Electrocatalytic oxidation device for petrochemical wastewater treatment

Abstract

An electrocatalytic oxidation device for petrochemical wastewater treatment relates to an electrocatalytic oxidation device, aims to solve the technical problem of low electrocatalytic oxidation efficiency of the existing electrocatalytic oxidation device, and comprises a treatment chamber, an electrode plate, a connecting frame, a stirring motor, a stirring shaft and a stirring rod, an electrode plate is arranged in the treatment chamber, a stirring motor is fixed on a connecting frame at the upper part of the treatment chamber, and a stirring shaft and a stirring rod are arranged in the treatment chamber. Compared with a device without stirring, the chemical oxygen demand removal rate of the petrochemical wastewater is increased by 30-35%, the total organic carbon removal rate is increased by 40-45%, and the total nitrogen removal rate is increased by 18-20%. The method can be used in wastewater treatment field.

Description

Technical Field

[0001] This utility model relates to an electrocatalytic oxidation device. Background Technology

[0002] The petrochemical industry generates massive amounts of water and wastewater. Furthermore, due to the diverse products and complex production lines within the industry, petrochemical wastewater exhibits complex characteristics, often containing large amounts of persistent and toxic pollutants such as benzene compounds, phenols, aldehydes, and polycyclic aromatic hydrocarbons, posing a significant risk to aquatic ecosystems. Therefore, petrochemical wastewater must undergo effective treatment before being discharged into the aquatic environment. Electrocatalytic oxidation of petrochemical wastewater is highly efficient and controllable, achieving efficient pollutant removal with high removal and conversion rates. By adjusting reaction conditions and catalyst selection, precise control of the electrocatalytic oxidation process can be achieved, improving process stability and repeatability. However, this method also faces challenges in areas such as the development of highly efficient catalysts, optimization of energy consumption and costs, engineering application and scaling, and overall efficiency. Currently, some electrocatalytic oxidation devices suffer from low electrocatalytic oxidation efficiency due to fixed electrode plate positions and the essentially stagnant state of the wastewater within the treatment tank, thus affecting the treatment effect on petrochemical wastewater. Utility Model Content

[0003] This invention aims to solve the technical problem of low electrocatalytic oxidation efficiency in existing electrocatalytic oxidation devices, and provides an electrocatalytic oxidation device for petrochemical wastewater treatment. This device addresses the issue that wastewater is essentially stagnant in the wastewater treatment tank, leading to low electrocatalytic oxidation efficiency of the electrode plates. It also has the advantages of small footprint, good treatment effect, and ease of use and maintenance.

[0004] The electrocatalytic oxidation device for petrochemical wastewater treatment of this utility model includes a treatment chamber 1, an electrode plate 2, a connecting frame 3, a stirring motor 4, a stirring shaft 5, and a stirring rod 6.

[0005] The treatment chamber 1 is a cylindrical body with end caps at the top and bottom. Electrode plates 2 are installed on both sides of the inner wall of the treatment chamber 1. A water inlet pipe 1-1 is installed on the upper end cap of the treatment chamber 1, and a connecting frame 3 is also installed on the upper end cap of the treatment chamber 1. A stirring motor 4 is installed on the connecting frame 3. The output shaft of the stirring motor 4 is connected to the stirring shaft 5. Stirring rods 6 are evenly welded on the upper part of the stirring shaft 5. The stirring shaft 5 and the axis of the cylindrical body of the treatment chamber 1 are on the same straight line.

[0006] Water outlet pipes 1-2 are installed at the lower end cover of treatment chamber 1;

[0007] Sampling tubes 1-3 are installed from bottom to top on the side wall of the treatment chamber 1; a dissolved oxygen detection probe port 1-4 is set in the middle of the opposite side of the treatment chamber 1; a dissolved oxygen detection probe 1-5 is inserted into the treatment chamber 1 through the dissolved oxygen detection probe port 1-4; a sludge discharge pipe 1-6 is set in the lower part of the side wall of the treatment chamber 1, through which solid sediments formed in the device can be discharged.

[0008] Furthermore, water outlet valves 1-7 are installed on water outlet pipes 1-2.

[0009] Furthermore, sampling valves 1-8 are installed on sampling tubes 1-3.

[0010] Furthermore, the number of sampling tubes 1-3 is 3 to 5, and the interval between each sampling tube 1-3 is 10 to 12 cm, which can collect water samples at different depths, which is beneficial to the function of the detection device.

[0011] Furthermore, a support platform 7 is also provided at the lower part of the processing chamber 1.

[0012] Furthermore, the connecting frame 3 and the processing chamber 1 are detachable, and the connecting frame 3 is hollow in the middle, which facilitates the disassembly and inspection of the device.

[0013] The working principle of the electrocatalytic oxidation device for petrochemical wastewater treatment is as follows: Petrochemical wastewater is introduced into the treatment chamber 1 through the inlet pipe 1-1. When the electrode plate 2 is energized, an electrocatalytic oxidation reaction occurs, treating the petrochemical wastewater and separating and removing pollutants. The stirring motor 4 drives the stirring shaft 5 and stirring rod 6 to rotate at a speed of 100-120 rpm, thus fully agitating the petrochemical wastewater in the treatment chamber 1, increasing the contact rate between the wastewater and the electrode plate 2, thereby improving the electrocatalytic oxidation efficiency of the electrode plate 2 and effectively enhancing the treatment effect. After treatment, the outlet valve 1-7 on the outlet pipe 1-2 is opened, and the electrocatalytically oxidized petrochemical wastewater flows out. After the device stops operating, the solid pollutants formed in the treatment chamber 1 are discharged through the sludge discharge pipe 1-6.

[0014] This invention relates to an electrocatalytic oxidation device for petrochemical wastewater treatment, which combines electrodes and a treatment chamber equipped with a stirring device. It occupies a small area, and the upper connecting frame is detachable from the treatment chamber for easy use and maintenance. Sampling ports at different depths on the side facilitate sampling for monitoring and adjusting the device. A sludge discharge pipe is installed at the bottom of the treatment chamber to remove solid pollutants formed in the device. Compared to reactors without a stirring device, this electrocatalytic oxidation device for petrochemical wastewater treatment improves the removal rate of chemical oxygen demand (COD) by 30%–35%, total organic carbon (TOC) by 40%–45%, and total nitrogen (TN) by 18%–20%. It can be used in the field of wastewater treatment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the electrocatalytic oxidation device for petrochemical wastewater treatment according to this utility model;

[0016] Figure 2 This is a structurally disassembled schematic diagram of the electrocatalytic oxidation device for petrochemical wastewater treatment according to this utility model.

[0017] Figure 3 This is a structural schematic diagram of support platform 7;

[0018] 1 is the treatment chamber; 1-1 is the inlet pipe; 1-2 is the outlet pipe; 1-3 is the sampling pipe; 1-4 is the dissolved oxygen detection probe port; 1-5 is the dissolved oxygen detection probe; 1-6 is the sludge discharge pipe; 1-7 is the outlet valve; 1-8 is the sampling valve; 2 is the electrode plate; 3 is the connecting frame; 4 is the stirring motor; 5 is the stirring shaft; 6 is the stirring rod; 7 is the support platform. Detailed Implementation

[0019] The beneficial effects of this utility model are verified using the following examples.

[0020] Example 1: The electrocatalytic oxidation device for petrochemical wastewater treatment in this example consists of a treatment chamber 1, an electrode plate 2, a connecting frame 3, a stirring motor 4, a stirring shaft 5, a stirring rod 6, and a support platform 7;

[0021] The treatment chamber 1 is a cylindrical body with end caps at the top and bottom. Electrode plates 2 are installed on both sides of the inner wall of the treatment chamber 1. A water inlet pipe 1-1 is installed on the upper end cap of the treatment chamber 1, and a connecting frame 3 is also installed on the upper end cap of the treatment chamber 1. The connecting frame 3 is a detachable hollow type. A stirring motor 4 is installed on the connecting frame 3. The output shaft of the stirring motor 4 is connected to the stirring shaft 5. Stirring rods 6 are evenly welded on the upper part of the stirring shaft 5. The stirring shaft 5 and the axis of the cylindrical body of the treatment chamber 1 are on the same straight line.

[0022] A water outlet pipe 1-2 is installed at the lower end cover of the treatment chamber 1; a water outlet valve 1-7 is installed on the water outlet pipe 1-2;

[0023] Sampling tubes 1-3 are installed from bottom to top on the side wall of the treatment chamber 1; there are 4 sampling tubes 1-3, and the interval between each sampling tube 1-3 is 10cm. Sampling valves 1-8 are installed on the sampling tubes 1-3; a dissolved oxygen detection probe port 1-4 is installed on the middle side wall opposite to the sampling tubes 1-3; a dissolved oxygen detection probe 1-5 is inserted into the treatment chamber 1 through the dissolved oxygen detection probe port 1-4; a sludge discharge pipe 1-6 is installed at the lower part of the side wall of the treatment chamber 1, through which solid sediments formed in the device can be discharged.

[0024] A support platform 7 is also provided at the lower part of the processing chamber 1, and the support platform 7 is welded to the lower part of the processing chamber 1.

[0025] The electrocatalytic oxidation device for petrochemical wastewater treatment described in Example 1 was used to treat petrochemical wastewater. The specific steps were as follows: petrochemical wastewater was introduced into treatment chamber 1 through inlet pipe 1-1. Electrode plates 2 were energized to induce an electrocatalytic oxidation reaction, treating the wastewater and separating and removing pollutants. A stirring motor 4 drove the stirring shaft 5 and stirring rod 6 to rotate at a speed of 108 rpm, thus fully agitating the wastewater in treatment chamber 1, increasing the contact rate between the wastewater and electrode plates 2, thereby improving the electrocatalytic oxidation efficiency of the electrode plates and effectively enhancing the treatment effect. After treatment, the outlet valve 1-7 on outlet pipe 1-2 was opened, allowing the electrocatalytically oxidized wastewater to flow out. After the device was stopped, the solid pollutants formed in treatment chamber 1 were discharged through sludge discharge pipe 1-6. The same petrochemical wastewater was treated under the same conditions (stirring motor 4 off, other parameters identical). The removal rates of pollutants were compared between the conditions with stirring motor 4 on and off, and the results are shown in Table 1. As can be seen from Table 1, compared with the condition of turning off the stirring motor 4, the removal rate of chemical oxygen demand (COD) increased by 33.4%, the removal rate of total organic carbon (TOC) increased by 44%, and the removal rate of total nitrogen (TN) increased by 18.4%.

[0026] Table 1 shows the pollutant removal efficiency under the conditions of stirring motor 4 being on and off.

[0027] the difference COD removal rate TOC removal rate TN removal rate Turn on the stirring motor 4 78.6％ 73.8％ 89.5％ Turn off the stirring motor 4 52.3％ 51.2％ 75.6％

Claims

1. An electrocatalytic oxidation device for treating petrochemical wastewater, characterized in that, The device includes a processing chamber (1), an electrode plate (2), a connecting frame (3), a stirring motor (4), a stirring shaft (5), and a stirring rod (6); The treatment chamber (1) is a cylindrical body with end caps on the top and bottom. Electrode plates (2) are installed on both sides of the inner wall of the treatment chamber (1). A water inlet pipe (1-1) is installed on the upper end cap of the treatment chamber (1), and a connecting frame (3) is also installed on the upper end cap of the treatment chamber (1). A stirring motor (4) is installed on the connecting frame (3), and the output shaft of the stirring motor (4) is connected to the stirring shaft (5). Stirring rods (6) are uniformly welded on the stirring shaft (5), and the stirring shaft (5) and the axis of the cylindrical body of the treatment chamber (1) are on the same straight line. A water outlet pipe (1-2) is installed at the lower end cover of the treatment chamber (1); A sampling tube (1-3) is installed from bottom to top on the side wall of the treatment chamber (1); a dissolved oxygen detection probe socket (1-4) is set in the middle of the opposite side of the treatment chamber (1); a dissolved oxygen detection probe (1-5) is inserted into the treatment chamber (1) through the dissolved oxygen detection probe socket (1-4); a sludge discharge pipe (1-6) is set in the lower part of the side wall of the treatment chamber (1).

2. The electrocatalytic oxidation device for petrochemical wastewater treatment according to claim 1, characterized in that, A water outlet valve (1-7) is installed on the water outlet pipe (1-2).

3. An electrocatalytic oxidation device for petrochemical wastewater treatment according to claim 1 or 2, characterized in that, A sampling valve (1-8) is installed on the sampling tube (1-3).

4. An electrocatalytic oxidation device for petrochemical wastewater treatment according to claim 1 or 2, characterized in that, The number of sampling tubes (1-3) is 3 to 5, and the interval between each sampling tube (1-3) is 10 to 12 cm.

5. An electrocatalytic oxidation device for treating petrochemical wastewater according to claim 1 or 2, characterized in that, A support platform (7) is also provided at the lower part of the processing chamber (1).

6. An electrocatalytic oxidation device for treating petrochemical wastewater according to claim 1 or 2, characterized in that, The connecting frame (3) and the processing chamber (1) are separable, and the connecting frame (3) is hollow in the middle.

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