Synergistic ozone fluidized bed

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a synergistic ozone fluidized bed which comprises a gas-liquid mixing device, a sewage treatment device, an ozone decomposition device and a tail gas treatment device, the gas-liquid mixing device is communicated with a pressurized ozone pipeline and a sewage pipeline and is used for premixing pressurized ozone and sewage to be treated; the sewage treatment device comprises a mixing cylinder and a fluidization cylinder arranged in the mixing cylinder, the fluidization cylinder is communicated with the gas-liquid mixing device, a plurality of layers of gas distribution plates are arranged in the fluidization cylinder, and the gas distribution plates are used for cutting ozone bubbles and increasing the contact area of ozone and sewage; the ozone decomposition device is communicated with the sewage treatment device and is used for decomposing residual ozone; the tail gas treatment device is communicated with the tops of the sewage treatment device and the ozone decomposition device and is used for treating redundant tail gas inside the sewage treatment device and the ozone decomposition device; the lower end of the fluidization cylinder is connected with a gas guide pipe which is connected with an external gas source and used for conveying gas into the fluidization cylinder. The device has the effect of improving the ozone utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and in particular to an enhanced ozone fluidized bed. BACKGROUND

[0002] With the rapid development of China's economy, the generation of industrial wastewater also increases, and the problem of surface water pollution caused by the discharge of refractory organic wastewater in wastewater is becoming more and more serious. The biochemical method for refractory organic matter cannot meet the discharge standard of industrial wastewater, and the biodegradability is low. The advanced oxidation technology can degrade refractory organic matter and improve biodegradability, which is a better process for pretreatment and advanced treatment of refractory organic wastewater.

[0003] Simple ozone oxidation has selectivity, and the treatment effect on some unsaturated organic matter and aromatic compounds in sewage is good, but the treatment effect on some small molecule fatty acids and other organic matter is poor, and it is difficult to completely mineralize and decompose the organic matter. The ozone fluidized bed technology inherits the advantages of traditional ozone oxidation, fully utilizes the kinetic energy carried by ozone itself, improves the design of the internal structure of the ozone sewage two-phase contactor, prolongs the gas-water contact path by several times, maintains the uniformity of the ozone concentration inside the fluidized bed, ensures the overall reaction speed, and greatly improves the chemical reaction rate. At the same time, the micro-channel and inert filler are embedded and combined into the main device to strengthen the mass transfer effect, and the mass transfer capacity increases exponentially. The ozone fluidized bed utilizes the kinetic energy carried by ozone itself to circulate, thereby improving the contact time of ozone and sewage. The ozone generator has an oxygen source and an air source. The preparation concentration of the oxygen source is 70-180 g / m3, and the preparation concentration of the air source is 20-40 g / m3. However, the total gas amount of the oxygen source entering the bottom of the fluidized bed is less than that of the air source entering the bottom of the fluidized bed.

[0004] When using an oxygen source to prepare ozone, although the ozone concentration is high, when the amount of ozone added is small, the gas amount entering the inside of the fluidized bed is reduced, which may result in insufficient kinetic energy provided by the circulating gas source, and the circulating amount cannot meet the design requirements, which greatly reduces the utilization rate of ozone and ultimately leads to poor treatment effect of the ozone fluidized bed. CONTENT OF THE INVENTION

[0005] In order to improve the utilization rate of ozone, the present application provides an enhanced ozone fluidized bed.

[0006] The enhanced ozone fluidized bed provided by the present application adopts the following technical scheme:

[0007] An enhanced ozone fluidized bed, comprising a gas-liquid mixing device, a sewage treatment device connected with the gas-liquid mixing device, an ozone decomposition device connected to the sewage treatment device, and a tail gas treatment device connected to the ozone decomposition device.

[0008] The gas-liquid mixing device is connected to a pressurized ozone pipeline for conveying pressurized ozone and a sewage pipeline for conveying sewage to be treated, and is used to pre-mix the pressurized ozone and the sewage to be treated;

[0009] The sewage treatment device includes a mixing drum and a fluidizing drum arranged inside the mixing drum. The fluidizing drum is connected to the bottom of the gas-liquid mixing device and is used to fully react the pressurized ozone and the sewage. The fluidizing drum is provided with a multi-layer gas distribution plate inside, which is used to cut the ozone bubbles and increase the contact area between the ozone and the sewage.

[0010] The ozone decomposition device is connected to the top of the sewage treatment device and is used to decompose the ozone remaining after the sewage is treated;

[0011] The tail gas treatment device is connected to the top of the sewage treatment device and the ozone decomposition device, and is used to treat excess tail gas in the sewage treatment device and the ozone decomposition device;

[0012] The lower end of the fluidizing cylinder is connected to an air guide pipe, which is connected to an external gas source and is used to transport gas into the fluidizing cylinder.

[0013] By adopting the above technical solution, during the oxidation reaction of sewage and ozone, a large amount of gas can be transported to the inside of the fluidized drum through the air duct, thereby compensating for the problem of insufficient gas volume inside the fluidized drum during the preparation of ozone by the oxygen source. In addition, the external gas volume input by the air duct can increase the kinetic energy of the mixed liquid after the ozone and sewage are mixed, so that the gas-water mixture can circulate on the fluidized drum and be controlled to achieve a reasonable circulation multiple, thereby improving the utilization rate of ozone.

[0014] Optionally, an aeration plate is fixed to the end of the air guide tube close to the fluidizing cylinder, the aeration plate is connected to the air guide tube, and dense aeration holes are opened on the aeration plate.

[0015] By adopting the above technical solution, the gas transported into the fluidizing barrel from the external gas source can flow into the inside of the aeration plate and be discharged outward through the aeration holes, which can decompose the gas into countless small bubbles. Not only does it transport the required amount of gas into the fluidizing barrel, allowing the required number of internal circulations inside the fluidizing barrel, but the countless small bubbles can also stir the inside of the fluidizing barrel, thereby improving the mixing efficiency of the pressurized ozone and sewage.

[0016] Optionally, the diameter of the bottom of the fluidizing cylinder is larger than the diameter of the top of the cylinder, so that the mixed liquid of pressurized ozone and sewage forms a Venturi effect in the fluidizing cylinder.

[0017] By adopting the above technical solution, the mixture of pressurized ozone and sewage flows from the lower end of the fluidizing cylinder into the fluidizing cylinder. After flowing into the interior of the fluidizing cylinder from the inlet at the lower end of the fluidizing cylinder, a Venturi effect is formed at the bottom of the fluidizing cylinder, thereby increasing the mixing effect of ozone and sewage and providing power for the sewage and ozone entering the microchannel.

[0018] Optionally, the sewage treatment device further includes a guide plate arranged above the fluidizing cylinder, and the guide plate can change the flow direction of the sewage and pressurized ozone to form an internal circulation.

[0019] By adopting the above technical solution, when the gas-water mixture in the fluidized drum flows upward, the gas-water mixture will flow onto the guide plate, and the guide plate changes the flow direction of the gas-water mixture so that it can flow downward. Under the action of the guide plate and the influence of the negative pressure formed at the bottom of the fluidized drum, the gas-water mixture will form a clockwise internal circulation, thereby extending the flow path of the gas-water mixture and expanding the contact area of ​​the gas-water mixture, allowing ozone to contact the pollutants in the sewage more fully.

[0020] Optionally, a drainage device is provided on the fluidizing cylinder, and the drainage device includes a drainage pipe arranged along the length direction of the fluidizing cylinder, the drainage pipe is connected to the air guide pipe, the drainage pipe is arranged around the cylinder wall of the fluidizing cylinder, and a plurality of jet ports are evenly opened along the length direction of the drainage pipe, so that the mixed liquid of pressurized ozone and sewage can be internally circulated along the direction of the drainage pipe.

[0021] By adopting the above technical solution, after the ozone and sewage mixture flows into the fluidizing drum, the gas in the air guide pipe can be ejected from the jet port through the drainage pipe arranged around the fluidizing drum and the jet port opened on the drainage pipe, thereby controlling the ozone and sewage mixture to accelerate the flow and flow along the length direction of the drainage pipe, allowing the ozone and sewage mixture to circulate inside and outside the fluidizing drum, thereby improving the utilization rate of ozone and allowing the ozone to better avoid contact with the pollution in the sewage.

[0022] Optionally, an inclined air jet pipe is fixed at the air jet outlet of the drainage pipe, and the air jet pipe is inclined along the flow direction of the sewage.

[0023] By adopting the above technical solution, the inclined jet pipe can better control the mixed liquid of ozone and sewage to flow in a predetermined direction, allowing it to circulate around the inside and outside of the fluidizing cylinder.

[0024] Optionally, the drainage device is provided in multiple groups, and the multiple groups of drainage devices are evenly arranged along the circumference of the fluidizing cylinder, and the air guide pipe is connected to the multiple drainage pipes.

[0025] By adopting the above technical solution, the multiple sets of drainage devices can increase the flow rate of the ozone and sewage mixture, allowing the gas-water mixture to circulate better inside and outside the fluidizing cylinder.

[0026] Optionally, a stirring device is installed on the fluidizing drum, and the stirring device includes a stirring shaft rotatably arranged in the fluidizing drum, and multiple groups of stirring blades are fixed on the stirring shaft, each group of stirring blades is located between adjacent gas distribution plates, and the lower end of the stirring shaft is provided with a driving assembly for driving the stirring shaft to rotate.

[0027] By adopting the above technical solution, during the mixing reaction of ozone and sewage, the driving component controls the rotation of the stirring shaft and stirs the gas-water mixture through the stirring blades, allowing the sewage and ozone to repeatedly contact each other, enhancing the oxidation effect, and thus accelerating the reaction between ozone and sewage.

[0028] Optionally, the stirring shaft and the stirring blade are both hollow structures, and the stirring blade is connected to the stirring shaft, an air outlet is opened on the stirring blade, the air guide pipe is connected to the inside of the stirring shaft, and the air guide pipe and the stirring shaft are rotatably matched.

[0029] By adopting the above technical solution, during the oxidation reaction of ozone and sewage, external gas is directly transported between the two adjacent gas distribution plates, and the stirring blades receive external input gas during the process of stirring the gas-water mixture, providing sufficient kinetic energy for the gas-water mixing, which not only allows the ozone and sewage to oxidize better, but also allows the gas-water mixture to circulate internally inside the fluidized barrel.

[0030] Optionally, a circulation device is provided in the area between the fluidizing cylinder and the mixing cylinder, and the circulation device includes a spiral blade that is rotatably arranged inside the mixing cylinder, so that the mixed liquid at the top of the fluidizing cylinder flows downward under the rotation of the spiral blade. A reversing plate fixed on the mixing cylinder is provided at the lower end of the fluidizing cylinder, which is used to redirect the downward-flowing mixed liquid and drain it into the fluidizing cylinder.

[0031] By adopting the above technical solution, the spiral blades can stir the gas-water mixture above downward during the rotation process, so that the gas-water mixture flowing from the upper end of the fluidizing cylinder can flow downward under the action of the rotation of the spiral blades, and finally flow into the fluidizing cylinder again, thereby realizing active circulation.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The fluidized drum can make the sewage reach the standard circulation volume multiple times, allowing the sewage to repeatedly contact with ozone and enhance the oxidation effect;

[0034] 2. The air guide pipe installed on the fluidized drum can transport a large amount of gas into the fluidized drum, providing sufficient kinetic energy for the mixing of ozone and sewage, ensuring the circulation multiples of the gas-water mixture on the fluidized drum, and greatly improving the ozone utilization rate;

[0035] 3. The drainage pipe arranged around the fluidized drum can, when the kinetic energy of the ozone and sewage mixture in the fluidized drum is insufficient, allow the gas to promote the flow of the gas-water mixture during the process of transporting gas into the fluidized drum, so that it can achieve the required circulation multiples;

[0036] 4. The stirring device installed in the fluidized drum can stir the gas-water mixture in the fluidized drum, accelerating the reaction of ozone and sewage; the circulation device installed between the fluidized drum and the mixing drum can allow the gas-water mixture flowing out of the upper end of the fluidized drum to continue to flow downward under the action of the rotation of the spiral blades, so that it can be actively circulated, thereby improving the utilization rate of ozone. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of sewage treatment according to the first embodiment of the present application;

[0038] Figure 2 is a schematic diagram of an airway tube according to the first embodiment of the present application;

[0039] Figure 3 This is a schematic diagram of a drainage device according to the second embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of a circulation device according to the third embodiment of the present application;

[0041] Figure 5 This is a schematic diagram of a stirring device according to the third embodiment of the present application;

[0042] Explanation of the accompanying symbols: 1. Gas-liquid mixing device; 11. Pressurized ozone pipe; 12. Sewage pipe; 2. Sewage treatment device; 21. Mixing cylinder; 22. Fluidizing cylinder; 221. Gas distribution plate; 23. Guide plate; 24. Air guide pipe; 241. Aeration plate; 3. Ozone decomposition device; 4. Tail gas treatment device; 5. Drainage device; 51. Drainage pipe; 52. Jet pipe; 6. Stirring device; 61. Stirring shaft; 62. Stirring blade; 63. Drive assembly; 631. Mounting box; 632. Stirring motor; 64. Fixed ring; 7. Circulation device; 71. Rotating shaft; 72. Spiral blade; 73. Synchronous wheel; 74. Synchronous belt; 75. Circulation motor; 76. Reversing plate. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-5 This application is described in further detail.

[0044] The embodiments of the present application disclose a synergistic ozone fluidized bed.

[0045] Example 1

[0046] Reference Figure 1 and Figure 2 A synergistic ozone fluidized bed includes a gas-liquid mixing device 1, a sewage treatment device 2, an ozone decomposition device 3, and an exhaust gas treatment device 4. The gas-liquid mixing device 1 is connected to a pressurized ozone pipe 11 and a sewage pipe 12, and is used to pre-mix the pressurized ozone flowing from the pressurized ozone pipe 11 and the sewage flowing from the sewage pipe 12; the sewage treatment device 2 includes a mixing drum 21 and a fluidizing drum 22, the fluidizing drum 22 is arranged inside the mixing drum 21 and the axes of the two coincide, and the fluidizing drum 22 is connected to the bottom of the gas-liquid mixing device 1 for sufficient reaction between the pressurized ozone and the sewage; the ozone decomposition device 3 is connected to the top of the sewage treatment device 2 and is used to decompose the ozone remaining after the sewage is treated; the exhaust gas treatment device 4 is connected to the top of the sewage treatment device 2 and the ozone decomposition device 3, and is used to treat excess exhaust in the sewage treatment device 2 and the ozone decomposition device 3.

[0047] According to this technical solution, ozone is pressurized and transported to a gas-liquid mixing device 1 via a pressurized ozone pipe 11. Sewage is then transported to the gas-liquid mixing device 1 via a sewage pipe 12. The pressurized ozone and sewage are mixed before entering the sewage treatment device 2 to increase the ozone's solubility in the sewage. The ozone-sewage mixture enters the sewage treatment device 2 from the bottom and circulates multiple times, fully utilizing the ozone to treat the sewage. The treated sewage-ozone mixture then enters the ozone decomposition device 3 from the top. The ozone decomposition device 3 remains stationary for a period of time until it overflows after being filled with sewage, temporarily storing the sewage and fully decomposing the ozone within. Excess ozone and other gases in the sewage treatment device 2 and the ozone decomposition device 3 are then removed by an exhaust gas treatment device 4. Under certain temperature and pressure conditions, this wastewater treatment device using ozone can increase the gas-liquid contact area, reduce the self-decomposition rate of ozone in the liquid phase, and improve ozone mass transfer efficiency.

[0048] Reference Figure 1 and Figure 2 To ensure sufficient decomposition time for the remaining ozone in the sewage, ozone decomposition device 3 utilizes ozone's half-life of approximately 30 minutes and is designed to store at least 30 minutes of the sewage-ozone mixture. Because both untreated sewage and ozone continuously enter sewage treatment device 2 from the bottom, a relatively constant concentration gradient between the liquid and gas phases is maintained, providing a continuous driving force for ozone to enter the liquid phase from the gas phase.

[0049] The gas-liquid mixing device 1 comprises a tubular reactor, in which a plurality of porous structures are arranged in staggered manner to enhance the contact between ozone and sewage. A plurality of rows and columns of porous structures are arranged in the tubular reactor. In particular, the porous structures can be arranged in parallel or unevenly to increase the contact area between ozone and sewage and to divide the ozone into small bubbles, which are more easily dissolved in the sewage. The gas-liquid mixing device 1 further comprises an aeration disc arranged at the bottom of the fluidization cylinder 22 of the sewage treatment device 2, which is used to spray the mixed liquid of pressurized ozone and sewage into the fluidization cylinder 22 of the sewage treatment device 2 and to form a negative pressure at the bottom of the fluidization cylinder 22 of the sewage treatment device 2. The aeration disc can increase the flow rate of the mixed liquid of pressurized ozone and sewage and form a negative pressure at the spray port. The area to which the negative pressure radiates can form a suction force on the mixed liquid, thereby providing power for forming a circulation.

[0050] With reference to Figure 1 and Figure 2 The diameter of the bottom of the fluidization cylinder 22 is greater than the diameter of the top of the fluidization cylinder 22 to form a Venturi effect, which further accelerates the flow rate of the mixed liquid and enhances the mixing effect due to the formation of the Venturi effect by the fluidization cylinder 22. The fluidization cylinder 22 comprises a gas distribution plate 221, which is multilayered and arranged in the interior of the fluidization cylinder 22 in sequence to cut the ozone bubbles and increase the contact area between ozone and sewage, and the gas distribution plate 221 is uniformly provided with circular holes with a diameter ranging from 1.0 to 2.0 cm. The gas distribution plate 221 is arranged in the fluidization cylinder 22 in a staggered manner from top to bottom. The ozone bubbles are cut into small bubbles at intervals, thereby increasing the solubility of ozone in the sewage. The mixing effect is further increased after pre-mixing and under the action of the gas distribution plate 221. The circular holes are provided on the gas distribution plate 221, and the diameter of the circular holes is taken from 1.0 to 2.0 cm, which can well divide the bubbles into a dissolvable degree, and the effect is good.

[0051] The sewage treatment device 2 also includes a guide plate 23 arranged above the fluidizing cylinder 22 and fixed to the mixing cylinder 21, and an air guide pipe 24 arranged at the lower end of the fluidizing cylinder 22. The guide plate 23 is a downwardly concave cover structure, which can change the direction of the mixture of sewage and pressurized ozone shot thereon and return it to the bottom of the sewage treatment device 2, thereby forming an internal circulation flow under the action of the negative pressure at the aeration plate; the air guide pipe 24 horizontally passes through the mixing cylinder 21 and extends into the lower end inlet of the fluidizing cylinder 22, and the air guide pipe 24 is connected to an external air source away from the outer port of the fluidizing cylinder 22, and gas is transported to the inside of the fluidizing cylinder 22 through the set air source, thereby increasing the air volume inside the fluidizing cylinder 22, providing sufficient kinetic energy for gas-water mixing, ensuring the circulation multiples of the gas-water mixture, and greatly improving the ozone utilization rate. An aeration plate 241 with a hollow structure is fixed at the port of the air guide pipe 24 at the lower end of the fluidizing cylinder 22. The air guide pipe 24 is connected to the interior of the aeration plate 241, and a plurality of aeration holes are evenly opened on the surface of the aeration plate 241. After the external air source transports gas into the air guide pipe 24, the gas is discharged outward through the aeration holes on the aeration plate 241, allowing the gas to be decomposed into countless small bubbles. Not only does it transport the required amount of gas into the fluidizing cylinder 22, allowing the required number of internal circulations inside the fluidizing cylinder 22, but also countless small bubbles can stir the interior of the fluidizing cylinder 22, thereby improving the mixing efficiency of the pressurized ozone and sewage.

[0052] Reference Figure 1 and Figure 2 The sewage treatment device 2 also includes a first water outlet trough and a first vent valve. The first water outlet trough is provided at the upper portion of the guide device and is used to guide the sewage after ozone treatment to the ozone decomposition device 3. The first vent valve is provided at the bottom of the mixing drum 21 to discharge excess sewage from the sewage treatment device 2. A first water outlet trough is provided at the top of the sewage treatment device 2 to guide the mixed liquid of the sewage after the circulation reaction and the pressurized ozone to the ozone decomposition device 3. The sewage treatment device 2 also includes a first breathing valve, which is connected to the upper end of the mixing drum 21 to form a slight positive pressure inside the sewage treatment device 2. According to Henry's law, it can be seen that the solubility of ozone in water can be effectively increased, and the utilization rate of ozone can be effectively improved.

[0053] The sewage treatment device 2 adopts a bottom-in and top-out water inlet and outlet method. The sewage enters the sewage treatment device 2 from the bottom. The inner diameter of the fluidizing tube 22 is larger than the diameter of the top of the fluidizing tube 22, so a Venturi effect is formed, which enhances the mixing effect. Ozone also enters the sewage treatment device 2 from the bottom through the aeration plate. A negative pressure is formed at the aeration plate, and the sewage is sucked into the sewage treatment device 2. The ozone and sewage are quickly mixed. The gas-water mixture flows upward along the wall of the sewage treatment device 2. Under the action of the guide plate 23, the flow trajectory of the gas-water mixture is changed. Under the influence of negative pressure, the gas-water mixture forms a clockwise internal circulation. Through the design of the gas volume and the sewage treatment device 2, the gas-water mixture can reach a circulation volume of about dozens of times the water inlet volume, greatly extending the water flow path and expanding the gas-liquid contact area. The gas-liquid film layer is continuously updated, the bubble stroke is increased, and the ozone transfer efficiency is improved, ultimately making the ozone more fully contacted with the pollutants in the sewage, and the ozone treatment effect in the sewage is better.

[0054] Reference Figure 1 and Figure 2 , the ozone decomposition device 3 includes a second breathing valve, which is arranged on the top wall of the ozone decomposition device 3 so as to be able to discharge excess tail gas in the ozone decomposition device 3. The ozone decomposition device 3 is the step after the sewage treatment device 2 is treated. There is ozone in the sewage treated by the sewage treatment device 2. In order to treat the ozone, it needs to be left to stand and decompose in the ozone decomposition device 3. During the decomposition process, some ozone and other gases will precipitate. At this time, they need to be transferred to the tail gas treatment device 4 through the second breathing valve for treatment. The ozone decomposition device 3 also includes a second water outlet trough and a second vent valve. The second water outlet trough is arranged at the upper part of the side wall of the ozone decomposition device 3 and is connected to the water outlet pipe, which is used to discharge the sewage after standing in the ozone decomposition device 3 out of the ozone decomposition device 3; the second vent valve is arranged at the bottom of the ozone decomposition device 3 to discharge excess sewage in the ozone decomposition device 3.

[0055] The treated sewage and ozone mixture continuously flows into the ozone decomposition device 3 and flows out of the second outlet trough when it reaches the second outlet trough. The second drain valve serves as an emergency valve. When the ozone decomposition device 3 needs to empty or partially discharge the sewage and ozone mixture, it is opened. This valve is simple and convenient to operate, allowing for real-time control of the liquid volume in the ozone decomposition device 3.

[0056] The device for treating sewage using ozone also includes: a liquid catalyst dosing device, a lifting pump, a flow meter, a cross-line water pipe and a regulating valve; the liquid catalyst dosing device is arranged on the sewage pipe 12, for adding liquid catalyst into the sewage pipe 12; the lifting pump is arranged on the sewage pipe 12, for increasing the flow rate of sewage; the flow meter is arranged on the sewage pipe 12 between the lifting pump and the sewage treatment device 2, for measuring the amount of sewage flowing into the sewage treatment device 2; the cross-line water pipe connects the outlet pipe and the sewage pipe 12, wherein the connection point between the cross-line water pipe and the sewage pipe 12 is located between the lifting pump and the flow meter; the regulating valve is arranged on the cross-line water pipe.

[0057] Reference Figure 1 and Figure 2 In a specific embodiment, a refinery project uses the ozone fluidized bed improved in this application; the water treatment capacity is 300m³ / h, the COD of the raw water is about 100mg / L, and the COD index of the salty wastewater needs to be treated to below 50mg / L; the specific inlet and outlet water quality requirements are shown in the following table:

[0058]

[0059] The water volume is 300m³ / h, COD is treated from 100mg / L to 50mg / L, different ozone dosages are added, and the air pipe is not used to supplement the air volume. The details are as follows:

[0060]

[0061] When the effluent meets the standard, 150 mg / L of ozone needs to be added, and the effluent COD is 46 mg / L.

[0062] According to the above technical solution, when the ozone dosage is selected as 150mg / L, in order to increase the circulation multiple and thus improve the ozone utilization rate, the air guide pipe at the bottom of the ozone fluidized bed is used to supplement the gas volume, as follows:

[0063] The operating data is as follows:

[0064]

[0065] When the ozone concentration is controlled at 150 mg / L, the gas volume is supplemented through the air duct. As the gas volume is supplemented, the utilization rate of ozone gradually increases. When the circulation multiple is increased from 3.5 times to 7.5 times, the COD removal rate increases from 54.5% to 63.4%. According to the downward trend of COD, it can be seen that a circulation volume of 6.5 times is more appropriate.

[0066] Referring to the above operation plan, the optimized ozone dosage is as follows:

[0067] The operating data is as follows:

[0068]

[0069] When the ozone dosage was adjusted by adding air through the air pipe and controlling the circulation volume to 6.5 times, the effluent COD reached 46 mg / L at an ozone dosage of 125 mg / L, meeting the effluent COD requirement. Further reductions in ozone dosage resulted in a drop in effluent COD, failing to meet the standard. This solution effectively reduced ozone dosage by 16.7%.

[0070] Compared with the previous process, this process has the following advantages:

[0071] 1. After adopting the ozone fluidized bed of this application, the effluent can stably meet the standard of effluent COD less than 50mg / L;

[0072] 2. The ozone dosage of this application can be saved by 10-20%, which means the cost can be saved by 10-20%.

[0073] 3. The ozone fluidized bed of the present application has a lower ratio of ozone dosage to COD removal, and a higher ozone utilization efficiency.

[0074] The implementation principle of Example 1 is as follows: during the sewage treatment process, a large amount of gas is transported to the interior of the fluidizing drum 22 through the air duct 24, thereby increasing the gas volume inside the fluidizing drum 22, allowing the ozone and sewage to maintain sufficient kinetic energy during the mixing process, so that the mixture of ozone and sewage can be continuously circulated in the fluidizing drum 22, ensuring the circulation multiples of the gas-water mixture and greatly improving the utilization rate of ozone.

[0075] Example 2

[0076] Reference Figure 3 The difference between this embodiment and embodiment 1 is that a drainage device 5 for controlling the flow of the ozone and sewage mixture is provided on the fluidizing cylinder 22. The drainage device 5 includes a drainage pipe 51 arranged around the wall of the fluidizing cylinder 22. The end of the air guide pipe 24 is connected to the drainage pipe 51. The length direction of the drainage pipe 51 is the same as the length direction of the fluidizing cylinder 22. The drainage pipe 51 extends vertically from the lower end of the fluidizing cylinder 22 into the fluidizing cylinder 22 and extends from the upper end of the fluidizing cylinder 22. During the process, it passes through multiple gas distribution plates 221 in sequence, and then The external drainage pipe 51 of the fluidizing cylinder 22 turns around and extends downward, and extends to the lower end of the fluidizing cylinder 22, and then turns around again and extends upward into the interior of the fluidizing cylinder 22, so that the drainage pipe 51 can be wrapped around the wall of the fluidizing cylinder 22; jet ports are evenly opened along the direction of the drainage pipe 51. During the flow of the gas-water mixture, the gas ejected from the jet ports can accelerate the flow speed of the gas-water mixture and form a continuous circulation inside the fluidizing cylinder 22, so that it can reach the required circulation multiples, thereby improving the utilization rate of ozone.

[0077] With reference to Figure 3 At each air injection port of the drainage pipe 51, an air injection pipe 52 is fixed, which is inclined and tilted towards the circulating flow direction of the gas-water mixture, so as to ensure the circulation of the gas-water mixture in and out of the fluidization cylinder 22 during the ozone and sewage mixing reaction process, and promote the flow of the gas-water mixture; a plurality of drainage devices 5 are arranged on the fluidization cylinder 22, which are evenly arranged along the axis of the fluidization cylinder 22, and the end of the air guide pipe 24 is communicated with the plurality of drainage pipes 51, so that the gas generated by the gas source can be delivered into the plurality of drainage pipes 51, thereby accelerating the circulation of the gas-water mixture and improving the flow speed of the gas-water mixture.

[0078] The implementation principle of Example 2 is that during the ozone and sewage circulating flow process, the plurality of drainage devices 5 arranged around the fluidization cylinder 22 can actively circulate the gas-water mixture in and out of the fluidization cylinder 22, thereby achieving the required circulation multiple, allowing the ozone to better treat the sewage and improving the treatment efficiency.

[0079] Example 3

[0080] With reference to Figure 4 And Figure 5 The difference between this embodiment and Example 1 is that the fluidization cylinder 22 is provided with a stirring device 6, which includes a stirring shaft 61 rotatingly arranged in the interior of the fluidization cylinder 22, the length direction of the stirring shaft 61 is the same as the length direction of the fluidization cylinder 22, and both are coaxially arranged, and the stirring shaft 61 penetrates through the plurality of gas distribution plates 221 and is rotationally connected with each gas distribution plate 221, a plurality of stirring blades 62 are uniformly fixed along the length direction of the stirring shaft 61, the stirring blades 62 are arranged between the adjacent two gas distribution plates 221, a driving assembly 63 for controlling the rotation of the stirring shaft 61 is arranged at the lower end of the stirring shaft 61, and during the ozone and sewage mixing reaction process, the driving assembly 63 controls the rotation of the stirring shaft 61, and the gas-water mixture is stirred by the stirring blades 62, so as to repeatedly contact the sewage with the ozone, enhance the oxidation effect, and thereby accelerate the reaction of the ozone and the sewage.

[0081] With reference to Figure 4 And Figure 5The driving assembly 63 includes a mounting box 631 fixed to the inner wall of the mixing barrel 21 and having a hollow structure. A stirring motor 632 is fixed inside the mounting box 631. The lower end of the stirring shaft 61 extends into the interior of the mounting box 631 and is fixed to the output shaft of the stirring motor 632. The rotation of the stirring shaft 61 is controlled by starting the stirring motor 632. The stirring shaft 61 and the stirring blade 62 are both hollow structures, and the stirring shaft 61 is connected to the stirring blade 62. A plurality of air outlets are provided on the stirring blade 62. A fixing ring 64 is provided at a position of the stirring shaft 61 near the stirring motor 632. The end of the air guide pipe 24 is connected to the fixing ring 64. The stirring shaft 61 and the fixing ring 64 are connected, and the stirring shaft 61 rotates in coordination with the fixing ring 64. A vent is provided on the stirring shaft 61 inside the fixing ring 64, so that the gas in the air duct 24 can be transported to the inside of the stirring shaft 61 without affecting the rotation of the stirring shaft 61. When the gas-water mixture is stirred, the gas in the air duct 24 can be transported to the stirring shaft 61 and the stirring blade 62, and ejected from the air outlet of the stirring blade 62, so that the stirring blade 62 can receive the external input gas during the stirring process, providing sufficient kinetic energy for the gas-water mixing, not only allowing the ozone and sewage to have a better oxidation reaction, but also allowing the gas-water mixture to circulate internally inside the fluidizing cylinder 22.

[0082] Reference Figure 4 and Figure 5 A circulation device 7 is provided in the area between the mixing drum 21 and the fluidizing drum 22. The circulation device 7 includes a rotating shaft 71 that is vertically rotated and arranged between the mixing drum 21 and the fluidizing drum 22. A vertical spiral blade 72 is fixed on the rotating shaft 71. The spiral blade 72 can stir the gas-water mixture above downward during the rotation process, so that the gas-water mixture flowing from the upper end of the fluidizing drum 22 flows downward under the action of the rotation of the spiral blade 72, thereby realizing circulation; the lower end of the rotating shaft 71 extends into the mounting box 631, and the rotating shaft 71 is rotatably connected to the mounting box 631. A plurality of groups of rotating shafts 71 and spiral blades 72 are uniformly arranged circumferentially between the fluidizing drum 22 and the mixing drum 21. A synchronous wheel 73 is fixed to the lower end of the rotating shaft 71 located inside the mounting box 631. In addition, a synchronous belt 74 is sleeved on multiple synchronous wheels 73, and a circulation motor 75 for controlling the rotation of one of the rotating shafts 71 is fixed inside the installation box 631. The output shaft of the circulation motor 75 is fixed to the lower end of the rotating shaft 71. During use, the circulation motor 75 controls multiple groups of rotating shafts 71 and spiral blades 72 to rotate simultaneously, so that the gas-water mixture flowing out from the upper end of the fluidizing cylinder 22 continues to flow downward to achieve circulation; a matching circular reversing plate 76 is fixed on the inner wall of the mixing cylinder 21 between the lower end of the fluidizing cylinder 22 and the installation box 631. The reversing plate 76 is horizontally arranged, and the middle of the reversing plate 76 is concave inward toward the fluidizing cylinder 22 to form a bulge. When the downward-flowing gas-water mixture contacts the reversing plate 76, it can flow upward into the fluidizing cylinder 22 again to form an internal circulation.

[0083] The principle of the embodiment of the example 3 is that in the mixed oxidation process of ozone and sewage, the gas-water mixture flows into the fluidizing cylinder 22 first, and the stirring speed is increased by the stirring of the stirring blade 62, the gas-water mixture flowing out of the upper end of the fluidizing cylinder 22 flows towards the lower end of the fluidizing cylinder 22 under the action of the spiral blade 72, and flows into the fluidizing cylinder 22 again under the action of the reversing plate 76, thereby forming a circulation, and the gas-water mixture repeatedly circulates in the fluidizing cylinder 22, thereby increasing the utilization rate of ozone.

[0084] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A synergistic ozone fluidized bed, characterized by: It comprises a gas-liquid mixing device (1), a sewage treatment device (2) connected to the gas-liquid mixing device (1), an ozone decomposition device (3) connected to the sewage treatment device (2), and an exhaust gas treatment device (4) connected to the ozone decomposition device (3); The gas-liquid mixing device (1) is connected to a pressurized ozone pipe (11) for conveying pressurized ozone and a sewage pipe (12) for conveying sewage to be treated, and is used to pre-mix the pressurized ozone and the sewage to be treated; The sewage treatment device (2) comprises a mixing cylinder (21) and a fluidizing cylinder (22) arranged inside the mixing cylinder (21); the fluidizing cylinder (22) is connected to the bottom of the gas-liquid mixing device (1) and is used for fully reacting the pressurized ozone and the sewage; a multi-layer gas distribution plate (221) is provided inside the fluidizing cylinder (22); the gas distribution plate (221) is used for cutting ozone bubbles and increasing the contact area between ozone and sewage; The ozone decomposition device (3) is connected to the top of the sewage treatment device (2) and is used to decompose the ozone remaining after the sewage is treated; The tail gas treatment device (4) is connected to the top of the sewage treatment device (2) and the ozone decomposition device (3) and is used to treat excess tail gas in the sewage treatment device (2) and the ozone decomposition device (3); The lower end of the fluidizing cylinder (22) is connected to an air guide pipe (24), and the air guide pipe (24) is connected to an external gas source and is used to transport gas into the fluidizing cylinder (22).

2. The ozone enhanced fluidized bed according to claim 1, characterized in that: An aeration plate (241) is fixed to the end of the air guide pipe (24) close to the fluidizing cylinder (22). The aeration plate (241) is communicated with the air guide pipe (24), and dense aeration holes are provided on the aeration plate (241).

3. The ozone enhanced fluidized bed according to claim 1, characterized in that: The diameter of the bottom of the fluidizing cylinder (22) is larger than the diameter of the top of the cylinder, so that the mixed liquid of pressurized ozone and sewage forms a Venturi effect in the fluidizing cylinder (22).

4. The ozone enhanced fluidized bed according to claim 1, characterized in that: The sewage treatment device (2) further comprises a guide plate (23) arranged above the fluidizing cylinder (22); the guide plate (23) is capable of changing the flow direction of the sewage and the pressurized ozone, and forming an internal circulation.

5. The synergistic ozone fluidized bed according to claim 1, characterized in that: The fluidizing cylinder (22) is provided with a drainage device (5), the drainage device (5) comprising a drainage pipe (51) arranged along the length direction of the fluidizing cylinder (22), the drainage pipe (51) being in communication with the air guide pipe (24), the drainage pipe (51) being arranged around the cylinder wall of the fluidizing cylinder (22), and a plurality of air jets being uniformly provided along the length direction of the drainage pipe (51), so that a mixed liquid of pressurized ozone and sewage is internally circulated along the direction of the drainage pipe (51).

6. The synergistic ozone fluidized bed according to claim 5, characterized in that: An inclined jet pipe (52) is fixed at the jet outlet of the drainage pipe (51), and the jet pipe (52) is inclined along the flow direction of the sewage.

7. The synergistic ozone fluidized bed according to claim 5, characterized in that: The drainage devices (5) are provided in multiple groups, and the multiple groups of drainage devices (5) are evenly arranged along the circumference of the fluidizing cylinder (22), and the air guide pipe (24) is connected to the multiple drainage pipes (51).

8. The synergistic ozone fluidized bed according to claim 1, characterized in that: A stirring device (6) is installed on the fluidizing cylinder (22), and the stirring device (6) includes a stirring shaft (61) rotatably arranged in the fluidizing cylinder (22). A plurality of stirring blades (62) are fixed on the stirring shaft (61), and each group of stirring blades (62) is located between adjacent gas distribution plates (221). A driving component (63) for driving the stirring shaft (61) to rotate is provided at the lower end of the stirring shaft (61).

9. The synergistic ozone fluidized bed according to claim 8, characterized in that: The stirring shaft (61) and the stirring blade (62) are both hollow structures, and the stirring blade (62) is connected to the stirring shaft (61). An air outlet is provided on the stirring blade (62). The air guide pipe (24) is connected to the inside of the stirring shaft (61), and the air guide pipe (24) and the stirring shaft (61) are rotatably matched.

10. The synergistic ozone fluidized bed according to claim 1, characterized in that: A circulation device (7) is provided in the area between the fluidizing cylinder (22) and the mixing cylinder (21). The circulation device (7) includes a spiral blade (72) rotatably provided inside the mixing cylinder (21) for allowing the mixed liquid at the top of the fluidizing cylinder (22) to flow downward under the rotation of the spiral blade (72). A reversing plate (76) fixed to the mixing cylinder (21) is provided at the lower end of the fluidizing cylinder (22) for reversing the mixed liquid flowing downward and guiding it into the fluidizing cylinder (22).

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