Internal and external nested catalytic ozonation tower for sewage treatment

Abstract

The utility model discloses an internal and external nested catalytic ozonation tower for sewage treatment. The internal and external nested catalytic ozonation tower comprises an inner cylinder body serving as a first reaction zone and an outer cylinder body which is sleeved outside the inner cylinder body and serves as a second reaction zone, a supporting layer and a catalyst filling layer are arranged in the first reaction zone and the second reaction zone close to the bottom from bottom to top; the first reaction zone and the second reaction zone are respectively connected with a circulating water system with an ejector; a first circulating water outlet is formed in the position, above the corresponding catalyst filling layer, of the first reaction area; a second circulating water outlet is formed in the position, above the corresponding catalyst filling layer, of the second reaction region; each jet device forms negative pressure in the corresponding circulating water system so as to suck ozone, and the ozone and the corresponding circulating sewage are mixed and then reinjected into the first reaction zone or the second reaction zone. The device disclosed by the utility model realizes segmented feeding of ozone and staged treatment of sewage, and has higher treatment efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment construction, in particular to an inner-outer nested ozone catalytic oxidation tower for sewage treatment. Background Art

[0002] Industrial wastewater has the characteristics of many types of pollutants, high concentration, high toxicity, complex composition and poor biodegradability. It is one of the most difficult types of wastewater to treat.

[0003] In the existing technology, the main methods for treating this type of wastewater include membrane filtration technology, ozone oxidation technology, photocatalytic oxidation technology, Fenton reagent oxidation technology, conventional micro-electrolysis technology, etc.

[0004] Ozone catalytic oxidation technology, as a type of ozone oxidation technology, is widely used in industrial wastewater treatment (especially deep treatment).

[0005] Industrial wastewater has a relatively small treatment volume, and currently it is mainly treated by catalytic oxidation towers. For many difficult-to-treat industrial wastewaters, in order to further increase the treatment effect, multiple towers are often connected in series to treat the industrial wastewater. Common forms include three towers in series and six towers in series.

[0006] On the one hand, multi-stage series connection is conducive to the segmented addition of ozone, which improves the utilization rate of ozone and enhances the treatment effect;

[0007] On the other hand, different catalysts can be filled in different towers to more specifically treat some special pollutants in industrial wastewater; and other oxidants, such as hydrogen peroxide, can be added in different towers to achieve the combined use of related processes.

[0008] In practical applications, when ozone catalytic oxidation process is used to treat industrial wastewater, multiple ozone catalytic oxidation towers are often connected in series. However, when multiple towers are connected in series, the floor space is relatively large, the construction cost is relatively high, there are also many flow pipes and valves between the towers, and the operation is complicated.

[0009] Therefore, how to achieve efficient treatment of industrial wastewater and reduce the construction cost of sewage treatment equipment has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0010] In view of the above-mentioned defects of the prior art, the utility model provides an inner and outer nested ozone catalytic oxidation tower for sewage treatment, the purpose of which is to achieve efficient treatment of industrial wastewater and reduce the construction cost of sewage treatment equipment.

[0011] To achieve the above object, the utility model discloses an inner-outer nested ozone catalytic oxidation tower for sewage treatment, comprising a columnar inner cylinder as a first reaction zone and an annular outer cylinder sleeved outside the inner cylinder as a second reaction zone.

[0012] Wherein, the first reaction zone and the second reaction zone are both reaction zones for ozone catalytic oxidation of wastewater, and a supporting layer is provided near the bottom of each zone, a catalyst filling layer is provided on the supporting layer, and an inner cylinder water collecting device and an outer cylinder water collecting device are provided near the top of each zone;

[0013] The outer wall of the inner cylinder near the bottom is provided with a water inlet;

[0014] The outer cylinder is provided with a water outlet near the top;

[0015] A flow guide pipe is provided between the inner cylinder water collecting device of the inner cylinder and the outer cylinder near the bottom, and the inner cylinder and the outer cylinder are connected through the flow guide pipe;

[0016] The inner cylinder and the outer cylinder are respectively connected to a circulating water system with an ejector;

[0017] The side wall of the inner cylinder located above the corresponding catalyst filling layer is provided with a first circulating water outlet, and the side wall near the bottom is provided with a first circulating water inlet, which is connected to the corresponding circulating water system through the first circulating water outlet and the first circulating water inlet;

[0018] The side wall of the outer cylinder located above the corresponding catalyst filling layer is provided with a second circulating water outlet, and the side wall near the bottom is provided with a second circulating water inlet, which is connected to the corresponding circulating water system through the second circulating water outlet and the second circulating water inlet;

[0019] Each ejector forms negative pressure in the corresponding circulating water system to absorb ozone, and then mixes the ozone with the corresponding circulating sewage and injects it back into the inner cylinder or the outer cylinder.

[0020] Preferably, the two catalyst filling layers in the first reaction zone and the second reaction zone are filled with different catalysts.

[0021] Preferably, the first reaction zone is provided with a first clean water inlet near the bottom and a first clean water outlet near the top, and clean water is input from the first clean water inlet and then output from the first clean water outlet to flush the first reaction zone and remove the trapped particles and suspended matter;

[0022] The second reaction zone is provided with a second clean water inlet near the bottom and a second clean water outlet near the top. Clean water is input from the second clean water inlet and output from the second clean water outlet to flush the second reaction zone and remove trapped particulate matter and suspended matter.

[0023] Preferably, a first backwash air inlet is provided near the bottom of the first reaction zone, and the particulate matter and suspended matter trapped in the support layer and the catalyst filling layer inside the first reaction zone are flushed by the pressurized air flow input from the first backwash air inlet;

[0024] A second backwash air inlet is provided near the bottom of the second reaction zone, and the particulate matter and suspended matter trapped in the supporting layer and the catalyst filling layer inside the second reaction zone are flushed by the pressurized air flow input from the second backwash air inlet.

[0025] Preferably, the first reaction zone and the second reaction zone are respectively provided with a first vent and a second vent near the bottom, and the internal sewage can be emptied by opening the corresponding first vent or the corresponding second vent.

[0026] Preferably, the first reaction zone and the second reaction zone are respectively provided with a first unloading port and a second unloading port near the upper position of the corresponding supporting layer, and the filling material of the corresponding supporting layer and the corresponding catalyst filling layer can be unloaded by opening the corresponding first unloading port or the corresponding second unloading port.

[0027] Preferably, a first lower inspection port is provided on the side wall of the first reaction zone near the bottom;

[0028] The second reaction zone is provided with a second lower inspection opening on the side wall near the bottom, and a second upper inspection opening on the side wall near the top;

[0029] The top of the inner cylinder is provided with a top inspection port connected to the first reaction zone;

[0030] A user can enter the corresponding area inside the inner cylinder through the first lower inspection port or the top inspection port;

[0031] A user can enter the corresponding area inside the outer cylinder through the second lower inspection opening or the second upper inspection opening.

[0032] Preferably, a breathing valve is provided on the top of the outer cylinder.

[0033] Preferably, an exhaust port is provided on the top of the outer cylinder, and an exhaust gas destruction device is connected through the exhaust port;

[0034] The tail gas destruction device is used to destroy the unreacted ozone-containing gas.

[0035] Beneficial effects of the utility model:

[0036] The utility model realizes segmented ozone addition and graded sewage treatment, and two-stage reaction zones can be filled with different catalysts to further improve the treatment effect, thus having higher treatment efficiency.

[0037] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the longitudinal cross-section structure of an embodiment of the utility model is shown.

[0039] Figure 2 A structural schematic diagram of one side of an embodiment of the utility model is shown.

[0040] Figure 3 A structural schematic diagram of another side of an embodiment of the utility model is shown.

[0041] Figure 4 A schematic structural diagram of the top of an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0042] Example

[0043] like Figures 1 to 4 As shown, the inner-outer nested ozone catalytic oxidation tower for sewage treatment includes a columnar inner cylinder b as a first reaction zone and an annular outer cylinder a sleeved outside the inner cylinder b as a second reaction zone.

[0044] Among them, the first reaction zone and the second reaction zone are both reaction zones for ozone catalytic oxidation of sewage, and a supporting layer c is provided near the bottom inside, a catalyst filling layer d is provided on the supporting layer c, and an inner cylinder water collecting device e and an outer cylinder water collecting device g are provided near the top respectively;

[0045] The outer wall of the inner cylinder b near the bottom is provided with a water inlet N1;

[0046] A water outlet N2 is provided near the top of the outer cylinder a;

[0047] A flow guide pipe f is provided between the inner cylinder water collecting device e of the inner cylinder b and the outer cylinder a near the bottom, and the inner cylinder b and the outer cylinder a are connected through the flow guide pipe f;

[0048] The inner cylinder b and the outer cylinder a are respectively connected to a circulating water system with an ejector;

[0049] The side wall of the inner cylinder b located above the corresponding catalyst filling layer d is provided with a first circulating water outlet N11, and the side wall near the bottom is provided with a first circulating water inlet N12, which is connected to the corresponding circulating water system through the first circulating water outlet N11 and the first circulating water inlet N12;

[0050] The side wall of the outer cylinder a located above the corresponding catalyst filling layer d is provided with a second circulating water outlet N9, and the side wall near the bottom is provided with a second circulating water inlet N10, which is connected to the corresponding circulating water system through the second circulating water outlet N9 and the second circulating water inlet N10;

[0051] Each ejector forms negative pressure in the corresponding circulating water system to absorb ozone, and then mixes the ozone with the corresponding circulating sewage and injects it back into the inner cylinder b or the outer cylinder a.

[0052] The first reaction zone and the second reaction zone of the utility model both form negative pressure through the ejector in the corresponding circulating water system to suck in and mix ozone with the corresponding circulating sewage and then inject it back to form a "jet" to add ozone.

[0053] The utility model uses an inner cylinder b and an annular outer cylinder a sleeved outside the inner cylinder b as the first reaction zone and the second reaction zone to form an inner and outer two-stage reaction zone, thereby realizing segmented addition of ozone and graded treatment of sewage. The sewage passes through the right reaction zone and enters the left reaction zone to realize graded treatment and improve treatment efficiency.

[0054] During specific implementation: sewage enters the first reaction zone from the water inlet N1;

[0055] In the first reaction zone, the sewage enters the corresponding circulating water system from the first circulating water outlet N11, and then passes through the corresponding ejector to be mixed with ozone, and then returns to the first reaction zone from the first circulating water inlet N12; in this process, the ejector simultaneously inhales ozone gas, and after the sewage mixed with ozone returns to the first reaction zone from the first circulating water inlet N12, it flows through the supporting layer c and the catalyst filling layer d in turn, contacts with the catalyst in the catalyst filling layer d, and undergoes a catalytic degradation reaction, and as the cycle continues, ozone is continuously dissolved and reacts.

[0056] The wastewater after the reaction in the first reaction zone passes through the draft pipe f and enters the bottom of the second reaction zone;

[0057] In the second reaction zone, the sewage enters the corresponding circulating water system from the second circulating water outlet N9, then passes through the corresponding ejector to be mixed with ozone, and then returns to the second reaction zone from the second circulating water inlet N10; in this process, the ejector simultaneously inhales ozone gas, and after the sewage mixed with ozone returns to the second reaction zone from the second circulating water inlet N10, it flows through the supporting layer c and the catalyst filling layer d in turn, contacts with the catalyst in the catalyst filling layer d, and a catalytic degradation reaction occurs. As the cycle continues, ozone is continuously dissolved and reacts, and the wastewater after the reaction flows out from the outlet N2 and enters the subsequent system unit.

[0058] The sewage enters the first reaction zone through the water inlet N1, then passes through the supporting layer c and the catalyst filling layer d, and is finally collected by the water collecting device e and introduced into the second reaction zone by the guide pipe f. The sewage enters and exits the first reaction zone and the second reaction zone in a "bottom-in and top-out" manner, which is beneficial for the sewage mixed with ozone to flow through the catalyst in sequence, achieve full contact with the catalyst, and realize the catalytic effect; in addition, bottom-in and top-out are beneficial to full mixing, reduce short-flow, and are easy to operate and control.

[0059] After the final sewage is treated, it enters the subsequent treatment unit. The first reaction zone and the second reaction zone are two independent reaction zones.

[0060] In certain embodiments, the two catalyst filling layers d of the first reaction zone and the second reaction zone are filled with different catalysts.

[0061] The two catalyst filling layers d of the first reaction zone and the second reaction zone are filled with different catalysts, which can further improve the treatment effect and thus have a higher treatment efficiency.

[0062] In some embodiments, the first reaction zone is provided with a first clean water inlet N5 near the bottom and a first clean water outlet N6 near the top, and clean water is input from the first clean water inlet N5 and then output from the first clean water outlet N6 to flush the first reaction zone and remove the trapped particles and suspended matter;

[0063] A second clean water inlet N3 is provided near the bottom of the second reaction zone, and a second clean water outlet N4 is provided near the top. Clean water is input from the second clean water inlet N3 and output from the second clean water outlet N4 to flush the second reaction zone and remove trapped particulate matter and suspended matter.

[0064] In some embodiments, a first backwash air inlet N8 is provided near the bottom of the first reaction zone, and the particulate matter and suspended matter trapped in the support layer c and the catalyst filling layer d inside the first reaction zone are flushed by the pressurized air flow input from the first backwash air inlet N8;

[0065] A second backwash air inlet N7 is provided near the bottom of the second reaction zone, and the particulate matter and suspended matter trapped in the supporting layer c and the catalyst filling layer d inside the second reaction zone are flushed by the pressurized air flow input from the second backwash air inlet N7.

[0066] In practical applications, the utility model performs "air backwashing" and "water backwashing" to prevent possible blockage caused by suspended matter, thereby avoiding blockage.

[0067] In certain embodiments, the first reaction zone and the second reaction zone are respectively provided with a first vent N16 and a second vent N15 near the bottom, and the internal sewage can be emptied by opening the corresponding first vent N16 or the corresponding second vent N15.

[0068] In some embodiments, the first reaction zone and the second reaction zone are respectively provided with a first unloading port N18 and a second unloading port N17 near the upper position of the corresponding supporting layer c. The filling material of the corresponding supporting layer c and the corresponding catalyst filling layer d can be unloaded by opening the corresponding first unloading port N18 or the corresponding second unloading port N17.

[0069] In certain embodiments, a first lower inspection port N20 is provided on the side wall of the first reaction zone near the bottom;

[0070] A second lower inspection port N19 is provided on the side wall near the bottom of the second reaction zone, and a second upper inspection port N21 is provided on the side wall near the top;

[0071] A top inspection port N22 connected to the first reaction zone is provided at the top of the inner cylinder b;

[0072] The user can enter the corresponding area inside the inner cylinder b through the first lower inspection port N20 or the top inspection port N22;

[0073] The user can enter the corresponding area inside the outer cylinder a through the second lower inspection port N19 or the second upper inspection port N21.

[0074] The first lower inspection port N20, the top inspection port N22, the second lower inspection port N19 and the second upper inspection port N21 can facilitate access to the inner cylinder b or the outer cylinder a for equipment maintenance.

[0075] In some embodiments, a breathing valve N13 is provided at the top of the outer cylinder a.

[0076] The breathing valve N13 ensures that the pressure inside the container does not become too high.

[0077] In some embodiments, an exhaust port N14 is provided at the top of the outer cylinder a, and the exhaust gas destruction device is connected through the exhaust port N14;

[0078] The tail gas destruction device is used to destroy the unreacted ozone-containing gas.

[0079] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An internal and external nested ozone catalytic oxidation tower for sewage treatment; characterized in that: It comprises a columnar inner cylinder (b) serving as a first reaction zone and an annular outer cylinder (a) sleeved outside the inner cylinder (b) serving as a second reaction zone; The first reaction zone and the second reaction zone are both reaction zones for ozone catalytic oxidation of wastewater, and a supporting layer (c) is provided near the bottom of each reaction zone, a catalyst filling layer (d) is provided on the supporting layer (c), and an inner cylinder water collecting device (e) and an outer cylinder water collecting device (g) are provided near the top of each reaction zone; The outer wall of the inner cylinder (b) near the bottom is provided with a water inlet (N1); The outer cylinder (a) is provided with a water outlet (N2) near the top; A flow guide pipe (f) is provided between the inner cylinder water collecting device (e) of the inner cylinder (b) and the outer cylinder (a) near the bottom, and the inner cylinder (b) and the outer cylinder (a) are connected via the flow guide pipe (f); The inner cylinder (b) and the outer cylinder (a) are respectively connected to a circulating water system with an ejector; The side wall of the inner cylinder (b) located above the corresponding catalyst filling layer (d) is provided with a first circulating water outlet (N11), and the side wall near the bottom is provided with a first circulating water inlet (N12), and the first circulating water outlet (N11) and the first circulating water inlet (N12) are connected to the corresponding circulating water system; The side wall of the outer cylinder (a) located above the corresponding catalyst filling layer (d) is provided with a second circulating water outlet (N9), and the side wall near the bottom is provided with a second circulating water inlet (N10), and the second circulating water outlet (N9) and the second circulating water inlet (N10) are connected to the corresponding circulating water system; Each ejector forms negative pressure in the corresponding circulating water system to absorb ozone, and then mixes the ozone with the corresponding circulating sewage and injects it back into the inner cylinder (b) or the outer cylinder (a).

2. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: The two catalyst-filled layers (d) of the first reaction zone and the second reaction zone are filled with different catalysts.

3. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: The first reaction zone is provided with a first clean water inlet (N5) near the bottom and a first clean water outlet (N6) near the top. Clean water is input from the first clean water inlet (N5) and then output from the first clean water outlet (N6) to flush the first reaction zone and remove trapped particles and suspended matter. The second reaction zone is provided with a second clean water inlet (N3) near the bottom and a second clean water outlet (N4) near the top. Clean water is input from the second clean water inlet (N3) and then output from the second clean water outlet (N4) to flush the second reaction zone and remove trapped particulate matter and suspended matter.

4. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: A first backwash air inlet (N8) is provided near the bottom of the first reaction zone, and the particulate matter and suspended matter trapped in the support layer (c) and the catalyst filling layer (d) inside the first reaction zone are flushed by the pressurized air flow input from the first backwash air inlet (N8); A second backwash air inlet (N7) is provided near the bottom of the second reaction zone, and the particulate matter and suspended matter trapped in the supporting layer (c) and the catalyst filling layer (d) inside the second reaction zone are flushed by the pressurized air flow input from the second backwash air inlet (N7).

5. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: The first reaction zone and the second reaction zone are respectively provided with a first vent (N16) and a second vent (N15) near the bottom, and the internal sewage can be emptied by opening the corresponding first vent (N16) or the corresponding second vent (N15).

6. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: The first reaction zone and the second reaction zone are respectively provided with a first unloading port (N18) and a second unloading port (N17) near the upper position of the corresponding supporting layer (c). The filling material of the corresponding supporting layer (c) and the corresponding catalyst filling layer (d) can be unloaded by opening the corresponding first unloading port (N18) or the corresponding second unloading port (N17).

7. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: A first lower inspection port (N20) is provided on the side wall of the first reaction zone near the bottom; The second reaction zone is provided with a second lower inspection port (N19) on the side wall near the bottom, and a second upper inspection port (N21) on the side wall near the top; The top of the inner cylinder (b) is provided with a top inspection port (N22) connected to the first reaction zone; A user can enter the corresponding area inside the inner cylinder (b) through the first lower inspection port (N20) or the top inspection port (N22); A user can enter the corresponding area inside the outer cylinder (a) through the second lower inspection opening (N19) or the second upper inspection opening (N21).

8. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: A breathing valve (N13) is provided on the top of the outer cylinder (a).

9. The inner-outer nested ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that: The top of the outer cylinder (a) is provided with an exhaust port (N14), and the exhaust gas destruction device is connected through the exhaust port (N14); The tail gas destruction device is used to destroy the unreacted ozone-containing gas.

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