Device for treating odor through electrocatalytic oxidation

Abstract

The utility model discloses a device for treating odor through electrocatalytic oxidation, and belongs to the technical field of odor treatment. The device comprises a gas-collecting hood, a two-stage deodorization tower, a two-stage electrocatalytic oxidation device, an exhaust fan and an exhaust funnel, the deodorization tower comprises a spray head, filler and a circulating water tank, the electrocatalytic oxidation device comprises a dosing water tank, a dosing pump, a filter and an electrolytic bath, odor collected by the gas-collecting hood enters the deodorization tower, and the odor is absorbed through spraying of outlet water of the electrocatalytic oxidation device. Odor is absorbed and oxidized in the deodorization tower, and the sprayed solution enters the circulating water tank and then continuously enters the electrocatalytic oxidation device. According to the utility model, a two-stage deodorization mode is adopted, the odor is subjected to oxidation treatment by utilizing oxidizing substances generated by electrocatalytic oxidation, no secondary pollutants are generated in the process, the treatment effect is good, and the operation cost is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of odor treatment, and in particular relates to a device for treating odor by electrocatalytic oxidation. Background Art

[0002] With the development of society, people gradually pay more attention to environmental governance and the application of environmental protection technology in my country. However, in the process of sewage treatment, due to the presence of many harmful substances in industrial wastewater and domestic sewage, corresponding odors will be released, causing great pollution to the atmosphere and seriously affecting people's quality of life and health. Therefore, it is imperative to strengthen the odor control work in the sewage treatment and solid waste treatment industries.

[0003] At present, many advanced deodorization technologies have been integrated into the development of various industries, and activated carbon adsorption deodorization technology, ion deodorization method and other technologies have been introduced, which can effectively avoid secondary pollution problems.

[0004] Since the reaction time between gas and high-energy ions using the high-energy ion method is short, most high-energy ions decrease in the atmosphere after contacting with gas. The rate of decrease is relatively fast, and their service life is relatively short, which will also increase the corresponding capital cost. Secondly, high-energy ions have a certain corrosive effect on equipment, causing the equipment to be oxidized.

[0005] The adsorption effect of activated carbon is easily affected by external factors. For example, a high temperature of the odor will affect its adsorption effect. Or a high dust content in the odor will cause a certain blockage of the activated carbon and reduce its adsorption effect. It is more common in some wastewater treatments with small air volume, low dust content in the odor and low odor concentration. In some large-scale waste gas treatments, due to the high capital cost required, activated carbon adsorption deodorization is generally not selected.

[0006] Biological deodorization has extremely high requirements for sewage treatment process control. Once the system breaks down, all work will be in vain, and a lot of money will be wasted, and a lot of residual sludge cannot be treated. Therefore, this method is relatively rare in sewage treatment and solid waste treatment.

[0007] The hydrogen sulfide gas and ammonia gas generated in the sewage treatment process are gases that are easily soluble in water. Therefore, water washing is performed using the characteristics of being easily soluble in water to convert the gas into a liquid, and the liquid is easy to store and not easy to diffuse. At the same time, the water washing deodorization method is relatively simple to operate and has low investment costs, but it also has certain defects. It requires a large amount of water resources for circulation, and the deodorization effect is average. The chemical absorption method uses different chemical reactions produced by different odors, and the corresponding chemical agents are added to absorb the chemical reactions. However, this deodorization method requires a large amount of capital investment. Secondly, the agents will cause secondary pollution to the environment. Therefore, the chemical absorption method is rarely used at this stage. Utility Model Content

[0008] The purpose of the utility model is to provide a device for treating odor by electrocatalytic oxidation, so as to solve the problems raised in the above-mentioned background technology, improve the odor treatment effect, reduce the operating cost, and reduce secondary pollutants.

[0009] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0010] A device for treating odor by electrocatalytic oxidation comprises a deodorizing tower and an electrolytic cell. Oxidizing substances generated by the electrocatalytic oxidation device are used to absorb and oxidize the odor in the deodorizing tower to remove reducing substances in the odor, thereby effectively removing pollutants in the odor.

[0011] Furthermore, the entire device includes: an air collecting hood, a two-stage deodorizing tower, a two-stage electrocatalytic oxidation device, an exhaust fan and an exhaust pipe.

[0012] Furthermore, the deodorizing tower comprises a nozzle, a filler and a circulating water tank; the electrocatalytic oxidation device comprises a dosing water tank, a dosing pump, a filter and an electrolytic cell.

[0013] Furthermore, the two-stage deodorization tower includes a first deodorization tower and a second deodorization tower, wherein the bottom of the first deodorization tower is connected to a first induced draft fan and a first circulating water tank, and the top of the first deodorization tower is connected to a second induced draft fan; the bottom of the second deodorization tower is connected to a second induced draft fan, and the top of the second deodorization tower is connected to an exhaust fan.

[0014] Furthermore, the two-stage electrocatalytic oxidation device includes a first electrocatalytic oxidation device and a second electrocatalytic oxidation device; the first electrocatalytic oxidation device includes: a first dosing water tank, a first dosing pump, a first filter and a first electrolytic cell; the second electrocatalytic oxidation device includes: a second dosing water tank, a second dosing pump, a second filter and a second electrolytic cell; the first electrolytic cell is connected to the nozzle of the first deodorization tower, and the second electrolytic cell is connected to the nozzle of the second deodorization tower.

[0015] Furthermore, the first circulating water tank and the second circulating water tank are aerated and stirred by a blower, a liquid collecting pipe is arranged at the bottom of the deodorization tower, the collecting pipe is inserted below the liquid level of the circulating water tank, and the first circulating water tank and the second circulating water tank are provided with baffles to divide the circulating water tank into three zones, the first zone is connected to the collecting pipe and the dosing pump, and the third zone is connected to the circulating pump.

[0016] Furthermore, the filter is a multi-media filter or a security filter, and the filter is arranged in front of the electrolytic cell.

[0017] Furthermore, the electrolytic cell uses sodium chloride solution as electrolyte, the sodium chloride concentration is 3-5%, the electrolytic cell uses DSA electrode as anode, and stainless steel or titanium plate as cathode.

[0018] Furthermore, the dosing water tank stores sodium carbonate solution, and the dosing pump is used to add the sodium carbonate solution into the circulating water tank to adjust the pH and alkalinity of the solution.

[0019] Furthermore, a pH meter, a liquid level meter, and a conductivity meter are installed in the circulating water tank.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] (1) The present invention can effectively absorb particulate matter, dust and droplets contained in odor, remove impurities in the absorption liquid through a filter, and prevent the impurities from affecting the operation and service life of the treatment equipment;

[0022] (2) The two-stage deodorization tower and two-stage electrocatalytic oxidation can effectively remove pollutants such as ammonia, hydrogen sulfide and VOCs in the odor;

[0023] (3) The chemicals generated by electricity are used to absorb and react to odor, effectively reducing secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic diagram of the structure of a device for treating odor by electrocatalytic oxidation.

[0025] In the figure: 1-odor source; 2-gas collecting hood; 3-first induced draft fan; 4-first deodorizing tower; 5-second deodorizing tower; 6-second induced draft fan; 7-filler; 8-nozzle; 9-first dosing water tank; 10-first dosing pump; 11-first circulating water tank; 12-first circulating pump; 13-first filter; 14-first electrolytic cell; 15-blower; 16-second circulating water tank; 17-second circulating pump; 18-second dosing pump; 19-second filter; 20-second electrolytic cell; 21-second dosing water tank; 22-exhaust fan; 23-exhaust pipe. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 As shown, a device for treating odor by electrocatalytic oxidation includes a gas collecting hood 2, a two-stage deodorizing tower, a two-stage electrocatalytic oxidation device, an exhaust fan 22 and an exhaust pipe 23. The deodorizing tower includes a nozzle 8, a filler 7, and a circulating water tank. The electrocatalytic oxidation device includes a dosing water tank, a dosing pump, a filter, and an electrolytic cell.

[0028] The two-stage deodorization tower includes a first deodorization tower 4 and a second deodorization tower 5. The bottom of the first deodorization tower 4 is connected to the first induced draft fan 3 and the first circulating water tank 11, the top of the first deodorization tower 4 is connected to the second induced draft fan 6, the bottom of the second deodorization tower 5 is connected to the second induced draft fan 6, and the top of the second deodorization tower 5 is connected to the exhaust fan 22.

[0029] The two-stage electrocatalytic oxidation device includes a first dosing water tank 9, a first dosing pump 10, a first filter 13, a first electrolytic cell 14, a second dosing water tank 21, a second dosing pump 18, a second filter 19, and a second electrolytic cell 20. The first electrolytic cell 14 is connected to the nozzle of the first deodorizing tower 4, and the second electrolytic cell 20 is connected to the nozzle of the second deodorizing tower 5.

[0030] The first circulating water tank 11 and the second circulating water tank 16 are aerated and stirred by a blower 15. A liquid collecting pipe is provided at the bottom of the deodorizing tower. The liquid collecting pipe is inserted below the liquid level of the circulating water tank. The first circulating water tank 11 and the second circulating water tank 16 are provided with baffles to divide the circulating water tank into three zones. The first zone is connected to the liquid collecting pipe and the dosing pump, and the third zone is connected to the circulating pump.

[0031] The filter adopts a multi-media filter or a security filter, and the filter is arranged in front of the electrolytic cell.

[0032] The electrolytic cell uses sodium chloride solution as electrolyte, the sodium chloride concentration is 3-5%, the electrolytic cell uses DSA electrode as anode, and stainless steel or titanium plate as cathode.

[0033] The sodium carbonate solution is stored in the dosing water tank, and the sodium carbonate solution is added to the circulating water tank by a dosing pump to adjust the pH and alkalinity of the solution.

[0034] A pH meter, a liquid level meter, and a conductivity meter are installed in the circulating water tank. The pH value is used to control the operation of the dosing water tank and the dosing pump, the liquid level meter is used to control the water replenishment of the circulating water tank, and the conductivity is used to monitor the changes in the salt content in the solution.

[0035] Example 1

[0036] The device of the present invention is used to treat a certain odor source, the main components of which are substances such as hydrogen sulfide, ammonia and volatile fatty acids. The filter adopts a multi-media filter, the anode of the electrolytic cell adopts a titanium-coated ruthenium electrode, and the cathode adopts a stainless steel electrode.

[0037] Specifically, the odor is collected by the air collecting hood 2 and sent into the first deodorizing tower 4 through the first induced draft fan 3. The first deodorizing tower 4 is equipped with a filler 7. The bottom of the first deodorizing tower 4 is connected to the first circulating water tank 11. The first circulating water tank 11 stores the output water of the electrolytic cell 14. The output water of the electrolytic cell 14 is first sprayed on the filler 7 through the nozzle 8. The odor is absorbed and oxidized by the spray liquid on the filler 7. The spray liquid flows into the circulating water tank from the bottom of the deodorizing tower.

[0038] The impurities generated in the first circulating water tank 11 are filtered by the filter 13, and when the filter 13 is clogged, the filter is backwashed.

[0039] The odor treated by the first deodorizing tower 4 is sent to the second deodorizing tower 5 by the second induced draft fan 6, and the odor is absorbed and oxidized again by spraying the effluent water of the electrolytic cell.

[0040] Specifically, during the operation of the device, since the oxidation reaction consumes alkalinity, the alkalinity needs to be supplemented according to the change in the pH of the solution. When the conductivity of the solution in the circulating water tank decreases, the sodium chloride solution needs to be supplemented.

[0041] The odor after being treated by the two-stage deodorization tower is sent into the exhaust pipe 23 by the exhaust fan 22 and then discharged into the atmosphere.

[0042] Specifically, the residence time of the spray liquid in the circulating water tank is 2 to 3 hours, and the current density of the electrolytic cell is 100 to 200 A / m 2 .

[0043] The utility model utilizes a deodorizing tower to absorb odor, utilizes oxidizing substances generated by electro-oxidation to remove reducing substances such as ammonia, hydrogen sulfide, VOCs, etc. in the odor, and can effectively remove pollutants in the odor.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for treating odor by electrocatalytic oxidation, characterized in that: The invention comprises a deodorizing tower, an electrolytic cell, a gas collecting hood (2), a two-stage deodorizing tower, a two-stage electrocatalytic oxidation device, an exhaust fan (22) and an exhaust pipe (23); the deodorizing tower comprises a nozzle (8), a filler (7) and a circulating water tank; the two-stage electrocatalytic oxidation device comprises a first electrocatalytic oxidation device and a second electrocatalytic oxidation device; the first electrocatalytic oxidation device comprises: a first dosing water tank (9), a first dosing pump (10), a first filter (13) and a first electrolytic cell (14); the second electrocatalytic oxidation device comprises: a second dosing water tank (21), a second dosing pump (18), a second filter (19) and a second electrolytic cell (20); the first electrolytic cell (14) is connected to the nozzle of the first deodorizing tower (4), and the second electrolytic cell (20) is connected to the nozzle of the second deodorizing tower (5).

2. The device for treating odor by electrocatalytic oxidation according to claim 1, characterized in that: The two-stage deodorizing tower comprises a first deodorizing tower (4) and a second deodorizing tower (5); the first deodorizing tower (4) is connected to a first induced draft fan (3) and a first circulating water tank (11) at its bottom, and connected to a second induced draft fan (6) at its top; the second deodorizing tower (5) is connected to the second induced draft fan (6) at its bottom, and connected to an exhaust fan (22) at its top.

3. The device for treating odor by electrocatalytic oxidation according to claim 2, characterized in that: The first circulating water tank (11) and the second circulating water tank (16) are aerated and stirred by a blower (15). A liquid collecting pipe is provided at the bottom of the deodorizing tower. The collecting pipe is inserted below the liquid level of the circulating water tank. The first circulating water tank (11) and the second circulating water tank (16) are provided with baffles to divide the circulating water tanks into three zones. The first zone is connected to the collecting pipe and the dosing pump, and the third zone is connected to the circulating pump.

4. The device for treating odor by electrocatalytic oxidation according to claim 1, characterized in that: The filter adopts a multi-media filter or a security filter, and the filter is arranged in front of the electrolytic cell.

5. The device for treating odor by electrocatalytic oxidation according to claim 1, characterized in that: The electrolytic cell uses sodium chloride solution as electrolyte, the sodium chloride concentration is 3-5%, the electrolytic cell uses DSA electrode as anode, and stainless steel or titanium plate as cathode.

6. The device for treating odor by electrocatalytic oxidation according to claim 1, characterized in that: The dosing water tank stores a sodium carbonate solution, and a dosing pump is used to add the sodium carbonate solution into the circulating water tank to adjust the pH and alkalinity of the solution.

7. The device for treating odor by electrocatalytic oxidation according to claim 1, characterized in that: A pH meter, liquid level meter and conductivity meter are installed in the circulating water tank.

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