Catalytic ozonation device applied to PLC (programmable logic controller) for automatically controlling ozone dosage

Abstract

The utility model relates to a catalytic ozonation device applied to PLC automatic control ozone dosage, which comprises an alkali liquor supply unit, an ozone supply unit, a catalytic ozonation unit, a temperature adjusting unit and a detection unit, the detection unit comprises a flowmeter, a pH detector, a COD detector and a thermometer, the flow meter is used for detecting the flow of raw water entering the catalytic ozonation unit, the pH detector is used for detecting the pH value of reaction liquid in the catalytic ozonation unit, the COD detector is used for detecting the COD concentration value of the raw water and the COD concentration value of effluent after the catalytic ozonation reaction, and the thermometer is used for detecting the temperature of the reaction liquid in the catalytic ozonation unit. The detection unit obtains the reaction condition of the catalytic ozonation reaction unit and feeds back the reaction condition to the PLC to control the dosage of ozone, so that the problems that raw water cannot meet the standard requirement after being treated due to too small dosage of ozone and ozone is wasted due to too large dosage of ozone are solved, the utilization efficiency of ozone is effectively improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment devices, in particular to an ozone catalytic oxidation device applied to PLC automatic control of ozone dosage. Background Art

[0002] Ozone has extremely strong oxidizing property. Compared with ozone as a single oxidant, the hydroxyl radicals (·OH) formed by ozone under the action of a catalyst have a higher reaction rate and stronger oxidizing property with sewage organic matter, and can oxidize almost all organic matters.

[0003] The equipment, operation and maintenance costs of existing ozone catalytic oxidation systems are relatively high. It takes 25 kWh of electricity to prepare 1 kg of ozone with a concentration of 80%, and only about 1 kg of COD can be oxidized and decomposed. In some sewage treatment projects with limited budgets, when the ozone catalytic oxidation process is required to meet the water quality indicators due to process requirements, in order to compress costs, imperfect system equipment is adopted. After the system operates for a certain period of time, the associated facilities of the system cannot be mutually inspected and linked, resulting in an increase in the working conditions difference between the front and rear stages, a decline in the overall efficiency of the system, greater operation difficulty for unprofessional operators, a decrease in sewage treatment effectiveness, and an increase in operation costs. Content of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide an ozone catalytic oxidation device applied to PLC automatic control of ozone dosage.

[0005] An ozone catalytic oxidation device applied to PLC automatic control of ozone dosage includes:

[0006] An alkali solution supply unit, which stores alkali solution with a specific concentration and adjusts the amount of the injected alkali solution as needed;

[0007] An ozone supply unit, which generates ozone and adjusts the amount of the added ozone as needed;

[0008] An ozone catalytic oxidation unit, in which the raw water mixed with alkali solution and ozone undergoes an ozone catalytic oxidation reaction;

[0009] A temperature regulation unit, which heats or cools the ozone catalytic oxidation unit as needed;

[0010] A detection unit, which includes a flow meter, a pH detector, a COD detector and a thermometer. Among them, the flow meter detects the flow rate of the raw water entering the ozone catalytic oxidation unit, the pH detector detects the pH value of the reaction solution in the ozone catalytic oxidation unit, the COD detector detects the COD concentration value of the raw water and the COD concentration value of the effluent after the ozone catalytic oxidation reaction, and the thermometer detects the temperature of the reaction solution in the ozone catalytic oxidation unit.

[0011] Further, the ozone catalytic oxidation unit includes an ozone aeration pipe, an ozone catalyst support layer, and an overflow weir arranged in sequence from bottom to top. Among them, the ozone aeration pipe is connected to the ozone supply unit, and the ozone catalyst support layer is paved with an ozone catalyst.

[0012] Further, the ozone catalyst support layer includes a support frame and a grid plate. The support frame is horizontally fixed inside the ozone catalytic oxidation unit; the grid plate is arranged on the support frame, and a steel wire mesh with a wire diameter of 1 mm and a pore size of 10*10 mm is laid on it in sequence, and two layers of steel wire meshes with a wire diameter of 0.5 mm and a pore size of 4*4 mm are laid on it.

[0013] Further, the ozone catalytic oxidation unit further includes a backwashing aeration pipe network arranged under the ozone aeration pipe. The backwashing aeration pipe network is horizontally fixed inside the ozone catalytic oxidation unit and is connected to an external backwashing roots blower system. The pipe grid spacing of the backwashing aeration pipe network is about 30 cm to 40 cm, the pore diameter is 5 mm, the hole position is 45° downward, and the backwashing aeration intensity reaches 10 L / m 2 ·s or more.

[0014] Further, several layers of backwashing aeration pipe networks are arranged at intervals inside the ozone catalytic oxidation unit.

[0015] Further, the ozone supply unit includes an ozone generator, an ozone flowmeter, an ozone concentration detector, and an ozone dosing regulating valve connected to the ozone generator through a delivery pipeline. The ozone dosing regulating valve adjusts the amount of ozone dosed into the ozone catalytic oxidation unit according to the ozone flowmeter, the ozone concentration detector, and the required amount of ozone.

[0016] Further, the preparation pressure of the ozone generator is controlled at 0.1 MPa.

[0017] Further, the amount of alkali solution dosed by the alkali solution supply unit controls the pH value of the reaction solution in the ozone catalytic oxidation unit to be 7 to 9.

[0018] Further, the temperature regulating unit controls the temperature of the reaction solution in the ozone catalytic oxidation unit to be 20°C to 25°C.

[0019] Further, it further includes a multi-media filter and a filtration booster pump placed in front of the alkali solution supply unit to reduce the suspended solid concentration of the raw water so that the suspended solids < 10 mg / L and the particulate matter should < 60 mesh.

[0020] Compared with the prior art, the ozone catalytic oxidation device based on PLC control of ozone dosing amount of the present utility model has the following beneficial effects:

[0021] 1) The reaction situation of the ozone catalytic oxidation reaction unit is obtained by the set detection unit and fed back to the PLC to control the ozone dosage, avoiding the problems that the raw water treatment cannot meet the standard requirements due to too little ozone dosage and ozone waste caused by too much ozone dosage, effectively improving the ozone utilization efficiency and reducing costs.

[0022] 2) By the set lye supply unit and temperature adjustment unit, ensure that the reaction of the ozone catalytic oxidation reaction unit is carried out at a relatively appropriate pH value and the optimal temperature, so that the utilization efficiency of ozone under unit concentration reaches the maximum, accelerating ozone consumption, reducing the overflow of residual ozone, and reducing ozone waste.

[0023] 3) By setting an ozone aeration pipe and a grid plate of the ozone catalyst support layer in the ozone catalytic oxidation reaction unit, the ozone entering the ozone catalytic oxidation reaction unit can better contact with the ozone catalyst placed on the grid plate of the ozone catalyst support layer, further improving the ozone utilization efficiency and the utilization efficiency of the ozone catalyst.

[0024] 4) By setting an aeration pipe network in the ozone catalytic oxidation reaction unit, the ozone catalytic oxidation reaction unit can be backwashed, cleaning the reaction environment of ozone catalytic oxidation, making the ozone catalyst layer more loose and easily removing the blockage of suspended substances in the interlayer, making the ozone catalyst have good permeability, reducing the amount of catalyst used, and being beneficial to reducing the project investment cost.

[0025] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model. Detailed Embodiment

[0027] Below, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings of the embodiments of the present utility model.

[0028] To solve the problems that after the existing ozone catalytic oxidation system operates for a certain period of time, the associated facilities of the system cannot be mutually inspected and linked, resulting in an increase in the working conditions between the front and rear stages, a decline in the overall efficiency of the system, and a decrease in the sewage treatment effect, the present utility model proposes an ozone catalytic oxidation device for automatically controlling the ozone dosage by PLC. The device obtains the reaction status of ozone catalytic oxidation through the set linked detection unit, and automatically controls and feedback-adjusts the ozone dosage, lye concentration, and reaction temperature of the ozone catalytic oxidation reaction according to the PLC, improving the ozone utilization rate, the sewage treatment effect, and reducing the operation cost.

[0029] Please refer to Figure 1, the ozone catalytic oxidation device applied to the PLC automatic control of ozone dosage in this application includes: an alkali solution supply unit 10, an ozone catalytic oxidation unit 20, an ozone supply unit 30, a detection unit 40, and a temperature regulation unit (not shown in the figure). The alkali solution unit provides an alkali solution with a specific concentration, which is fully mixed with the raw water in the raw water tank 00 and then enters the ozone catalytic oxidation unit 20 to carry out a catalytic oxidation reaction with the ozone generated by the ozone supply unit 30. During this period, the PLC controller obtains the data collected by the detection unit 40 and controls the alkali solution amount of the alkali solution supply unit 10, the temperature regulation of the ozone catalytic oxidation unit 20 by the temperature regulation unit 50, and the ozone dosage of the ozone supply unit 30 according to the relevant data.

[0030] During specific implementation, the alkali solution supply unit 10 includes an alkali solution reservoir 11, an alkali solution storage valve 12, an alkali solution metering pump 13, an alkali solution injector 14, and an alkali solution filling valve 15 connected in sequence. The alkali solution reservoir 11 is used to store an alkali solution with a specific concentration. The filling amount of this alkali solution is controlled by the alkali solution filling valve 15, and it enters the ozone catalytic oxidation unit 20 together with the raw water after the flow rate is adjusted by a lift pump, a check valve, and a flow regulating valve. The alkali solution supply unit 10 is used to adjust the pH value of the raw water, adjust the pH value to 7 - 9, obtain a better ozone catalytic reaction effect, and improve the COD removal effect.

[0031] The ozone catalytic oxidation unit 20 includes a cavity 21, and a backwashing air pipe network 22, an ozone air pipe 23, an ozone catalyst supporting layer 24, and an overflow weir 25 arranged in sequence from bottom to top in the cavity 21.

[0032] The bottom of the cavity 21 is provided with a liquid inlet 210, an air inlet 211, an ozone inlet 212, and a drain valve 213; the middle part is provided with a reaction zone sampling valve port 214, and the upper part is provided with a clear water drain port 215 and a turbid water drain port 216. Among them, the clear water drain port is arranged above the overflow weir 25, and the turbid water drain port 216 is arranged below the overflow weir 25; the top is provided with an ozone exhaust port 217. A flow regulating valve is installed in front of the liquid inlet 210, and the mixed liquid of the raw water and the alkali solution enters the liquid inlet 210 after being regulated by this flow regulating valve, and thus enters the ozone catalytic oxidation unit 20. A backwashing air pipe valve is installed in front of the air inlet opening 211, and the backwashing air enters the air inlet 211 through the backwashing air pipe valve. An ozone dosing valve is installed in front of the ozone inlet 212, and the ozone enters the inlet 212 after being regulated by this ozone dosing valve. The drain valve 213 is used to drain the liquid in the ozone catalytic oxidation unit 20. The reaction zone sampling valve port 214 is used to control the outflow of the reaction liquid, facilitating the detection unit 40 to monitor the state of the ozone catalytic oxidation reaction in the ozone catalytic oxidation unit 20 according to the outflowing reaction liquid. The clear water drain port 215 is used for the discharge of clear water, and the turbid water drain port 216 is used for the discharge of turbid water and backwashing water. The ozone exhaust port is used for the discharge of ozone gas.

[0033] The backwashing aeration pipe network 22 is fixed at the bottom of the housing 21 and horizontally calibrated. It is connected to the air inlet 211. It uses corrosion-resistant pipes, and the materials can be PVDF, ABS, PE, PP, etc. The pipe grid spacing is about 30 cm to 40 cm, the pore diameter is 5 mm, and the hole position is 45° downward. The backwashing aeration intensity reaches 10 L / m 2 ·s or more. The air source of the backwashing aeration pipe network 22 comes from the backwashing roots blower 201, and the flow rate is controlled by the backwashing regulating valve 202. During backwashing, the backwashing aeration pipe network 22 blows air at a large flow rate to purge the gaps between the ozone catalysts and blow out the sediment in the gaps from the catalyst layer. At the same time, due to mechanical action, the pollutants on the surface of the catalyst also fall off and are purged out of the ozone catalyst layer. Backwashing aeration can also loosen the catalyst, which is beneficial to restoring and increasing the flow channel gaps.

[0034] The ozone aeration pipe 23 is fixed at the bottom of the cavity 21 and is located above the backwashing aeration pipe network 22. It is connected to the ozone inlet 212. After the ozone releases pressure through the ozone aeration pipe 23, it diffuses and escapes in the form of ultra-fine bubbles and dissolves in the mixed liquid, extending the residence time of ozone in water. The ozone aeration pipe 23 is made of metal 316L, and ultra-fine pore aerators are installed on the pipe.

[0035] The ozone catalyst support layer 24 includes a support bracket 241 and a grid plate 242 for supporting the ozone catalyst. The support bracket 241 is horizontally fixed in the middle and lower part of the cavity 21. The grid plate 242 is arranged on the support bracket 241, and a steel wire mesh with a wire diameter of 1 mm and a pore diameter of 10*10 mm is laid on it in sequence, and two layers of steel wire meshes with a wire diameter of 0.5 mm and a pore diameter of 4*4 mm are laid on it.

[0036] The overflow weir 25 is used to discharge clear water through the clear water outlet 215 during reaction and discharge turbid water through the turbid water drain outlet 216 during backwashing.

[0037] The ozone supply unit 30 includes an ozone generator 31, a pressure monitor 32, an ozone flowmeter 33, an ozone regulating valve 34, an ozone concentration detector 35, an ozone water-stop and pressure-stabilizing tank 36, and an ozone dosing regulating valve 37, which are connected to the ozone generator 31 through a delivery pipeline. The ozone gas produced by the ozone generator 31 is monitored for real-time pressure by the pressure monitor 32, for real-time flow by the ozone flowmeter 33, for concentration by the ozone concentration detector 35, controlled to flow into the ozone water-stop and pressure-stabilizing tank 36 through the ozone regulating valve 34, and regulated to enter the ozone inlet 212 through the ozone dosing regulating valve 37. The ozone flow information and ozone concentration information detected by the ozone flowmeter 33 and the ozone concentration detector 35 are fed back to the ozone generator 31 to calculate the ozone output. The preparation pressure of the ozone generator 31 is controlled at 0.1 MPa, and the delivery pipeline is made of 316L stainless steel material.

[0038] The detection module 40 includes a liquid level gauge 41, a pH detector 42, a flowmeter 43, a thermometer 44, and a COD detector 45. Among them, the liquid level gauge 41 is arranged at the upper part of the raw water tank for detecting the liquid level of the raw water tank. The pH detector 42 is arranged at the liquid outlet end of the sampling valve port 214 in the reaction zone for detecting the pH value of the reaction liquid in the ozone catalytic oxidation unit 20. The flowmeter 43 is arranged at the outer end of the liquid inlet 210 for detecting the raw water inlet flow rate entering the ozone catalytic oxidation unit 20. The thermometer 44 is arranged in the upper middle part of the ozone catalytic oxidation unit 20 for detecting the temperature of the reaction liquid in the ozone catalytic oxidation unit 20. The first sampling port of the COD detector 45 is connected to the sampling valve port 214 in the reaction zone for detecting the outlet COD concentration value of the treated water after the ozone catalytic oxidation reaction; its second sampling port is connected to the raw water tank for detecting the inlet COD concentration value of the raw water entering the ozone catalytic oxidation unit 20. The liquid level gauge 41 transmits the raw water tank liquid level signal, the pH detector 42 transmits the reaction liquid pH value signal, the flowmeter 43 transmits the raw water flow rate signal, the thermometer 44 transmits the reaction liquid temperature signal, and the COD detector 45 transmits the inlet COD concentration value and the outlet COD concentration value to the PLC controller.

[0039] The temperature adjustment module (not shown in the figure) is used to adjust the temperature of the raw water or the reaction liquid in the ozone catalytic oxidation reactor;

[0040] Furthermore, to prevent the ozone catalyst in the reaction liquid from being silted up by suspended solids and reduce the concentration of suspended solids, floating oil, etc. in the reaction liquid, a multi-media filter and a filtration booster pump are arranged in the pipeline after the raw water tank and before the caustic solution dosing, for reducing the concentration of suspended solids in the raw water to make the suspended solids < 10 mg / L and the particulate matter < 60 mesh.

[0041] Furthermore, several layers of aeration pipe networks are added in the middle of the ozone catalytic oxidation unit 20 to achieve free backwashing for each layer.

[0042] Further, a water path connected to the water production end is added to the backwashing channel of the ozone catalytic oxidation unit 20, and a control valve is arranged on this water path. The produced clean water is used for gas-liquid mixing backwashing, and the cleaning effect is better.

[0043] Compared with the prior art, the ozone catalytic oxidation device based on PLC control of ozone dosage of the present utility model has the following beneficial effects:

[0044] 1) The detection unit is set to obtain the reaction condition of the ozone catalytic oxidation reaction unit and feedback it to the PLC to control the ozone dosage, avoiding the problems that the raw water treatment cannot meet the standard requirements due to too little ozone dosage and ozone waste caused by too much ozone dosage, effectively improving the ozone utilization efficiency and reducing costs.

[0045] 2) By setting the lye supply unit and the temperature adjustment unit, it is ensured that the reaction of the ozone catalytic oxidation reaction unit is carried out at a relatively appropriate pH value and the optimal temperature, so that the utilization efficiency of ozone under unit concentration reaches the maximum, accelerating ozone consumption, reducing the overflow of residual ozone, and reducing ozone waste.

[0046] 3) By arranging the ozone aeration pipe and the grid plate of the ozone catalyst supporting layer in the ozone catalytic oxidation reaction unit, the ozone entering the ozone catalytic oxidation reaction unit can better contact with the ozone catalyst placed on the grid plate of the ozone catalyst supporting layer, further improving the ozone utilization efficiency and the utilization efficiency of the ozone catalyst.

[0047] 4) By arranging the aeration pipe network in the ozone catalytic oxidation reaction unit, the ozone catalytic oxidation reaction unit can be backwashed, cleaning the reaction environment of ozone catalytic oxidation, making the ozone catalyst layer looser and easily removing the blockage of suspended matter in the interlayer, making the ozone catalyst have good permeability, reducing the amount of catalyst used, and being beneficial to reducing the engineering investment cost.

[0048] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of this application. The singular forms "a", "the", and "said" used in the embodiments of this application and the claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that unless otherwise stated, "a plurality" and "several" mean two or more; "and / or" means any or all possible combinations including one or more of the associated listed items; "first", "second", "third", etc. are only used for distinction and not for describing a specific order or sequence, nor can they be understood as indicating or implying relative importance. When the above description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, for those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model is also intended to include these modifications and improvements.

Claims

1. An ozone catalytic oxidation device for automatic control of ozone dosage by PLC, comprising: A lye supply unit, which stores lye of a specific concentration and adjusts the amount of lye added as needed; An ozone supply unit, which generates ozone and adjusts the amount of ozone added as needed; An ozone catalytic oxidation unit, in which raw water mixed with alkali solution and ozone undergoes an ozone catalytic oxidation reaction; A temperature regulating unit, which raises or lowers the temperature of the ozone catalytic oxidation unit as required; The detection unit includes a flow meter, a pH detector, a COD detector and a thermometer, wherein the flow meter detects the flow rate of raw water entering the ozone catalytic oxidation unit, the pH detector detects the pH value of the reaction liquid in the ozone catalytic oxidation unit, the COD detector detects the COD concentration value of the raw water and the COD concentration value of the effluent after the ozone catalytic oxidation reaction, and the thermometer detects the temperature of the reaction liquid in the ozone catalytic oxidation unit.

2. The ozone catalytic oxidation device according to claim 1, characterized in that: The ozone catalytic oxidation unit comprises an ozone aeration pipe, an ozone catalyst supporting layer and an overflow weir which are arranged in sequence from bottom to top, wherein the ozone aeration pipe is connected to the ozone supply unit, and the ozone catalyst is laid on the ozone catalyst supporting layer.

3. The ozone catalytic oxidation device according to claim 2, characterized in that: The ozone catalyst supporting layer includes a supporting frame and a grid plate, wherein the supporting frame is horizontally fixed in the ozone catalytic oxidation unit; the grid plate is arranged on the supporting frame, and a layer of steel wire mesh with a wire diameter of 1 mm and a hole diameter of 10*10 mm and two layers of steel wire mesh with a wire diameter of 0.5 mm and a hole diameter of 4*4 mm are sequentially laid thereon.

4. The ozone catalytic oxidation device according to claim 2 or 3, characterized in that: The ozone catalytic oxidation unit also includes a backwash aeration network arranged under the ozone aeration pipe. The backwash aeration network is horizontally fixed in the ozone catalytic oxidation unit and connected to an external backwash Roots blower system. The backwash aeration network has a pipe grid spacing of about 30cm to 40cm, a hole diameter of 5mm, a hole position of 45° downward, and a backwash aeration intensity of 10L / m 2 ·s or more.

5. The ozone catalytic oxidation device according to claim 4, characterized in that: Several layers of backwash aeration pipe networks are arranged at intervals in the ozone catalytic oxidation unit.

6. The ozone catalytic oxidation device according to claim 4, characterized in that: The ozone supply unit includes an ozone generator, and an ozone flowmeter, an ozone concentration detector and an ozone addition regulating valve connected to the ozone generator through a delivery pipeline. The ozone addition regulating valve adjusts the amount of ozone added to the ozone catalytic oxidation unit according to the ozone flowmeter, the ozone concentration detector and the required amount of ozone.

7. The ozone catalytic oxidation device according to claim 6, characterized in that: The preparation pressure of the ozone generator is controlled at 0.1 MPa.

8. The ozone catalytic oxidation device according to claim 1, characterized in that: The amount of alkali solution added by the alkali solution supply unit controls the pH value of the reaction liquid of the ozone catalytic oxidation unit to be between 7 and 9.

9. The ozone catalytic oxidation device according to claim 1, characterized in that: The temperature regulating unit controls the temperature of the reaction liquid of the ozone catalytic oxidation unit to be between 20°C and 25°C.

10. The ozone catalytic oxidation device according to any one of claims 1, 2, 3, 5, 6, 7, 8, and 9, characterized in that: It also includes a multi-media filter and a filter booster pump placed in front of the alkali solution supply unit to reduce the suspended matter concentration of the raw water to less than 10 mg / L and the particulate matter should be less than 60 meshes.

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