Biochemical waste gas treatment device

Abstract

The utility model discloses a biochemical waste gas treatment device, which belongs to the technical field of chemical tail gas treatment, and comprises a waste gas collecting cover, the waste gas collecting cover is erected above a biochemical pool through a support frame, and the waste gas collecting cover is connected with a bent pipe arranged in a buffer tank through a gas phase pipeline; the top of the buffer tank is connected with an absorption tower through a gas phase pipeline, the upper part of the absorption tower is provided with a second-section nozzle and a second-section filler, the middle part of the absorption tower is provided with a first-section nozzle and a first-section filler, and the top of the absorption tower is connected with a first activated carbon adsorption box or a second activated carbon adsorption box through a gas phase pipeline; the first activated carbon adsorption box and the second activated carbon adsorption box are connected with a negative pressure fan through gas phase pipelines. The utility model solves the problems that the existing biochemical pool is arranged in the open air, the odor generated in the wastewater treatment process drifts away along with the wind, and the human health and environmental protection are not facilitated. The biochemical tail gas treatment device can effectively absorb and treat biochemical tail gas and reduce environmental pollution.

Description

Technical Field

[0001] This utility model relates to the field of chemical waste gas treatment technology, specifically a biochemical waste gas treatment device. Background Technology

[0002] Activated sludge is a commonly used biological treatment method. It involves introducing microorganisms into an aeration tank and mixing them with wastewater. The metabolic activity of the microorganisms treats the wastewater, effectively reducing indicators such as COD and ammonia nitrogen. However, the process generates a large amount of odorous gas, impacting the environment and human health. Therefore, research on biochemical exhaust gas treatment devices is of great significance.

[0003] The existing biological treatment ponds are set up in the open air, and the odor generated during the wastewater treatment process is dispersed by the wind, which is detrimental to human health and environmental protection. Therefore, it is necessary to treat the exhaust gas. Utility Model Content

[0004] The purpose of this invention is to provide a biochemical waste gas treatment device that can effectively absorb and treat biochemical exhaust gas, reduce environmental pollution, and solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A biochemical waste gas treatment device includes a waste gas collection hood, which is supported above a biochemical tank by a support frame. The waste gas collection hood is connected to a bend in a buffer tank via a gas phase pipe. The top of the buffer tank is connected to an absorption tower via a gas phase pipe. The upper part of the absorption tower is provided with two sections of nozzles and two sections of packing. The middle part of the absorption tower is provided with one section of nozzles and one section of packing. The top of the absorption tower is connected to a first activated carbon adsorption box and a second activated carbon adsorption box via a gas phase pipe. Both the first and second activated carbon adsorption boxes are connected to a negative pressure fan via gas phase pipes.

[0007] Preferably, the upper part of the buffer tank is provided with a metal mesh for intercepting impurities, and the bottom of the buffer tank is provided with a drain outlet.

[0008] Preferably, a level gauge is installed at the bottom of the absorption tower, and a bottom circulation pump is connected to the bottom of the absorption tower via a pipeline. The bottom circulation pump is connected to a nozzle via a pipeline, and a packing material is installed below the nozzle.

[0009] Preferably, a liquid collector is provided at the top of the absorption tower, the liquid collector is connected to a two-stage circulation pump through a pipeline, the two-stage circulation pump is connected to two-stage nozzles through a pipeline, and two-stage packing is provided below the two-stage nozzles.

[0010] Preferably, a drain port is provided on the pipeline connecting the bottom circulation pump and the first-stage nozzle, and a replenishment port is provided on the pipeline connecting the liquid collector and the second-stage circulation pump.

[0011] Preferably, a first valve is installed on the connecting pipe at the front end of the first activated carbon adsorption box, a second valve is installed on the connecting pipe at the rear end of the first activated carbon adsorption box, a third valve is installed on the connecting pipe at the front end of the second activated carbon adsorption box, and a fourth valve is installed on the connecting pipe at the rear end of the second activated carbon adsorption box.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention features a buffer tank to initially remove impurities entrained in the gas, reducing their impact on subsequent treatment. It also includes two spray towers for secondary spray absorption of the exhaust gas, enhancing mass transfer. Two sets of activated carbon adsorption boxes are provided, allowing switching to the other set when replacing activated carbon without affecting normal operation. This design effectively absorbs and treats biochemical exhaust gas, reducing environmental pollution. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the biochemical waste gas treatment device of this utility model;

[0015] Figure 2 This is a structural diagram of the absorption tower of this utility model.

[0016] In the diagram: 1. Waste gas collection hood; 11. Support frame; 2. Buffer tank; 21. Metal interception net; 22. Sewage outlet; 23. Bend; 3. Absorption tower; 31. Liquid level gauge; 32. Bottom circulation pump; 33. Second-stage circulation pump; 34. Liquid collector; 35. First-stage packing; 36. Second-stage packing; 37. First-stage nozzle; 38. Second-stage nozzle; 39. Liquid inlet; 310. Drain outlet; 41. First activated carbon adsorption box; 411. First valve; 412. Second valve; 42. Second activated carbon adsorption box; 421. Third valve; 422. Fourth valve; 5. Negative pressure fan. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] To address the technical problem of existing open-air biological treatment ponds causing odors to disperse with the wind during wastewater treatment, posing risks to human health and environmental protection, please refer to [link to relevant documentation]. Figures 1-2This embodiment provides the following technical solution:

[0019] A biochemical waste gas treatment device includes a waste gas collection hood 1, which is mounted above a biochemical tank via a support frame 11.

[0020] It should be noted that the exhaust gas collection hood 1 is in the shape of an inverted V, with a support frame 11 at the bottom. The exhaust gas collection hood 1 is supported above the biological treatment tank by the support frame 11, so that the exhaust gas collection hood 1 and the biological treatment tank maintain a certain gap, which is conducive to the flow of fresh air.

[0021] The exhaust gas collection hood 1 is connected to the bend 23 installed inside the buffer tank 2 through a gas phase pipe. The bend 23 is the exhaust gas inlet and is oriented downwards, so that impurities entrained in the exhaust gas are collected below the buffer tank 2 under the influence of the airflow direction.

[0022] In this embodiment, the upper part of the buffer tank 2 is provided with a metal mesh 21 for intercepting impurities. The metal mesh 21 can further intercept impurities entrained in the gas phase and can be disassembled for easy cleaning. The bottom of the buffer tank 2 is provided with a drain port 22, which can be opened at any time to discharge impurities inside the buffer tank 2.

[0023] The top of the buffer tank 2 is connected to the absorption tower 3 through a gas phase pipeline. The upper part of the absorption tower 3 is equipped with two-stage nozzles 38 and two-stage packing 36, and the middle part of the absorption tower 3 is equipped with one-stage nozzle 37 and one-stage packing 35.

[0024] In this embodiment, a level gauge 31 is installed at the bottom of the absorption tower 3, and the bottom of the absorption tower 3 is connected to a bottom circulation pump 32 through a pipeline. The bottom circulation pump 32 is connected to a nozzle 37 through a pipeline, and a packing 35 is installed below the nozzle 37.

[0025] In this embodiment, a liquid collector 34 is provided at the top of the absorption tower 3. The liquid collector 34 is connected to a second-stage circulation pump 33 through a pipeline. The second-stage circulation pump 33 is connected to a second-stage nozzle 38 through a pipeline. A second-stage packing 36 is provided below the second-stage nozzle 38.

[0026] In this embodiment, a drain port 310 is provided on the pipeline connecting the bottom circulation pump 32 and the first-stage nozzle 37, and a replenishment port 39 is provided on the pipeline connecting the liquid collector 34 and the second-stage circulation pump 33.

[0027] It should be noted that the absorption tower 3 is configured as a two-stage spray type, with a first-stage packing 35, a first-stage nozzle 37, a second-stage packing 36, and a second-stage nozzle 38 inside. The second-stage spray liquid is collected by the liquid collector 34 for recirculation. When the absorbent liquid in the absorption tower 3 needs to be replaced, the absorbent liquid can be discharged through the drain port 310, and new absorbent liquid can be added through the replenishment port 39.

[0028] The top of the absorption tower 3 is connected to the first activated carbon adsorption box 41 and the second activated carbon adsorption box 42 through a gas phase pipeline. Both the first activated carbon adsorption box 41 and the second activated carbon adsorption box 42 are connected to the negative pressure fan 5 through a gas phase pipeline.

[0029] It should be noted that the negative pressure fan 5 is installed at the end of the activated carbon adsorption box. It provides power to the gas phase of the entire system by drawing air under negative pressure and draws out the qualified exhaust gas through the negative pressure fan 5 for organized emission.

[0030] In this embodiment, a first valve 411 is installed on the connecting pipe at the front end of the first activated carbon adsorption box 41, a second valve 412 is installed on the connecting pipe at the rear end of the first activated carbon adsorption box 41, a third valve 421 is installed on the connecting pipe at the front end of the second activated carbon adsorption box 42, and a fourth valve 422 is installed on the connecting pipe at the rear end of the second activated carbon adsorption box 42.

[0031] It should be noted that two sets of activated carbon adsorption boxes of the same size are set up, namely the first activated carbon adsorption box 41 and the second activated carbon adsorption box 42. Valves are installed at the front and rear of both the first activated carbon adsorption box 41 and the second activated carbon adsorption box 42, so that when the activated carbon is replaced, the inlet and outlet gas can be cut off and the exhaust gas can be adsorbed through the other activated carbon adsorption box.

[0032] Working principle: The exhaust gas collection hood 1 is supported by a support frame 11 above the biological treatment tank. A negative pressure fan 5 draws in the exhaust gas from the biological treatment tank. After being collected by the exhaust gas collection hood 1, the exhaust gas enters the buffer tank 2. A bend 23 is installed after the gas phase pipeline enters the buffer tank 2, which facilitates the settling of entrained particles at the bottom of the buffer tank 2. A metal mesh 21 is installed at the top of the buffer tank 2 to further intercept impurities and prevent them from entering subsequent treatment stages along with the gas phase pipeline. A drain port 22 is installed at the bottom of the buffer tank 2, which can be opened during maintenance to discharge internal impurities. After passing through the buffer tank 2, the exhaust gas enters the absorption tower 3. The absorption tower 3 has two stages of spray absorption and two stages of packing layers. The bottom liquid is transported to the middle of the tower by the bottom circulation pump 32. The spray nozzles 37 ensure that the spray liquid is evenly distributed within the tower. After passing through the packing 35, it fully contacts the gas phase. The liquid in the upper part of the tower is collected by the liquid collector 34 and transported to the top of the tower by the second-stage circulation pump 33. It is then sprayed by the second-stage spray nozzles 38 and passes through the second-stage packing 36 to fully contact the gas phase. The absorption tower 3 is also equipped with a level gauge 31, a liquid replenishment port 39, and a liquid discharge port 310. When the absorbent in the absorption tower 3 needs to be replaced, the liquid can be replenished through the liquid replenishment port 39 and discharged through the liquid discharge port 310. The exhaust gas after absorption and treatment by the absorption tower 3 enters the first activated carbon adsorption box 41 or the second activated carbon adsorption box 42. The activated carbon further adsorbs the organic matter and other impurities in the exhaust gas, so that the exhaust gas meets the emission standards. The entire system is powered by a negative pressure fan 5.

[0033] In summary, setting up buffer tank 2 can initially remove impurities entrained in the gas, reducing the impact on subsequent treatment. Setting up two-stage spray towers allows for secondary spray absorption of the exhaust gas, enhancing mass transfer. Setting up two sets of activated carbon adsorption boxes allows switching to the other set when replacing activated carbon without affecting normal operation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biochemical exhaust gas treatment device comprising an exhaust gas collecting hood (1), characterized in that: The waste gas collecting cover (1) is supported above the biochemical pool by the support frame (11), the waste gas collecting cover (1) is connected with the elbow (23) arranged in the buffer tank (2) through the gas phase pipeline, the top of the buffer tank (2) is connected with the absorption tower (3) through the gas phase pipeline, the upper part of the absorption tower (3) is provided with the two-stage spray head (38) and the two-stage filler (36), the middle part of the absorption tower (3) is provided with the one-stage spray head (37) and the one-stage filler (35), the top of the absorption tower (3) is connected with the first activated carbon adsorption box (41) and the second activated carbon adsorption box (42) through the gas phase pipeline, and the first activated carbon adsorption box (41) and the second activated carbon adsorption box (42) are connected with the negative pressure fan (5) through the gas phase pipeline.

2. The biochemical exhaust treatment device according to claim 1, characterized in that: The upper part of the buffer tank (2) is provided with the metal intercepting net (21) for intercepting impurities, and the bottom of the buffer tank (2) is provided with the blowdown port (22).

3. The biochemical exhaust treatment device according to claim 1, characterized in that: The lower part of the absorption tower (3) is provided with the liquid level meter (31), the bottom of the absorption tower (3) is connected with the tower bottom circulating pump (32) through the pipeline, the tower bottom circulating pump (32) is connected with the one-stage spray head (37) through the pipeline, and the one-stage filler (35) is arranged below the one-stage spray head (37).

4. The biochemical exhaust treatment device according to claim 3, characterized in that: The upper part of the absorption tower (3) is provided with the liquid collector (34), the liquid collector (34) is connected with the two-stage circulating pump (33) through the pipeline, the two-stage circulating pump (33) is connected with the two-stage spray head (38) through the pipeline, and the two-stage filler (36) is arranged below the two-stage spray head (38).

5. The biochemical exhaust treatment device according to claim 4, characterized in that: The pipeline, in which the tower bottom circulating pump (32) is connected with the one-stage spray head (37), is provided with the liquid discharge port (310), and the pipeline, in which the liquid collector (34) is connected with the two-stage circulating pump (33), is provided with the liquid supplement port (39).

6. The biochemical exhaust treatment device according to claim 1, characterized in that: The first valve (411) is installed on the connecting pipeline at the front end of the first activated carbon adsorption box (41), the second valve (412) is installed on the connecting pipeline at the rear end of the first activated carbon adsorption box (41), the third valve (421) is installed on the connecting pipeline at the front end of the second activated carbon adsorption box (42), and the fourth valve (422) is installed on the connecting pipeline at the rear end of the second activated carbon adsorption box (42).

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