A homogeneous ozone catalytic device for treating pharmaceutical wastewater and a method of using the same

Abstract

The application discloses a kind of processing pharmaceutical wastewater homogeneous phase ozone catalytic device and its use method, including wastewater inlet, premixing device, pipeline mixer, micro-nano ozone generator, acid-base dosing device, hydrogen peroxide dosing device, electrolytic device and ozone catalytic device, wastewater inlet is connected with premixing device, premixing device is connected with pipeline mixer, pipeline mixer is connected with acid-base dosing device, pipeline mixer is fixedly connected with electrolytic device, micro-nano ozone generator is arranged between pipeline mixer and electrolytic device, electrolytic device is connected with ozone catalytic device, ozone catalytic device is connected with hydrogen peroxide dosing device, outlet and gas outlet are arranged on ozone catalytic device, gas outlet is connected with premixing device, the application uses homogeneous phase ozone catalytic oxidation process, by electrolytic dosing catalytic transition heavy metal element, ozone catalytic oxidation is combined with micro-nano ozone generator.Control is simple, catalytic efficiency is high, no sludge is generated, no congestion.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and particularly to a homogeneous ozone catalytic device for treating pharmaceutical wastewater and its method of use. Background Technology

[0002] With the progress of industrial development, the quantity, types, and complexity of artificially synthesized organic matter are constantly increasing, leading to the generation of significant amounts of recalcitrant organic wastewater. Once these recalcitrant organic compounds enter the environment, they not only pollute the environment but also accumulate through the food chain, ultimately affecting the normal functioning of biological physiological systems. Pharmaceutical wastewater is a common type of recalcitrant industrial wastewater. Even after biochemical treatment, it still contains recalcitrant organic matter, which is generally toxic and harmful; direct discharge impacts the ecosystem and health. Therefore, efficient and economical advanced treatment methods are needed for pharmaceutical wastewater. Currently, advanced treatment commonly employs ozone oxidation, electrocatalytic oxidation, and Fenton oxidation. Research has found that single methods are insufficient to meet the requirements of wastewater treatment processes; therefore, coupled processes are often used.

[0003] Reference document 1: Application number "CN106809920A", entitled "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. The Fe-C micro-electrolysis packing material is a stable spherical material coated with layers of activated carbon powder and iron powder. This packing material has insufficient catalytic activity and is easy to be lost; moreover, the corresponding electro-Fenton sludge production is large, which can easily cause secondary pollution. Summary of the Invention

[0004] The main objective of this invention is to provide a homogeneous ozone catalytic device for treating pharmaceutical wastewater and its method of use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A homogeneous ozone catalytic device for treating pharmaceutical wastewater includes a wastewater inlet, a premixing device, a pipeline mixer, a micro / nano ozone generator, an acid / alkali 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. The pipeline mixer has a first dosing port, which is fixedly connected to the acid / alkali dosing device via a pipeline. The output port of the pipeline mixer is fixedly connected to the electrolysis device, and a micro / nano ozone generator is fixedly installed 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. The ozone catalytic device has a water outlet and a gas outlet, and the gas outlet is fixedly connected to the premixing device.

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

[0008] Furthermore, the micro-nano ozone generator 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 produces extremely fine bubbles with a diameter of less than 50 micrometers.

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

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

[0011] Furthermore, the pipeline mixer is equipped with an online pH meter.

[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 of the wastewater according to the pH value obtained from the configured online pH meter, in conjunction with the acid and alkali dosing equipment, to maintain the inlet water pH at 6-7.

[0014] Step 2: Increase the ozone concentration in the wastewater and add transition heavy metal elements by electrolysis. Copper, manganese and other metal elements are used as anodes. Under the action of electricity, the anode is dissolved and released in ionic state.

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

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

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

[0018] Electrolysis devices reduce the electron cloud density of organic pollutants, thus 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 inlet and top outlet water form.

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

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

[0022] This invention combines a micro-nano generator to improve the solubility of ozone in water and enhance the mass transfer efficiency of ozone binding with pollutants. With the use of a catalytic oxidant, it significantly enhances the catalytic effect of ozone. At the same time, no sludge is generated and no secondary pollution occurs.

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

[0024] The exhaust gas of this invention contains a large amount of oxygen and a small amount of ozone, which can be recycled as pretreatment to reduce energy consumption, while also oxidizing organic matter in water. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure Labels

[0027] 1. Wastewater inlet; 2. Premixing 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 catalytic device. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to 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 providing a clearer and more explicit definition of the scope of protection of the present invention.

[0029] Ozone (O3) is an oxidant with an oxidizing power second only to fluorine, hydroxyl radicals, and atomic oxygen, and its oxidizing power 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: one is that ozone molecules directly oxidize organic matter through electrophilic substitution and dipole addition reactions, thereby removing pollutants from wastewater; the other is that ozone undergoes a chain reaction in water to generate hydroxyl radicals with strong oxidizing power, which are used to oxidize organic pollutants. Ozone mainly converts unsaturated organic pollutants into easily degradable pollutants through ring-opening or bond-breaking reactions, achieving "pretreatment," but it cannot mineralize them. In addition, ozone has low solubility and stability in water, and its production cost is high.

[0030] The synergistic effect of ozone and hydrogen peroxide, compared to ozone alone, increases the generation of hydroxyl radicals, resulting in a higher removal efficiency for recalcitrant pollutants. Electrolytic addition of transition heavy metals reduces the electron cloud density of organic pollutants, significantly decreasing the ineffective consumption of hydroxyl radicals. Furthermore, the addition of transition heavy metals utilizes the metal ions in the solution to promote the catalytic oxidation process of ozone decomposition, thereby increasing the generation of hydroxyl radicals.

[0031] See 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 pipeline mixer 3 is fixedly connected to the premixing device 2. The pipeline mixer 3 has a first dosing port, which is fixedly connected to the acid-base dosing device 5 via a pipeline. The output port of the pipeline mixer 3 is fixedly connected to the electrolysis device 7, and the micro-nano ozone generator 4 is fixedly installed 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 has a water outlet and a gas outlet, and the gas outlet is fixedly connected to the premixing device 2.

[0032] The electrolysis device 7 is also equipped 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 produces extremely fine bubbles with a diameter of less than 50 micrometers.

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

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

[0036] The pipeline mixer 3 is equipped with an online pH meter.

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

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

[0039] Step 2: Increase the ozone concentration in the wastewater and add transition heavy metal elements by electrolysis. Copper, manganese and other metal elements are used as anodes. Under the action of electricity, the anode is dissolved and released in ionic state.

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

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

[0042] In step 2, the ozone concentration in the overflowing ozone gas is increased by the effect of an electric field.

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

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

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

[0046] This invention introduces wastewater through wastewater inlet 1, premixes it with ozone through premixing device 2, adjusts the pH value of the wastewater through pipeline mixer 3, displays the real-time pH value of the wastewater using an online pH meter, injects sufficient ozone into the wastewater, and then electrolyzes it in electrolysis device 7. Transitional heavy metal elements are added during electrolysis, with copper, manganese, and other metal elements as anodes. Under the action of electricity, the anode is dissolved and released in ionic state. Finally, the wastewater enters ozone catalysis device 8 where hydrogen peroxide is added for ozone catalysis to complete the final purification. Excess ozone is discharged into premixing device 2 for reuse.

[0047] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A homogeneous ozone catalytic device for treating pharmaceutical wastewater, characterized in that: The system 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), which is fixedly connected to the pipeline mixer (3). The pipeline mixer (3) has a first dosing port, which is connected to the acid-base dosing device (5) via a pipeline. The output port of the pipe mixer (3) is fixedly connected to the electrolysis device (7), and a micro-nano ozone generator (4) is fixedly installed between the pipe mixer (3) and the electrolysis device (7). An ozone catalytic device (8) is fixedly connected to the output end of the electrolysis device (7), and a hydrogen peroxide dosing device (6) is fixedly connected to the lower end of the ozone catalytic device (8). The ozone catalytic device (8) has a water outlet and an air outlet, and the air outlet is fixedly connected to the premixing device (2).

2. The homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 1, characterized in that: The electrolysis device (7) is also equipped 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) 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 micrometers.

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

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

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

7. A method of using a homogeneous ozone catalytic device for treating pharmaceutical wastewater, characterized in that: Including specific steps: Step 1, water inlet, pipeline mixer (3) according to the pH value obtained by the configured pH online instrument, and in conjunction with the acid and alkali dosing equipment, adjust the pH value of the wastewater to keep the inlet pH at 6-7; Step 2: Increase the ozone concentration in the wastewater and add transition heavy metal elements by electrolysis. Copper, manganese and other metal elements are used as anodes. Under the action of electricity, the anode is dissolved and released in ionic state. Step 3, ozone catalytic oxidation section, ozone catalysis is carried out by injecting hydrogen peroxide, and the wastewater after catalysis is completed is discharged; Step 4: The gas overflowing from the ozone catalytic oxidation section is used as ozone pretreatment for the raw water, and an ozone destruction generator is installed at the top.

8. The method of using a homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 7, characterized in that: In step 2, the ozone concentration in the overflowing ozone gas is increased by the effect of an electric field. The electrolysis device (7) provides a basis for subsequent ozone oxidation by reducing the electron cloud density of organic pollutants.

9. The method of using a homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 7, characterized in that: In step 3, hydrogen peroxide is added to the bottom of the ozone catalytic device (8), and the reaction device adopts a bottom water inlet and top water outlet form.

10. The method of using a homogeneous ozone catalytic device for treating pharmaceutical wastewater according to claim 9, characterized in that: The ozone concentration in the initial wastewater of the ozone catalytic device (8) is controlled at 20-50 mg / L, and the hydrogen peroxide dosage is controlled at 0-1‰.

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