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CN-122006426-A - Water-gas integrated treatment system and method for enhanced absorption coupling biological treatment

CN122006426ACN 122006426 ACN122006426 ACN 122006426ACN-122006426-A

Abstract

The invention belongs to the technical field of air pollution control, and particularly relates to a water-air integrated treatment system and method for enhanced absorption coupling biological treatment. The system comprises a primary enhanced absorption unit, a secondary absorption+biological coupling unit and a control unit. The malodorous waste gas to be treated sequentially enters a first-stage strengthening absorption unit and a second-stage absorption and biological coupling unit, is primarily purified in the first-stage strengthening absorption unit under the action of a composite absorbent, and is then deeply purified in the second-stage absorption and biological coupling unit under the coupling action of the composite absorbent and microbial agents. The system solves the problems of poor effect of a biological method on hydrophobic waste gas and easy saturation failure of an absorption method, simultaneously realizes wastewater purification, solves the problem of secondary pollution of wastewater, and realizes integrated treatment of water bodies. The method has the advantages of compact structure, environment friendliness, low cost, wide application range, good treatment effect and strong load fluctuation resistance.

Inventors

  • LU PENG
  • Ye Lvmeng
  • CEN CHAOPING
  • TANG ZHIXIONG

Assignees

  • 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所)

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The water-gas integrated treatment system for enhanced absorption coupling biological treatment is characterized by comprising a primary enhanced absorption unit, a secondary absorption and biological coupling unit and a control unit: The primary enhanced absorption unit comprises a primary circulating pump, a primary atomizing nozzle, a primary water storage tank, a primary dosing device, a primary pH meter, a temperature and humidity sensor, a primary packed bed, an air inlet and a water storage tank communication pipeline and a one-way valve, wherein the primary dosing device and the primary pH meter are connected with the primary water storage tank, the water inlet end of the primary circulating pump is connected with the primary water storage tank, the water outlet end of the primary circulating pump is connected with the primary atomizing nozzle, the primary atomizing nozzle is arranged above the primary packed bed, and the temperature and humidity sensor is arranged on the air inlet pipeline; The secondary absorption and biological coupling unit comprises a secondary circulating pump, a secondary atomizing nozzle, a secondary water storage tank, a secondary dosing device, a secondary pH meter, a secondary packed bed, a gas distribution device and a liquid redistributor and an air outlet, wherein the secondary dosing device and the secondary pH meter are connected with the secondary water storage tank, the water inlet end of the secondary circulating pump is connected with the secondary water storage tank, the water outlet end of the secondary circulating pump is connected with the secondary atomizing nozzle, and the secondary atomizing nozzle is arranged above the secondary packed bed; The bottom of the first-stage enhanced absorption unit is communicated with the bottom of the second-stage absorption and biological coupling unit; The primary water storage tank is connected with the secondary water storage tank through a water storage tank communicating pipeline; The control unit comprises an air inlet detector, an air outlet detector and a control system.
  2. 2. The integrated water and gas treatment system for enhanced absorption coupled biological treatment according to claim 1, wherein the filler used in the primary filler bed is an absorption filler, and is specifically one or more of ceramic, stainless steel or plastic fillers.
  3. 3. The water-gas integrated treatment system for strengthening absorption coupling biological treatment according to claim 1 is characterized in that the filler used by the secondary filler bed is a combination of absorption filler, ceramsite/volcanic rock, active carbon/zeolite and bark/coconut shell, and comprises, by mass, 10-30% of absorption filler, 20-40% of ceramsite/volcanic rock, 10-30% of active carbon/zeolite and 10-30% of bark/coconut shell, wherein the absorption filler is one or more of ceramic, stainless steel or plastic filler.
  4. 4. The water-gas integrated treatment system for enhanced absorption coupling biological treatment according to claim 1, wherein the number of the secondary packed bed is four, the top of each packing layer is provided with a liquid redistributor, and the packing of the secondary packed bed is loaded with microbial agents.
  5. 5. A water-gas integrated treatment method for enhanced absorption coupling biological treatment is characterized in that malodorous waste gas to be treated sequentially enters a primary enhanced absorption unit and a secondary absorption and biological coupling unit for purification, and the method comprises the following steps: (1) The malodorous waste gas firstly enters a first-stage enhanced absorption unit, and the sprayed composite absorbent contacts with the malodorous gas to realize primary purification of the malodorous gas, and simultaneously, a saturated absorption tail liquid is generated; (2) The malodorous gas after preliminary purification flows to the bottom of the secondary absorption and biological coupling unit and is uniformly fed into the secondary packed bed through a gas distribution device at the bottom of the secondary absorption and biological coupling unit, malodorous waste gas flows to a gas outlet from bottom to top through the secondary packed bed, and contacts with microbial agents loaded on the packing when passing through the secondary packed bed; (3) The saturated absorption tail liquid generated in the first-stage strengthening absorption unit enters a second-stage water storage tank of the second-stage absorption and biological coupling unit through a pipeline and is sprayed on a second-stage packed bed, and malodor and organic components in the saturated absorption tail liquid are purified by microbial agents on the packing; The composite absorbent in the first-stage enhanced absorption unit and the second-stage absorption and biological coupling unit consists of, by mass, 0.01-2% of a plant extractant, 0.01-2% of a surfactant, 1-10% of a cosolvent, 0.1-2% of a buffering agent and the balance of water.
  6. 6. The method for integrated treatment of water and gas by enhanced absorption coupled biological treatment according to claim 5, wherein the plant extractant is prepared by the following steps (a) or (B): (A) Modifying the active ingredient by at least one of O 2 、N 2 、NH 3 or CF 4 plasmas; (B) The active ingredients are subjected to Ar or N 2 plasma activation surface treatment, and then react in 0.5-2.5 mol/L acrylic acid methanol solution at 20-60 ℃ for 0.5-5 hours; The active ingredients in the step (A) and the step (B) are prepared by heating and dehydrating one or more of soybean oil, palm oil, corn oil, peanut oil, olive oil, rapeseed oil, safflower seed oil, sunflower seed oil, canola oil, sea buckthorn seed oil, tea oil, meinaria oil, linseed oil, argan oil and walnut oil, then adding acid, continuously stirring, adding alkali liquor, and continuously stirring to obtain the active ingredients.
  7. 7. The method for integrated treatment of water and gas by enhanced absorption coupling biological treatment according to claim 6, wherein the time of modification treatment in step (a) is 1-10 min, the discharge power is 5-500W, the time of activation surface treatment in step (B) is 1-10 min, and the discharge power is 5-500W.
  8. 8. The method for integrated treatment of water and gas by intensified absorption coupling biological treatment according to claim 5, wherein the surfactant is one or more of fatty alcohol polyoxyethylene ether, alkyl glycoside, fatty acid ethanolamide and polysorbate, the cosolvent is one or more of ethanol, isopropanol, butanol and ethylene glycol, and the buffer is one or more of citrate, phosphate and acetate.
  9. 9. The method for integrated treatment of water vapor by enhanced absorption coupled biological treatment according to claim 5, wherein the microbial agent is one or more of sulfur oxidizing bacteria, nitromonas, bacillus and pseudomonas.
  10. 10. The method for integrally treating water and gas by intensified absorption coupling biological treatment according to claim 5, wherein the method is characterized in that the control system is used for analyzing the concentration of malodorous waste gas at the air inlet and the air outlet in real time, controlling the operation of a dosing device, a circulating pump and an atomizing nozzle, and ensuring that the waste gas reaches the emission standard.

Description

Water-gas integrated treatment system and method for enhanced absorption coupling biological treatment Technical Field The invention belongs to the technical field of air pollution control, and particularly relates to a water-air integrated treatment system and method for enhanced absorption coupling biological treatment. Background Malodorous contaminants include ammonia, hydrogen sulfide, methyl mercaptan, styrene, etc., which are derived from industrial and agricultural production, household garbage disposal, municipal public facilities, etc. Sources of malodorous contaminants include municipal system malodor sources such as sewage and garbage disposal sites and industrial malodor sources. Industrial malodor sources are various, wherein waste gases in industries such as feed, electronics, leather, metal surface treatment, plastics, paper making, textile printing and dyeing and the like have low organic matter content, but have peculiar smell, and the waste gases contain dust, inorganic and organic matters, have complex components and are very difficult to treat. The method for treating malodorous waste gas can be divided into a dry method and a wet method, wherein the dry method comprises adsorption, catalysis and the like, the efficiency is high, the investment and operation cost is high, and the waste gas containing dust is easy to cause blockage. The wet method comprises an absorption method, biological treatment and the like, the absorption method has strong wide adaptability, is particularly suitable for the treatment of malodor and complex low-concentration organic waste gas, but the traditional water spraying efficiency is low, and the problem of how to improve the absorption efficiency is solved. The biological method is more suitable for municipal malodor source treatment, but has the problems of poor load fluctuation resistance, low mass transfer efficiency of hydrophobic VOCs (such as benzene series and alkanes), slow biodegradation rate and the like. Chinese patent CN211963501U discloses a malodorous gas purifying device, which comprises an absorption and biological treatment unit, but the absorption and biological treatment of the device are independent, and there are still problems of low absorption process efficiency, difficult waste water treatment and low degradation efficiency of biological treatment on hydrophobic VOCs. Chinese patent CN223209278U discloses an integrated multi-stage anti-clogging biological deodorizing and purifying device, which firstly removes dust and humidifies, then carries out biological treatment, and is suitable for treating waste gas with good biodegradability, but is still difficult to effectively treat hydrophobic VOCs (such as benzene, toluene, methylene dichloride, etc.) in malodorous waste gas. Disclosure of Invention The invention aims to solve the problems of low absorption efficiency, secondary pollution of wastewater, poor load fluctuation resistance of a biological method and low degradation efficiency of hydrophobic VOCs in the prior art, and provides a water-gas integrated treatment system for enhanced absorption coupling biological treatment. The invention also aims to provide a water-gas integrated treatment method for enhanced absorption coupling biological treatment. The invention aims at realizing the following technical scheme: a water-gas integrated treatment system for enhanced absorption coupling biological treatment comprises a primary enhanced absorption unit, a secondary absorption and biological coupling unit and a control unit: The primary enhanced absorption unit comprises a primary circulating pump, a primary atomizing nozzle, a primary water storage tank, a primary dosing device, a primary pH meter, a temperature and humidity sensor, a primary packed bed, an air inlet and a water storage tank communication pipeline and a one-way valve, wherein the primary dosing device and the primary pH meter are connected with the primary water storage tank, the water inlet end of the primary circulating pump is connected with the primary water storage tank, the water outlet end of the primary circulating pump is connected with the primary atomizing nozzle, the primary atomizing nozzle is arranged above the primary packed bed, and the temperature and humidity sensor is arranged on the air inlet pipeline; The secondary absorption and biological coupling unit comprises a secondary circulating pump, a secondary atomizing nozzle, a secondary water storage tank, a secondary dosing device, a secondary pH meter, a secondary packed bed, a gas distribution device and a liquid redistributor and an air outlet, wherein the secondary dosing device and the secondary pH meter are connected with the secondary water storage tank, the water inlet end of the secondary circulating pump is connected with the secondary water storage tank, the water outlet end of the secondary circulating pump is connected with the secondary atomizing nozzle, and the secondary atomizin