An apparatus and method for realizing sludge air flotation concentration and sludge modification by using ozone

Abstract

The present invention provides a device and method for realizing sludge air flotation concentration and sludge modification by using ozone, which relates to the technical field of sewage treatment equipment. The device and method for realizing sludge air flotation concentration and sludge modification by using ozone include a fixed platform, a sewage supply mechanism, a separation and demulsification mechanism, and a recovery and circulation mechanism. The left side of the top of the fixed platform is fixedly connected with the sewage supply mechanism. The output end of the sewage supply mechanism is provided with the separation and demulsification mechanism, and the output end of the separation and demulsification mechanism is provided with the recovery and circulation mechanism. By installing the reflux U-shaped plate obliquely at an installation angle between 60 degrees, the separation time is shortened, the separation effect is improved, and the collection is carried out. Finally, it is discharged from the output end at the bottom of the gas collection hood and enters the ozone destructor. After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged from the sludge discharge pipe installed on the side wall of the separation and demulsification tank, thereby improving the separation and sludge discharge effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and particularly to a device and method for realizing sludge air flotation concentration and sludge modification by using ozone. Background Art

[0002] Sludge concentration is a very important link in the sludge treatment process. It can reduce the moisture content of sludge from 99% to 95% - 97%, and the volume is reduced to 20% - 30% of the original. It is a very important process for sludge reduction and also a very important link for creating conditions for subsequent sludge treatment. Sludge concentration is usually divided into gravity concentration and mechanical concentration. Gravity concentration refers to a process of completing concentration relying on the gravity of sludge particles themselves; mechanical concentration refers to a process of separating sludge particles from water in sludge through mechanical physical interception and extrusion, so as to achieve the concentration process, mainly including belt concentration and spiral concentrator; in addition, it also includes air flotation concentration. Air flotation concentration refers to a process of injecting tiny bubbles into sludge, adsorbing sludge particles by using the charge characteristics of the bubble surface, and under the driving action of the bubbles, carrying the sludge particles to the surface of the container, and collecting and scraping the sludge through the slag scraping equipment arranged on the surface, so as to complete the process of sludge concentration and dehydration.

[0003] After the sludge is concentrated, for further deep dehydration, the sludge needs to be modified to improve its dehydration performance. Usually, a certain amount of oxidizing agent is added to the sludge to oxidize part of the organic matter in the sludge, thereby destroying the sludge structure, making the water inside the sludge floc and the water inside the cells flow out to form free water, and improving its dehydration performance. Commonly used agents include ferric trichloride, hydrogen peroxide, etc. Ozone, as a strong oxidizing substance, can also be used to modify the sludge. At the same time, ozone, as a gas, can be used as the gas source for air flotation, which creates conditions for the coordinated treatment of the two treatment processes. The uneven contact and fusion of ozone will cause insufficient oxidation of the sludge, directly reducing the separation effect, including increasing the difficulty of subsequent sludge extraction. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a device and method for realizing sludge air flotation concentration and sludge modification by using ozone, which solves the problems that the uneven contact and fusion of ozone in the existing sludge concentration treatment technology will cause insufficient oxidation of the sludge, directly reducing the separation effect, including increasing the difficulty of subsequent sludge extraction.

[0005] To achieve the above object, the present invention is realized by the following technical solutions: A device for sludge air flotation concentration and sludge modification using ozone, comprising a fixed platform, a sewage supply mechanism, a separation and demulsification mechanism, and a recovery and circulation mechanism. The left side of the top of the fixed platform is fixedly connected to the sewage supply mechanism. The output end of the sewage supply mechanism is provided with a separation and demulsification mechanism. The output end of the separation and demulsification mechanism is provided with a recovery and circulation mechanism. The output end of the recovery and circulation mechanism is connected to the output end of the sewage supply mechanism;

[0006] The separation and demulsification mechanism includes a separation and demulsification tank, a partition wall, a reaction chamber, a demulsification chamber, a baffle plate, a reflux U-shaped plate, a circulating slag pushing component, a guide plate, a stirring mechanism, a gas collecting hood, an ozone destructor, and a sludge discharge pipe. The middle part of the inner side wall of the separation and demulsification tank is fixedly connected to the partition wall. The reaction chamber is arranged on the left side of the partition wall. The demulsification chamber is arranged on the right side of the partition wall. A plurality of groups of horizontally uniformly arranged baffle plates are fixedly connected to the middle and lower parts of the inner side wall of the reaction chamber. A plurality of groups of horizontally uniformly arranged and inclined 60-degree reflux U-shaped plates are fixedly connected to the middle and upper parts of the inner side wall of the reaction chamber. The circulating slag pushing component is fixedly connected to the upper part of the inner side wall of the reaction chamber. The guide plate is fixedly connected to the upper left part of the inner side wall of the demulsification chamber. The gas collecting hood is fixedly connected to the top of the separation and demulsification tank. The ozone destructor is fixedly connected to the top of the gas collecting hood. The input end of the ozone destructor is fixedly connected to the output end of the gas collecting hood. The stirring mechanism is fixedly connected to the top of the inner side wall of the demulsification chamber.

[0007] Preferably, the sewage supply mechanism includes a sludge tank, a sludge lift pump, a supply pipe, a water distribution pipe, water distribution holes, an ozone generator, an oxygen supply component, a gas dissolving component, a dissolving pipe, and a check valve. The sludge tank is fixedly connected to the top of the fixed platform. The sludge lift pump is fixedly connected to the inner side wall of the sludge tank. The output end of the sludge lift pump is fixedly connected to the supply pipe. The input end of the supply pipe extends and is connected to the outlet end of the sludge lift pump. The right output end of the supply pipe extends to the bottom of the reaction chamber. The output end of the supply pipe is fixedly connected to the water distribution pipe. A plurality of groups of uniformly horizontally arranged water distribution holes are arranged on the side wall of the water distribution pipe. The ozone generator is fixedly connected to the middle left side of the top of the fixed platform. The right end of the ozone generator is fixedly connected to the left input end of the gas dissolving component. The right output end of the gas dissolving component is fixedly connected to the dissolving pipe.

[0008] Preferably, the recovery and circulation mechanism includes a circulation water tank, a water outlet pipe, a guiding elbow pipe, a circulation elbow pipe, a circulation water pump, an output water collecting pipe, and a water outlet hole. The circulation water tank is fixedly connected to the top of the ozone generator. The input end of the top of the circulation water tank is fixedly connected to the guiding elbow pipe. The right input end of the guiding elbow pipe extends into the separation and demulsification tank. The right input end of the guiding elbow pipe is fixedly connected to the output water collecting pipe. The water outlet hole is arranged at the bottom of the reflux U-shaped plate.

[0009] Preferably, the oxygen supply component is fixedly connected to the left side of the top of the fixed platform. The right output end of the oxygen supply component is fixedly connected to the left input end of the ozone generator. The middle of the dissolution pipe is fixedly connected to the output end of the check valve. The right output end of the dissolution pipe is fixedly connected to the left input end of the supply pipe.

[0010] Preferably, the water distribution pipe is arranged inside the reaction chamber and below multiple baffle plates.

[0011] Preferably, the right part of the circulating slag pushing component extends into the demulsification chamber. The upper middle part of the right side wall of the separation and demulsification box is fixedly connected to the sludge discharge pipe.

[0012] Preferably, the left output end of the circulating water tank is fixedly connected to the water outlet pipe. The right input end of the guiding elbow penetrates through the side wall of the separation and demulsification box and extends to the bottom of the reaction chamber. The output collecting water pipe is arranged at the upper part of the reaction chamber.

[0013] Preferably, a method for realizing sludge air flotation concentration and sludge modification by using ozone includes the following steps:

[0014] S1. Before the sludge is separated from the mud and water in the sewage biochemical treatment system, it first enters the sludge tank, and then is lifted by the sludge lift pump and conveyed through the supply pipe to the separation and demulsification mechanism. Before entering the separation and demulsification mechanism, the oxygen supply component generates oxygen and enters the ozone generator. After the ozone generator forms ozone bubbles, they pass through the dissolved air component and the dissolution pipe and enter the supply pipe to be mixed with the sewage. The gas-liquid mixture carrying ozone gas is mixed again, and then the mixture is evenly distributed at the bottom of the reaction chamber separated by the partition wall through the water distribution pipe of the device and the water distribution holes installed on the water distribution pipe.

[0015] S2. The sludge in the mixed liquid begins to slowly rise in the reaction tank driven by the bubbles. To extend the reaction time between ozone in the bubbles and the sludge, a partition wall is installed inside the separation and demulsification tank to divide it into a reaction tank and a demulsification tank. Here, ozone oxidizes some organic matter in the sludge, thereby destroying the structure of the sludge zoogloea and some cell structures, turning some of the bound water in the sludge into free water, and thus improving the dewatering performance of the sludge. To improve the reaction efficiency in the reaction zone and increase the contact opportunity between ozone gas and the sludge, multiple sets of baffle plates are set in the reaction tank to improve the mixing degree, increase the contact opportunity, and extend the rising path. After the mixed liquid passes through the reaction tank, most of the ozone reacts with the sludge. The gas-liquid-sludge-water mixture after the reaction continues to move upward. To improve the sludge-water separation effect during the upward movement, referring to the shallow sedimentation theory, a reflux U-shaped plate is set in the air flotation reaction tank. The reflux U-shaped plate is inclined at an installation angle of 60 degrees to shorten the separation time and improve the separation effect. The separated sludge continues to move upward driven by the bubbles until the upper part of the reaction tank. Through the circulating slag scraping assembly set on the surface, the sludge floating to the surface is scraped out of the reaction tank and enters the bottom of the demulsification tank under the action of the guide plate;

[0016] S3. The separated clear water moves downward along the reflux U-shaped plate and is discharged through the water outlet holes installed at the bottom of each reflux U-shaped plate. The treated water after sludge-water separation enters the recycling mechanism composed of the water outlet holes set in the output collecting pipe and the guiding elbow pipe, then enters the circulation water tank, and finally is discharged from the system through the water outlet pipe installed on the upper part of the side wall of the circulation water tank. The water outlet pipe is installed on the upper part of the side wall of the circulation water tank to ensure that there is always a certain amount of water in the water outlet pipe to meet the system's recycling use. The water stored inside the circulation water tank can be driven by a circulation water pump to make the water enter the inside of the dissolved air assembly along the circulation elbow pipe for pre-mixing with the ozone bubbles, accelerating the mixing speed with the later sewage;

[0017] S4. The sludge scraped from the surface of the sludge-water reaction tank contains a large number of bubbles, making it difficult for the sludge to settle. Therefore, after entering the demulsification tank area, under the stirring action of multiple sets of stirring mechanisms installed inside the demulsification tank, the bubbles are separated from the sludge particles. The bubbles overflow from the water body and are collected together with the bubbles overflowing from the reaction tank through the gas collecting hood at the upper part of the equipment, and finally are discharged from the output end at the bottom of the gas collecting hood and enter the ozone destructor. After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged from the sludge outlet pipe installed on the side wall of the separation and demulsification tank.

[0018] The present invention provides a device and method for realizing sludge air flotation concentration and sludge modification by using ozone. It has the following beneficial effects:

[0019] 1. Before entering the separation and demulsification mechanism, the oxygen supply component generates oxygen and enters the ozone generator. After the ozone generator forms ozone bubbles, the bubbles pass through the dissolved air component and the dissolved air pipe and enter the supply pipe to be mixed with the sewage. The gas-liquid mixture carrying ozone gas is mixed again and then evenly distributed at the bottom of the reaction chamber formed by the partition wall through the distribution pipe of the device and the distribution holes installed on the distribution pipe, increasing the contact opportunity between ozone gas and sludge. A plurality of baffle plates are arranged in the reaction chamber to improve the mixing degree, increase the contact opportunity, and extend the rising path. After the mixture passes through the reaction chamber, most of the ozone reacts with the sludge. The reacted gas-liquid-sludge mixture continues to move upward. To improve the sludge-water separation effect during the upward movement, referring to the shallow sedimentation theory, a reflux U-shaped plate is arranged in the air flotation reaction chamber. The reflux U-shaped plate is inclined and installed at an angle between 60 degrees to shorten the separation time and improve the separation effect.

[0020] 2. After the sludge residue generated by the present invention enters the demulsification chamber area, under the stirring action of a plurality of stirring mechanisms installed inside the demulsification chamber, the bubbles are separated from the sludge particles. The bubbles overflow from the water body and, together with the bubbles overflowing from the reaction chamber, pass through the gas collection hood at the upper part of the equipment for collection, and finally are discharged through the output end at the bottom of the gas collection hood and enter the ozone destructor. After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged through the sludge outlet pipe installed on the side wall of the separation and demulsification tank, thereby improving the separation and sludge discharge effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an isometric schematic diagram of the present invention;

[0022] Figure 2 is a front and rear dimetric isometric schematic diagram of the present invention;

[0023] Figure 3 is an isometric view of the internal structure of the separation and demulsification mechanism of the present invention;

[0024] Figure 4 is a sectional three-dimensional schematic diagram of the internal structure of the present invention.

[0025] Among them, 1 is a fixed table; 2 is a sewage supply mechanism; 3 is a separation and demulsification mechanism; 4 is a recovery and circulation mechanism; 201 is a sludge tank; 202 is a sludge lift pump; 203 is a supply pipe; 204 is a water distribution pipe; 205 is a water distribution hole; 206 is an ozone generator; 207 is an oxygen supply component; 208 is a dissolved air component; 209 is a dissolved air pipe; 210 is a check valve; 301 is a separation and demulsification box; 302 is a partition wall; 303 is a reaction chamber; 304 is a demulsification chamber; 305 is a baffle plate; 306 is a reflux U-shaped plate; 307 is a circulating slag pushing component; 308 is a guide plate; 309 is a stirring mechanism; 310 is a gas collecting hood; 311 is an ozone destroyer; 312 is a sludge discharge pipe; 401 is a circulating water tank; 402 is a water outlet pipe; 403 is a guiding elbow pipe; 404 is a circulating elbow pipe; 405 is a circulating water pump; 406 is an output water collecting pipe; 407 is a water outlet hole. Specific implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment:

[0028] As Figures 1-4 shown, the embodiment of the present invention provides a device for realizing sludge air flotation concentration and sludge modification by using ozone, including a fixed table 1, a sewage supply mechanism 2, a separation and demulsification mechanism 3 and a recovery and circulation mechanism 4. The sewage supply mechanism 2 is fixedly connected to the left side of the top of the fixed table 1. The output end of the sewage supply mechanism 2 is provided with a separation and demulsification mechanism 3. The output end of the separation and demulsification mechanism 3 is provided with a recovery and circulation mechanism 4. The output end of the recovery and circulation mechanism 4 is connected to the output end of the sewage supply mechanism 2;

[0029] The separation and demulsification mechanism 3 includes a separation and demulsification tank 301, a partition wall 302, a reaction chamber 303, a demulsification chamber 304, a baffle plate 305, a reflux U-shaped plate 306, a circulating slag pushing assembly 307, a guide plate 308, a stirring mechanism 309, a gas collection hood 310, an ozone destroyer 311 and a sludge discharge pipe 312. In the middle of the inner side wall of the separation and demulsification tank 301, the partition wall 302 is fixedly connected. On the left side of the partition wall 302, there is a reaction chamber 303. On the right side of the partition wall 302, there is a demulsification chamber 304. In the middle and lower part of the inner side wall of the reaction chamber 303, multiple groups of baffle plates 305 are fixedly connected and arranged horizontally and evenly. In the middle and upper part of the inner side wall of the reaction chamber 303, multiple groups of reflux U-shaped plates 306 are fixedly connected and arranged horizontally and evenly and inclined at 60 degrees. At the upper part of the inner side wall of the reaction chamber 303, the circulating slag pushing assembly 307 is fixedly connected. At the upper left part of the inner side wall of the demulsification chamber 304, the guide plate 308 is fixedly connected. At the top of the separation and demulsification tank 301, the gas collection hood 310 is fixedly connected. At the top of the gas collection hood 310, the ozone destroyer 311 is fixedly connected. The input end of the ozone destroyer 311 is fixedly connected to the output end of the gas collection hood 310. The right part of the circulating slag pushing assembly 307 extends into the demulsification chamber 304. At the middle and upper part of the right side wall of the separation and demulsification tank 301, the sludge discharge pipe 312 is fixedly connected. At the top of the inner side wall of the demulsification chamber 304, the stirring mechanism 309 is fixedly connected. The right part of the circulating slag pushing assembly 307 extends into the demulsification chamber 304. At the middle and upper part of the right side wall of the separation and demulsification tank 301, the sludge discharge pipe 312 is fixedly connected. The sludge in the mixed liquid starts to slowly rise in the reaction chamber 303 driven by the bubbles. In order to extend the reaction time between the ozone in the bubbles and the sludge, the separation and demulsification tank 301 is divided into a reaction chamber 303 and a demulsification chamber 304 by the additionally installed partition wall 302 inside the separation and demulsification tank 301. Here, the ozone oxidizes part of the organic matter in the sludge, thus destroying the structure of the sludge zoogloea and part of the cell structure, turning part of the bound water in the sludge into free water, thereby improving the dewatering performance of the sludge. In order to improve the reaction efficiency of the reaction zone and increase the contact opportunity between the ozone gas and the sludge, multiple groups of baffle plates 305 are arranged in the reaction chamber 303, thereby improving the mixing degree, increasing the contact opportunity and extending the rising path. After the mixed liquid passes through the reaction chamber 303, most of the ozone reacts with the sludge. The reacted gas-liquid-sludge-water mixture continues to move upward. In order to improve the sludge-water separation effect during the upward movement, referring to the shallow sedimentation theory, the reflux U-shaped plates 306 are arranged in the air flotation reaction chamber 303. The reflux U-shaped plates 306 are installed obliquely, and the installation angle is between 60 degrees, so as to shorten the separation time and improve the separation effect. The separated sludge continues to move upward driven by the bubbles until the upper part of the reaction chamber 303. Through the circulating slag pushing assembly 307 arranged on the surface, the sludge floating to the surface is scraped out of the reaction chamber 303 and enters the bottom of the demulsification chamber 304 under the action of the guide plate 308. The sludge scraped out from the surface of the sludge-water reaction chamber 303 contains a large amount of bubbles, resulting in difficult sedimentation of the sludge. It is necessary to separate the bubbles from the sludge particles. Therefore, after entering the demulsification chamber 304 area,Under the agitation of multiple groups of agitation mechanisms 309 installed inside the demulsification tank 304, the bubbles are separated from the sludge particles. The bubbles overflow from the water body and, together with the bubbles overflowing from the reaction tank 303, pass through the gas collection hood 310 at the upper part of the equipment for collection, and finally are discharged through the output end at the bottom of the gas collection hood 310 and enter the ozone destructor 311. After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged through the sludge discharge pipe 312 installed on the side wall of the separation and demulsification tank 301.,

[0030] The sewage supply mechanism 2 includes a sludge tank 201, a sludge lift pump 202, a supply pipe 203, a water distribution pipe 204, water distribution holes 205, an ozone generator 206, an oxygen supply component 207, a gas dissolution component 208, a dissolution pipe 209 and a check valve 210. The sludge tank 201 is fixedly connected to the top of the fixed platform 1. The sludge lift pump 202 is fixedly connected to the inner side wall of the sludge tank 201. The output end of the sludge lift pump 202 is fixedly connected to the supply pipe 203. The input end of the supply pipe 203 extends and is connected to the outlet end of the sludge lift pump 202. The right output end of the supply pipe 203 extends to the bottom of the reaction tank 303. The output end of the supply pipe 203 is fixedly connected to the water distribution pipe 204. Multiple groups of evenly horizontally arranged water distribution holes 205 are provided on the side wall of the water distribution pipe 204. The ozone generator 206 is fixedly connected to the upper left side of the top of the fixed platform 1. The right end of the ozone generator 206 is fixedly connected to the left input end of the gas dissolution component 208. The right output end of the gas dissolution component 208 is fixedly connected to the dissolution pipe 209. The oxygen supply component 207 is fixedly connected to the upper left side of the top of the fixed platform 1. The right output end of the oxygen supply component 207 is fixedly connected to the left input end of the ozone generator 206. The middle of the dissolution pipe 209 is fixedly connected to the output end of the check valve 210. The right output end of the dissolution pipe 209 is fixedly connected to the left input end of the supply pipe 203. The water distribution pipe 204 is arranged inside the reaction tank 303 and is located below multiple groups of baffle plates 305. Before the sludge is separated from the mud and water in the sewage biochemical treatment system, it first enters the sludge tank 201, and then is lifted by the sludge lift pump 202 and transported through the supply pipe 203 to the separation and demulsification mechanism 3. Before entering the separation and demulsification mechanism 3, the oxygen supply component 207 generates oxygen and enters the ozone generator 206. After the ozone generator 206 forms ozone bubbles, they pass through the gas dissolution component 208 and the dissolution pipe 209 and enter the supply pipe 203 to be mixed with the sewage. The gas-water mixture carrying ozone gas is mixed again and then evenly distributed at the bottom of the reaction tank 303 separated by the partition wall 302 through the configured water distribution pipe 204 and the water distribution holes 205 installed on the water distribution pipe 204.,

[0031] The recycling mechanism 4 includes a circulation water tank 401, a water outlet pipe 402, a guiding elbow pipe 403, a circulation elbow pipe 404, a circulation water pump 405, an output collecting water pipe 406 and a water outlet hole 407. The circulation water tank 401 is fixedly connected to the top of the ozone generator 206. The input end at the top of the circulation water tank 401 is fixedly connected to the guiding elbow pipe 403. The right input end of the guiding elbow pipe 403 extends into the separation and demulsification tank 301. The right input end of the guiding elbow pipe 403 is fixedly connected to the output collecting water pipe 406. The water outlet hole 407 is arranged at the bottom of the reflux U-shaped plate 306. The left output end of the circulation water tank 401 is fixedly connected to the water outlet pipe 402. The right input end of the guiding elbow pipe 403 penetrates through the side wall of the separation and demulsification tank 301 and extends to the bottom of the reaction chamber 303. The output collecting water pipe 406 is arranged in the upper part of the reaction chamber 303. The separated clear water moves downward along the baffle plate 305 and enters the circulation water tank 401 through the recycling mechanism 4 composed of the water outlet hole 407 arranged on the output collecting water pipe 406 and the guiding elbow pipe 403. Finally, it is discharged from the system through the water outlet pipe 402 installed on the upper part of the side wall of the circulation water tank 401. The water outlet pipe 402 is arranged on the upper part of the side wall of the circulation water tank 401 to ensure that there is always a certain amount of water in the water outlet pipe 402 to meet the system's recycling use. The water stored in the circulation water tank 401 can be driven by the circulation water pump 405, so that the water enters the dissolved air assembly 208 along the circulation elbow pipe 404 and is premixed with the ozone bubbles to accelerate the mixing speed with the later sewage.

[0032] As Figures 1-4 shown, an embodiment of the present invention provides a method for realizing sludge air flotation concentration and sludge modification by using ozone, including the following steps:

[0033] S1. Before the sludge is separated from the sewage in the sewage biochemical treatment system, it first enters the sludge tank 201, and then is lifted by the sludge lift pump 202 and conveyed to the separation and demulsification mechanism 3 through the supply pipe 203. Before entering the separation and demulsification mechanism 3, the oxygen supply assembly 207 generates oxygen and enters the ozone generator 206. After the ozone generator 206 forms ozone bubbles, they enter the supply pipe 203 through the dissolved air assembly 208 and the dissolved pipe 209 and are mixed with the sewage. The gas-liquid mixture carrying ozone gas is mixed again and the mixture is evenly distributed at the bottom of the reaction chamber 303 separated by the partition wall 302 through the configured water distribution pipe 204 and the water distribution holes 205 installed on the water distribution pipe 204;

[0034] S2. The sludge in the mixed liquid begins to slowly rise in the reaction chamber 303 driven by the bubbles. To extend the reaction time between the ozone in the bubbles and the sludge, a partition wall 302 installed inside the separation and demulsification tank 301 divides the separation and demulsification tank 301 into a reaction chamber 303 and a demulsification chamber 304. Here, the ozone oxidizes some organic matter in the sludge, thus destroying the structure of the sludge zoogloea and some cell structures, turning some of the bound water in the sludge into free water, thereby improving the dewatering performance of the sludge. To improve the reaction efficiency in the reaction zone and increase the contact opportunity between the ozone gas and the sludge, multiple baffle plates 305 are arranged in the reaction chamber 303, so as to improve the mixing degree, increase the contact opportunity, and extend the rising path. After the mixed liquid passes through the reaction chamber 303, most of the ozone reacts with the sludge. The reacted gas-liquid-sludge mixture continues to move upward. To improve the sludge-water separation effect during the upward movement, referring to the shallow sedimentation theory, a reflux U-shaped plate 306 is arranged in the air flotation reaction chamber 303. The reflux U-shaped plate 306 is inclined and installed at an angle between 60 degrees to shorten the separation time and improve the separation effect. The separated sludge continues to move upward driven by the bubbles until the upper part of the reaction chamber 303. Through the circulating slag scraping assembly 307 arranged on the surface, the sludge floating to the surface is scraped out of the reaction chamber 303 and enters the bottom of the demulsification chamber 304 under the action of the guide plate 308;

[0035] S3. The separated clear water moves downward along the reflux U-shaped plate 306 and is discharged through the water outlet holes 407 installed at the bottom of each reflux U-shaped plate 306. The separated water passes through the recovery and circulation mechanism 4 composed of the water outlet holes 407 arranged on the output collecting pipe 406 and the guiding elbow pipe 403, enters the circulation water tank 401, and finally is discharged from the system through the water outlet pipe 402 installed on the upper part of the side wall of the circulation water tank 401. The water outlet pipe 402 is installed on the upper part of the side wall of the circulation water tank 401 to ensure that there is always a certain amount of water in the water outlet pipe 402 to meet the system's recycling needs. The water stored inside the circulation water tank 401 can be driven by the circulation water pump 405, so that the water enters the inside of the dissolved air assembly 208 along the circulation elbow pipe 404 and is premixed with the ozone bubbles to accelerate the mixing speed with the later sewage;

[0036] S4. The sludge scraped from the surface of the mud-water reaction tank 303 contains a large amount of air bubbles, which makes it difficult for the sludge to settle. Therefore, it is necessary to separate the air bubbles from the sludge particles. After entering the demulsification tank 304 area, under the agitation of multiple groups of agitation mechanisms 309 installed inside the demulsification tank 304, the air bubbles are separated from the sludge particles. The air bubbles overflow from the water body and, together with the air bubbles overflowing from the reaction tank 303, pass through the gas collection hood 310 at the upper part of the equipment for collection, and finally are discharged through the output end at the bottom of the gas collection hood 310 and enter the ozone destructor 311. After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged through the sludge discharge pipe 312 installed on the side wall of the separation and demulsification tank 301.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for realizing sludge air flotation concentration and sludge modification by using ozone, comprising a fixed platform (1), a sewage supply mechanism (2), a separation and demulsification mechanism (3) and a recovery and circulation mechanism (4). It is characterized in that: The sewage supply mechanism (2) is fixedly connected to the left side of the top of the fixed platform (1). The output end of the sewage supply mechanism (2) is provided with a separation and demulsification mechanism (3). The output end of the separation and demulsification mechanism (3) is provided with a recovery and circulation mechanism (4). The output end of the recovery and circulation mechanism (4) is connected to the output end of the sewage supply mechanism (2). The separation and demulsification mechanism (3) includes a separation and demulsification tank (301), a partition wall (302), a reaction chamber (303), a demulsification chamber (304), a baffle plate (305), a reflux U-shaped plate (306), a circulating slag pushing assembly (307), a guide plate (308), a stirring mechanism (309), a gas collection hood (310), an ozone destructor (311) and a sludge discharge pipe (312). The middle part of the inner side wall of the separation and demulsification tank (301) is fixedly connected with the partition wall (302). The reaction chamber (303) is arranged on the left side of the partition wall (302). The demulsification chamber (304) is arranged on the right side of the partition wall (302). A plurality of groups of horizontally and uniformly arranged baffle plates (305) are fixedly connected to the middle and lower parts of the inner side wall of the reaction chamber (303). A plurality of groups of horizontally and uniformly arranged and inclined 60-degree reflux U-shaped plates (306) are fixedly connected to the middle and upper parts of the inner side wall of the reaction chamber (303). The circulating slag pushing assembly (307) is fixedly connected to the upper part of the inner side wall of the reaction chamber (303). The guide plate (308) is fixedly connected to the upper left part of the inner side wall of the demulsification chamber (304). The gas collection hood (310) is fixedly connected to the top of the separation and demulsification tank (301). The ozone destructor (311) is fixedly connected to the top of the gas collection hood (310). The input end of the ozone destructor (311) is fixedly connected to the output end of the gas collection hood (310). The stirring mechanism (309) is fixedly connected to the top of the inner side wall of the demulsification chamber (304). The right part of the circulating slag pushing assembly (307) extends into the demulsification chamber (304). The sludge discharge pipe (312) is fixedly connected to the middle and upper part of the right side wall of the separation and demulsification tank (301). The recovery and circulation mechanism (4) includes a circulation water tank (401), a water outlet pipe (402), a guiding elbow pipe (403), a circulating elbow pipe (404), a circulating water pump (405), an output water collecting pipe (406) and a water outlet hole (407). The circulation water tank (401) is fixedly connected to the top of the ozone generator (206). The input end of the top of the circulation water tank (401) is fixedly connected to the guiding elbow pipe (403). The right input end of the guiding elbow pipe (403) extends into the separation and demulsification tank (301). The right input end of the guiding elbow pipe (403) is fixedly connected to the output water collecting pipe (406). The water outlet hole (407) is arranged at the bottom of the reflux U-shaped plate (306).

2. The device for realizing sludge air flotation concentration and sludge modification by using ozone according to claim 1, It is characterized in that: The sewage supply mechanism (2) includes a sludge tank (201), a sludge lift pump (202), a supply pipe (203), a water distribution pipe (204), water distribution holes (205), an ozone generator (206), an oxygen supply component (207), a dissolved air component (208), a dissolved air pipe (209) and a check valve (210). The sludge tank (201) is fixedly connected to the top of the fixed platform (1). The inner side wall of the sludge tank (201) is fixedly connected to the sludge lift pump (202). The output end of the sludge lift pump (202) is fixedly connected to the supply pipe (203). The input end of the supply pipe (203) extends and is connected to the outlet end of the sludge lift pump (202). The right output end of the supply pipe (203) extends to the bottom of the reaction chamber (303). The output end of the supply pipe (203) is fixedly connected to the water distribution pipe (204). Multiple groups of evenly horizontally arranged water distribution holes (205) are provided on the side wall of the water distribution pipe (204). The ozone generator (206) is fixedly connected to the upper left side of the top of the fixed platform (1). The right end of the ozone generator (206) is fixedly connected to the left input end of the dissolved air component (208). The right output end of the dissolved air component (208) is fixedly connected to the dissolved air pipe (209).

3. The device for realizing sludge air flotation concentration and sludge modification by using ozone according to claim 2, characterized in that: The oxygen supply component (207) is fixedly connected to the upper left side of the top of the fixed platform (1). The right output end of the oxygen supply component (207) is fixedly connected to the left input end of the ozone generator (206). The middle of the dissolved air pipe (209) is fixedly connected to the output end of the check valve (210). The right output end of the dissolved air pipe (209) is fixedly connected to the left input end of the supply pipe (203).

4. The device for realizing sludge air flotation concentration and sludge modification by using ozone according to claim 2, characterized in that: The water distribution pipe (204) is arranged inside the reaction chamber (303) and is located below multiple groups of baffle plates (305).

5. The device for realizing sludge air flotation concentration and sludge modification by using ozone according to claim 1, characterized in that: The left output end of the circulation water tank (401) is fixedly connected to the water outlet pipe (402). The right input end of the guiding elbow pipe (403) penetrates through the side wall of the separation and demulsification tank (301) and extends to the bottom of the reaction chamber (303). The output collecting water pipe (406) is arranged at the upper part of the reaction chamber (303).

6. A method for realizing sludge air flotation concentration and sludge modification by using ozone, characterized in that: using the device for realizing sludge air flotation concentration and sludge modification according to any one of claims 1-5, comprising the following steps: S1. Before the sludge is separated from the sewage in the sewage biochemical treatment system, it first enters the sludge tank (201), and then is lifted by the sludge lift pump (202) and transported through the supply pipe (203) to the separation and demulsification mechanism (3). Before entering the separation and demulsification mechanism (3), the oxygen supply component (207) generates oxygen and enters the ozone generator (206). After the ozone generator (206) forms ozone bubbles, they pass through the dissolved air component (208) and the dissolved air pipe (209) and enter the supply pipe (203) to be mixed with the sewage. The gas-liquid mixture carrying ozone gas is mixed again and then evenly distributed at the bottom of the reaction chamber (303) separated by the partition wall (302) through the configured water distribution pipe (204) and the water distribution holes (205) installed on the water distribution pipe (204). S2. The sludge in the mixture starts to slowly rise in the reaction chamber (303) driven by the bubbles. In order to extend the reaction time between the ozone in the bubbles and the sludge, the separation and demulsification tank (301) is divided into a reaction chamber (303) and a demulsification chamber (304) by the added partition wall (302) inside the separation and demulsification tank (301). Here, the ozone oxidizes some organic matter in the sludge, thus destroying the structure of the sludge zoogloea and some cell structures, turning some of the bound water in the sludge into free water, thereby improving the dewatering performance of the sludge. In order to improve the reaction efficiency in the reaction zone and increase the contact opportunity between the ozone gas and the sludge, multiple sets of baffle plates (305) are arranged in the reaction chamber (303), so as to improve the mixing degree, increase the contact opportunity, and extend the rising path. After the mixture passes through the reaction chamber (303), most of the ozone reacts with the sludge. The reacted gas-liquid-sludge mixture continues to move upward. In order to improve the sludge-water separation effect during the upward movement, referring to the shallow sedimentation theory, a reflux U-shaped plate (306) is arranged in the air flotation reaction chamber (303). The reflux U-shaped plate (306) is inclined at an installation angle of between 60 degrees to shorten the separation time and improve the separation effect. The separated sludge continues to move upward driven by the bubbles until the upper part of the reaction chamber (303). Through the circulating slag scraping component (307) arranged on the surface, the sludge floating to the surface is scraped out of the reaction chamber (303) and enters the bottom of the demulsification chamber (304) under the action of the guide plate (308). S3. The separated clear water moves downward along the reflux U-shaped plate (306), and the effluent after sedimentation separation is discharged through the water outlet holes (407) installed at the bottom of each reflux U-shaped plate (306). It enters the recycling water tank (401) through the recycling and circulation mechanism (4) composed of the water outlet holes (407) provided in the output collecting pipe (406) and the guiding elbow pipe (403), and finally is discharged from the system through the water outlet pipe (402) installed at the upper part of the side wall of the recycling water tank (401). The water outlet pipe (402) is installed at the upper part of the side wall of the recycling water tank (401) to ensure that there is always a certain amount of water in the water outlet pipe (402) to meet the recycling of the system. The water stored inside the recycling water tank (401) can be driven by the recycling water pump (405) to make the water enter the inside of the dissolved air assembly (208) along the recycling elbow pipe (404) for pre-mixing with the ozone bubbles, accelerating the mixing speed with the later sewage; S4. The mud residue scraped from the surface of the mud-water reaction chamber (303) contains a large number of bubbles, which makes it difficult for the sludge to settle. It is necessary to separate the bubbles from the sludge particles. Therefore, after entering the demulsification chamber (304) area, under the agitation of multiple groups of agitation mechanisms (309) installed inside the demulsification chamber (304), the bubbles are separated from the sludge particles. The bubbles overflow from the water body and are collected together with the bubbles overflowing from the reaction chamber (303) through the gas collecting hood (310) at the upper part of the equipment, and finally are discharged from the bottom output end of the gas collecting hood (310) and enter the ozone destructor (311). After the ozone molecules are destroyed, they are reduced to oxygen and discharged back into the atmosphere. The remaining concentrated sludge is discharged from the sludge outlet pipe (312) installed on the side wall of the separation and demulsification tank (301).

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