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CN-122006449-A - Waste gas treatment system and application thereof, and treatment method for malodorous gas generated in household garbage landfill

CN122006449ACN 122006449 ACN122006449 ACN 122006449ACN-122006449-A

Abstract

The invention belongs to the technical field of environmental treatment, and particularly relates to an exhaust gas treatment system and application thereof, and a treatment method for malodorous gas generated in a household garbage landfill. The waste gas treatment system provided by the invention comprises an alkaline washing spray tower, a biological filter bed, a deodorizing spray tower and an emptying pipe, wherein a first gas inlet at the bottom of the biological filter bed is communicated with an outlet at the top of the alkaline washing spray tower, a second gas inlet at the bottom of the biological filter bed is communicated with an outlet at the top of the biological filter bed, and the emptying pipe is communicated with an outlet at the top of the deodorizing spray tower. When the waste gas treatment system provided by the invention is used for treating malodorous gas, three steps of purification treatment including primary gas-liquid mass transfer, microbial degradation and secondary gas-liquid mass transfer can be carried out on the malodorous gas, so that various harmful substances in waste gas can be removed efficiently, meanwhile, the system provided by the invention is not easy to leak, continuous treatment can be realized, and secondary pollution is reduced while the treatment effect is ensured.

Inventors

  • YANG HAI
  • Fu Zhilan
  • YANG HONGFU
  • Duan Benlei
  • DENG YULAN
  • DENG QIJUN
  • WANG PAN
  • YUAN HUAJIE

Assignees

  • 四川正升环保科技有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The waste gas treatment system is characterized by comprising an alkaline washing spray tower (1), a biological filter bed (2) with a first bottom gas inlet (21) communicated with an outlet (15) at the top of the alkaline washing spray tower, a deodorizing spray tower (3) with a second bottom gas inlet (31) communicated with an outlet (23) at the top of the biological filter bed, and an emptying pipe (4) communicated with an outlet (35) at the top of the deodorizing spray tower.
  2. 2. The waste gas treatment system according to claim 1, wherein the lower part of the alkaline washing spray tower (1) is provided with a waste gas inlet (11), the upper part of the alkaline washing spray tower (1) is provided with an alkaline liquid spray head, the upper part of the alkaline liquid spray head is provided with a first demister (12), the alkaline liquid spray head is communicated with the lower outlet of an alkaline liquid storage container (13) through a first delivery pump (14), and the bottom outlet of the alkaline washing spray tower (1) is communicated with the top inlet of the alkaline liquid storage container (13); the alkaline washing spray tower (1) is internally provided with a filler, and the side surface of the lower part of the alkaline washing spray tower (1) is provided with a liquid level meter.
  3. 3. The waste gas treatment system according to claim 1, wherein a composite filter material layer, a pH meter, a liquid level meter and a circulating device are arranged in the biological filter bed (2), the circulating device comprises a humidifying nozzle arranged at the upper part of the composite filter material layer, and the humidifying nozzle is communicated with nutrient solution at the bottom of the biological filter bed through a circulating pump (22).
  4. 4. The exhaust gas treatment system of claim 3, wherein the composite filter material in the composite filter material layer comprises an active component and a carrier, the carrier being polypropylene hollow spheres; the active components comprise the following components in percentage by mass: 35-45% of ceramsite; 25-32% of volcanic rock; 23-28% of pine bark; 4-6% of active carbon.
  5. 5. The exhaust gas treatment system according to claim 1, wherein a deodorant spray head is provided at an upper portion of the deodorant spray tower (3), and a second mist eliminator (32) is provided at an upper portion of the deodorant spray head, the deodorant spray head being in communication with a lower outlet of a deodorant storage container (33) through a second delivery pump (34), a bottom outlet of the deodorant spray tower (3) being in communication with a top inlet of the deodorant storage container (33); the deodorizing spray tower (3) is internally provided with a filler, and the side surface of the lower part of the deodorizing spray tower (3) is provided with a liquid level meter.
  6. 6. The use of the exhaust gas treatment system of any one of claims 1 to 5 for treating malodorous gases produced in a landfill.
  7. 7. A method for treating malodorous gas generated in a household garbage landfill is characterized by comprising the following steps: Delivering malodorous gas generated in a household garbage landfill to an alkaline washing spray tower (1) to be in reverse contact with alkali liquor for alkaline washing to obtain primary deodorizing gas; The primary deodorizing gas is conveyed to a biological filter bed (2) for biological deodorization to obtain secondary deodorizing gas, wherein the pressure drop range of the biological filter bed in the biological deodorization operation process is 500-1000 Pa/m; Conveying the secondary deodorizing gas into a deodorizing spray tower (3) to be in reverse contact with a deodorant solution for deodorizing, so as to obtain deodorized gas; And exhausting the deodorized gas through an exhaust pipe (4).
  8. 8. The treatment method according to claim 7, wherein the flow rate of the malodorous gas is 1200-1300 m 3 /h; The alkali liquor comprises sodium hydroxide solution, and the pH value of the alkali liquor is 11-13; The liquid-gas ratio of the alkaline washing is 5-15L/m 3 .
  9. 9. The method according to claim 7, wherein the functional group used in the biological deodorization comprises one or more of sulfide bacteria, nitrifying bacteria, denitrifying bacteria, bacillus, pseudomonas and yeast; the flow rate of the primary deodorizing gas is 1200-1300 m 3 /h; The relative humidity of the environment of the biological deodorization is 40-60%, the pH value is 6.5-8.5, and the temperature is 20-30 ℃.
  10. 10. The method of treatment of claim 7, wherein the deodorant in the deodorant solution comprises a plant deodorant; The flow rate of the secondary deodorizing gas is 1200-1300 m 3 /h, and the mass ratio of the volume of the secondary deodorizing gas to the mass ratio of the plant deodorizing agent is 98-100 m 3 :1 kg.

Description

Waste gas treatment system and application thereof, and treatment method for malodorous gas generated in household garbage landfill Technical Field The invention belongs to the technical field of environmental treatment, and particularly relates to an exhaust gas treatment system and application thereof, and a treatment method for malodorous gas generated in a household garbage landfill. Background The domestic garbage landfill site can continuously generate malodor in the life cycle, the malodor mainly comes from gases generated by decomposition of organic matters in the garbage landfill process, such as hydrogen sulfide, ammonia, methane, carbon dioxide and the like, and other possibly released harmful gases, and meanwhile, a large amount of rainwater infiltrates into a garbage pile body to generate a large amount of garbage leachate, so that the malodor problem is aggravated. These malodors can have a certain impact on the quality of life of surrounding residents, and therefore malodor control is an important aspect in the overall life cycle management of a landfill. At present, the method mainly adopts a chemical absorption or physical absorption mode to treat the malodor generated by the domestic garbage landfill, however, the treatment modes have lower treatment efficiency on malodorous gas and have the condition of external leakage of malodor, meanwhile, the malodor generated by the domestic garbage landfill has the characteristics of high concentration (H 2 S is 1000-5000 mg/m 3,NH3 is 500-2000 mg/m 3), complex components (malodorous substances including mercaptan, amine and the like), strong corrosiveness (acid gas corrosion equipment), high biotoxicity (H 2 S extremely toxic) and the like, and the problems of secondary pollution and the like are caused once gas leakage occurs in the treatment process, Disclosure of Invention In view of the above, the invention provides an exhaust gas treatment system and application thereof, and a method for treating malodorous gas generated in a household garbage landfill site. In order to solve the technical problems, the invention provides an exhaust gas treatment system, which comprises an alkaline washing spray tower 1, a biological filter bed 2, a deodorizing spray tower 3, and an emptying pipe 4, wherein the biological filter bed 2 is communicated with an outlet 15 at the top of the alkaline washing spray tower, the deodorizing spray tower 3 is communicated with an outlet 23 at the top of the biological filter bed, and the deodorizing spray tower 4 is communicated with an outlet 35 at the top of the deodorizing spray tower. Preferably, the lower part of the alkali washing spray tower 1 is provided with an exhaust gas inlet 11, the upper part of the alkali washing spray tower 1 is provided with an alkali liquor spray head, and the upper part of the alkali liquor spray head is provided with a first demister 12; the alkaline washing spray tower 1 is internally provided with a filler, and the side surface of the lower part of the alkaline washing spray tower 1 is provided with a liquid level meter. Preferably, a composite filter material layer, a pH meter, a liquid level meter and a circulating device are arranged in the biological filter bed 2, the circulating device comprises a humidifying nozzle arranged at the upper part of the composite filter material layer, and the humidifying nozzle is communicated with nutrient solution at the bottom of the biological filter bed through a circulating pump 22. Preferably, the composite filter material in the composite filter material layer comprises an active component and a carrier, wherein the carrier is a polypropylene hollow sphere; the active components comprise the following components in percentage by mass: 35-45% of ceramsite; 25-32% of volcanic rock; 23-28% of pine bark; 4-6% of active carbon. Preferably, the upper part of the deodorizing spray tower 3 is provided with a deodorizing agent spray head, and the upper part of the deodorizing agent spray head is provided with a second demister 32, and the deodorizing agent spray head is communicated with the lower outlet of the deodorizing agent storage container 33 through a second delivery pump 34; The deodorizing spray tower 3 is internally provided with a filler, and the side surface of the lower part of the deodorizing spray tower 3 is provided with a liquid level meter. The invention also provides application of the waste gas treatment system in treating malodorous gas generated in a household garbage landfill site. The invention also provides a treatment method for malodorous gas generated in the household garbage landfill, which comprises the following steps: delivering malodorous gas generated in a household garbage landfill to an alkaline cleaning spray tower 1 to be in reverse contact with alkali liquor for alkaline cleaning, so as to obtain primary deodorizing gas; The primary deodorizing gas is conveyed to a biological filter bed 2 for biological deodor