Homogeneous ozone catalysis device for treating pharmaceutical wastewater

Abstract

The utility model discloses a homogeneous ozone catalysis device for treating pharmaceutical wastewater, which comprises a wastewater inlet, a premixing device, a pipeline mixer, a micro-nano ozone generator, an acid-base dosing device, a hydrogen peroxide dosing device, an electrolysis device and an ozone catalysis device, the pipeline mixer is connected with an acid-base dosing device and fixedly connected with an electrolysis device, a micro-nano ozone generator is arranged between the pipeline mixer and the electrolysis device, the electrolysis device is connected with an ozone catalysis device, the ozone catalysis device is connected with a hydrogen peroxide dosing device, and a water outlet and a gas outlet are formed in the ozone catalysis device. According to the device disclosed by the utility model, a homogeneous catalytic ozonation process is adopted, transitional heavy metal elements with catalytic action are added through electrolysis, and catalytic ozonation is combined with the micro-nano ozone generator. The method has the advantages of simple control, high catalytic efficiency, no sludge generation and no congestion.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to a homogeneous ozone catalytic device for treating pharmaceutical wastewater. Background Art

[0002] With the progress of industrial development, the number, types, and complexity of artificially synthesized organic matter have continued to increase, resulting in the generation of non-degradable organic wastewater that cannot be ignored. Once the non-degradable organic matter in these wastewaters enters the environment, it not only pollutes the environment, but also accumulates in the food chain and ultimately affects the normal functioning of biological and physiological organs. Pharmaceutical wastewater is a common type of non-degradable industrial wastewater. After biochemical treatment, the wastewater still contains non-degradable organic matter. Such organic matter is generally toxic and harmful, and direct discharge affects the ecology and health. Therefore, it is necessary to adopt efficient and economical deep treatment methods to deeply treat pharmaceutical wastewater. At present, ozone oxidation, electrocatalytic oxidation, Fenton oxidation, etc. are commonly used for deep treatment. Studies have found that a single method is difficult to meet the requirements of the sewage treatment process, so coupled processes are often used.

[0003] Comparative Document 1: Application number "CN106809920A", titled "A Fe-C micro-electrolysis-electro-Fenton process for deep treatment of pesticide wastewater", discloses a coupled micro-electrolysis-electro-Fenton method for treating pesticide wastewater. This method uses a stable spherical material coated with layers of activated carbon powder and iron powder as the filler for Fe-C micro-electrolysis. This filler has insufficient catalytic properties and is easily lost; and the corresponding electro-Fenton sludge output is large, which easily causes secondary pollution. Utility Model Content

[0004] The main purpose of the utility model is to provide a homogeneous ozone catalytic device for treating pharmaceutical wastewater.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A homogeneous ozone catalytic device for treating pharmaceutical wastewater comprises a wastewater inlet, a premixing device, a pipeline mixer, a micro-nano ozone generator, an acid-base dosing device, a hydrogen peroxide dosing device, an electrolysis device and an ozone catalytic device. The wastewater inlet is connected to the premixing device, which is fixedly connected to the pipeline mixer. A first dosing port is provided on the pipeline mixer, which is fixedly connected to the acid-base dosing device via a pipeline. An output port of the pipeline mixer is fixedly connected to the electrolysis device, and a micro-nano ozone generator is fixedly provided between the pipeline mixer and the electrolysis device. The output end of the electrolysis device is fixedly connected to the ozone catalytic device, and the lower end of the ozone catalytic device is fixedly connected to the hydrogen peroxide dosing device. A water outlet and an air outlet are provided on the ozone catalytic device, and the air outlet is fixedly connected to the premixing device.

[0007] Furthermore, the electrolysis device is also provided with a feeding port for transitional heavy metal elements.

[0008] Furthermore, the micro-nano ozone generator includes an ozone generator and a nanogenerator. The output end of the ozone generator is fixedly connected to the nanogenerator, and the nanogenerator generates extremely fine bubbles with a diameter of less than 50 microns.

[0009] Furthermore, the hydrogen peroxide dosing device is arranged at the bottom of the ozone catalytic device.

[0010] Furthermore, the ozone catalytic device is a bottom-water-inlet and top-water-outlet structure.

[0011] Furthermore, a pH online meter is provided in the pipeline mixer.

[0012] Furthermore, a method for using a homogeneous ozone catalytic device for treating pharmaceutical wastewater includes the following specific steps:

[0013] Step 1: Inlet water, the pipeline mixer adjusts the pH value of the wastewater according to the pH value obtained by the configured pH online instrument, and cooperates with the acid and alkali dosing equipment to maintain the pH of the inlet water at 6-7;

[0014] Step 2: Increase the ozone concentration in the wastewater and add transition heavy metal elements by electrolysis. Use copper, manganese and other metal elements as anodes. Under the action of electricity, the anodes are corroded and released in ion form.

[0015] Step 3: Ozone catalytic oxidation section, ozone catalysis is carried out by injecting hydrogen peroxide, and the wastewater after catalysis is discharged;

[0016] Step 4: The overflow gas from the ozone catalytic oxidation section is used as ozone pretreatment for the raw water, and an ozone destruction generator is installed on the top.

[0017] Furthermore, in step 2, the ozone concentration in the flowing ozone gas is increased by utilizing the effect of the electric field;

[0018] The electrolysis device reduces the electron cloud density of organic pollutants, providing a basis for subsequent ozone oxidation.

[0019] Furthermore, in step 3, hydrogen peroxide is added to the bottom of the ozone catalytic oxidation section, and the reaction device adopts a bottom water inlet and top water outlet form.

[0020] Furthermore, the ozone concentration of the initial wastewater in the ozone catalytic device is controlled at 20-50 mg / L, and the amount of hydrogen peroxide added is controlled at 0-1‰.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The utility model combines a micro-nano generator to improve the solubility of ozone in water and enhance the mass transfer efficiency of the combination of ozone and pollutants. In conjunction with the use of a catalytic oxidant, the catalytic effect of ozone is significantly enhanced. At the same time, no sludge is produced and no secondary pollution is caused.

[0023] Electrolysis is used as a pretreatment to couple ozone catalytic oxidation. The electrolysis process increases the ozone concentration and reduces the electron cloud density of the organic structure, which is more conducive to the effectiveness of subsequent ozone catalytic oxidation. Ozone catalytic oxidation is accompanied by hydrogen peroxide to enhance the catalytic reaction.

[0024] The tail gas of the utility model contains a large amount of oxygen and a small amount of ozone, which can be recycled for pretreatment to reduce energy consumption and oxidize organic matter in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the present utility model.

[0026] Reference numerals

[0027] 1. Wastewater inlet; 2. Pre-mixing device; 3. Pipeline mixer; 4. Micro-nano ozone generator; 5. Acid and alkali dosing device; 6. Hydrogen peroxide dosing device; 7. Electrolysis device; 8. Ozone catalysis device. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0029] Ozone (O3) is an oxidant whose oxidizing ability is second only to fluorine, hydroxyl radicals and atomic oxygen, and is 1.5 times that of chlorine (Cl2). Therefore, it is often used in water treatment. Its oxidation mechanism is mainly reflected in two aspects: on the one hand, ozone molecules directly oxidize organic matter through electrophilic substitution and dipolar addition reactions, thereby removing pollutants in wastewater; on the other hand, ozone undergoes a chain reaction in water to generate hydroxyl radicals with strong oxidizing properties, and uses hydroxyl radicals to oxidize organic pollutants; ozone mainly converts unsaturated organic pollutants into easily degradable pollutants through ring opening or bond breaking reactions, achieving "pretreatment" but not mineralization; in addition, the solubility and stability of ozone in water are not high, and the cost of ozone production is high.

[0030] The synergistic effect of ozone and hydrogen peroxide increases the production of hydroxyl radicals compared to ozone alone, achieving a higher removal efficiency for difficult-to-degrade pollutants. Electrolytic addition of transitional heavy metals not only reduces the electron cloud density of organic pollutants, significantly reducing the ineffective consumption of hydroxyl radicals, but also utilizes the metal ions in the solution to promote the catalytic oxidation process of ozone decomposition, thereby increasing the production of hydroxyl radicals.

[0031] See also Figure 1 As shown, a homogeneous ozone catalytic device for treating pharmaceutical wastewater includes a wastewater inlet 1, a premixing device 2, a pipeline mixer 3, a micro-nano ozone generator 4, an acid-base dosing device 5, a hydrogen peroxide dosing device 6, an electrolysis device 7 and an ozone catalytic device 8. The wastewater inlet 1 is connected to the premixing device 2, and the premixing device 2 is fixedly connected to the pipeline mixer 3. A first dosing port is provided on the pipeline mixer 3, and the first dosing port is fixedly connected to the acid-base dosing device 5 through a pipeline. The output port of the pipeline mixer 3 is fixedly connected to the electrolysis device 7, and a micro-nano ozone generator 4 is fixedly provided between the pipeline mixer 3 and the electrolysis device 7. The output end of the electrolysis device 7 is fixedly connected to the ozone catalytic device 8, and the lower end of the ozone catalytic device 8 is fixedly connected to the hydrogen peroxide dosing device 6. The ozone catalytic device 8 is provided with a water outlet and an air outlet, and the air outlet is fixedly connected to the premixing device 2.

[0032] The electrolysis device 7 is also provided with a feeding port for transitional heavy metal elements.

[0033] The micro-nano ozone generator 4 includes an ozone generator and a nano-generator. The output end of the ozone generator is fixedly connected to the nano-generator, and the nano-generator generates extremely fine bubbles with a diameter of less than 50 microns.

[0034] The hydrogen peroxide dosing device 6 is arranged at the bottom of the ozone catalytic device 8 .

[0035] The ozone catalytic device 8 is a bottom-water-inlet-top-water-outlet structure.

[0036] The pipeline mixer 3 is provided with a pH online meter.

[0037] A method for using a homogeneous ozone catalytic device for treating pharmaceutical wastewater, comprising the following specific steps:

[0038] Step 1: Inlet water, pipeline mixer 3 adjusts the pH value of wastewater according to the pH value obtained by the configured pH online instrument, and cooperates with the acid and alkali dosing equipment to maintain the pH of the inlet water at 6-7;

[0039] Step 2: Increase the ozone concentration in the wastewater and add transition heavy metal elements by electrolysis. Use copper, manganese and other metal elements as anodes. Under the action of electricity, the anodes are corroded and released in ion form.

[0040] Step 3: Ozone catalytic oxidation section, ozone catalysis is carried out by injecting hydrogen peroxide, and the wastewater after catalysis is discharged;

[0041] Step 4: The overflow gas from the ozone catalytic oxidation section is used as ozone pretreatment for the raw water, and an ozone destruction generator is installed on the top.

[0042] In step 2, the ozone concentration in the flowing ozone gas is increased by utilizing the effect of the electric field;

[0043] The electrolysis device 7 provides a basis for subsequent ozone oxidation by reducing the electron cloud density of organic pollutants.

[0044] In the step 3, hydrogen peroxide is added to the bottom of the ozone catalytic oxidation section, and the reaction device adopts the form of water inlet at the bottom and water outlet at the top.

[0045] The ozone concentration of the initial wastewater in the ozone catalytic device 8 is controlled at 20-50 mg / L, and the amount of hydrogen peroxide added is controlled at 0-1‰.

[0046] The utility model takes in water through a wastewater inlet 1, performs ozone premixing through a pre-mixing device 2, and then adjusts the pH value of the wastewater through a pipeline mixer 3. A pH online meter is used to display the real-time pH value of the wastewater. Then, a sufficient amount of ozone is injected into the wastewater, and the wastewater then enters an electrolysis device 7 for electrolysis. Transitional heavy metal elements are added by electrolysis, and metal elements such as copper and manganese are used as anodes. Under the action of electricity, the anodes are dissolved and released in an ionic state. Finally, the wastewater enters an ozone catalytic device 8 and is added with hydrogen peroxide for ozone catalysis to complete the final purification. The excess ozone is discharged into the pre-mixing device 2 for reuse.

[0047] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the content disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A homogeneous ozone catalytic device for treating pharmaceutical wastewater, characterized by: The invention comprises a wastewater inlet (1), a premixing device (2), a pipeline mixer (3), a micro-nano ozone generator (4), an acid-base dosing device (5), a hydrogen peroxide dosing device (6), an electrolysis device (7) and an ozone catalysis device (8), wherein the wastewater inlet (1) is connected to the premixing device (2), the premixing device (2) is fixedly connected to the pipeline mixer (3), the pipeline mixer (3) is provided with a first dosing port, and the first dosing port is connected to the acid-base dosing device (5) through a pipeline. The output port of the pipeline mixer (3) is fixedly connected to the electrolysis device (7), and a micro-nano ozone generator (4) is fixedly provided between the pipeline mixer (3) and the electrolysis device (7). The output end of the electrolysis device (7) is fixedly connected to an ozone catalytic device (8), and the lower end of the ozone catalytic device (8) is fixedly connected to a hydrogen peroxide dosing device (6). A water outlet and an air outlet are provided on the ozone catalytic device (8), and the air outlet is fixedly connected to the pre-mixing device (2).

2. A homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The electrolysis device (7) is also provided with a feeding port for transitional heavy metal elements.

3. The homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The micro-nano ozone generator (4) comprises an ozone generator and a nanogenerator. The output end of the ozone generator is fixedly connected to the nanogenerator, and the nanogenerator generates extremely fine bubbles with a diameter of less than 50 microns.

4. The homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The hydrogen peroxide dosing device (6) is arranged at the bottom of the ozone catalytic device (8).

5. The homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The ozone catalytic device (8) is a bottom-water-inlet and top-water-outlet structure.

6. The homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The pipeline mixer (3) is provided with a pH online meter.

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