Waste gas treatment device for sewage treatment station

Abstract

The utility model relates to a waste gas treatment device for a sewage treatment station, which comprises a gas inlet pipeline, a first centrifugal fan, a spray absorption tower, a high-efficiency adsorption tower, a second centrifugal fan and an exhaust funnel which are sequentially connected along a waste gas conveying direction, and the gas inlet end of the gas inlet pipeline is arranged opposite to an anaerobic tank, an aerobic tank and a sludge tank of the sewage treatment station; water distributors and absorbent packing layers are arranged in the spraying absorption tower in groups, the water distributors spray water in the direction approximately opposite to the air flow direction in the spraying absorption tower, and the absorbent packing layers are arranged on a spraying path formed by the water distributors. The efficient adsorption tower is internally provided with at least two adsorbent filler layers and UV lamp groups arranged between the two adjacent adsorbent filler layers. Through integration and optimization of the spraying absorption tower, the efficient adsorption tower and the like, a synergistic effect of various treatment technologies is realized, the overall treatment effect is improved, and the device has the advantages of improving the waste gas treatment efficiency and reducing the content of hydrogen sulfide, ammonia gas and odor.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a waste gas treatment device for a sewage treatment station. Background Art

[0002] At present, a large amount of production wastewater is generated during the slaughtering and processing of live pigs and poultry. After biochemical treatment and sludge recovery in the sewage treatment plant, these production wastewaters will produce a large amount of waste gas. These waste gases mainly contain harmful gases such as hydrogen sulfide, ammonia, and odor, which pose a potential threat to the environment and human health. Therefore, for the slaughtering and processing industry, waste gas treatment cannot be ignored. In order to effectively treat these waste gases, slaughtering and processing companies can take a variety of measures, such as reducing the amount of waste gas generated by optimizing production processes, harmless treatment of waste gas, and resource utilization of waste gas. Common waste gas treatment methods include absorption, adsorption, catalytic oxidation, etc., which can effectively reduce harmful substances in waste gas to a certain extent, but they each have some defects that cannot be ignored.

[0003] While absorption methods can convert harmful gases into harmless or less toxic substances through chemical reactions, their effectiveness is often limited by the compatibility of the absorbent with the exhaust gas composition. If the exhaust gas contains a variety of complex components, a single absorbent may not be able to fully address them, resulting in poor treatment results. Furthermore, absorbent regeneration and disposal are complex and costly tasks, adding to the complexity and financial burden of the overall treatment process.

[0004] Adsorption methods rely on the powerful adsorption capacity of adsorbents, but adsorbents have limited capacity and their efficiency decreases over time. Therefore, regular adsorbent replacement is necessary, which not only increases operating costs but can also cause secondary pollution due to improper disposal of discarded adsorbents. Furthermore, adsorption methods are sensitive to environmental factors such as temperature and humidity, which can affect treatment effectiveness.

[0005] Catalytic oxidation is a highly effective waste gas treatment technology, offering advantages such as fast reaction speed and excellent treatment results. However, the selection and preparation of catalysts is complex and costly. Furthermore, the activity of the catalyst is easily reduced by impurities in the exhaust gas, requiring regular maintenance or replacement. Furthermore, the catalytic oxidation process may produce byproducts, such as nitrogen oxides, which, if not properly handled, can have adverse environmental impacts.

[0006] To address these shortcomings, future waste gas treatment technology research and development should focus on developing more efficient, economical, and environmentally friendly treatment methods. For example, research and application of new absorbents, adsorbents, and catalysts can be explored to improve treatment efficiency and stability. Furthermore, efforts should be made to strengthen the integration and optimization of waste gas treatment equipment, achieving synergistic effects across multiple treatment technologies and enhancing overall treatment effectiveness. Furthermore, emphasis should be placed on resource recycling and energy conservation during waste gas treatment to promote the sustainable development of the waste gas treatment industry. Utility Model Content

[0007] The problem to be solved by the utility model is to provide a waste gas treatment device for a sewage treatment station in view of the above-mentioned deficiencies in the prior art, which has the advantages of improving waste gas treatment efficiency and reducing the content of hydrogen sulfide, ammonia and odor.

[0008] The above-mentioned utility model object of the present invention is achieved through the following technical solutions:

[0009] A waste gas treatment device for a sewage treatment station comprises an air intake pipe, a first centrifugal fan, a spray absorption tower, a high-efficiency adsorption tower, a second centrifugal fan, and an exhaust pipe connected in sequence along the direction of waste gas transportation, the air intake end of the air intake pipe being arranged relative to the anaerobic tank, the aerobic tank, and the sludge tank of the sewage treatment station, the spray absorption tower being provided with a water distributor and an absorbent packing layer in groups, the water distributor spraying water in a direction substantially opposite to the direction of air flow in the spray absorption tower, the absorbent packing layer being arranged on a spray path formed by the water distributor, the high-efficiency adsorption tower being provided with at least two absorbent packing layers and a UV lamp group arranged between two adjacent absorbent packing layers.

[0010] By adopting the above technical solution, the exhaust gas from the anaerobic tank, aerobic tank and sludge tank of the sewage treatment station is collected by sealing the top of the tank, and the exhaust gas in the air intake pipe is discharged into the spray absorption tower by the first centrifugal fan. The spray absorption tower adopts a bottom-in and top-out countercurrent mode. The exhaust gas enters the tower body from the bottom, and when passing through the absorbent filler layer, it is fully in contact with the spray absorption liquid sprayed by the water distributor, and the harmful pollutants in the exhaust gas are fully absorbed and purified; the exhaust gas after preliminary treatment in the spray absorption tower enters the high-efficiency adsorption tower. After passing through at least one layer of adsorbent filler layer, the pollutants in the exhaust gas diffuse from the gas phase to the outer layer of the filler and are absorbed by the filler, so that the exhaust gas is purified again and Under the ultraviolet light catalysis of the UV lamp group, the residual harmful substances in the exhaust gas are further decomposed and transformed into harmless or low-toxic substances. The UV lamp group not only enhances the efficiency of the photocatalytic reaction, but also promotes the desorption and regeneration of adsorbed substances on the adsorbent surface, thereby extending the service life of the adsorbent. Subsequently, the exhaust gas deeply purified by the high-efficiency adsorption tower is sent into the exhaust pipe through the second centrifugal fan and finally safely discharged into the atmosphere. In this process, through the integration and optimization of the spray absorption tower and the high-efficiency adsorption tower, the synergistic effect of multiple treatment technologies is achieved, and the overall treatment effect is improved, which has the advantages of improving the exhaust gas treatment efficiency and reducing the content of hydrogen sulfide, ammonia and odor.

[0011] The utility model is further configured as follows: at least two spray absorption towers are provided and are arranged sequentially along the exhaust gas conveying direction.

[0012] By adopting the above technical solution, the efficiency and effect of waste gas treatment can be significantly improved. Each spray absorption tower can purify the waste gas to a certain extent, and the combined use of at least two spray absorption towers can achieve more thorough and efficient waste gas treatment; this is because, as the waste gas passes through multiple spray absorption towers in sequence, each spraying and contact can further remove harmful substances in the waste gas, so that the waste gas meets more stringent environmental protection standards when it is finally discharged.

[0013] The utility model is further configured as follows: a first air inlet pipe and a first air outlet pipe are provided on the spray absorption tower, and the first air inlet pipe, the absorbent filler layer, the water distributor and the first air outlet pipe are arranged sequentially from bottom to top.

[0014] By adopting the above technical solution, the spray absorption tower adopts a bottom-in and top-out countercurrent mode, which is beneficial to improving the waste gas treatment efficiency and treatment effect.

[0015] The utility model is further configured as follows: the water distributors and the absorbent filler layers are arranged in at least two groups and are spaced apart from each other along the direction of the air flow.

[0016] By adopting the above technical solution, the provision of at least two groups of water distributors and absorbent filler layers not only increases the contact area between water and pollutants, but also effectively prolongs the residence time of pollutants in the device through multi-level filtration and absorption, thereby improving the purification effect; in addition, the design of interval arrangement along the air flow direction ensures that the air can fully contact with the absorbent during the flow process, avoiding the problem of uneven local treatment, making the entire air purification process more efficient and uniform.

[0017] The utility model is further configured as follows: the water distributor is provided with a plurality of spray ends, which are arranged at equal intervals along the circumference of the absorbent filler layer.

[0018] By adopting the above technical solution, not only the uniformity of spraying is ensured, but also the contact efficiency between the absorbent and the exhaust gas is significantly improved; multiple spray ends are arranged at equal intervals along the circumference of the absorbent filler layer, so that the spray water can cover the filler layer in an all-round and uniform manner, avoiding local over-wetting or drying, thereby ensuring the stability and efficiency of the entire absorption process.

[0019] The utility model is further configured as follows: the absorbent filler layer is composed of ball ring fillers.

[0020] By adopting the above technical solution, the ball ring packing has played a significant role in the absorbent packing layer with its unique structural characteristics. Its spiral surface not only increases the gas-liquid contact area, but also promotes the distribution and redistribution of the liquid, effectively improving the mass transfer efficiency. In addition, the ball ring packing has a large flux and low resistance, which enables the gas to maintain a high flow rate when passing through the absorbent packing layer, thereby accelerating the absorption process.

[0021] The utility model is further configured as follows: a demister is provided in the spray absorption tower, and the demister is provided above the water distributor.

[0022] By adopting the above technical solution, the spray absorption tower can more effectively remove droplets in the exhaust gas during the exhaust gas treatment process. The demister, as a key component, is located above the water distributor and can intercept and collect water droplets sprayed from the water distributor and tiny droplets carried in the exhaust gas. This design not only helps to improve the efficiency of exhaust gas treatment, but also effectively prevents droplets from being discharged along with the exhaust gas, thereby reducing secondary pollution to the environment.

[0023] The utility model is further configured as follows: a circulating liquid tank is provided at the bottom of the spray absorption tower, and the water outlet of the circulating liquid tank and the water inlet of the water distributor are connected via a circulating pump.

[0024] By adopting the above technical solution, the circulating liquid tank is used to collect the spray absorption liquid and enable it to be effectively recycled, thereby improving the processing efficiency of the spray absorption tower. The operation of the circulating pump enables the spray absorption liquid to be extracted from the circulating liquid tank and evenly sprayed in the tower through the water distributor, fully contacting with the exhaust gas, and realizing an efficient absorption and purification process.

[0025] The utility model is further configured as follows: a second air inlet pipe and a second air outlet pipe are provided on the high-efficiency adsorption tower, and the second air inlet pipe, the adsorbent filler layer, the UV lamp group and the second air outlet pipe are approximately on the same horizontal axis.

[0026] The adoption of the above technical solution is beneficial to improving the waste gas treatment efficiency and treatment effect.

[0027] The utility model is further configured as follows: the adsorbent filler layer is composed of activated carbon filler.

[0028] By adopting the above technical solution, activated carbon filler, as the core component of the adsorbent filler layer, offers significant advantages in the water treatment process due to its unique physical structure and chemical properties. Activated carbon possesses a well-developed pore structure, with numerous pores and a wide range of pore sizes, from micropores to macropores, providing abundant surface area and channels for the adsorption process. This structure enables the activated carbon to efficiently capture and immobilize impurity molecules in water, such as organic pollutants, residual chlorine, and heavy metal ions, significantly purifying waste gas.

[0029] In summary, the beneficial technical effects of the present invention are: through the integration and optimization of spray absorption towers and high-efficiency adsorption towers, the synergistic effect of multiple treatment technologies is achieved, the overall treatment effect is improved, and it has the advantages of improving waste gas treatment efficiency and reducing the content of hydrogen sulfide, ammonia and odor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the waste gas treatment device of the sewage treatment station of the present utility model.

[0031] Figure 2 It is a structural schematic diagram of the spray absorption tower of the utility model.

[0032] Figure 3 It is a structural schematic diagram of the high-efficiency adsorption tower of the utility model.

[0033] In the figure, 1. Air inlet pipe; 2. First centrifugal fan; 3. Spray absorption tower; 31. Circulating liquid tank; 32. First air inlet pipe; 33. Absorbent packing layer; 34. Water distributor; 35. Demister; 36. First air outlet pipe; 37. Circulating pump; 4. High-efficiency adsorption tower; 41. Second air inlet pipe; 42. Absorbent packing layer; 43. UV lamp group; 44. Second air outlet pipe; 5. Second centrifugal fan; 6. Exhaust pipe. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further explained below with reference to the accompanying drawings and specific implementation methods.

[0035] Reference Figure 1 The utility model discloses a waste gas treatment device for a sewage treatment station, comprising an intake pipe 1, a first centrifugal fan 2, two spray absorption towers 3, a high-efficiency adsorption tower 4, a second centrifugal fan 5, and an exhaust pipe 6, which are sequentially connected along the direction of waste gas transportation. The intake end of the intake pipe 1 is arranged relative to the anaerobic tank, aerobic tank, and sludge tank of the sewage treatment station. The spray absorption tower 3 uses spray water to absorb harmful pollutants to achieve preliminary purification of the waste gas. The high-efficiency adsorption tower 4 uses a combination of photocatalysis and activated carbon adsorption to achieve deep purification of the waste gas, capable of reducing the contents of hydrogen sulfide, ammonia, and odor to below 0.06, 1.5, and 20 mg / m³, respectively.

[0036] Reference Figure 2 The spray absorption tower 3 is provided with a circulating liquid tank 31, a first air inlet pipe 32, an absorbent packing layer 33, a water distributor 34, an absorbent packing layer 33, a water distributor 34, a demister 35 and a first air outlet pipe 36 arranged in sequence from bottom to top. The first air inlet pipe 32 and the first air outlet pipe 36 form a reverse air flow in the spray absorption tower 3, and the water distributor 34 and the absorbent packing layer 33 are grouped into two groups and arranged at intervals along the direction of the air flow. The water distributor 34 sprays water in a direction substantially opposite to the direction of the air flow in the spray absorption tower 3. The spray end of the water distributor 34 is provided with multiple spray ends and arranged at equal intervals along the circumference of the absorbent packing layer 33. The absorbent packing layer 33 is composed of ball ring packing and is arranged on the spray path formed by the water distributors 34 in the same group. The water outlet of the circulating liquid tank 31 and the water inlet of the water distributor 34 are connected by a circulating pump 37.

[0037] During the spray absorption process, the two sets of water distributors 34 and absorbent packing layer 33 not only increase the contact area between water and pollutants, but also effectively prolong the residence time of pollutants within the device through dual-level filtration and absorption, thereby improving the purification effect. Furthermore, the design of spacing the water distributors along the air flow direction ensures that the air is fully exposed to the absorbent during flow, avoiding the problem of uneven localized treatment and making the entire air purification process more efficient and uniform.

[0038] At the same time, the ball ring packing, with its unique structural characteristics, plays a significant role in the absorbent packing layer 33. Its spiral surface not only increases the gas-liquid contact area, but also promotes the distribution and redistribution of the liquid, effectively improving the mass transfer efficiency. In addition, the ball ring packing has a large flux and low resistance, which enables the gas to maintain a high flow rate when passing through the absorbent packing layer 33, thereby accelerating the absorption process.

[0039] In addition, the spray absorption tower 3 can more effectively remove droplets in the exhaust gas during the treatment process. The demister 35 is a key component, which is located above the water distributor 34. It can intercept and collect water droplets sprayed from the water distributor 34 and tiny droplets carried in the exhaust gas. This design not only helps to improve the efficiency of exhaust gas treatment, but also effectively prevents droplets from being discharged along with the exhaust gas, thereby reducing secondary pollution to the environment.

[0040] The circulating liquid tank 31 is used to collect the spray absorption liquid and enable it to be effectively recycled, thereby improving the processing efficiency of the spray absorption tower 3. The operation of the circulating pump 37 allows the spray absorption liquid to be extracted from the circulating liquid tank 31 and evenly sprayed in the tower through the water distributor 34, fully contacting with the exhaust gas to achieve an efficient absorption and purification process.

[0041] Reference Figure 3 , a second air inlet pipe 41, an adsorbent filler layer 42, a UV lamp group 43, an adsorbent filler layer 42 and a second air outlet pipe 44 are sequentially arranged along the horizontal axis in the high-efficiency adsorption tower 4. Among them, the adsorbent filler layer 42 is composed of activated carbon filler. As the core component of the adsorbent filler layer 42, the activated carbon filler has a unique physical structure and chemical properties that bring significant advantages to the water treatment process. Activated carbon has a developed pore structure. These pores are not only numerous, but also have a wide range of pore size distribution, from micropores to macropores, providing abundant surface area and channels for the adsorption process. This structure enables the activated carbon to efficiently capture and fix impurity molecules in water, such as organic pollutants, residual chlorine, heavy metal ions, etc., thereby significantly purifying the exhaust gas.

[0042] The implementation principle of this embodiment is as follows: after the exhaust gas from the anaerobic tank, aerobic tank and sludge tank of the sewage treatment station is collected and sealed with a cover on the top of the tank, the exhaust gas in the air inlet pipe 1 is discharged into the spray absorption tower 3 by the first centrifugal fan 2. The spray absorption tower 3 adopts a bottom-in and top-out countercurrent mode. The exhaust gas enters the tower body from the bottom. When passing through the absorbent filler layer 33, it is fully in contact with the spray absorption liquid sprayed by the water distributor 34, and the harmful pollutants in the exhaust gas are fully absorbed and purified; the exhaust gas after preliminary treatment in the spray absorption tower 3 enters the high-efficiency adsorption tower 4. After passing through at least one layer of adsorbent filler layer 42, the pollutants in the exhaust gas diffuse from the gas phase to the outer layer of the filler and are absorbed by the filler, so that the exhaust gas is purified again, and Under the ultraviolet light catalysis of the UV lamp group 43, the residual harmful substances in the exhaust gas are further decomposed and converted into harmless or low-toxic substances. The UV lamp group 43 not only enhances the efficiency of the photocatalytic reaction, but also promotes the desorption and regeneration of the adsorbed substances on the surface of the adsorbent, thereby extending the service life of the adsorbent. Subsequently, the exhaust gas deeply purified by the high-efficiency adsorption tower 4 is sent into the exhaust pipe 6 through the second centrifugal fan 5, and is finally safely discharged into the atmosphere. In this process, through the integration and optimization of the spray absorption tower 3 and the high-efficiency adsorption tower 4, the synergistic effect of multiple treatment technologies is achieved, the overall treatment effect is improved, and the advantages of improving the exhaust gas treatment efficiency and reducing the content of hydrogen sulfide, ammonia and odor are achieved.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A waste gas treatment device for a sewage treatment station, characterized by: The invention comprises an air intake pipe (1), a first centrifugal fan (2), a spray absorption tower (3), a high-efficiency adsorption tower (4), a second centrifugal fan (5), and an exhaust pipe (6) connected in sequence along the direction of waste gas transportation. The air intake end of the air intake pipe (1) is arranged relative to the anaerobic tank, the aerobic tank and the sludge tank of the sewage treatment station. The spray absorption tower (3) is provided with a water distributor (34) and an absorbent packing layer (33) in groups. The water distributor (34) sprays water in a direction substantially opposite to the direction of the air flow in the spray absorption tower (3). The absorbent packing layer (33) is arranged on a spray path formed by the water distributor (34). The high-efficiency adsorption tower (4) is provided with at least two absorbent packing layers (42) and a UV lamp group (43) arranged between two adjacent absorbent packing layers (42).

2. The waste gas treatment device for a sewage treatment station according to claim 1, characterized in that: At least two spray absorption towers (3) are provided and are arranged sequentially along the exhaust gas conveying direction.

3. The waste gas treatment device for a sewage treatment station according to claim 2, characterized in that: The spray absorption tower (3) is provided with a first air inlet pipe (32) and a first air outlet pipe (36), wherein the first air inlet pipe (32), the absorbent filler layer (33), the water distributor (34) and the first air outlet pipe (36) are arranged sequentially from bottom to top.

4. The waste gas treatment device for a sewage treatment station according to claim 3, characterized in that: The water distributors (34) and absorbent filler layers (33) are arranged in at least two groups and spaced apart from each other along the air flow direction.

5. The waste gas treatment device for a sewage treatment station according to claim 4, characterized in that: The water distributor (34) is provided with a plurality of spray ends, which are arranged at equal intervals along the circumference of the absorbent filler layer (33).

6. The waste gas treatment device for a sewage treatment station according to claim 4, characterized in that: The absorbent filler layer (33) is composed of ball ring fillers.

7. The waste gas treatment device for a sewage treatment station according to claim 3, characterized in that: A demister (35) is provided in the spray absorption tower (3), and the demister (35) is arranged above the water distributor (34).

8. The waste gas treatment device for a sewage treatment station according to claim 3, characterized in that: A circulating liquid tank (31) is provided at the bottom of the spray absorption tower (3), and a water outlet of the circulating liquid tank (31) and a water inlet of the water distributor (34) are connected via a circulating pump (37).

9. The waste gas treatment device for a sewage treatment station according to claim 1, characterized in that: The high-efficiency adsorption tower (4) is provided with a second air inlet pipe (41) and a second air outlet pipe (44); the second air inlet pipe (41), the adsorbent filler layer (42), the UV lamp group (43) and the second air outlet pipe (44) are approximately located on the same horizontal axis.

10. The waste gas treatment device for a sewage treatment station according to claim 9, characterized in that: The adsorbent filler layer (42) is composed of activated carbon filler.

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