Biological filter coupling treatment system based on ozone tail gas utilization

Abstract

The utility model relates to the technical field of water vapor purification treatment, in particular to a biological filter coupling treatment system based on ozone tail gas utilization, and a method comprises the following steps: introducing ozone into an ozone catalytic oxidation pond to purify sewage, and collecting generated ozone-containing tail gas at the same time; the method comprises the following steps: introducing ozone-containing tail gas and odor to be purified into a mixing tower for mixing, enabling ozone to react with the odor, and discharging the reacted mixed tail gas from the mixing tower; the mixed tail gas enters the biological filter to be continuously purified, and clean tail gas obtained after purification enters the discharge cylinder and is guided and discharged. According to the ozone tail gas treatment device, ozone oxidation and biodegradation are combined to perform coupling purification on the odor of the sewage plant, so that the purification effect is improved, the cost of ozone tail gas treatment is saved, the utilization rate of the odor is also improved, and meanwhile, the purification treatment effect of the odor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water vapor purification treatment, in particular to a biological filter coupling treatment system based on ozone tail gas utilization. Background Art

[0002] There are many difficult-to-degrade components in the wastewater of the park, and the water quality is complex. In order to meet high emission requirements, advanced oxidation combined with biochemical processes can improve the degradation rate of organic matter. Ozone oxidation process is a widely used advanced oxidation technology. Ozone has strong oxidation performance, and its redox potential is lower than fluorine, but much higher than strong oxidants such as chlorine and potassium permanganate. Ozone can not only oxidize unsaturated organic matter in wastewater, but also convert difficult-to-biodegrade compounds into small molecules that are easily biodegradable, thereby improving the biodegradability of wastewater. Ozone has high reaction efficiency, the product is oxygen, there are no harmful residues, and no secondary pollution will be generated in chemical wastewater. Ozone oxidation process has been widely used in sewage treatment in chemical parks. However, ozone tail gas is toxic and needs to be decomposed and treated with an ozone tail gas destroyer, which causes ozone waste and increases the cost of sewage treatment.

[0003] The odor problem generated during the sewage treatment process in industrial parks has become increasingly prominent, affecting the surrounding environment and residents' lives. Traditional odor treatment methods such as physical adsorption and chemical washing have problems such as low treatment efficiency and high operating costs.

[0004] It can be seen that the traditional wastewater and odor purification treatment solutions have room for improvement and should be optimized to improve treatment efficiency and reduce overall costs. Therefore, a more reasonable technical solution should be proposed to solve the technical problems existing in the existing technology. Utility Model Content

[0005] In order to overcome at least one of the defects mentioned above, the utility model proposes a biological filter coupling treatment system based on the utilization of ozone exhaust gas, which oxidizes pollutants through ozone exhaust gas and combines biological filter technology to achieve efficient treatment of odor generated during the sewage treatment process in the park.

[0006] In order to achieve the above purpose, the processing system disclosed in the utility model can adopt the following technical solutions:

[0007] The invention discloses a biofilter coupling treatment system based on the utilization of ozone tail gas, comprising an ozone catalytic oxidation tank for generating ozone-containing tail gas, an odor collecting device for collecting sewage odor, a mixing tower for oxidizing the odor to be treated to obtain mixed tail gas, and a biofilter for biodegrading the mixed odor. The mixing tower is connected to the biofilter through a mixed tail gas pipe, and the biofilter is provided with a clean tail gas pipe and biological fillers are arranged inside.

[0008] Furthermore, the structure of the mixing tower can be constructed in a variety of forms, which are not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a plurality of baffle units are arranged in the mixing tower to form a channel for guiding the airflow, and a catalytic filler is arranged in the baffle unit. When such a scheme is adopted, the baffle unit includes an upper baffle and a lower baffle, and a filler box is arranged between the upper baffle and the lower baffle and filled with fillers. A path for the airflow to pass through is formed between the upper and lower baffles, and the filler box closes the entire path. The airflow is catalyzed and reacts while passing through the filler box. By continuously arranging a plurality of baffle units in this way, the reaction of the gas can be promoted multiple times to improve the treatment effect.

[0009] Furthermore, in the utility model, the ozone-containing gas is dispersed after entering the mixing tower and is evenly mixed with the odor to be purified. The specific method is not limited to a single method. Here, an optimization is performed and one of the feasible options is proposed: a dispersion pipe for guiding the ozone-containing exhaust gas is provided in the mixing tower, and a dispersion plate is provided above the dispersion pipe.

[0010] Furthermore, the biofilter tank biodegrades the gas, and its structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: a plurality of filter components are arranged in the biofilter tank, and the filter components include a first packing layer and a second packing layer from bottom to top, and the particle size of the filler in the first packing layer is greater than the particle size of the filler in the second packing layer; the filter components are connected to form a flow channel so that the mixed exhaust gas passes through multiple filter components in sequence. When such a scheme is adopted, a partition is arranged on the side of the filter component, and the partitions of adjacent filter components form an air flow channel. The mixed exhaust gas entering the biofilter tank becomes clean exhaust gas after being purified by multiple filter components in succession.

[0011] Furthermore, the biodegradation of the biofilter is continuously maintained, and the internal maintenance method can adopt a variety of schemes. Here, optimization is made and one of the feasible options is proposed: a water storage area is set at the bottom of the biofilter, and a spraying area is set above the filter assembly, and a demisting area is set at the outlet of the biofilter. When such a scheme is adopted, the water storage area is connected to the water level maintenance assembly and monitors and replenishes and drains water in real time. The spraying area takes water from the water storage area to spray the filter assembly, assists the biological activity in the filter assembly, and also supplements the adsorption of harmful substances in the mixed tail gas; the demisting area dries and purifies the gas to be discharged, so that the impurity components in the clean tail gas discharged from the biofilter are less.

[0012] The above content discloses a system for treating sewage odor. The utility model also discloses a specific treatment method, which is described below.

[0013] The biofilter coupling treatment method based on ozone tail gas utilization includes:

[0014] The ozone is introduced into the ozone catalytic oxidation tank to purify the sewage, and the generated ozone-containing tail gas is collected at the same time;

[0015] The ozone-containing tail gas and the odor to be purified are introduced into a mixing tower for mixing, so that the ozone molecules react with the molecules of the substances in the odor, and the mixed tail gas after the reaction is discharged from the mixing tower;

[0016] The mixed exhaust gas enters the biofilter for further purification, and the clean exhaust gas obtained after purification enters the discharge cylinder and is guided out.

[0017] The above disclosed treatment method uses ozone-containing tail gas to purify sewage odor after mixed reaction, and then uses a biological filter to degrade it, thereby degrading the organic matter in the sewage odor, improving the purification effect of sewage odor, and the final exhaust gas discharged is clean exhaust gas. In this method, after multiple catalytic reactions and biodegradation reactions, not only the sewage odor is purified, but also the ozone-containing tail gas is utilized, avoiding the use of ozone destruction to separately treat the residual ozone in the ozone tail gas, thereby reducing the overall cost.

[0018] Furthermore, the ozone-containing tail gas and the odor to be purified are fully mixed and reacted to improve the purification effect. The specific method is not limited to the only one. Here, an optimization is made and one of the feasible options is proposed: the ozone-containing tail gas enters the dispersion pipe of the mixing tower and is dispersed through the dispersion pipe, and then dispersed through the dispersion plate and mixed with the odor to be purified. The mixed gas undergoes several catalytic reactions in turn to obtain a mixed tail gas. When such a scheme is adopted, the dispersion pipe is placed below the dispersion plate. After two dispersion treatments, the ozone-containing tail gas is more evenly dispersed in the mixing tower, so that it is better mixed with the odor to be purified, which is convenient for improving the purification effect.

[0019] Furthermore, proper control of the dosage of ozone-containing tail gas can not only ensure the purification effect, but also save the amount of ozone-containing tail gas. The specific control method is not limited to the only one. Here, optimization is made and one of the feasible options is proposed: after the ozone-containing tail gas enters the mixing tower, the empty tower flow rate is 1.5m / s~2m / s, the gas flow rate passing through the dispersion plate is 8m / s~14m / s, and the mixed gas flows in the partition in the mixing tower at a speed of 4m / s~6m / s. When such a scheme is adopted, the temperature, humidity, concentration, etc. of the gas are monitored in real time through sensors, and adjustment and control are performed according to the monitoring results, so that the whole system can be adjusted in time to maintain the best state.

[0020] Furthermore, when monitoring the gas in the system, the available methods are not limited to a single method. Here, we optimize and propose one feasible option: real-time monitoring of the flow, temperature and humidity of the mixed tail gas and the clean tail gas, and real-time adjustment of the dosage and flow rate of the ozone-containing tail gas. When such a solution is adopted, monitoring can be performed through sensors. A controller is set to adjust the corresponding supply pipeline, for example, the controller controls the opening of the corresponding valve group, and then adjusts the dosage.

[0021] Furthermore, in order to improve the treatment effect in the mixing tower, the direction of the internal airflow can be controlled. The specific direction is not limited to the specific direction. Here, an optimization is made and one of the feasible options is proposed: after the ozone-containing tail gas and the gas to be purified enter the mixing tower, they are transferred along a tortuous path, and are acted upon and reacted by the titanium-based catalyst during the transfer process. When such a solution is adopted, a serpentine path can be set to guide the mixed gas to pass through, so as to maximize the path of the gas.

[0022] Compared with the prior art, some beneficial effects of the technical solution disclosed in the utility model include:

[0023] The utility model combines the effects of ozone and biodegradation to couple and purify sewage odor, thereby improving the purification effect, which not only saves the process and investment of ozone treatment, but also reduces damage to the environment, while the odor purification treatment effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The schematic diagram of the whole processing system.

[0026] Figure 2 Schematic diagram of the internal structure of the mixing tower.

[0027] Figure 3 Schematic diagram of the internal structure of the biofilter.

[0028] In the above drawings, the meanings of the various marks are as follows:

[0029] 1. Mixing tower; 101. Odor air inlet; 102. Ozone-containing tail gas air inlet; 103. Dispersion pipe; 104. Dispersion plate; 105. Lower baffle; 106. Catalyst filler; 107. Upper baffle; 108. Mixed tail gas outlet; 2. Biofilter; 201. Biofilter air inlet; 202. Tap water replenishment port; 203. Water storage area; 204. First filler layer; 205. Second filler layer; 206. Nozzle; 207. Lower water distribution pipe; 208. Upper water distribution pipe; 209. Circulating water outlet; 210. Biofilter air outlet; 211. Left baffle; 212. Right baffle; 213. Defogger. DETAILED DESCRIPTION

[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0031] In view of the fact that the prior art does not treat odor in sewage thoroughly enough, and a large amount of ozone needs to be treated separately through an ozone destroyer, resulting in a huge waste of investment and resources, the following embodiments are optimized to overcome the defects in the prior art.

[0032] Example 1

[0033] like Figure 1 to Figure 3 As shown, this embodiment provides a biofilter coupling treatment method based on ozone tail gas utilization, including:

[0034] The ozone is introduced into the ozone catalytic oxidation tank to purify the sewage, and the generated ozone-containing tail gas is collected at the same time;

[0035] The ozone-containing tail gas and the odor to be purified are introduced into the mixing tower 1 for mixing, so that the ozone molecules react with the molecules of the substances in the odor, and the mixed tail gas after the reaction is discharged from the mixing tower 1;

[0036] The mixed tail gas enters the biofilter 2 for further purification, and the clean tail gas obtained after the purification enters the discharge cylinder and is guided to be discharged.

[0037] The treatment method disclosed in this embodiment uses ozone-containing tail gas to purify the sewage odor after mixed reaction, and then uses biological filter 2 for degradation, thereby degrading the organic matter in the sewage odor, improving the purification effect of the sewage odor, and the final exhaust gas discharged is clean exhaust gas. In this method, after multiple catalytic reactions and biodegradation reactions, not only the sewage odor is purified, but also the ozone-containing tail gas is utilized, avoiding the use of ozone destruction to separately treat the residual ozone in the ozone tail gas, thereby reducing the overall cost.

[0038] The ozone-containing tail gas and the odor to be purified are fully mixed and reacted to improve the purification effect. The specific method is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the ozone-containing tail gas enters the dispersion pipe 103 of the mixing tower 1 and is dispersed through the dispersion pipe 103, and then dispersed through the dispersion plate 104 and mixed with the odor to be purified. The mixed gas undergoes several catalytic reactions in turn to obtain a mixed tail gas. When such a scheme is adopted, the dispersion pipe 103 is placed below the dispersion plate 104. After two dispersion treatments, the ozone-containing tail gas is dispersed more evenly in the mixing tower 1, so that it is better mixed with the odor to be purified, which is convenient for improving the purification effect.

[0039] Properly controlling the dosage of ozone-containing tail gas can not only ensure the purification effect, but also save the amount of ozone-containing tail gas. The specific control method is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: after the ozone-containing tail gas enters the mixing tower 1, the gas flow rate passing through the dispersion plate 104 is 5m / s~7m / s, the flow rate of the mixed gas in the mixing tower 1 is 4m / s~6m / s, and the speed of the mixed tail gas discharged from the mixing tower 1 is 1.5m / s~2m / s. When such a scheme is adopted, the temperature, humidity, concentration, etc. of the gas are monitored in real time through sensors, and adjustment and control are performed according to the monitoring results, so that the whole system can be adjusted in time to maintain the best state.

[0040] When monitoring the gas in the system, the available methods are not limited to a single method. This embodiment optimizes and adopts one of the feasible options: real-time monitoring of the flow rate, temperature and humidity of the mixed tail gas and the clean tail gas, and real-time adjustment of the dosage and flow rate of the ozone-containing tail gas. When such a solution is adopted, monitoring can be performed through sensors. A controller is set to adjust the corresponding supply pipeline, for example, the controller controls the opening of the corresponding valve group, and then adjusts the dosage.

[0041] In order to improve the treatment effect in the mixing tower 1, the direction of the internal airflow can be controlled, which is not limited to the specific one. This embodiment optimizes and adopts one of the feasible options: after the ozone-containing tail gas and the gas to be purified enter the mixing tower 1, they are transferred along a tortuous path, and are acted on and reacted by the titanium-based catalyst during the transfer process. When such a solution is adopted, a serpentine path can be set to guide the mixed gas to pass through, so as to maximize the path of the gas.

[0042] Example 2

[0043] The above-mentioned embodiment 1 discloses a method for treating sewage odor, and this embodiment discloses a specific treatment system, which is described below.

[0044] The biofilter 2 coupling treatment system based on ozone tail gas utilization includes an ozone catalytic oxidation tank for generating ozone-containing tail gas, an odor collecting device for collecting sewage odor, a mixing tower 1 for oxidizing the odor to be treated to obtain mixed tail gas, and a biofilter 2 for biodegrading the mixed tail gas. The mixing tower 1 is connected to the biofilter 2 through a mixed tail gas pipe, and the biofilter 2 is provided with a clean tail gas pipe.

[0045] The structure of the mixing tower 1 can be constructed in a variety of forms, which are not limited to a single one. This embodiment is optimized and adopts one of the feasible options: a plurality of baffle units are arranged in the mixing tower 1 to form a channel for guiding the airflow, and a catalytic filler is arranged in the baffle unit. When such a scheme is adopted, the baffle unit includes an upper baffle 107 and a lower baffle 105. A filler box is arranged between the upper baffle 107 and the lower baffle 105 and is filled with fillers. A path for the airflow to pass through is formed between the upper and lower baffles 105. The filler box closes the entire path, and the airflow is catalyzed to react while passing through the filler box. By continuously arranging a plurality of baffle units in this way, the reaction of the gas can be promoted multiple times to improve the treatment effect.

[0046] In this embodiment, the ozone-containing gas is dispersed after entering the mixing tower 1 and is evenly mixed with the odor to be purified. The specific method is not limited to the specific method. This embodiment is optimized and adopts one of the feasible options: a dispersion pipe 103 for guiding the ozone-containing exhaust gas is provided in the mixing tower 1, and a dispersion plate 104 is provided above the dispersion pipe 103.

[0047] Preferably, the mixing tower 1 is provided with an odor air inlet 101 and an ozone-containing tail gas air inlet 102 . The gas entering the mixing tower 1 is purified by a plurality of baffle units, and then discharged from the mixed tail gas outlet 108 of the mixing tower 1 and enters the biofilter 2 .

[0048] The biofilter 2 biodegrades the gas, and its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: a plurality of filter components are arranged in the biofilter 2, and the filter components include a first packing layer 204 and a second packing layer 205 from bottom to top, and the particle size of the filler in the first packing layer 204 is greater than the particle size of the filler in the second packing layer 205; the filter components are connected to form a flow channel so that the mixed exhaust gas passes through multiple filter components in sequence. When such a scheme is adopted, a partition is arranged on the side of the filter component, and the partitions of adjacent filter components form an air flow channel. The mixed exhaust gas entering the biofilter 2 becomes clean exhaust gas after being purified by multiple filter components in succession.

[0049] Preferably, in this embodiment, the thickness of the first filler layer 204 is 0.2 to 1 of the thickness of the second filler layer 205. The first filler layer 204 may be a spherical plastic filler, and the second filler layer 205 may be an activated carbon filler.

[0050] The biodegradation of the biofilter 2 is continuously maintained, and the internal maintenance method can adopt a variety of schemes. This embodiment is optimized and adopts one of the feasible options: the bottom of the biofilter 2 is provided with a water storage area 203, and a spraying area is provided above the filter assembly, and a demisting area is provided at the outlet of the biofilter 2. When such a scheme is adopted, the water storage area 203 is connected to the water level maintenance assembly and monitors and replenishes and drains water in real time. The spraying area takes water from the water storage area 203 to spray the filter assembly, assists the biological activity in the filter assembly, and also supplements the adsorption of harmful substances in the mixed tail gas; the demisting area dries and purifies the gas to be discharged, so that the impurity components in the clean tail gas discharged from the biofilter 2 are reduced.

[0051] Preferably, a tap water replenishment port 202 is provided in the water storage area 203, and tap water is transported to the lower water distribution pipe 207 and the upper water distribution pipe 208, and the circulated tap water can be discharged from the circulating water outlet. The upper water distribution pipe 208 and the lower water distribution pipe are connected to a plurality of nozzles 206 and are used to spray tap water to the first filler layer and the second filler layer 205. The adjacent filter components are separated by the left partition 211 and the right partition 212 to form an air flow channel, so that the air flow can be continuously purified by passing through the adjacent filter components in sequence. The upper water distribution pipe 208 and / or the lower water distribution pipe 207 are both provided with a circulating water outlet; the purified gas is discharged from the biological filter 2 as clean tail gas, and the clean tail gas is treated by the demister 213 before being discharged from the outlet of the biological filter 2.

[0052] According to the above disclosed scheme, an example is listed here for illustration:

[0053] This embodiment provides a method for constructing a comprehensive treatment system for industrial wastewater odor in a park, which combines ozone tail gas circulation catalytic oxidation with a biofilter 2. After the industrial wastewater in the park is biochemically treated, the chemical oxygen demand (COD) of the wastewater is 55 mg / L. When the ozone dosage is 40 mg / L, after advanced oxidation treatment, the effluent COD is 40 mg / L. The ratio of ozone dosage to COD removal is 2:1, and the tail gas of the ozone catalytic oxidation tank contains a certain amount of ozone.

[0054] First, an ozone oxidation pool is built and equipped with an exhaust gas collection device to transport the collected ozone exhaust gas to a catalytic oxidation unit. The catalytic oxidation unit is filled with a titanium-based catalyst, and the ozone exhaust gas generates active substances such as hydroxyl radicals under the action of the catalyst. Next, the gas treated with catalytic oxidation is introduced into the biofilter 2, where organic matter and odorous substances are further degraded by specific microbial flora. Finally, the treated gas that meets the standards is discharged through an emission pipeline.

[0055] On the basis of the above content, the system control and monitoring unit is further optimized. By setting up gas flow sensors, temperature sensors and humidity sensors, the system operation status is monitored in real time, and the ozone dosage, gas flow rate and other parameters are automatically adjusted according to the monitoring data to ensure efficient and stable operation of the system.

[0056]

[0057]

[0058] The total deodorization efficiency of the biofilter should be greater than 90%, of which the H2S removal rate is ≥99.5%, the NH3 removal rate is ≥98%, the mercaptan removal rate is ≥99%, and the odor removal rate is ≥97%. The tail gas after treatment meets the secondary standard of the maximum allowable concentration of waste gas emissions at the plant boundary (edge ​​of the protection zone) in the "Emission Standard of Pollutants for Urban Wastewater Treatment Plants" (GB18918-2002). The tail gas after odor treatment can meet the 15m chimney emission standard in the "Emission Standard of Malodor Pollutants" (GB14554-93).

[0059] On the basis of the above, the biofilter unit was improved. A filler with high specific surface area and good air permeability was selected, and a microbial membrane with high efficiency in degrading specific malodorous substances was cultivated on the surface of the filler, thereby improving the treatment efficiency and stability of the biofilter unit.

[0060] When operating according to the previous example, ozone tail gas is used as an advanced oxidant and the ozone tail gas destroyer is eliminated, which not only reduces investment and operating costs, but also realizes the recycling of resources.

[0061] Combined with biological filter technology, the odor treatment efficiency is improved and the risk of secondary pollution is reduced.

[0062] Compared with the single biological deodorization technology, the effective residence time of odor is reduced by 10s and the volume of the biological filter is reduced by 40%.

[0063] The control system realizes automatic control of the system and improves operating efficiency and stability.

[0064] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A biofilter coupling treatment system based on ozone tail gas utilization, characterized by: The invention comprises an ozone catalytic oxidation tank for generating ozone-containing tail gas, an odor collecting device for collecting sewage odor, a mixing tower (1) for oxidizing the odor to be treated to obtain mixed tail gas, and a biofilter (2) for biodegrading the mixed tail gas. The mixing tower (1) is connected to the biofilter (2) through a mixed tail gas pipe, and the biofilter (2) is provided with a clean tail gas pipe.

2. The biofilter coupling treatment system based on ozone tail gas utilization according to claim 1 is characterized in that: The mixing tower (1) is provided with a plurality of baffle units to form a channel for guiding the air flow, and a catalytic filler is provided in the baffle units.

3. The biofilter coupling treatment system based on ozone tail gas utilization according to claim 1 or 2, characterized in that: The mixing tower (1) is provided with a dispersion pipe (103) for guiding the ozone-containing tail gas, and a dispersion plate (104) is provided above the dispersion pipe (103).

4. The biofilter coupling treatment system based on ozone tail gas utilization according to claim 1 is characterized in that: The biological filter (2) is provided with a plurality of filter components, the filter components comprising a first filler layer (204) and a second filler layer (205) from bottom to top, the filler particle size in the first filler layer (204) being greater than the filler particle size in the second filler layer (205); the filter components are connected to form a flow channel so that the mixed exhaust gas passes through the plurality of filter components in sequence.

5. The biofilter coupling treatment system based on ozone tail gas utilization according to claim 4 is characterized in that: A water storage area (203) is arranged at the bottom of the biological filter (2), a spraying area is arranged above the filtering component, and a demisting area is arranged at the outlet of the biological filter (2).

6. The biofilter coupling treatment system based on ozone tail gas utilization according to claim 1 is characterized in that: The clean tail gas pipe is provided with biological filler.

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