Small-scale test device for ozone catalysis system

Abstract

The utility model discloses a small-scale test device for an ozone catalytic system, which comprises a catalytic unit, liquid transmission units and gas treatment units, catalytic reaction can be carried out in the catalytic unit, the liquid transmission units are communicated and arranged on two sides of the catalytic unit, and the gas treatment units are communicated and arranged at the top end and the bottom end of the catalytic unit; the catalytic unit comprises a shell, a cavity for providing catalytic reaction is formed in the shell, and an opening is formed in the top end of the shell and used for cleaning and maintaining the catalytic unit; the cover plate is placed at the top end of the shell and seals the opening; the bearing disc is used for bearing the catalyst layer and comprises a first supporting plate and a gauze element, the first supporting plate is fixed to the position of one third to one half of the height of the shell, the first supporting plate is parallel to the bottom face of the shell and fixed to the inner wall of the shell, and the size of the first supporting plate is consistent with that of the bottom face of the shell; a plurality of first circulating holes are formed in the surface of the first supporting plate; the gauze element is arranged on the upper surface of the first supporting plate.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a small-scale test device of an ozone catalysis system. Background Art

[0002] Chemical Oxygen Demand (COD) represents the amount of oxygen required to oxidize one liter of organic matter in sewage using an oxidizing agent such as potassium dichromate or potassium permanganate under strongly acidic conditions. It roughly indicates the amount of organic matter in sewage. COD is a key indicator of organic pollution in water bodies and reflects the degree of contamination.

[0003] At present, the COD treatment technologies in the field of sewage treatment are mainly biological, physical (activated carbon adsorption technology), and chemical (chemical oxidation technology, ozone oxidation technology, etc.). Among them, ozone oxidation technology has the advantages of simple process, convenient ozone preparation, flexible operation, and no secondary pollution. Its principle is mainly the process of oxidizing organic matter by producing hydroxyl radicals (·OH) under the action of ozone catalyst. The ·OH produced by the decomposition of O3 acts as a strong oxidant and reacts almost non-selectively with all pollutants in the sewage, breaking the chain of large molecular organic matter in the pollutants into small molecular organic matter, and finally converting it into carbon dioxide and water. Therefore, ozone catalytic oxidation technology has received much attention in the field of sewage treatment, especially in the field of deep sewage treatment, where it plays an important role in removing difficult-to-degrade organic matter and removing color.

[0004] The existing utility model technologies for ozone catalytic systems are mainly based on engineering applications. For engineering design, the selection and verification of catalysts and the verification of ozone catalytic degradation capacity of COD are key steps. Therefore, it is necessary to design a simple, low-cost, and adjustable device to meet the engineering design requirements of catalyst selection and sewage degradation capacity verification. Utility Model Content

[0005] The purpose of the utility model is to provide a small-scale test device for an ozone catalytic system, which has the advantages of simple structure, easy construction and low cost. It is used for the selection and verification of catalysts and the verification of sewage treatment effects in the early design of sewage treatment systems, and quickly provides supporting data for engineering design and application.

[0006] In order to achieve the above-mentioned object, the utility model provides a pilot device of an ozone catalytic system, comprising: a catalytic unit, a liquid transmission unit, and a gas processing unit. A catalytic reaction can occur inside the catalytic unit. The liquid transmission unit is connected to both sides of the catalytic unit, and the gas processing unit is connected to the top and bottom ends of the catalytic unit.

[0007] The catalytic unit comprises:

[0008] A housing, wherein a cavity for providing a catalytic reaction is provided inside the housing and an opening is provided at the top thereof for cleaning and maintenance of the catalytic unit;

[0009] a cover plate, placed on the top of the housing to seal the opening;

[0010] A supporting tray for supporting the catalytic layer, comprising: a first supporting plate and a gauze; the first supporting plate is fixed at one-third to one-half of the height of the outer shell, is fixed on the inner wall of the outer shell parallel to the bottom surface of the outer shell, and its size is consistent with the bottom surface of the outer shell; a plurality of first flow holes are provided on the surface of the first supporting plate; the gauze is arranged on the upper surface of the first supporting plate.

[0011] Optionally, a second support plate is further provided on the upper surface of the catalytic layer; the size of the second support plate is consistent with that of the first support plate, and a plurality of second flow holes are provided on the surface of the second support plate.

[0012] Optionally, a first through hole and a second through hole are provided at the bottom of the side wall of the shell, which serve as the feed port of the catalytic unit; a third through hole is provided at the top of the side wall of the shell, which serves as the discharge port of the catalytic unit, and the height difference between the feed port and the discharge port is proportional to the residence time of the sewage in the catalytic unit.

[0013] Optionally, the third through hole of the housing is arranged on opposite side walls of the first through hole and the second through hole, and the distance between the third through hole and the top of the housing is greater than 5 cm.

[0014] Optionally, the cover plate is detachable, and a fourth through hole is provided on its surface to discharge the gas in the catalytic unit.

[0015] Optionally, the liquid transfer unit includes:

[0016] A water inlet pipe is connected to the first through hole of the housing and transmits the sewage to be treated to the catalytic unit;

[0017] The first flow meter is installed on the water inlet pipe and can control the flow rate of the sewage to be treated into the catalytic unit;

[0018] The water outlet pipe is connected to the third through hole of the shell to discharge the treated sewage.

[0019] Optionally, the gas processing unit includes:

[0020] an air inlet pipe, connected to the second through hole of the housing, for transmitting ozone gas into the catalytic unit;

[0021] A second flow meter is provided on the air inlet pipe to control the flow rate of the ozone gas entering the catalytic unit;

[0022] An air distribution pipe is placed at the bottom end of the housing and includes a main pipe and several branch pipes; one end of the main pipe is connected to the air inlet pipe and the other end is sealed; the surface of the main pipe is provided with two symmetrically arranged rows of mounting holes, with the spacing between each mounting hole in each row being the same; one end of several branch pipes is connected to the main pipe via a joint so that the end of the branch pipe corresponds to the mounting hole on the main pipe, and the other end of the branch pipe is sealed;

[0023] The gas outlet pipe is connected to the fourth through hole of the cover plate and discharges the ozone gas that has not participated in the reaction in the catalytic unit and the gas generated after the reaction.

[0024] Optionally, a plurality of air outlet holes are evenly distributed on the surface of the branch pipe, so that the ozone gas is evenly discharged from the air distribution pipe in the form of bubbles; the aperture range of the air outlet holes is between 0.2-2 mm.

[0025] Optionally, a rubber film is provided on the surface of the branch pipe, and a plurality of micro air vents are provided on the surface of the rubber film, wherein the pore diameter of the micro air vents is less than 0.5 microns.

[0026] Optionally, the gas treatment unit further includes: an exhaust gas processor, which is arranged on the cover plate and connected to the outlet pipe; a temperature-rising resistance wire is provided inside the exhaust gas processor to convert unreacted ozone in the outlet pipe into oxygen and discharge it into the atmosphere.

[0027] Compared with the prior art, the technical solution of the present utility model has at least the following beneficial effects:

[0028] The device of the utility model has a simple structure and is easy to build. It can be built with acrylic plates of low cost, which is low in cost. The internal structure can be adjusted according to experimental requirements, which is convenient for the selection and verification of catalysts and the verification of sewage treatment effects in the early engineering design, and quickly provides supporting data for engineering design and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of a small-scale test device of an ozone catalysis system of the present utility model.

[0030] Figure 2 This is a schematic structural diagram of the gas distribution pipe in the small-scale test device of the ozone catalysis system of the present utility model.

[0031] In the figure, 1-shell, 2-cover plate, 3-support tray, 31-catalytic layer, 41-water inlet pipe, 42-water outlet pipe, 43-first flow meter, 51-air inlet pipe, 52-air outlet pipe, 53-second flow meter, 54-air distribution pipe, 541-main pipe, 542-branch pipe, 6-exhaust gas processor. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0035] like Figure 1 The ozone catalytic system pilot device of the present invention includes: a catalytic unit, a liquid transmission unit, and a gas processing unit. A catalytic reaction can occur inside the catalytic unit. The liquid transmission unit is connected and arranged on both sides of the catalytic unit. The gas processing unit is connected and arranged at the top and bottom ends of the catalytic unit.

[0036] The catalytic unit includes: a cover plate 2, an outer shell 1, and a support tray 3. The outer shell 1 is a rectangular structure with an opening on the top, and a cavity is provided inside for catalytic reaction. The top opening is used for cleaning and maintenance of the device of the present invention; the bottom of the side wall of the outer shell 1 is provided with a first through hole and a second through hole in sequence from top to bottom in the vertical direction, which are the feed port of the catalytic unit; the top of the side wall of the outer shell 1 is provided with a third through hole, which is the discharge port of the catalytic unit. The height difference between the feed port and the discharge port of the catalytic unit is proportional to the residence time of the sewage in the catalytic unit. The cover plate 2 is detachably arranged at the top of the outer shell 1, and the top opening of the outer shell 1 is sealed by sealant when in use; the surface of the cover plate 2 is provided with a fourth through hole, and the fourth through hole can discharge the gas after the reaction in the catalytic unit.

[0037] In a preferred embodiment, the third through hole of the housing 1 is arranged on the opposite side wall of the first through hole and the second through hole, and the distance between the third through hole and the top of the housing 1 is greater than 5 cm, reserving space for the escape of gas in the catalytic unit and preventing sewage from entering the fourth through hole on the cover plate 2.

[0038] The support tray 3 is used to support the catalytic layer 31. The catalytic layer 31 is usually filled with silicon-based, carbon-based or aluminum-based spherical catalyst particles with a diameter of 2-4 mm. It can stabilize the flow of the fluid flowing through the catalytic layer 31 and increase the residence time of the sewage in the catalytic unit.

[0039] The support tray 3 includes: a first support plate and a gauze. The first support plate is fixed at a position between one-third and one-half of the height of the outer shell 1. It is fixed to the inner wall of the outer shell 1 parallel to the bottom surface of the outer shell 1, and its size is consistent with the bottom surface of the outer shell 1, dividing the internal cavity of the outer shell 1 into a first inner cavity below and a second inner cavity above. A plurality of first flow holes are provided on the surface of the first support plate to connect the first inner cavity with the second inner cavity. The gauze is arranged on the upper surface of the first support plate, and its pore diameter is between 1-2 mm to prevent the catalyst particles in the catalytic layer 31 from clogging the first flow holes on the first support plate.

[0040] Furthermore, when the density of the catalytic layer 31 is less than or equal to the density of the sewage, a second support plate can be placed on the upper surface of the catalytic layer 31 to prevent the catalyst particles therein from floating up. Specifically, the size of the second support plate is consistent with that of the first support plate, and it is fixed to the inner wall of the outer shell 1, further dividing the second inner cavity into a third inner cavity and a fourth inner cavity, and a plurality of second flow holes are provided on its surface to connect the third inner cavity with the fourth inner cavity. It can be understood that at this time, the internal cavity of the entire outer shell 1 is divided into the first inner cavity, the third inner cavity and the fourth inner cavity from bottom to top by the first support plate and the second support plate in sequence, and the catalytic layer 31 is arranged in the third inner cavity.

[0041] In a preferred embodiment, the thickness of the supporting tray 3 is greater than 3 mm, and a number of flow holes are evenly distributed on the surfaces of the first support plate and the second support plate. The aperture of each flow hole is smaller than the diameter of the catalyst particles, and the spacing between adjacent flow holes is greater than or equal to twice the diameter of the catalyst particles.

[0042] The liquid transfer unit includes an inlet pipe 41, an outlet pipe 42, and a first flowmeter 43. The inlet pipe 41 is connected to the first through-hole of the housing 1 and transfers the treated wastewater to the first inner cavity of the housing 1 of the catalytic unit. The first flowmeter 43, located on the inlet pipe 41, controls the flow rate of the treated wastewater into the catalytic unit. The outlet pipe 42 is connected to the third through-hole of the housing 1 and discharges the treated wastewater.

[0043] The gas treatment unit includes: an air inlet pipe 51, an air distribution pipe 54, an air outlet pipe 52, a second flow meter 53, and an exhaust gas processor 6. The air inlet pipe 51 is connected to the second through hole of the outer shell 1, and is used to transmit the ozone gas into the first inner cavity of the outer shell 1 of the catalytic unit. The second flow meter 53 is set on the air inlet pipe 51, and is used to control the flow rate of the gas entering the catalytic unit. The air outlet pipe 52 is connected to the fourth through hole of the cover plate 2, and discharges the ozone gas that does not participate in the reaction in the catalytic unit and the carbon dioxide gas generated after the reaction. The exhaust gas processor 6 is set on the cover plate 2 and is connected to the air outlet pipe 52; the exhaust gas processor 6 is provided with a resistance wire inside, which can be heated to 400°C to convert the unreacted ozone in the air outlet pipe 52 into oxygen and discharge it into the atmosphere.

[0044] like Figure 2 As shown, the air distribution pipe 54 is placed at the bottom end of the first inner cavity of the shell 1, and includes: a main pipe 541 and several branch pipes 542. One end of the main pipe 541 is connected to the air inlet pipe 51, and the other end is sealed; the surface of the main pipe 541 is provided with two rows of mounting holes arranged symmetrically, and the spacing between each mounting hole in each row is the same. One end of several branch pipes 542 is connected to the main pipe 541 through a joint, so that the port of the branch pipe 542 corresponds to the mounting hole on the main pipe 541, and the other end of the branch pipe 542 is sealed; a plurality of air outlet holes are evenly distributed on the surface of each branch pipe 542, so that ozone gas can be evenly discharged from the air distribution pipe 54 in the form of bubbles; and the aperture range of the air outlet holes is between 0.2-2mm.

[0045] In a preferred embodiment, a rubber membrane containing a large number of micro-pores can be further provided on the surface of the branch pipe 542, and the pore size of the micro-pores on the rubber membrane is less than 0.5 microns, so that the diameter of the bubbles diffused from the air distribution pipe 54 is smaller, the area of ​​the gas-liquid interface is increased, and the mass transfer efficiency is improved.

[0046] During sewage treatment in the present invention, the sewage to be treated enters the first inner cavity of the catalytic unit through the water inlet pipe 41. The flow rate of the sewage to be treated can be adjusted by the first flowmeter 43, thereby controlling the residence time of the sewage to be treated in the catalytic unit. Simultaneously, ozone gas enters the air distribution pipe 54 through the air inlet pipe 51 and is discharged from the air distribution pipe 54 into the first inner cavity of the catalytic unit in the form of bubbles. The flow rate of the ozone gas can be adjusted by the second flowmeter 53, thereby controlling the density of the ozone gas bubbles in the sewage. At this time, the sewage and ozone bubbles in the first inner cavity are moved upward by the water pressure. When passing through the support tray 3 and catalytic layer 31 in the third inner cavity, the residence time of the sewage and ozone bubbles in the catalytic unit is further increased, ensuring sufficient contact between the sewage and ozone. Simultaneously, under the action of the catalyst, the ozone will rapidly decompose pollutants in the sewage, breaking down the chains of large organic molecules into small organic molecules, and ultimately converting the pollutants into carbon dioxide and water. The treated wastewater is discharged through outlet pipe 42, which communicates with the fourth inner chamber. Unreacted ozone and carbon dioxide produced in the catalytic unit are discharged through outlet pipe 52 at the top and enter exhaust gas processor 6 for ozone removal before being discharged into the atmosphere. The wastewater's residence time in the catalytic unit is controlled between 0.5 and 2 hours.

[0047] Example 1

[0048] In this embodiment, the device's housing 1, cover plate 2, and first support plate are all made of transparent acrylic, facilitating observation of gas-liquid mixing within the device. The housing 1 has a length-width-height ratio of 1:1:1.5, with the specific dimensions determined based on the actual wastewater treatment capacity. The cover plate 2 is secured to the top of the housing 1 using sealant, ensuring it seals the top opening of the housing 1 when the device is in use. The first support plate is fixed to the inner wall of the housing 1 by heat-seal, housing the catalytic layer 31.

[0049] The catalytic layer 31 uses 2-4 mm aluminum-based spherical catalyst particles and is fully distributed on the supporting tray 3; the thickness of the catalytic layer 31 can be one-twelfth to one-quarter of the effective water depth. The specific thickness can be determined according to the fixed position of the supporting tray 3. The higher the fixed position of the supporting tray 3, the smaller the thickness of the catalytic layer 31.

[0050] The air distribution pipe 54 is made of ABS engineering plastic, and the lengths of the main pipe 541 and the branch pipe 542 are determined according to the bottom surface size of the shell 1 so that they cover the bottom surface of the shell 1; the diameters of the main pipe 541 and the branch pipe 542 are both between 20-50 mm, and the diameter of the main pipe 541 is greater than or equal to the diameter of the branch pipe 542.

[0051] In this embodiment, the wastewater retention time in the device is controlled to 1 hour by adjusting the first flowmeter 43, and the ozone dosage concentration is maintained at 100 mg / L by adjusting the second flowmeter 53. As shown in Table 1, wastewater in the outlet pipe 42 of the device is sampled every 4 hours. The wastewater before and after treatment is analyzed using the potassium dichromate oxidation method to measure changes in chemical oxygen demand (COD). This demonstrates that the device can continuously treat wastewater and that the catalytic oxidation effect is sustainable.

[0052] Table 1 Sewage treatment results

[0053]

[0054] In summary, the device of the utility model has a simple structure, is easy to build, has low construction cost, and the internal structure can be adjusted according to experimental requirements, which is convenient for the selection and verification of catalysts and the verification of sewage treatment effects in the early engineering design, and quickly provides supporting data for engineering design and application.

[0055] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. An ozone catalytic system pilot device, characterized in that: include: A catalytic unit, a liquid transmission unit, and a gas processing unit. A catalytic reaction can occur inside the catalytic unit. The liquid transmission unit is connected to both sides of the catalytic unit. The gas processing unit is connected to the top and bottom of the catalytic unit. The catalytic unit comprises: A housing, wherein a cavity for providing a catalytic reaction is provided inside the housing and an opening is provided at the top thereof for cleaning and maintenance of the catalytic unit; a cover plate, placed on the top of the housing to seal the opening; A supporting tray for supporting the catalytic layer, comprising: a first supporting plate and a gauze; the first supporting plate is fixed at one-third to one-half of the height of the outer shell, is fixed on the inner wall of the outer shell parallel to the bottom surface of the outer shell, and its size is consistent with the bottom surface of the outer shell; a plurality of first flow holes are provided on the surface of the first supporting plate; the gauze is arranged on the upper surface of the first supporting plate.

2. The ozone catalytic system pilot device according to claim 1 is characterized in that: A second support plate is further provided on the upper surface of the catalytic layer; the size of the second support plate is consistent with that of the first support plate, and a plurality of second flow holes are provided on the surface of the second support plate.

3. The ozone catalytic system pilot device according to claim 1 is characterized in that: A first through hole and a second through hole are provided at the bottom of the side wall of the shell, which are the feed port of the catalytic unit; a third through hole is provided at the top of the side wall of the shell, which is the discharge port of the catalytic unit. The height difference between the feed port and the discharge port is proportional to the residence time of the sewage in the catalytic unit.

4. The ozone catalytic system pilot device according to claim 3, characterized in that: The third through hole of the shell is arranged on the opposite side walls of the first through hole and the second through hole, and the distance between the third through hole and the top of the shell is greater than 5 cm.

5. The ozone catalytic system pilot device according to claim 3 is characterized in that: The cover plate is detachable and has a fourth through hole on its surface for discharging gas from the catalytic unit.

6. The ozone catalytic system pilot device according to claim 3 is characterized in that: The liquid transmission unit comprises: A water inlet pipe is connected to the first through hole of the housing and transmits the sewage to be treated to the catalytic unit; The first flow meter is installed on the water inlet pipe and can control the flow rate of the sewage to be treated into the catalytic unit; The water outlet pipe is connected to the third through hole of the shell to discharge the treated sewage.

7. The ozone catalytic system pilot device according to claim 5, characterized in that: The gas processing unit comprises: an air inlet pipe, connected to the second through hole of the housing, for transmitting ozone gas into the catalytic unit; A second flow meter is provided on the air inlet pipe to control the flow rate of the ozone gas entering the catalytic unit; An air distribution pipe is placed at the bottom end of the housing and includes a main pipe and several branch pipes; one end of the main pipe is connected to the air inlet pipe and the other end is sealed; the surface of the main pipe is provided with two symmetrically arranged rows of mounting holes, with the spacing between each mounting hole in each row being the same; one end of several branch pipes is connected to the main pipe via a joint so that the end of the branch pipe corresponds to the mounting hole on the main pipe, and the other end of the branch pipe is sealed; The gas outlet pipe is connected to the fourth through hole of the cover plate and discharges the ozone gas that has not participated in the reaction in the catalytic unit and the gas generated after the reaction.

8. The ozone catalytic system pilot device according to claim 7, characterized in that: A plurality of air outlet holes are evenly distributed on the surface of the branch pipe, so that the ozone gas is evenly discharged from the air distribution pipe in the form of bubbles; the aperture range of the air outlet holes is between 0.2-2 mm.

9. The ozone catalytic system pilot device according to claim 8, characterized in that: A rubber film is sleeved on the surface of the branch pipe, and a plurality of micro air vents are provided on the surface of the rubber film. The pore diameter of the micro air vents is less than 0.5 microns.

10. The ozone catalytic system pilot device according to claim 7, characterized in that: The gas treatment unit further includes: an exhaust gas processor, which is arranged on the cover plate and connected to the exhaust pipe; a temperature-rising resistance wire is provided inside the exhaust gas processor to convert unreacted ozone in the exhaust pipe into oxygen and discharge it into the atmosphere.

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