A sewage treatment VOCs gas treatment system and method

Abstract

The application discloses a sewage treatment VOCs gas treatment system and method, relates to the sewage VOCs waste gas treatment technical field, and the system comprises a vertical cylindrical adsorption tank, a tangential waste gas pipe is arranged at a horizontal tangent position of an upper portion of a side wall of the adsorption tank, an air outlet pipe is arranged laterally at a bottom portion, a regeneration pipe is arranged at a center of a top portion, and a discharge pipe is arranged at a center of the bottom portion; a self-driving assembly is coaxially arranged in a cavity of the adsorption tank, rotation power is provided by means of tangential air inlet cyclone, an extrusion roller assembly is fixed on the self-driving assembly, and an activated carbon adsorption filler layer is coaxially arranged on an upper side of the roller. The filler layer sleeve container is divided into four activated carbon filler cavities, a porous elastic diaphragm is arranged at the bottom of the cavity, a hollow jacking shaft and a multilayer stirring assembly are matched in the cavity, and a pre-loosening assembly is arranged at the center of the bottom surface of the diaphragm. The application has the advantages that the cyclone air inlet airflow is uniformly distributed, there is no external driving motor, electrical faults are eliminated, the filler has no adsorption dead angle, regeneration and desorption are sufficient, and the operation and maintenance cost and the activated carbon replacement cost are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater VOCs waste gas treatment technology, specifically to a wastewater VOCs gas treatment system and method. Background Technology

[0002] The VOCs generated during wastewater treatment are mixed with organic pollutants, dust, and colloidal impurities. Direct emission of these gases can easily pollute the atmosphere and harm human health. Currently, the industry mostly uses activated carbon adsorption devices for treatment, but traditional equipment has many drawbacks: traditional straight-pipe direct-inlet air intake can easily cause airflow turbulence and short-circuiting, with waste gas concentrating through a portion of the packing material, leaving most of the activated carbon idle, resulting in low packing material utilization and large fluctuations in purification effect; the equipment lacks an independent material turning structure, allowing dust and colloidal substances carried by the waste gas to adhere to the surface of the activated carbon for a long time, and the packing material is prone to caking and clogging micropores after static compaction, increasing ventilation resistance, increasing energy consumption, and requiring frequent shutdowns. Manual cleaning results in high maintenance costs. Some equipment with loose material structures relies on external motors to drive the turning components, which are complex in structure, prone to leaks, and prone to electrical failures. Moreover, relying solely on simple vibrations makes it impossible to precisely scrape off the scale on the surface of the packing due to the adsorption dead zone in the center of the cavity. At the same time, traditional equipment lacks a buffer and protection structure, and the direct friction between the roller and the elastic diaphragm can easily cause damage, resulting in high spare parts consumption. During packing regeneration, the entire process is statically stacked, resulting in uneven contact between steam, eluent, and activated carbon. Deeply adsorbed pollutants are not completely desorbed, the adsorption capacity of activated carbon decays rapidly, and the frequency of replacement is high, leading to high overall operating costs. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention adopts the following technical solution: a wastewater treatment VOCs gas treatment system, comprising a vertical cylindrical adsorption tank, which serves as the supporting substrate of the entire system. A tangential exhaust gas pipe is provided at a horizontal tangential position on the upper side wall of the adsorption tank, which is used to introduce VOCs exhaust gas into the tank along the tangential direction. An exhaust pipe extends laterally from the bottom of the adsorption tank to discharge tail gas that has met the standards after being purified by activated carbon adsorption. A self-driving assembly is coaxially arranged in the inner cavity of the adsorption tank. The self-driving assembly relies on the swirling flow formed by the tangential air intake to provide rotational power. A compression roller assembly is fixedly mounted on the self-driving assembly. An activated carbon adsorption packing layer is coaxially sleeved on the upper side of the extrusion roller assembly. The activated carbon adsorption packing layer is coaxially arranged around the outside of the self-driven assembly. The extrusion roller assembly rotates synchronously with the self-driven assembly. During the rotation, it periodically presses upward against the packing layer to loosen the packing. After being dispersed by swirling, the waste gas passes evenly through the activated carbon adsorption packing layer to complete the adsorption and purification of pollutants. A regeneration pipe for introducing high-temperature steam or eluent is set at the center of the top of the adsorption tank. A discharge pipe for discharging the desorbed waste liquid and waste gas is also set at the center of the bottom of the adsorption tank. Valves are installed on the tangential waste gas pipe, the outlet pipe, the regeneration pipe, and the discharge pipe.

[0004] Furthermore, the self-driving assembly includes an annular fixing frame fixedly installed on the bottom side wall of the adsorption tank. A bearing is fixedly installed at the center of the annular fixing frame. A rotating shaft is installed on the inner ring of the bearing. The upper end of the rotating shaft extends to a position close to the top of the adsorption tank. A drive blade is fixedly installed at the top of the rotating shaft. The drive blade is directly opposite the air outlet of the tangential exhaust pipe.

[0005] Furthermore, the activated carbon adsorption packing layer includes a sleeve container fixedly attached to the inner wall of the adsorption tank. The sleeve container is evenly divided into four independent activated carbon packing cavities, and each activated carbon packing cavity is filled with adsorbed activated carbon. The upper end face of the sleeve container is entirely covered with an annular mesh disk, which adopts a hollow mesh disk structure. The bottom of the sleeve container is entirely sealed with a porous elastic membrane, and the surface of the porous elastic membrane is densely covered with air-permeable micropores.

[0006] Furthermore, the extrusion roller assembly includes four spindles fixedly connected to the lower end of the rotating shaft. The four spindles are symmetrically distributed in pairs around the rotating shaft. Each spindle has a freely rotating extrusion roller fitted on its outer end. The rotational trajectory of all extrusion rollers is directly opposite the lower surface of the porous elastic diaphragm. When the rotating shaft rotates continuously in a circular motion with the drive blade, the multiple sets of extrusion rollers will periodically and sequentially impact and press upward against the porous elastic diaphragm, causing the porous elastic diaphragm to intermittently bulge upward and deform.

[0007] Furthermore, each activated carbon packing cavity is equipped with an internal turning component. The internal turning component includes a lifting shaft arranged vertically at the center of the activated carbon packing cavity. The lifting shaft is a hollow rod structure with a hollow interior. The upper end of the lifting shaft extends to the annular mesh disk, and the lower end extends downward to the porous elastic diaphragm. Multiple sets of horizontally arranged turning components are arranged at intervals along the vertical direction on the lifting shaft. The outer ring of each set of turning components is fixedly connected to the inner wall of the activated carbon packing cavity by multiple limiting ropes.

[0008] Furthermore, the stirring assembly includes an arc-shaped stirring elastic membrane, with multiple reinforcing ribs evenly arranged radially on the stirring elastic membrane, and protruding particles densely distributed on the stirring elastic membrane.

[0009] Furthermore, a pre-loosening component is fixedly installed at the center of the bottom surface of the porous elastic diaphragm. The pre-loosening component includes an air storage plate, a sealing piston, a hemispherical extrusion head, a return spring, and a gas channel. The top surface of the air storage plate is completely sealed and fixed to the center of the lower surface of the porous elastic diaphragm. A vertically penetrating gas channel is opened at the center of the air storage plate. The top of the hollow cavity of the lifting shaft is sealed and connected to the gas channel, and the internal air passages of the two are connected. Multiple micro-holes are evenly opened along the circumference of the lifting shaft. The micro-holes are connected to the hollow cavity inside the lifting shaft. A hemispherical extrusion head is assembled at the bottom of the pre-loosening component. A sealing piston that cooperates with the air storage plate is installed at the top of the hemispherical extrusion head. A return spring is assembled between the sealing piston and the air storage plate.

[0010] Furthermore, the adsorption tank is provided with a regeneration pipe at the top center for introducing high-temperature steam or eluent, and a discharge pipe is provided at the bottom center for discharging the desorbed waste liquid and waste gas.

[0011] This invention also describes a method for treating VOCs gas in wastewater treatment, the specific steps of which are as follows: S1. Swirl-flow adsorption: Wastewater VOCs waste gas is sent into the adsorption tank along the tangential direction through the tangential waste gas pipe to form a swirling flow. The airflow impacts and drives the blades to rotate the self-driven assembly and the extrusion roller assembly. The waste gas enters the activated carbon packing cavity evenly through the annular mesh for adsorption and purification. The clean gas passes through the porous elastic membrane and is discharged from the outlet pipe. S2, Turning Packing: The extrusion roller periodically presses against the porous elastic diaphragm, driving the lifting shaft to drive the turning component to turn the activated carbon; the extrusion roller impacts the hemispherical extrusion head to compress the gas in the gas storage pan, and the high-pressure gas is sprayed out from the micro air holes of the lifting shaft to flush the packing and prevent the activated carbon from caking and clogging. S3. Close the gas path after saturation: When the activated carbon adsorption is saturated, close the tangential waste gas pipe and the outlet pipe to cut off the waste gas flow. S4. Regeneration and Restoration: High-temperature steam or eluent is introduced through the regeneration pipe. The air intake maintains the low-speed rotation of the self-driven component to disturb the packing. The regeneration medium fully washes away the activated carbon. The desorption waste liquid and waste gas are discharged through the discharge pipe. After regeneration is completed, the air intake is restarted to restore the adsorption operation.

[0012] The beneficial effects of this invention compared with the prior art are: (1) In this invention, the exhaust gas is introduced along the tangent of the tank to form a uniform swirling flow, which is combined with the secondary dispersion of the driving blades, completely solving the problem of short circuit of the airflow or partial idle packing in the traditional straight-inlet type. The exhaust gas passes through the entire activated carbon packing cavity evenly, the gas-solid contact is sufficient, the purification effect of VOCs and dust is stable, and the running resistance of the air duct and the energy consumption of the fan are reduced at the same time; (2) The packing turning mechanism of this invention relies on the airflow impact of the exhaust gas itself to drive the blades to rotate, without the need for a matching motor and transmission sealing components, simplifying the tank structure and eliminating exhaust gas leakage; eliminating electrical transmission faults, no additional drive power consumption, and suitable for 24-hour continuous operation of sewage treatment plants. (3) The extrusion roller presses the elastic diaphragm to loosen the packing as a whole, and the built-in stirring component stirs in a directional manner to eliminate the dead corner of the cavity adsorption; the roller hits the pre-loosening component to generate high pressure airflow to flush and remove dust from the inside of the packing, and the spherical buffer protective diaphragm maintains the permeability of the packing for a long time, without the need for frequent shutdowns for manual cleaning and unblocking; (4) When the activated carbon is regenerated, the air intake drives the mechanism to rotate at low speed, the packing is loosened and turned over throughout the process, and the high temperature steam or desiccant wets the carbon layer without dead corners, the pollutants in the micropores are desorbed more completely, the adsorption capacity of the activated carbon decays more slowly, the packing replacement cycle is greatly extended, and the labor cost of purchasing and replacing activated carbon is saved. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the internal structure of the adsorption tank of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the self-driving component of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of the filler layer of the present invention.

[0017] Figure 5 This is a schematic diagram of the internal structure of the filler layer of the present invention.

[0018] Figure 6 This is a schematic diagram of the inward turning component of the present invention.

[0019] Figure 7 This is a schematic diagram of the stirring component of the present invention.

[0020] Figure 8 This is a schematic diagram of the extrusion roller assembly of the present invention.

[0021] Figure 9 This is a schematic diagram of the pre-loosening component of the present invention.

[0022] Reference numerals: 1. Adsorption tank; 2. Tangential exhaust pipe; 3. Exhaust pipe; 4. Regeneration pipe; 5. Discharge pipe; 6. Packing layer; 601. Sleeve container; 602. Activated carbon packing cavity; 603. Porous elastic diaphragm; 604. Annular mesh disc; 7. Self-driving assembly; 701. Annular fixing frame; 702. Bearing; 703. Rotating shaft; 704. Drive blade; 8. Extrusion roller assembly; 801. Mandrel; 802. Extrusion roller; 9. Internal turning assembly; 901. Lifting shaft; 902. Tumbling assembly; 9021. Tumbling elastic diaphragm; 9022. Reinforcing ribs; 9023. Protruding particles; 903. Limiting rope; 10. Pre-loosening assembly; 1001. Gas storage plate; 1002. Sealing piston; 1003. Hemispherical extrusion head; 1004. Return spring; 1005. Gas flow channel. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] like Figure 1 , Figure 2 As shown, a wastewater treatment VOCs gas treatment system includes a vertical cylindrical adsorption tank 1, which serves as the supporting structure of the entire system. A tangential exhaust gas pipe 2 is installed at the upper horizontal tangential position of the side wall of the adsorption tank 1. The tangential exhaust gas pipe 2 is used to introduce VOCs waste gas into the tank along the tangential direction, creating a swirling gas field within the tank, dispersing the concentrated airflow, and avoiding the defects of uneven airflow distribution, airflow short-circuiting, or partial idle packing in traditional adsorption equipment. An exhaust pipe 3 extends laterally from the bottom of the adsorption tank 1 to discharge the tail gas that has been purified by activated carbon adsorption and meets the standards. A regeneration pipe 4 is installed at the center of the top of the adsorption tank 1 for introducing high-temperature steam or eluent. An exhaust pipe 5 is also installed at the center of the bottom of the adsorption tank 1 to discharge the desorbed waste liquid and waste gas together. The tangential exhaust gas pipe 2 and the exhaust pipe 3... Valves are installed on the air pipe 3, regeneration pipe 4, and discharge pipe 5. A self-driving component 7 is coaxially installed in the inner cavity of the adsorption tank 1. The self-driving component 7 relies on the swirling flow formed by the tangential air intake to provide rotational power. It does not require external motors and transmission mechanisms to drive the entire turning mechanism. It completes autonomous rotation by relying on the energy of the waste gas itself. An extrusion roller assembly 8 is fixedly mounted on the self-driving component 7. An activated carbon adsorption packing layer 6 is coaxially sleeved on the upper side of the extrusion roller assembly 8. The activated carbon adsorption packing layer 6 is arranged coaxially around the outside of the self-driving component 7. The extrusion roller assembly 8 rotates synchronously with the self-driving component 7. During the rotation, it periodically presses the packing layer 6 upward to loosen the packing in the packing layer 6. After being dispersed by the swirling flow, the waste gas passes evenly through the activated carbon adsorption packing layer 6 to complete the adsorption and purification of pollutants.

[0025] like Figure 3 As shown, the self-driving assembly 7 includes an annular fixing frame 701 fixedly installed on the bottom side wall of the adsorption tank 1. A bearing 702 is fixedly installed at the center of the annular fixing frame 701. A rotating shaft 703 is installed on the inner ring of the bearing 702. The upper end of the rotating shaft 703 extends to a position close to the top of the adsorption tank 1. A driving blade 704 is fixedly installed at the top of the rotating shaft 703. The driving blade 704 is directly opposite the air outlet of the tangential exhaust gas pipe 2. The high-speed exhaust gas introduced tangentially impacts the driving blade 704, which drives the rotating shaft 703 to rotate continuously. At the same time, the blade can disperse the airflow a second time, further dispersing the exhaust gas in the tank evenly.

[0026] like Figure 4 , Figure 5As shown, the activated carbon adsorption packing layer 6 includes a sleeve container 601 fixedly attached to the inner wall of the adsorption tank 1. The sleeve container 601 serves as the overall outer frame of the packing layer. The sleeve container 601 is uniformly divided into four independent activated carbon packing cavities 602, and each activated carbon packing cavity 602 is filled with adsorbed activated carbon. The upper end face of the sleeve container 601 is entirely covered with an annular mesh disk 604. The annular mesh disk 604 adopts a hollow mesh disk structure, which serves to support the upper activated carbon packing and to initially and uniformly divert the swirling waste gas falling from top to bottom, thus optimizing the airflow distribution. The bottom of the sleeve container 601 is entirely sealed with a porous elastic diaphragm 603. The porous elastic diaphragm 603 is made of wear-resistant rubber elastic material, and the surface of the diaphragm is densely covered with breathable micropores. It allows the purified gas to pass downwards and can also undergo elastic upward deformation under external force, thereby causing the internal packing to turn over and loosen.

[0027] like Figure 2 , Figure 3 , Figure 5 , Figure 8 As shown, the extrusion roller assembly 8 includes four spindles 801 fixedly connected to the lower end of the rotating shaft 703. The four spindles 801 are symmetrically distributed in pairs around the rotating shaft 703. Each spindle 801 has a freely rotatable extrusion roller 802 fitted on its outer end. The extrusion rollers 802 can rotate freely around the spindles 801. The rotational trajectory of all extrusion rollers 802 is directly facing the lower surface of the porous elastic diaphragm 603. When the rotating shaft 703 rotates continuously in a circular motion with the drive blade 704, the multiple sets of extrusion rollers 802 will periodically strike and push the porous elastic diaphragm 603 upward in sequence, causing the porous elastic diaphragm 603 to intermittently bulge upward and deform, thereby pushing the activated carbon in the activated carbon packing cavity 602 above, realizing continuous extrusion and friction of the packing and turning the packing.

[0028] like Figures 4-6 As shown, each activated carbon packing cavity 602 is equipped with an internal turning component 9. The internal turning component 9 includes a lifting shaft 901 vertically arranged at the center of the activated carbon packing cavity 602. The lifting shaft 901 is a hollow rod structure with a hollow interior. The upper end of the lifting shaft 901 extends to the annular mesh disk 604, and the lower end extends downward to the porous elastic diaphragm 603. Multiple sets of horizontally arranged turning components 902 are arranged at intervals along the vertical direction on the lifting shaft 901. Each set of turning components 902... The outer ring is fixedly connected to the inner wall of the activated carbon packing cavity 602 by multiple limiting ropes 903. The limiting ropes 903 are used to limit the vertical displacement distance of the outer ring of the stirring component 902. When the lifting shaft 901 is lifted upward, only the inner end of the stirring component 902 tilts upward synchronously with the lifting shaft 901, while the height of the outer ring remains fixed. This creates a squeezing and stirring action on the activated carbon in the central area of ​​the activated carbon packing cavity 602, breaking the caking layer formed by long-term static accumulation of activated carbon and eliminating dead corners of packing adsorption.

[0029] like Figure 7 As shown, the stirring assembly 902 includes an arc-shaped stirring elastic membrane 9021. Multiple reinforcing ribs 9022 are evenly arranged radially on the stirring elastic membrane 9021. The reinforcing ribs 9022 can maintain the overall structure of the membrane and avoid deformation and stretching damage. The stirring elastic membrane 9021 is also densely covered with protruding particles 9023. The protruding particles 9023 can increase the contact friction with the activated carbon filler and improve the effect of stirring and scraping off scale and impurities.

[0030] like Figure 5 , Figure 9 As shown, a pre-loosening assembly 10 is fixedly installed at the center of the bottom surface of the porous elastic diaphragm 603. The pre-loosening assembly 10 includes a gas storage plate 1001, a sealing piston 1002, a hemispherical extrusion head 1003, a return spring 1004, and a gas flow channel 1005. The top surface of the gas storage plate 1001 is completely sealed and fixed to the center of the lower surface of the porous elastic diaphragm 603. A vertically penetrating gas flow channel 1005 is opened in the center of the gas storage plate 1001. The top of the hollow cavity of the lifting shaft 901 is sealed and connected to the gas flow channel 1005, and the internal gas passages of the two are connected. Multiple micro-holes are evenly opened in the circumferential direction of the lifting shaft 901. The micro-holes are connected to the internal hollow cavity of the lifting shaft 901, and the gas can be injected outward in a ring through the micro-holes into the activated carbon packing in the surrounding activated carbon packing cavity 602. The pre-loosening assembly 10 is equipped with a hemispherical extrusion head 1003 at the bottom. A sealing piston 1002 that cooperates with the gas storage plate 1001 is installed on the top of the hemispherical extrusion head 1003. A return spring 1004 is installed between the sealing piston 1002 and the gas storage plate 1001. When the extrusion roller 802 rotates, it first contacts the hemispherical extrusion head 1003. The spherical contact generates impact vibration, which completes the initial loosening of the packing. When the extrusion continues, the hemispherical extrusion head 1003 overcomes the elastic force of the return spring 1004 and pushes the sealing piston 1002 upward, compressing the gas inside the gas storage plate 1001. The high-pressure gas is sent into the lifting shaft 901 along the gas flow channel 1005 and sprayed out at high speed from the micro air holes, impacting and scouring the surrounding activated carbon, assisting in the loosening of the packing, and at the same time avoiding direct friction and wear of the porous elastic diaphragm 603 by the extrusion roller 802.

[0031] Working principle: (1) Waste gas adsorption and purification: VOCs waste gas generated from sewage treatment is sent into the upper part of the vertical adsorption tank 1 at high speed through the tangential waste gas pipe 2 along the tangential direction. Unlike the traditional direct air intake, the tangential air intake can form a stable rotating swirling air field in the inner cavity of the adsorption tank 1, which disperses the concentrated airflow and avoids the problems of airflow short circuit, local airflow overload, and no gas flow in some packing from the source. The high-speed swirling waste gas impacts the drive blades 704 at the top of the self-drive assembly 7, and drives the rotating shaft 703, the annular fixed frame 701, and the extrusion roller assembly 8 to rotate continuously in a circular motion by the airflow impact force. No external power equipment such as motors is required throughout the process, which reduces the energy consumption and structural complexity of the equipment. At the same time, the rotating drive blades 704 can disperse the swirling waste gas a second time, so as to achieve uniform dispersion of waste gas in all directions in the tank. The waste gas flows downward at a uniform speed and enters the outer activated carbon adsorption packing layer 6 evenly.

[0032] The exhaust gas enters the four activated carbon packing chambers 602 separated by the sleeve container 601. The activated carbon packed in the chambers simultaneously adsorbs and filters VOCs organic pollutants, suspended dust, and colloidal impurities in the exhaust gas. The annular mesh disk 604 evenly diverts the falling airflow, ensuring that the exhaust gas comes into uniform contact with all the activated carbon packing. The purified gas passes through the porous elastic membrane 603 with micropores at the bottom for rectification and filtration, and is finally stably discharged from the gas outlet pipe 3 at the bottom side of the adsorption tank 1, completing the initial purification of VOCs exhaust gas. The discharged gas can then be fed into other VOCs purification systems in the existing technology for further treatment.

[0033] During the continuous adsorption process, the extrusion roller 802, which rotates synchronously with the rotating shaft 703, periodically impacts and pushes upward on the porous elastic diaphragm 603, causing the porous elastic diaphragm 603 to intermittently bulge upward, simultaneously pushing the packing inside the activated carbon packing cavity 602 upward. On the one hand, the mutual friction and extrusion of the packing removes the dust and colloidal scale attached to the surface of the packing, preventing blockage between the activated carbon micropores and the packing and maintaining the air permeability of the packing. On the other hand, it continuously breaks up the hardened layer formed by the static compaction of the packing. After the packing is compressed and shrinks, the air pressure in the cavity increases slightly, and the waste gas fully penetrates into the depths of the activated carbon micropores, increasing the gas-solid contact area and improving the VOCs adsorption and removal efficiency.

[0034] When the porous elastic diaphragm 603 deforms upward, it simultaneously pushes the bottom pre-loosening component 10 and the lifting shaft 901 upward. The lifting shaft 901 drives the multi-layer tumbling component 902 to move upward synchronously. Under the constraint of the limiting rope 903, the outer ring of the tumbling component 902 is fixed in height, and only the inner end is raised. It directionally squeezes and tumbles the activated carbon in the center of the packing cavity, pushing the centrally accumulated packing to the edge of the cavity, realizing the fine tumbling of the packing throughout the entire area and eliminating adsorption dead corners. The tumbling elastic diaphragm 9021 of the tumbling component 902 provides deformation margin, the reinforcing ribs 9022 prevent the diaphragm from being overstretched and damaged, and the protruding particles 9023 enhance the friction and scraping effect with the packing. When the extrusion roller 802 rotates away from the pre-loosening component 10, the return spring 1004 pushes the hemispherical extrusion head 1003 and the sealing piston 1002 to return to their original positions. The porous elastic diaphragm 603 and the inner tumbling component 9 fall back synchronously, completing one complete packing loosening cycle.

[0035] When the extrusion roller 802 contacts the pre-loosening component 10, the spherical structure of the hemispherical extrusion head 1003 first generates impact vibration, pre-loosening the activated carbon below. Continuous extrusion pressure pushes the sealed piston 1002 to compress the gas inside the gas storage pan 1001. The high-pressure gas is sent into the hollow cavity of the lifting shaft 901 through the gas flow channel 1005 and is ejected outward at high speed from the circumferential micro-pores. The airflow impacts and scours the surrounding activated carbon, pre-loosening and compacting the packing, facilitating large-scale agitation between the lifting shaft 901 and the tumbling component 902. At the same time, the airflow can blow away floating dust on the surface of the packing, further reducing the probability of diaphragm wear. In the non-extrusion contact stage, the tumbling component 902 can also locally intercept the downward airflow, prolonging the contact time between the exhaust gas and the activated carbon in the central area, enhancing the adsorption and capture effect of pollutants.

[0036] (2) Activated carbon desorption and regeneration: When the activated carbon packing is continuously saturated and the waste gas purification efficiency decreases, close the tangential waste gas pipe 2 and the outlet pipe 3 to cut off the waste gas inlet and outlet passage; through the regeneration pipe 4 at the top of the adsorption tank 1, introduce high-temperature steam or special washing agent and other regeneration media into the tank. The regeneration media penetrates the entire set of activated carbon adsorption packing layer 6 evenly from top to bottom, fully wets and contacts all activated carbon packing, and performs high-temperature desorption and solvent washing of VOCs organic matter, colloids and dust impurities adsorbed inside the activated carbon micropores.

[0037] During the regeneration process, the tangential air intake can maintain the low-speed rotation of the self-driven component 7, which drives the extrusion roller component 8 and the inward turning component 9 to continuously agitate the packing, keeping the saturated activated carbon in a loose and agitated state throughout the process. The regeneration medium can contact every part of the activated carbon without dead angles, solving the defects of uneven contact and incomplete desorption of traditional static regeneration media. The organic waste liquid and mixed waste gas generated by desorption are discharged from the tank through the discharge pipe 5 at the bottom center of the adsorption tank. After the regeneration is completed, the activated carbon packing restores its adsorption activity. The regeneration pipeline is closed and the waste gas inlet passage is restarted, and it can be put into VOCs waste gas adsorption and purification operation again.

Claims

1. A wastewater treatment VOCs gas treatment system, comprising a vertical cylindrical adsorption tank (1), wherein the adsorption tank (1) serves as the supporting substrate of the entire system, characterized in that, A tangential exhaust pipe (2) is provided at the upper horizontal tangential position of the side wall of the adsorption tank (1). The tangential exhaust pipe (2) is used to introduce VOCs exhaust gas into the tank along the tangential direction of the adsorption tank (1). An exhaust pipe (3) is provided extending laterally from the bottom of the adsorption tank (1) to discharge the tail gas that meets the standards after being purified by activated carbon adsorption. A self-driving assembly (7) is coaxially provided in the inner cavity of the adsorption tank (1). The self-driving assembly (7) relies on the vortex formed by the tangential air intake to provide rotational power. An extrusion roller assembly (8) is fixedly mounted on the self-driving assembly (7). An activated carbon adsorption packing layer (6) is coaxially sleeved on the upper side of the extrusion roller assembly (8). The entire assembly is coaxially arranged around the outside of the self-driving component (7). The extrusion roller assembly (8) rotates synchronously with the self-driving component (7). During the rotation, it periodically presses the packing layer (6) upward to loosen the packing in the packing layer (6). After the waste gas is dispersed by swirling, it passes evenly through the activated carbon adsorption packing layer (6) to complete the adsorption and purification of pollutants. The top center of the adsorption tank (1) is provided with a regeneration pipe (4) for introducing high-temperature steam or desiccant. The bottom center of the adsorption tank (1) is also provided with a discharge pipe (5) for discharging the desorbed waste liquid and waste gas. Valves are provided on the tangential waste gas pipe (2), the outlet pipe (3), the regeneration pipe (4), and the discharge pipe (5).

2. The wastewater treatment VOCs gas treatment system according to claim 1, characterized in that, The self-driving assembly (7) includes an annular fixing frame (701) fixedly installed on the bottom side wall of the adsorption tank (1). A bearing (702) is fixedly installed at the center of the annular fixing frame (701). A rotating shaft (703) is installed on the inner ring of the bearing (702). The upper end of the rotating shaft (703) extends to a position close to the top of the adsorption tank (1). A driving blade (704) is fixedly installed at the top of the rotating shaft (703). The driving blade (704) is directly opposite the air outlet of the tangential exhaust pipe (2).

3. The wastewater treatment VOCs gas treatment system according to claim 2, characterized in that, The activated carbon adsorption packing layer (6) includes a sleeve container (601) fixedly attached to the inner wall of the adsorption tank (1). The sleeve container (601) is evenly divided into four independent activated carbon packing cavities (602). Each activated carbon packing cavity (602) is filled with adsorbed activated carbon. The upper surface of the sleeve container (601) is covered with an annular mesh disk (604). The annular mesh disk (604) adopts a hollow mesh disk structure. The bottom of the sleeve container (601) is sealed with a porous elastic membrane (603). The surface of the porous elastic membrane (603) is densely covered with breathable micropores.

4. The wastewater treatment VOCs gas treatment system according to claim 3, characterized in that, The extrusion roller assembly (8) includes four spindles (801) fixedly connected to the lower end of the rotating shaft (703). The four spindles (801) are symmetrically distributed around the rotating shaft (703) in pairs. Each spindle (801) has a freely rotating extrusion roller (802) sleeved on its outer end. The rotational trajectory of all extrusion rollers (802) is directly opposite to the lower surface of the porous elastic diaphragm (603). When the rotating shaft (703) rotates continuously in a circular motion with the drive blade (704), the multiple sets of extrusion rollers (802) will periodically strike and press the porous elastic diaphragm (603) upward in sequence, causing the porous elastic diaphragm (603) to intermittently bulge upward and deform.

5. A wastewater treatment VOCs gas treatment system according to claim 4, characterized in that, Each activated carbon packing cavity (602) is equipped with an inward turning component (9). The inward turning component (9) includes a lifting shaft (901) vertically arranged at the center of the activated carbon packing cavity (602). The lifting shaft (901) is a hollow rod structure with a hollow interior. The upper end of the lifting shaft (901) extends to the annular mesh disk (604), and the lower end extends downward to the position of the porous elastic diaphragm (603). Multiple sets of horizontally arranged stirring components (902) are arranged at intervals along the vertical direction on the lifting shaft (901). The outer ring of each set of stirring components (902) is fixedly connected to the inner wall of the activated carbon packing cavity (602) by multiple limiting pull ropes (903).

6. A wastewater treatment VOCs gas treatment system according to claim 5, characterized in that, The stirring assembly (902) includes an arc-shaped stirring elastic membrane (9021), with multiple reinforcing ribs (9022) evenly arranged radially on the stirring elastic membrane (9021), and protruding particles (9023) densely arranged on the stirring elastic membrane (9021).

7. A wastewater treatment VOCs gas treatment system according to claim 5, characterized in that, A pre-loosening assembly (10) is fixedly installed at the center of the bottom surface of the porous elastic diaphragm (603). The pre-loosening assembly (10) includes an air storage plate (1001), a sealing piston (1002), a hemispherical extrusion head (1003), a return spring (1004), and a gas flow channel (1005). The top surface of the air storage plate (1001) is completely sealed and fixed to the center of the lower surface of the porous elastic diaphragm (603). A vertically penetrating gas flow channel (1005) is opened in the center of the air storage plate (1001). The lifting shaft (901) is hollow. The top of the cavity is sealed and connected to the gas flow channel (1005), and the internal gas passages of the two are connected; multiple micro air holes are evenly opened along the circumference of the lifting shaft (901) rod, and the micro air holes are connected to the hollow cavity inside the lifting shaft (901). The bottom of the pre-loosening assembly (10) is equipped with a hemispherical extrusion head (1003), and a sealing piston (1002) that cooperates with the gas storage plate (1001) is installed on the top of the hemispherical extrusion head (1003). A return spring (1004) is installed between the sealing piston (1002) and the gas storage plate (1001).

8. A method for treating VOCs gas using the treatment system of claim 7, characterized in that, The specific steps are as follows: S1. Swirl-flow air intake adsorption: Wastewater VOCs waste gas is sent into the adsorption tank (1) tangentially through the tangential waste gas pipe (2) to form a swirling flow. The airflow impacts the driving blades (704) and drives the self-driving assembly (7) and the extrusion roller assembly (8) to rotate. The waste gas enters the activated carbon packing cavity (602) evenly through the annular mesh disk (604) for adsorption and purification. The clean gas passes through the porous elastic membrane (603) and is discharged from the outlet pipe (3). S2, Turning the packing: The extrusion roller (802) periodically presses against the porous elastic diaphragm (603), driving the lifting shaft (901) to drive the turning assembly (902) to turn the activated carbon; the extrusion roller (802) impacts the hemispherical extrusion head (1003) to compress the gas in the gas storage plate (1001), and the high-pressure gas is sprayed out from the micro air holes of the lifting shaft (901) to flush the packing and prevent the activated carbon from caking and clogging; S3. After saturation, close the gas path: When the activated carbon adsorption is saturated, close the tangential waste gas pipe (2) and the gas outlet pipe (3) to cut off the waste gas flow; S4. Regeneration and restoration: High-temperature steam or eluent is introduced through the regeneration pipe (4), and the intake maintains the low-speed rotation of the self-driven component (7) to disturb the packing. The regeneration medium fully washes away the activated carbon. The desorption waste liquid and waste gas are discharged through the discharge pipe (5). After regeneration is completed, the intake is restarted to restore the adsorption operation.

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