste gas is subjected to space ventilation and collection, and is sent to a subsequent treatment process through space negative pressure;
in the step (2), the washing tower comprises an alkaline washing tower with an absorption solution of sodium hydroxide solution and an acid washing tower with an absorption solution of sulfuric acid solution, the pH value of the sodium hydroxide solution is more than or equal to 9.5, the pH value of the sulfuric acid solution is less than or equal to 3, the waste gas passes through the alkaline washing tower and then passes through the acid washing tower, and thioether waste gas, acidic gas and amine waste gas are removed;
in the step (3), the filler in the biological trickling filter comprises pine bark, volcanic rock, multi-surface hollow spheres and suspended filler, and when the waste gas passes through the biological trickling filter, the waste gas is adsorbed and absorbed by circulating liquid and microorganisms attached to the surface of the filler, so that impurities in the waste gas are removed;
in the step (4), the microporous ultraviolet light catalytic equipment uses an ultraviolet lamp for photocatalytic oxidation.
After the method is adopted, the waste gas is treated by a combination of various treatment processes, so that the treatment efficiency and treatment load of high-concentration ammonia gas and hydrogen sulfide are greatly improved, the method has the advantages of coping with complex waste gas components and unstable working conditions, the high-sulfur ammonia organic waste gas is ensured to reach a higher removal rate after being treated, and the stability is high.
Drawings
FIG. 1 is a schematic diagram of the processing technique of the present invention.
Detailed Description
As shown in figure 1, the advanced treatment method of the high-sulfur ammonia organic waste gas comprises the following steps:
(1) collecting waste gas: after space ventilation and collection, the waste gas is sent into the combined waste gas treatment system through space negative pressure, and most of peculiar smell is ensured not to be emitted to structures and the space outside the sealing cover;
(2) the waste gas is chemically washed through a washing tower: the washing tower comprises an alkaline washing tower and an acid washing tower, wherein the absorption liquid is sodium hydroxide solution, the absorption liquid is sulfuric acid solution, the pH value of the sodium hydroxide solution is more than or equal to 9.5, the pH value of the sulfuric acid solution is less than or equal to 3, the waste gas firstly passes through the alkaline washing tower and then passes through the acid washing tower to remove thioether waste gas, acid gas and amine waste gas, the packing in the washing tower is phi 50 PP multi-surface hollow spheres, and the flow rate of water in the tower is as follows: 100m3The residence time of the waste gas in each tower is more than or equal to 2.2 s;
(3) removing impurities in the waste gas through a biological trickling filter: the filler in the biological trickling filter comprises pine bark, volcanic rock, polyhedral hollow spheres and suspended filler, when the waste gas passes through the biological trickling filter, the waste gas is adsorbed and absorbed by circulating liquid and microorganisms attached to the surface of the filler, so that complex components in the waste gas are removed, the retention time of the waste gas is more than or equal to 25s, and the flow of a water pump is 65 m3/h；
(4) And (3) degrading waste gas entering the microporous ultraviolet light catalytic equipment: the appearance size of the microporous ultraviolet light catalytic equipment is 6.5m multiplied by 2.4m, 216 ultraviolet light lamps are arranged in the microporous ultraviolet light catalytic equipment, the power of the ultraviolet light lamps is 75-87 w, the gas retention time is more than or equal to 1s, the installed power is 13kw, waste gas enters the microporous ultraviolet light catalytic equipment, and organic components, microorganisms, bacteria and the like in the waste gas are degraded through a high-level oxidation process;
(5) adsorbing residual components of the waste gas through activated carbon: the residual waste odor treated by the front-end waste gas treatment facility is adsorbed in the activated carbon micropores through the adsorption effect of the activated carbon, is removed through physical adsorption and is used as the subsequent treatment of the whole set of waste gas treatment device, and the gas retention time is more than or equal to 2 s.
The invention has the advantages that: (1) the combined type deep waste gas treatment system is suitable for treating the field conditions of large waste gas treatment capacity, high organic substance concentration, complex and various components and unstable working conditions, and ensures that the high-sulfur ammonia organic waste gas achieves higher removal rate after being treated by the system; (2) compared with a single-process waste gas treatment process, the combined type deep waste gas treatment system greatly improves the treatment efficiency and treatment load of high-concentration ammonia gas and hydrogen sulfide, and has the advantages of coping with complex waste gas components and unstable working conditions; (3) compared with the common combined process for treating the waste gas, the combined process not only can deal with more complex waste gas components, but also improves the treatment efficiency and load of the waste gas, can be flexibly operated according to working conditions, adjusts the process to adapt to the fluctuation of the gas components while not influencing the treatment effect, and reduces the operation cost; (4) the method utilizes 4 waste gas treatment processes for combined treatment, and carries out sectional treatment on waste gases with different components, so that the method can remove high-sulfur ammonia organic gas, and the odor concentration removal rate of other complex components can also reach 91.4%.
The following are specific examples:
a certain municipal sludge drying treatment plant mainly treats municipal sludge and blue algae sludge, a rotary steam sludge drying machine is used for treating dry sludge with the water content of about 60%, the water content of the treated sludge is reduced to about 35%, and organic waste gas generated in the drying process is treated by the treatment method.
The main components of the dried organic waste gas are ammonia gas, hydrogen sulfide and other odor components, and the design of the waste gas treatment system is that the inlet air volume is 40000 m3H, feed gas component concentration: ammonia gas 133.2 mg/m335.0 mg/m of hydrogen sulfide3、TVOC 43.3mg/ m3。
After being treated by a chemical washing method in a first purification procedure in the system, the concentration of the components in the waste gas is as follows: ammonia gas 4.60 mg/m324.7 mg/m of hydrogen sulfide3、TVOC 18.2mg/ m3,The removal rates were 96.5%, 29.5%, and 58.0%, respectively.
After the treatment of the second purification procedure in the system by the bio-trickling filtration method, the concentration of the components in the waste gas is as follows: ammonia gas 2.12 mg/m3Hydrogen sulfide 4.37 mg/m3、TVOC 7.26mg/ m3,The removal rates were 98.4%, 87.5%, and 83.2%, respectively.
The concentration of the components of the waste gas is measured by a microporous photocatalytic oxidation method in a third purification process in the system: ammonia gas 0.6 mg/m31.84 mg/m of hydrogen sulfide3、TVOC 4.2mg/ m3,The removal rate is respectively99.5%、95.7%、90.3%。
The concentration of the components of the waste gas is determined by the fourth purification procedure in the system by using an activated carbon adsorption method: ammonia gas 0.3 mg/m31.42 mg/m of hydrogen sulfide3、TVOC 3.74mg/ m3,The removal rates were 99.8%, 95.9%, and 91.4%, respectively.
The dried organic waste gas passes through the combined type waste gas deep treatment system, and the concentrations of ammonia gas, hydrogen sulfide and TVOC are purified to a great extent.
Claims (5)
1. The advanced treatment method of the high-sulfur ammonia organic waste gas is characterized by comprising the following steps:
(1) collecting waste gas;
(2) the waste gas is chemically washed by a washing tower;
(3) removing impurities from the waste gas through a biological trickling filter;
(4) the waste gas enters the microporous ultraviolet light catalysis equipment to degrade organic components, microorganisms and bacteria in the waste gas;
(5) the exhaust gas passes through activated carbon to adsorb residual components.
2. The method for the advanced treatment of organic waste gas with high content of sulfur and ammonia according to claim 1, wherein in step (1), the waste gas is collected by space ventilation, and the waste gas is sent to the subsequent treatment process by space negative pressure.
3. The advanced treatment method for organic waste gas with high ammonia sulfur content as claimed in claim 1, wherein in step (2), the scrubber comprises an alkaline scrubber whose absorption liquid is sodium hydroxide solution and an acid scrubber whose absorption liquid is sulfuric acid solution, wherein the pH of the sodium hydroxide solution is not less than 9.5 and the pH of the sulfuric acid solution is not more than 3, and the waste gas passes through the alkaline scrubber and then the acid scrubber to remove the thioether waste gas, acid gas and amine waste gas.
4. The method according to claim 1, wherein in the step (3), the filler in the bio-trickling filter comprises pine bark, volcanic rock, polyhedral hollow spheres and suspended filler, and the waste gas is adsorbed and absorbed by the circulating liquid and microorganisms attached to the surface of the filler when passing through the bio-trickling filter, so as to remove impurities in the waste gas.
5. The method as claimed in claim 1, wherein in step (4), the microporous UV-photocatalytic device is used for photocatalytic oxidation with UV lamp.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653184A (en) * | 2022-04-01 | 2022-06-24 | 北京建筑大学 | System and method for removing malodorous gas and bioaerosol |
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2021
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| JP2005305299A (en) * | 2004-04-21 | 2005-11-04 | Hitachi Plant Eng & Constr Co Ltd | Waste water treatment apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114653184A (en) * | 2022-04-01 | 2022-06-24 | 北京建筑大学 | System and method for removing malodorous gas and bioaerosol |
| CN114653184B (en) * | 2022-04-01 | 2023-10-27 | 北京建筑大学 | System and method for removing malodorous gas and biological aerosol |
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