Intermittent catalytic ozonation reactor

Abstract

The utility model provides an intermittent catalytic ozonation reactor which is characterized by comprising a reactor tank body, and a tail gas exhaust port, a discharge port, a safety port, a safety valve, a pressure balance port, a pressure balance pneumatic valve and a back pressure valve are arranged at the top of the reactor tank body; a water inlet, a COD (Chemical Oxygen Demand) online monitoring device, a dendritic perforated water inlet pipe, a first flange connector, a drain outlet and a circulating water inlet are arranged above the reactor tank body; a catalyst layer is arranged in the middle of the reactor tank body; a filter plate, an ozone inlet, a dendritic ozone inlet pipe, a gas washing inlet, a dendritic perforated gas inlet pipe, a water distributor, a circulating water outlet and a second flange connector are arranged at the lower part of the reactor tank body; a manhole, a water producing port, a water draining pipe and a water producing pipe are arranged at the bottom of the reactor tank body.

Description

Technical Field

[0001] The utility model relates to an ozone catalytic oxidation reactor, more specifically, to an intermittent ozone catalytic oxidation reactor. Background Art

[0002] Ozone is widely used in the field of water treatment. It has a strong redox potential, high water solubility, and can be quickly decomposed into oxygen under normal circumstances, without causing secondary pollution. However, the single ozone direct oxidation process has weak pollutant treatment performance, so it is often used to catalyze ozone by adding a catalyst to the reactor to achieve efficient purification of pollutants.

[0003] At present, the ozone catalytic oxidation process is often carried out in water treatment projects in a continuous flow operation mode, that is, the catalyst is placed in a closed reactor, and the sewage is continuously treated by continuous water inlet and aeration. However, the design of the ozone process is generally to achieve a certain amount of pollutant removal by adjusting the operating parameters (such as residence time, ozone dosage, etc.), rather than to achieve a certain effluent water quality as the main purpose. Therefore, when the inlet water quality fluctuates greatly, it is difficult to stably maintain the expected effluent water quality. This paper aims to invent an intermittent ozone catalytic oxidation reactor, which controls the reaction time by setting the relevant parameters of the automatic control program and the COD online monitoring system, so as to stably maintain the expected effluent water quality. At the same time, the backwash program is preset to ensure that the catalyst in the reactor can perform its catalytic performance stably for a long time; in addition, by setting a back pressure valve at the top of the reactor, the reactor is in a high pressure state, thereby inhibiting the decomposition of ozone dissolved in the water and the generation of large-particle bubbles of ozone, further improving the water treatment effect. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides an intermittent ozone catalytic oxidation reactor, which adopts the following technical solutions:

[0005] An intermittent ozone catalytic oxidation reactor, characterized in that it includes a reactor tank body, wherein the top of the reactor tank body is provided with a tail gas exhaust port, a discharge port, a safety port, a safety valve, a pressure balance port, a pressure balance pneumatic valve, and a back pressure valve; the top of the reactor tank body is provided with a water inlet, a COD online monitoring device, a branch-shaped perforated water inlet pipe, a first flange connection port, a sewage outlet, and a circulating water inlet; the middle of the reactor tank body is provided with a catalytic layer; the lower part of the reactor tank body is provided with a filter plate, an ozone inlet, a branch-shaped ozone inlet pipe, an air wash inlet, a branch-shaped perforated inlet pipe, a water distributor, a circulating water outlet, and a second flange connection port; the bottom of the reactor tank body is provided with a manhole, a water production port, a drain pipe, and a water production pipe.

[0006] Furthermore, the air wash air inlet is connected to the branch-shaped perforated air inlet pipe, the ozone air inlet is connected to the branch-shaped ozone air inlet pipe, the water inlet is connected to the branch-shaped perforated water inlet pipe, and the water production port is connected to the drain pipe; a double flange liquid level transmitter is provided between the first flange connection port and the second flange connection port.

[0007] Further, the safety valve is arranged on the safety port, the pressure-balanced pneumatic valve is arranged on the pressure-balanced port, and the back-pressure valve is arranged on the tail gas exhaust port.

[0008] Furthermore, the circulating water inlets between the reactor tank bodies are connected in parallel through a circulating water inlet pipe, the circulating water outlets between the reactor tank bodies are connected in parallel through a circulating water outlet pipe, and an air dissolving pump is provided between the circulating water inlet pipe and the circulating water outlet pipe; the tail gas exhaust ports between the reactor tank bodies are connected in parallel through an exhaust pipe, and an air dissolving pipeline is provided between the exhaust pipe and the air dissolving pump.

[0009] Furthermore, the water production port is connected to the water discharge pipe, the water discharge pipes between the reactor tanks are connected in parallel through the water production pipe, and the water production pipe is also provided with a water production pump, a pressure sensor and a backwash pump.

[0010] Furthermore, there are several reactor tanks, and the specific number depends on the amount of wastewater.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] (1) The device operates in an intermittent mode, using a COD online monitoring device to monitor the wastewater quality in the reactor in real time and control the start and stop of the water production pump. Therefore, it has strong adaptability to influent COD fluctuations and can stably achieve the expected water production quality.

[0013] (2) During the aeration process, ozone tail gas is only discharged from the tail gas exhaust port. The back pressure valve is used to keep the entire reactor in a high pressure state during operation, thereby inhibiting ozone decomposition and the formation of large-size ozone bubbles, and improving ozone utilization.

[0014] (3) Use a double flange level transmitter to control the reactor liquid level during the water inlet and water production stages to prevent the liquid level from being too high during the water inlet stage and water vapor from entering the exhaust pipe, and to prevent the sewage in the reactor from being completely discharged, causing the water production pump to run idle. At the same time, the bottom of the reactor can always maintain a certain water depth to prevent ozone gas in the reactor from flowing out with the outlet water and affecting the operating environment.

[0015] (4) A pressure sensor is installed at the water inlet of the water production pump, which can monitor the blockage of the reactor catalyst layer in real time according to the pressure change, so as to control the backwashing of the reactor in real time through the automatic control program, avoid ineffective cleaning and reduce operating energy consumption.

[0016] (5) The entire set of reactors is composed of multiple sets of reactors connected in parallel. In actual projects, the number of reactors can be increased according to the amount of water, thereby increasing the amount of water treated, which has high flexibility.

[0017] (6) A safety valve is installed on the top of the reactor to prevent the reactor from experiencing high pressure hazards due to problems with the exhaust gas pipeline during operation, which provides strong safety.

[0018] (7) The exhaust pipe is connected to the air inlet of the dissolved air pump, the circulating water inlet pipe is connected to the water outlet of the dissolved air pump, and the circulating water outlet pipe is connected to the water inlet of the dissolved air pump. On the one hand, the dissolved air pump increases the contact frequency between pollutants and ozone and catalysts through the circulation action, thereby improving the removal effect of pollutants. On the other hand, it dissolves the ozone tail gas in the sewage in the dissolved air pump and circulates it to the reactor, further improving the utilization rate of ozone. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Among them, 1-reactor tank, 2-water inlet, 3-COD online monitoring device, 4-sewage outlet, 5-catalytic layer, 6-first flange connection port, 7-second flange connection port, 8-double flange liquid level transmitter, 9-water outlet, 10-drain pipe, 11-water production pipe, 12-manhole, 13-air washing air inlet, 14-branched perforated air inlet pipe, 15-ozone air inlet, 16-branched ozone air inlet pipe, 17-ozone aeration disk, 18-water distributor, 19-filter plate , 20-branched perforated water inlet pipe, 21 pressure balance port, 22 safety port, 23-safety valve, 24-discharge port, 25-exhaust exhaust port, 26-back pressure valve, 27-exhaust pipe, 28-pressure sensor, 29-water production pump, 30-backwash pump, 31-pressure balance pneumatic valve, 32-circulating water inlet pipe, 33-circulating water inlet, 34-dissolved air pump, 35-circulating water outlet, 36-circulating water outlet pipe, 37-dissolved air pipeline, 38-exhaust gas destroyer. DETAILED DESCRIPTION

[0021] The utility model is further elaborated and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1As shown, the utility model provides an intermittent ozone catalytic oxidation reactor, characterized in that it includes a reactor tank body 1, the top of the reactor tank body 1 is provided with a tail gas exhaust port 25, a discharge port 24, a safety port 22, a safety valve 23, a pressure balance port 21, a pressure balance pneumatic valve 31, and a back pressure valve 26; the reactor tank body 1 is provided with a water inlet 2, a COD online monitoring device 3, a branch-shaped perforated water inlet pipe 20, a first flange connection port 6, a sewage outlet 4, and a circulating water inlet 33; the middle of the reactor tank body 1 is provided with a catalytic layer 5; the lower part of the reactor tank body 1 is provided with a filter plate 19, an ozone inlet 15, a branch-shaped ozone inlet pipe 16, an air washing inlet 13, a branch-shaped perforated inlet pipe 14, a water distributor 18, a circulating water outlet 35, and a second flange connection port 7; the bottom of the reactor tank body 1 is provided with a manhole 12, a water production port 9, a drain pipe 10, and a water production pipe 11.

[0023] The air wash air inlet 13 is connected to the branch-shaped perforated air inlet pipe 14, the ozone air inlet 15 is connected to the branch-shaped ozone air inlet pipe 16, the water inlet 2 is connected to the branch-shaped perforated water inlet pipe 20, and the water production port 9 is connected to the drain pipe 10; a double flange liquid level transmitter 8 is provided between the first flange connection port 6 and the second flange connection port 7.

[0024] The safety valve 23 is disposed on the safety port 22 , the pressure-balanced pneumatic valve 31 is disposed on the pressure-balanced port 21 , and the back-pressure valve 26 is disposed on the exhaust port 25 .

[0025] The circulating water inlets 33 between the reactor tank bodies 1 are connected in parallel through a circulating water inlet pipe 32, and the circulating water outlets 35 between the reactor tank bodies 1 are connected in parallel through a circulating water outlet pipe 36, and an air dissolving pump 34 is provided between the circulating water inlet pipe 32 and the circulating water outlet pipe 36; the tail gas exhaust ports 25 between the reactor tank bodies 1 are connected in parallel through an exhaust pipe 27, and an air dissolving pipeline 37 is provided between the exhaust pipe 27 and the air dissolving pump 34.

[0026] The water production port 9 is connected to the water discharge pipe 10 , and the water discharge pipes 10 between the reactor tanks 1 are connected in parallel through the water production pipe 11 . The water production pipe 11 is also provided with a water production pump 29 , a pressure sensor 28 and a backwash pump 30 .

[0027] There are several reactor tanks 1, and the specific number depends on the amount of wastewater.

[0028] The system's processing flow is as follows:

[0029] During the water production phase of the reactor startup, the pressure-balanced pneumatic valve 31 is opened, and the water inlet pump is started to start water inletting into the reactor tank 1. The water is evenly distributed in the reactor tank 1 through the branch-shaped perforated water inlet pipe 20 from the water inlet 2. The elevation of the first flange connection port 6 is the design water level of the reactor tank 1. When the water level monitored by the double flange liquid level transmitter 8 reaches the design water level, the water inlet is stopped. The tail gas destroyer 38 is opened, and ozone aeration is started. Ozone is aerated from the ozone inlet 15 through the branch-shaped ozone inlet pipe 16 through the ozone aeration plate 17. A part of the ozone is dissolved in the water, and the catalytic layer 5 generates hydroxyl radicals (·OH) to achieve advanced oxidation. A part of the tail gas is finally entered into the tail gas destroyer 38 through the tail gas exhaust port 25 through the back pressure valve 26 and the exhaust pipe 27.

[0030] The presence of the back pressure valve 26 can maintain a high-pressure environment for the entire reactor tank body 1, which has the effect of promoting ozone dissolution, inhibiting ozone decomposition and the formation of large-size bubbles. During the reaction process, the dissolved air pump 34 is started, and the wastewater from the reactor tank body 1 enters the dissolved air pump 34 through the circulating outlet pipe 36. The ozone tail gas in the exhaust pipe 27 is mixed with the wastewater through the dissolved air pump 34 and enters the reactor tank body 1 through the circulating inlet pipe 32. During the reaction process, the COD online monitoring device 3 can monitor the COD changes in the reactor in real time. When the COD in the reactor tank body 1 is reduced to the design requirement value, water production begins, and the relevant valves of the water production pipe 11 are opened. The water level decreases under the suction of the water production pump 29 and the gravity of the water in the reactor tank body 1. When the water level drops to the second flange connection port 7, water production ends, and the water production pump 29 and the dissolved air pump 34 are turned off. Since the bottom of the reactor tank body 1 is in a water-sealed state for a long time, it can effectively prevent ozone tail gas from flowing out of the reactor with the effluent water during the water production process, thereby polluting the environment. When the water production ends, water can be added again to start the second cycle of water production.

[0031] A pressure sensor 28 is installed at the water inlet position of the water production pump 29. When the pressure reading of the pressure sensor 28 is too low during operation, it means that the catalyst layer 5 is seriously blocked and needs to be unblocked by backwashing. At this time, the water production pump 29 is turned off, and the backwash pump 30 and the pressure balance pneumatic valve 31 are turned on. The treated clean water enters the reactor tank body 1 under the suction action of the backwash pump 30 and is evenly distributed under the action of the water distributor 18. At the same time, the air washing inlet 13 and the branch-shaped perforated air inlet pipe 14 enter the reactor tank body 1 and are evenly distributed under the action of the water distributor 18. The catalyst layer 5 is unblocked under the synergistic action of air washing and water washing, and the large particle suspended matter that causes the catalyst layer 5 to be blocked flows out of the reactor tank body 1 through the sewage outlet 4.

[0032] A safety valve 23 is installed on the top of the reactor tank 1. Since the reactor tank 1 is a high-pressure closed container, when the pressure is too high during the reaction process, the safety valve 23 opens to release the gas in the reactor to avoid danger caused by excessive pressure.

[0033] The reactor tank 1 can be multiple groups, the purpose of which is to increase the water production. In practice, the number of reactors can be adjusted according to engineering needs.

[0034] The utility model controls the reaction time by setting the relevant parameters of the automatic control program and the COD online monitoring system, thereby stably maintaining the expected effluent water quality, and at the same time presetting the backwash program to ensure that the catalyst in the reactor can exert the catalytic performance stably for a long time. In addition, by setting a back pressure valve on the top of the reactor, the reactor is in a high pressure state, thereby inhibiting the decomposition of ozone dissolved in the water and the generation of large-particle ozone bubbles, further improving the water treatment effect. And the ozone exhaust pipe is connected to the dissolved air pump, and the utilization rate of ozone is further improved by dissolving the ozone tail gas with the water in the reactor under high pressure. Example

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0036] A batch ozone catalytic oxidation reactor was trial-produced using the above technical solution. Figure 1 As shown, the treatment object is chemical nickel raw water from a certain electroplating wastewater treatment plant.

[0037] The system includes a reactor tank 1, a water inlet 2, a COD online monitoring device 3, a sewage outlet 4, a catalyst layer 5, a first flange connection port 6, a second flange connection port 7, a double flange liquid level transmitter 8, a water production port 9, a drain pipe 10, a water production pipe 11, a manhole 12, an air wash air inlet 13, a branch-shaped perforated air inlet pipe 14, an ozone air inlet 15, a branch-shaped ozone air inlet pipe 16, an ozone aeration plate 17, a water distributor 18, and a filter plate 1 9. Branch-shaped perforated water inlet pipe 20, pressure balance port 21, safety port 22, safety valve 23, discharge port 24, tail gas exhaust port 25, back pressure valve 26, exhaust pipe 27, pressure sensor 28, water production pump 29, backwash pump 30, pressure balance pneumatic valve 31, circulating water inlet pipe 32, circulating water inlet 33, dissolved air pump 34, circulating water outlet 35, circulating water outlet pipe 36, dissolved air pipeline 37, tail gas destroyer 38.

[0038] The system comprises a reactor tank body 1, wherein a tail gas exhaust port 25, a discharge port 24, a safety port 22, a safety valve 23, a pressure balance port 21, a pressure balance pneumatic valve 31 and a back pressure valve 26 are arranged on the top of the reactor tank body 1; a water inlet 2, a COD online monitoring device 3, a branch-shaped perforated water inlet pipe 20, a first flange connection port 6, a sewage outlet 4 and a circulating water inlet 33 are arranged above the reactor tank body 1; a catalytic layer 5 is arranged in the middle of the reactor tank body 1; a filter plate 19, an ozone inlet 15, a branch-shaped ozone inlet pipe 16, an air washing inlet 13, a branch-shaped perforated inlet pipe 14, a water distributor 18, a circulating water outlet 35 and a second flange connection port 7 are arranged at the bottom of the reactor tank body 1; a manhole 12, a water production port 9, a drain pipe 10 and a water production pipe 11 are arranged at the bottom of the reactor tank body 1.

[0039] The air wash air inlet 13 is connected to the branch-shaped perforated air inlet pipe 14, the ozone air inlet 15 is connected to the branch-shaped ozone air inlet pipe 16, the water inlet 2 is connected to the branch-shaped perforated water inlet pipe 20, and the water production port 9 is connected to the drain pipe 10; a double flange liquid level transmitter 8 is provided between the first flange connection port 6 and the second flange connection port 7.

[0040] The safety valve 23 is disposed on the safety port 22 , the pressure-balanced pneumatic valve 31 is disposed on the pressure-balanced port 21 , and the back-pressure valve 26 is disposed on the exhaust port 25 .

[0041] The circulating water inlets 33 between the reactor tank bodies 1 are connected in parallel through a circulating water inlet pipe 32, and the circulating water outlets 35 between the reactor tank bodies 1 are connected in parallel through a circulating water outlet pipe 36, and an air dissolving pump 34 is provided between the circulating water inlet pipe 32 and the circulating water outlet pipe 36; the tail gas exhaust ports 25 between the reactor tank bodies 1 are connected in parallel through an exhaust pipe 27, and an air dissolving pipeline 37 is provided between the exhaust pipe 27 and the air dissolving pump 34.

[0042] The water production port 9 is connected to the water discharge pipe 10 , and the water discharge pipes 10 between the reactor tanks 1 are connected in parallel through the water production pipe 11 . The water production pipe 11 is also provided with a water production pump 29 , a pressure sensor 28 and a backwash pump 30 .

[0043] There are several reactor tanks 1, and the specific number depends on the amount of wastewater.

[0044] This reactor was used to treat chemical nickel raw water from an electroplating wastewater treatment plant. Continuous ozone aeration was carried out for 15 hours. The pilot system treated 100L of water and the raw water COD was 391.6mg / L. After the system operation was stable, the effluent COD dropped to 7.6mg / L, which met the Class I water requirements of the "Surface Water Environmental Quality Standard" (GB3838-2020). This shows that the system has a good treatment effect on difficult-to-degrade organic matter. In engineering, the effluent COD can be set according to actual needs to maintain stable effluent water quality.

[0045] The above-described embodiments are only used to illustrate one implementation method of the utility model, rather than to limit it. It should be pointed out that a person skilled in the art may modify the technical solutions described in the above-described embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by a person skilled in the art without making creative efforts are within the protection scope of the utility model.

Claims

1. An intermittent ozone catalytic oxidation reactor, characterized in that: The invention comprises a reactor tank (1), wherein the top of the reactor tank (1) is provided with an exhaust port (25), a discharge port (24), a safety port (22), a safety valve (23), a pressure balance port (21), a pressure balance pneumatic valve (31), and a back pressure valve (26); the top of the reactor tank (1) is provided with a water inlet (2), a COD online monitoring device (3), a branch-shaped perforated water inlet pipe (20), a first flange connection port (6), a sewage outlet (4), a circulating water inlet (33 The reactor tank body (1) is provided with a catalytic layer (5) in the middle; the reactor tank body (1) is provided with a filter plate (19), an ozone air inlet (15), a branch-shaped ozone air inlet pipe (16), an air wash air inlet (13), a branch-shaped perforated air inlet pipe (14), a water distributor (18), a circulating water outlet (35), and a second flange connection port (7) at the lower part; the reactor tank body (1) is provided with a manhole (12), a water production port (9), a water discharge pipe (10), and a water production pipe (11) at the bottom.

2. An intermittent ozone catalytic oxidation reactor according to claim 1, characterized in that: The air wash air inlet (13) is connected to the branch-shaped perforated air inlet pipe (14), the ozone air inlet (15) is connected to the branch-shaped ozone air inlet pipe (16), the water inlet (2) is connected to the branch-shaped perforated water inlet pipe (20), and the water production port (9) is connected to the drain pipe (10); a double flange liquid level transmitter (8) is provided between the first flange connection port (6) and the second flange connection port (7).

3. The intermittent ozone catalytic oxidation reactor according to claim 1, characterized in that: The safety valve (23) is arranged on the safety port (22), the pressure-balancing pneumatic valve (31) is arranged on the pressure-balancing port (21), and the back-pressure valve (26) is arranged on the exhaust port (25).

4. The intermittent ozone catalytic oxidation reactor according to claim 1, characterized in that: The circulating water inlets (33) between the reactor tank bodies (1) are connected in parallel via a circulating water inlet pipe (32); the circulating water outlets (35) between the reactor tank bodies (1) are connected in parallel via a circulating water outlet pipe (36); an air dissolving pump (34) is provided between the circulating water inlet pipe (32) and the circulating water outlet pipe (36); the tail gas exhaust ports (25) between the reactor tank bodies (1) are connected in parallel via an exhaust pipe (27); an air dissolving pipeline (37) is provided between the exhaust pipe (27) and the air dissolving pump (34).

5. The intermittent ozone catalytic oxidation reactor according to claim 1, characterized in that: The water production port (9) is connected to the water discharge pipe (10), and the water discharge pipes (10) between the reactor tank bodies (1) are connected in parallel via a water production pipe (11). The water production pipe (11) is also provided with a water production pump (29), a pressure sensor (28) and a backwash pump (30).

6. The intermittent ozone catalytic oxidation reactor according to claim 1, characterized in that: There are a plurality of reactor tanks (1), the specific number of which depends on the amount of wastewater.

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