A stirring device for ozone catalytic oxidation of wastewater and a reaction tank thereof

Abstract

The present application relates to sewage treatment technical field, especially a kind of stirring device and its reaction tank for ozone catalytic oxidation wastewater, including cylinder, the middle part of cylinder is contracted and is formed with contraction part, contraction part divides cylinder into upper cone part and lower cone part, contraction part is equipped with outer blade for driving water flow downward movement, and outer blade has the cavity that is connected with the inside of cylinder and the outside of cylinder, and lower cone part inner chamber bottom end is equipped with ozone aeration head and the inner blade for driving water flow upward movement;The present application utilizes outer blade to drive water flow downward movement into the inside of cylinder, inner blade drives water flow upward movement from the cavity of outer blade and flows out cylinder, to form circulation in this way, powder-like ozone catalyst and ozone added in water also contact with water flow in circulation, can avoid the influence of bubble and float or adhere on cylinder wall surface, in addition, catalyst powder precipitated in bottom can be reabsorbed and contacted with ozone sufficiently, promote organic oxidation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a stirring device and its reaction tank for ozone catalytic oxidation of wastewater. Background Technology

[0002] In recent years, the freshwater crisis has deepened, and people have become increasingly aware of the harm that industrial waste pollution poses to ecosystems and human health, highlighting the growing importance of water treatment. Industrial activities generate large amounts of toxic and harmful substances, among which dye pollution has attracted much attention due to its high toxicity, chemical stability, non-biodegradability, and carcinogenicity. To date, advanced oxidation processes (AOPs) have become one of the most promising methods for degrading organic pollutants in wastewater. Among AOPs, ozone catalytic oxidation is a highly efficient catalytic process, and the unique form of ozone ensures that the products after decomposing and oxidizing pollutants are harmless.

[0003] Current research on ozone catalytic oxidation processes mainly focuses on developing more efficient catalysts for ozone decomposition. In practical applications, tower reactors are typically used, with bottom aeration to fix the catalyst on a support and catalyze the reaction within the tower. However, this type of reactor has a small contact area between the catalyst and water, resulting in excessively long contact time between the catalyst and the wastewater. This makes it unsuitable for treating large volumes of wastewater and also requires a large amount of catalyst, increasing investment costs. Powdered catalysts, on the other hand, have a large contact area and good dispersibility, which can significantly improve the efficiency of the catalytic reaction. Currently, most ozone catalysts are added to wastewater uniformly through mechanical stirring. This method has certain drawbacks. For example, when treating large volumes of wastewater, directly adding powdered catalyst to the treatment tank can cause floating bubbles to form on the surface of the tank after the gas is blown in. This can lead to the catalyst and bubbles adhering to or even floating on the water surface, preventing them from participating in the catalytic ozone oxidation process in a timely manner. Even with mechanical stirring devices at the bottom, it is difficult to fully and uniformly mix the large amount of wastewater and the floating catalyst. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the problem that in the prior art, after the powdered ozone catalyst is directly added to the wastewater, the catalyst and bubbles adhere to or even float on the water surface and cannot participate in the catalytic ozone oxidation process in a timely manner, a stirring device and its reaction tank for ozone catalytic oxidation of wastewater are provided.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a stirring device for ozone catalytic oxidation of wastewater, comprising a cylindrical body, which is inverted, i.e., closed at the top and open at the bottom. The middle part of the cylinder is contracted to form a contraction section, which divides the cylinder into an upper conical part that is larger at the top and smaller at the bottom and a lower conical part that is smaller at the top and larger at the bottom. The bottom diameter of the lower conical part is larger than the top diameter of the upper conical part, and the inner cavity of the upper conical part is connected to the inner cavity of the lower conical part.

[0006] The contraction section is equipped with outer blades for driving water flow downwards, and the outer blades have cavities connecting the inside and outside of the cylinder. The bottom end of the lower cone is open, and the bottom end of the inner cavity of the lower cone is provided with several ozone aeration heads and inner blades for driving water flow upwards. The inner and outer blades rotate in opposite directions. The top end of the upper cone is provided with a catalyst inlet that can be opened or closed for the ozone catalyst to enter.

[0007] During operation, the entire device is fixed in the wastewater treatment tank with the cylinder submerged in water. Powdered ozone catalyst is added through the catalyst inlet, and ozone is blown in through the ozone aerator. Simultaneously, the outer and inner blades rotate. The rotation of the outer blades causes the water to flow downwards, while the rotation of the inner blades causes the water to flow upwards. As the outer blades rotate, the upward-flowing water inside the cylinder enters the cavity of the outer blades and is then thrown out to the outside of the cylinder. At the same time, the powdered catalyst that has entered the cylinder is also thrown out along with the water flow and dispersed throughout the treatment tank. This creates a flow pattern where water enters the cylinder from the bottom, moves upwards, flows out of the cylinder from the outer blades, and then moves downwards back into the cylinder. Driven by this water flow, the ozone catalyst is continuously pushed into the cylinder and comes into contact with the ozone, causing it to be catalyzed to form hydroxyl radicals. These radicals oxidize organic matter in the water, ensuring full utilization of the ozone. Furthermore, the ozone ejected from the cavity of the outer blades undergoes cross-movement due to the downward flow of water, extending its residence time in the water and improving its efficiency.

[0008] The above technical solution utilizes the outer blades to drive the water flow downwards into the cylinder, while the inner blades drive the water flow upwards and out of the cylinder through the cavity of the outer blades, thus forming a circulation. The powdered ozone catalyst and ozone added to the water also come into full contact with the water flow during the circulation, which can prevent them from floating or adhering to the cylinder wall due to the influence of air bubbles. In addition, the catalyst powder settled at the bottom can be re-absorbed and come into full contact with ozone, promoting the oxidation of organic matter.

[0009] Furthermore, several ozone aerators are spaced apart circumferentially along the lower cone, and the ozone aerators are slidably connected to the lower cone to form an integral design of the cylinder and the ozone aerators.

[0010] Furthermore, the inner peripheral wall of the lower cone is provided with a track, and the ozone aeration head is provided with a slider that cooperates with the track. The cross-section of the track and the slider is T-shaped or dovetail-shaped to prevent them from separating.

[0011] Furthermore, the stirring device also includes a drive mechanism for driving the outer blades and inner blades to rotate synchronously. The drive mechanism includes a motor, and the output end of the motor is connected to a rotating shaft via a coupling. The cylinder and the inner blades are both connected to the rotating shaft. When the motor is started, it drives the rotating shaft to rotate, and the rotating shaft drives the cylinder and the inner blades to rotate synchronously. The outer blades on the cylinder rotate accordingly.

[0012] A reaction tank includes a tank body and the aforementioned stirring device. The tank body is provided with a first overflow plate and a second overflow plate, which divide the tank body into a first sedimentation chamber, a reaction chamber, and a second sedimentation chamber that are connected in sequence. The stirring device is located in the reaction chamber. The first sedimentation chamber has an inlet, and the second sedimentation chamber has an outlet. During operation, wastewater enters the first sedimentation chamber through the inlet, allowing suspended solids carried in the water to settle fully, reducing the subsequent treatment pressure of the device. After sedimentation, the water overflows through the first overflow plate into the middle reaction chamber. The stirring device is turned on, and as the water inflow increases, the reacted water overflows from above the second overflow plate into the second sedimentation zone, and finally flows out from the outlet.

[0013] Furthermore, the cross-sectional area of ​​the reaction chamber is larger than the cross-sectional areas of the first precipitation chamber and the second precipitation chamber.

[0014] The beneficial effects of this invention are as follows: This invention utilizes the outer blades to drive the water flow downwards into the cylinder, while the inner blades drive the water flow upwards and out of the cylinder from the cavity of the outer blades, thus forming a circulation. The powdered ozone catalyst and ozone added to the water also come into full contact with the water flow during the circulation, which can prevent them from floating or adhering to the cylinder wall due to the influence of air bubbles. In addition, the catalyst powder settled at the bottom can be re-absorbed and come into full contact with ozone, promoting the oxidation of organic matter. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1;

[0017] Figure 2 This is a schematic diagram of the structure of Example 2;

[0018] In the picture:

[0019] 1. Cylinder body; 101. Contraction section; 102. Upper cone section; 1021. Catalyst inlet; 103. Lower cone section; 1031. Track; 2. Outer blades; 201. Cavity; 3. Inner blades; 4. Ozone aerator head; 5. Motor; 6. Rotating shaft; 7. Tank body; 701. First sedimentation chamber; 7011. Inlet; 702. Reaction chamber; 703. Second sedimentation chamber; 7031. Outlet; 8. First overflow plate; 9. Second overflow plate. Detailed Implementation

[0020] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention, and directions and references, such as up, down, left, right, etc., are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0021] Example 1:

[0022] like Figure 1 As shown, the present invention is a stirring device for ozone catalytic oxidation of wastewater, comprising: a cylindrical body 1, which is inverted, i.e., closed at the top and open at the bottom. The middle part of the cylindrical body 1 is contracted to form a contraction part 101, which divides the cylindrical body 1 into an upper conical part 102 that is larger at the top and smaller at the bottom and a lower conical part 103 that is smaller at the top and larger at the bottom. The bottom diameter of the lower conical part 103 is larger than the top diameter of the upper conical part 102, and the inner cavity of the upper conical part 102 and the inner cavity of the lower conical part 103 are interconnected.

[0023] The contraction section 101 is equipped with an outer blade 2 for driving the water flow downward, and the outer blade 2 has a cavity 201 connecting the inside of the cylinder 1 and the outside of the cylinder 1. The bottom end of the lower cone section 103 is open, and the bottom end of the inner cavity of the lower cone section 103 is provided with a plurality of ozone aeration heads 4 and an inner blade 3 for driving the water flow upward. Ozone is blown in through the ozone aeration heads 4. The inner blade 3 and the outer blade 2 rotate in opposite directions. The top end of the upper cone section 102 is provided with a catalyst inlet 1021 that can be opened or closed for the ozone catalyst to enter.

[0024] The outer blade 2 and the inner blade 3 are driven to rotate synchronously by a drive mechanism. The drive mechanism includes a motor 5, and the output end of the motor 5 is connected to a rotating shaft 6 through a coupling. The cylinder 1 and the inner blade 3 are both connected to the rotating shaft 6. When the motor 5 starts, it drives the rotating shaft 6 to rotate. The rotating shaft 6 drives the cylinder 1 and the inner blade 3 to rotate synchronously. The outer blade 2 on the cylinder 1 rotates accordingly, causing the water to flow downward. The inner blade 3 causes the water to flow upward to form a circulation.

[0025] Several ozone aerators 4 are spaced apart along the circumference of the lower cone 103, and the ozone aerators 4 are slidably connected to the lower cone 103. The inner circumferential wall of the lower cone 103 is provided with a track 1031, and the ozone aerators 4 are provided with a slider that cooperates with the track 1031. The cross-section of the track 1031 and the slider is T-shaped or dovetail-shaped to prevent them from separating.

[0026] Working principle:

[0027] During operation, the entire device is fixed in the wastewater treatment tank, with the cylinder 1 submerged in water. Powdered ozone catalyst is added through the catalyst inlet 1021, and ozone is blown in through the ozone aerator 4. Simultaneously, the outer blades 2 and inner blades 3 rotate. The rotation of the outer blades 2 causes the water to flow downwards, while the rotation of the inner blades 3 causes the water to flow upwards. As the outer blades 2 rotate, the upward-flowing water inside the cylinder 1 enters the cavity 201 of the outer blades 2 and is then thrown out to the outside of the cylinder 1. At the same time, the powdered catalyst that has entered the cylinder 1 is also thrown out along with the water flow and dispersed into the treatment tank. Throughout the cylinder, water flows from the bottom of the cylinder 1 into the cylinder 1, moves upward, flows out of the cylinder 1 from the outer blade 2, and then moves downward back into the cylinder 1. Driven by this water flow, the ozone catalyst is continuously pushed into the cylinder 1 and comes into contact with the ozone, causing the ozone to be catalyzed into hydroxyl radicals, which oxidize the organic matter in the water, thus fully utilizing the ozone. Furthermore, after the ozone is ejected from the cavity 201 of the outer blade 2, it also undergoes cross-movement due to the downward movement of the water, extending the ozone's residence time in the water and improving its utilization efficiency.

[0028] Example 2:

[0029] like Figure 2 As shown, Embodiment 2 provides a reaction tank, including a tank body 7 and the aforementioned stirring device. The tank body 7 is provided with a first overflow plate 8 and a second overflow plate 9. The first overflow plate 8 and the second overflow plate 9 divide the tank body 7 into a first sedimentation chamber 701, a reaction chamber 702, and a second sedimentation chamber 703 that are connected in sequence. The cross-sectional area of ​​the reaction chamber 702 is larger than the cross-sectional areas of the first sedimentation chamber 701 and the second sedimentation chamber 702. The stirring device is located in the reaction chamber 702. The first sedimentation chamber 701 has an inlet 7011, and the second sedimentation chamber 703 has an outlet 7031. During operation, wastewater enters the first sedimentation chamber 701 from the inlet 7011, allowing the suspended solids carried in the water to settle fully, reducing the subsequent processing pressure of the device. After sedimentation, the water overflows through the first overflow plate 8 into the middle reaction chamber 702. The stirring device is turned on. As the water inflow increases, the reacted water overflows from above the second overflow plate 9 into the second sedimentation zone 702, and finally flows out from the outlet 703.

[0030] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A stirring device for catalytic ozonation of wastewater, characterized by: The barrel (1) is provided with a contraction part (101) at the middle part, which divides the barrel (1) into an upper taper part (102) and a lower taper part (103) with the upper taper part (102) being larger than the lower taper part (103) and the inner cavity of the upper taper part (102) being communicated with the inner cavity of the lower taper part (103); The contraction part (101) is provided with an outer blade (2) for driving the water flow downward, and the outer blade (2) has a cavity (201) for communicating the inside of the barrel (1) with the outside of the barrel (1), the bottom of the lower taper part (103) is open, and the bottom of the inner cavity of the lower taper part (103) is provided with a plurality of ozone aeration heads (4) and an inner blade (3) for driving the water flow upward, and the top of the upper taper part (102) is provided with an openable and closable catalyst inlet (1021) for the ozone catalyst. The outer blade (2) rotates to drive the water flow downward, and the inner blade (3) rotates to drive the water flow upward, which forms a circulation structure of the water flow being pressed into the barrel (1) from the bottom of the barrel (1), the water flow moving upward, the water flow flowing out of the barrel (1) from the outer blade (2), and the water flow being pressed into the barrel (1) downward.

2. The stirring device for catalytic ozonation of wastewater according to claim 1, characterized in that: The ozone aeration heads (4) are arranged along the circumference of the lower taper part (103) at intervals, and the ozone aeration heads (4) are in sliding connection with the lower taper part (103).

3. The stirring device for catalytic ozonation of wastewater according to claim 2, characterized in that: The inner circumferential wall of the lower taper part (103) is provided with a track (1031), and the ozone aeration heads (4) are provided with sliding blocks matched with the track (1031).

4. The stirring device for catalytic ozonation of wastewater according to claim 1, characterized in that: The stirring device further comprises a driving mechanism for driving the outer blade (2) and the inner blade (3) to rotate, the driving mechanism comprising a motor (5), the output end of the motor (5) being connected with a rotating shaft (6), and the barrel (1) and the inner blade (3) being connected with the rotating shaft (6).

5. A reactor tank comprising a stirring device for catalytic ozonation of wastewater according to any one of claims 1 to 4, characterized in that: The pool body (7) is provided with a first overflow plate (8) and a second overflow plate (9) inside, the first overflow plate (8) and the second overflow plate (9) dividing the pool body (7) into a first sedimentation chamber (701), a reaction chamber (702) and a second sedimentation chamber (703) communicated in sequence, the stirring device being located in the reaction chamber (702), the first sedimentation chamber (701) being provided with a water inlet (7011), and the second sedimentation chamber (703) being provided with a water outlet (7031).

6. A reactor cell according to claim 5, wherein: The cross-sectional area of the reaction chamber (702) is larger than the cross-sectional areas of the first sedimentation chamber (701) and the second sedimentation chamber (703).

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