TWM624493U - Isopropyl Alcohol Wastewater Treatment System - Google Patents

Abstract

This creation discloses an isopropanol wastewater treatment system, which is used for treating wastewater containing isopropanol. The isopropanol wastewater treatment system includes: a mixing device, a preheating device and a microwave catalytic device. The mixing device has a waste water input end, an oxidant input end and a mixed liquid output end. The preheating device is in fluid communication with the mixing device. The microwave catalytic device is in fluid communication with the preheating device. The microwave catalytic device is used for treating the waste water, and the microwave catalytic device has a catalyst fixed bed and a microwave generator.

Description

Isopropyl Alcohol Wastewater Treatment System

This creation relates to an isopropanol wastewater treatment system, especially an isopropanol wastewater treatment system for treating low-concentration isopropanol.

In the semiconductor industry, isopropanol is commonly used to clean silicon wafers to remove impurities and contaminants on the silicon wafers, resulting in isopropanol-containing wastewater. In the technical field, depending on the content of isopropanol, wastewater can be divided into high isopropanol content wastewater (about 10 wt% to 20 wt%) and low isopropanol content wastewater (about 100 ppm to 2000 ppm) , and developed different isopropanol wastewater treatment systems for different concentrations of isopropanol wastewater.

In the prior art, an isopropanol wastewater treatment system is provided, which is a catalytic oxidation system equipped with a gas/liquid mass transfer unit (eg: stripping column or distillation column). After the wastewater containing isopropanol is sent to the gas/liquid mass transfer unit, the isopropanol is extracted to the gas phase by stripping or evaporation, and then the gas phase isopropanol is guided to the gas phase through the gas collection pipeline. The media oxidation system further decomposes the isopropanol gas into carbon dioxide and water vapor to achieve the effect of removing isopropanol.

However, in this isopropanol wastewater treatment system, in the step of extracting gas-phase isopropanol, a large amount of gas (about 200 to 1000 times the volume flow of wastewater) needs to be used, and a high temperature (more than 250 °C) to achieve the effect of isopropanol separation. Therefore, this isopropanol wastewater treatment system has the disadvantage of large energy consumption.

In addition, during the treatment process, the content of isopropanol in the gas phase is higher than the lower explosive limit (LEL) of isopropanol, and there is a risk of explosion. Specifically, the lower explosive limit concentration of isopropanol is 2 vol%, and the general safe operating condition is 1/4 of the lower explosive limit concentration.

The prior art provides another isopropanol wastewater treatment system, which is to pass the isopropanol-containing wastewater into a microbial treatment device, and utilize the aerobic microorganisms in the device to decompose the isopropanol. In order to maintain the survival of microorganisms, a large amount of air (or oxygen) needs to be continuously introduced in the process of wastewater treatment.

After isopropanol is decomposed, the treated wastewater will be produced with a large amount of activated sludge. Therefore, a solid-liquid separation unit (such as a gravity sedimentation tank) and a sludge should be installed downstream of the isopropanol wastewater treatment system. Return conveying equipment to avoid the loss of activated sludge with decomposing ability.

In order to ensure the decomposition ability of the isopropanol wastewater treatment system, it is necessary to plan and control the concentration of microorganisms, and timely eliminate the aging activated sludge, and hand over the aging activated sludge to waste sludge manufacturers for treatment.

To sum up, the above-mentioned isopropanol wastewater treatment system involves the decomposition of microorganisms, and there are many uncontrollable factors, and the overall wastewater treatment time is long, the equipment occupies a large space, and the problem of treating aging sludge is also derived.

Therefore, how to overcome the above-mentioned defects by improving the system to improve the inconvenience of treating isopropanol wastewater has become one of the important issues to be solved by this project.

The technical problem to be solved by this creation is to provide an isopropanol wastewater treatment system in view of the deficiencies of the prior art.

In order to solve the above-mentioned technical problems, one of the technical solutions adopted in this creation is to provide an isopropanol wastewater treatment system. The isopropanol wastewater treatment system is used to treat wastewater containing isopropanol. The isopropanol wastewater treatment system includes: a mixing device, a preheating device and a microwave catalytic device. The mixing device has a waste water input end, an oxidant input end and a mixed liquid output end. The preheating device is in fluid communication with the mixing device. The microwave catalytic device is in fluid communication with the preheating device. The microwave catalytic device is used for treating waste water, and the microwave catalytic device has a catalyst fixed bed and a microwave generator.

In an embodiment of the present invention, the microwave generator faces the catalyst fixed bed.

In an embodiment of the present invention, the microwave generator surrounds the catalyst fixed bed, and the wavelength range of the microwave generator is set to be 0.8 GHz to 2.45 GHz.

In an embodiment of the present invention, the microwave generator communicates with the fixed catalyst bed through a microwave waveguide.

In an embodiment of the present invention, the catalyst fixed bed is filled with a catalyst, and the volume filling amount of the catalyst is 1/3 to 1/2 of the total volume of the catalyst fixed bed.

In an embodiment of the present invention, the microwave catalytic device is a vertical microwave catalytic device, and the microwave catalytic device has a preheating liquid receiving end, a treatment liquid discharging end and a gas discharging end, and the preheating liquid receiving end is located at the microwave catalytic A bottom end of the device, the treatment liquid discharge end and the gas discharge end are located at a top end of the microwave catalytic device.

In an embodiment of the present invention, the preheating device has a heat exchange pipe, a high temperature liquid receiving end and a low temperature liquid discharge end, and the heat exchange pipe is in fluid communication between the high temperature liquid receiving end and the low temperature liquid discharge end; wherein, The high temperature liquid receiving end is in fluid communication with a treatment liquid discharging end of the microwave catalytic device.

In an embodiment of the present invention, the mixing device has a reflux liquid receiving end, and the reflux liquid receiving end is in fluid communication with a reflux liquid output end of the microwave catalytic device.

In an embodiment of the present invention, the preheating device has a mixed solution receiving end and a preheating solution output end, the mixed solution receiving end is in fluid communication with the mixed solution output end, and the preheating solution output end is connected to a preheating solution of the microwave catalytic device. The hydrothermal receiver is in fluid communication.

One of the beneficial effects of the present invention is that the isopropyl alcohol wastewater treatment system provided by the present invention can be achieved through "the mixing device has a wastewater input end, an oxidant input end and a mixed liquid output end" and "the microwave catalytic device has a A catalyst fixed bed and a microwave generator" technical scheme to achieve the effect of treating wastewater containing isopropanol.

In order to further understand the features and technical content of this creation, please refer to the following detailed descriptions and drawings about this creation, however, the provided drawings are only for reference and description, and are not intended to limit this creation.

The following are specific specific examples to illustrate the embodiments of the "isopropanol wastewater treatment system" disclosed in the present creation, and those skilled in the art can understand the advantages and effects of the present creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this creation. In addition, the drawings in this creation are only for simple schematic illustration, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present creation in detail, but the disclosed contents are not intended to limit the protection scope of the present creation. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be.

The present creation provides an isopropyl alcohol wastewater treatment system, which is used for treating wastewater containing isopropyl alcohol. Moreover, the isopropyl alcohol wastewater treatment system of the present creation is not limited by the content of isopropyl alcohol. That is to say, the isopropanol wastewater treatment system of this creation is suitable for treating high isopropanol content wastewater (about 10 wt% to 20 wt%) and low isopropanol content wastewater (about 100 ppm to 2000 ppm), especially suitable for For the treatment of wastewater with low isopropanol concentration.

Specifically, in this work, an oxidant is added to the wastewater, and microwaves are applied to induce the oxidant to generate free radicals with strong oxidizing power on the surface of the catalyst. Then, under the synergistic action of free radicals and catalysts, the isopropanol in the wastewater can be oxidized to generate carbon dioxide and water, so as to achieve the effect of treating the isopropanol wastewater.

[First Embodiment]

Referring to FIG. 1 , the first embodiment of the present invention provides an isopropyl alcohol wastewater treatment system, which includes: a mixing device 1 , a preheating device 2 and a microwave catalytic device 3 .

The mixing device 1 is used to mix a waste water and an oxidant to form a mixed solution. The preheating device 2 is in fluid communication with the mixing device 1, and the preheating device 2 is used for preheating the mixed solution for subsequent treatment of waste water. The microwave catalytic device 3 and the preheating device 2 are in fluid communication with each other, and the microwave catalytic device 3 is used for decomposing the isopropanol in the wastewater to form a treatment liquid. The specific decomposition method of isopropyl alcohol will be described later.

In an exemplary embodiment, the mixing device 1 has a waste water input end 11 , an oxidant input end 12 and a mixed liquid output end 13 . The waste water input 11 is configured to introduce waste water to be treated into the mixing device 1 . The wastewater referred to in this creation contains isopropanol, and particularly refers to wastewater with an isopropanol concentration of 0.2 wt% to 1.0 wt%. The oxidant input 12 is configured to deliver a dose of oxidant to the wastewater to accelerate the rate of decomposition of the isopropanol. The mixed liquor output 13 is configured to discharge the mixed liquor (wastewater and oxidant) out of the mixing device 1 .

For example, the oxidizing agent may be sodium hypochlorite, persulfate, hydrogen peroxide, or a combination thereof. The concentration of the oxidant in the mixed liquor may be 0.5 M to 1.0 M. When the concentration of the oxidant is in this range, the combination of microwave and catalyst has better decomposition effect. However, this creation is not limited to this.

In actual use, the waste water input end 11 of the mixing device 1 can introduce waste water through a first conveying pipeline A1. Wastewater can go through one or more pretreatment processes first, and then be introduced into the first conveying pipeline A1. The pretreatment process can be a physical treatment process (such as screening, mixing, etc.) or a chemical treatment process (such as chemical coagulation, chemical precipitation, etc.) , neutralization, adsorption, etc.).

In some embodiments, the isopropanol wastewater treatment system may further include a wastewater storage tank (not shown in the figure) for storing the wastewater to be treated, and the wastewater storage tank may pass through the first transmission line A1 and the mixing device 1 The waste water input end 11 is communicated.

In an exemplary embodiment, the preheating device 2 has a mixed liquid receiving end 21 and a preheating liquid output end 22 . The mixed liquid receiving end 21 is configured to receive the mixed liquid produced by the mixing device 1 . The preheated liquid output 22 is configured to discharge the preheated mixed liquid. The preheating device 2 can heat the mixture to 80°C to 100°C.

In some embodiments, the preheating device 2 may be equipped with a heating device to directly heat the mixed solution. In other embodiments, the preheating device 2 may be provided with a heat exchange pipe, and the effect of indirectly heating the mixed liquid can be achieved by introducing other fluids with higher temperature.

In actual use, the mixed liquid receiving end 21 of the preheating device 2 can be in fluid communication with the first waste water output end 13 of the mixing device 1 through a second conveying pipeline A2.

The microwave catalytic device 3 has a preheating liquid receiving end 31 , a gas discharge end 32 and a treatment liquid discharge end 33 . The preheating liquid receiving end 31 is configured to receive the mixed liquid heated by the preheating device 2 . The gas discharge end 32 is configured to discharge a gaseous product (carbon dioxide) produced by the microwave catalytic device 3 . The treatment liquid discharge end 33 is configured to discharge the treatment liquid generated by the microwave catalytic device 3 .

In actual use, the preheating liquid receiving end 31 of the microwave catalytic device 3 can be in fluid communication with the preheating liquid output end 22 of the preheating device 2 through a third conveying pipeline A3.

Referring to FIG. 2 , the microwave catalytic device 3 has a main body 30 , a bottom end of the main body 30 is formed with a preheating liquid receiving end 31 , and a top end of the main body 30 is formed with a gas discharge end 32 and a treatment liquid discharge end 33 . That is to say, the microwave catalytic device 3 may be a vertical microwave catalytic device, the waste liquid is introduced from the bottom end, and then discharged from the top end after being processed.

The body 30 has a fixed catalyst bed 35 inside, and the fixed catalyst bed 35 is in fluid communication between the bottom end and the top end of the body 30 . Therefore, the waste liquid flowing in through the preheating liquid receiving end 31 will flow through the catalyst fixed bed 35 and then flow out of the microwave catalytic device 3 .

The fixed catalyst bed 35 may be a fixed catalyst bed made of quartz. The catalyst fixed bed 35 is filled with a granular first catalyst 36 . The material of the catalyst 36 can be platinum, palladium, ruthenium-iridium alloy, manganese, activated carbon or a combination thereof. The average particle diameter of the catalyst 36 is 0.5 mm to 1.0 mm. In addition, based on the total volume of the entire catalyst fixed bed 35 (100 volume percent), the volume filling amount of the catalyst 36 in the catalyst fixed bed 35 is 1/3 to 1/2 (33.3 vol % to 50 vol %) .

The microwave catalytic device 3 has a microwave generator 37 . The microwave generator 37 faces the fixed catalyst bed 35 to apply microwaves to the fixed catalyst bed 35 . In an exemplary embodiment, the microwave generator 37 surrounds the catalyst fixed bed 35, so that the microwave generator 37 can provide microwaves stably and continuously, and can prevent microwave leakage.

In an exemplary embodiment, the microwave generator 37 communicates with the fixed catalyst bed 35 through a microwave waveguide 38 . The microwave generator 37 can face the catalyst in the fixed catalyst bed 35 through the microwave waveguide 38, so as to achieve the best decomposition effect. Preferably, the microwave wavelength range of the microwave generator 37 can be set to 0.8 GHz to 2.45 GHz.

Specifically, after the mixed solution is introduced into the catalyst fixed bed 35 , the oxidant will be induced by microwaves to generate free radicals on the surface of the catalyst 36 . Isopropanol (C ₃ H ₇ OH) in wastewater will first react with free radicals (such as hydroxyl radicals) to generate small molecular organic acids, which are further decomposed into carbon dioxide and water. Therefore, the gaseous product generated by the microwave catalytic device 3 includes carbon dioxide, and the treatment liquid generated by the microwave catalytic device 3 includes water and a very small amount (or undetectable) of small molecular organic acids.

The decomposition reaction of isopropanol is an exothermic reaction, so the temperature of the treatment liquid will be higher than that of the mixed liquid. In order to save energy, the high temperature of the treatment liquid can be exchanged for heat to effectively utilize thermal energy.

[Second Embodiment]

Referring to FIG. 3 , the second embodiment of the present invention provides an isopropyl alcohol wastewater treatment system, and the isopropyl alcohol wastewater treatment system of the second embodiment is similar to the isopropyl alcohol wastewater treatment system ( FIG. 1 ) of the first embodiment , the difference is: the isopropanol wastewater treatment system further includes a first return line B1. The first return line B1 is used to introduce the high temperature treatment liquid into the preheating device 2 , and the first return line B1 is in fluid communication between the microwave catalytic device 3 and the preheating device 2 .

In an exemplary embodiment, the preheating device 2 further has a heat exchange pipe, a high temperature liquid receiving end 23 and a low temperature liquid discharge end 24, and the heat exchange pipe is fluidly connected between the high temperature liquid receiving end 23 and the low temperature liquid discharge end 24. between. The first return line B1 is fluidly connected to the high-temperature liquid receiving end 23 and the treatment liquid discharge end 33 of the microwave catalytic device 3. Therefore, the first return line B1 can exchange heat between the high-temperature treatment liquid and the low-temperature mixed liquid, so as to achieve the effect of heating the mixed liquid. Effect.

[Third Embodiment]

Referring to the figure, the third embodiment of the present invention provides an isopropyl alcohol wastewater treatment system. The isopropyl alcohol wastewater treatment system of the third embodiment is similar to the isopropyl alcohol wastewater treatment system ( FIG. 1 ) of the first embodiment. The difference is that the isopropanol wastewater treatment system further includes a second return line B2. The second return line B2 is used to improve the treatment effect of the isopropanol wastewater treatment system, and the second return line B2 is fluidly connected between the microwave catalytic device 3 and the mixing device 1 .

In an exemplary embodiment, the microwave catalytic device 3 further has a reflux liquid output end 34, and the mixing device 1 also has a reflux liquid receiving end. The second return line B2 is in fluid communication with the return fluid output end 34 and the return fluid receiving end, so the second return line B2 can reintroduce the treatment fluid into the mixing device 1 so as to decompose the isopropanol again.

[Advantageous effects of the embodiment]

One of the beneficial effects of the present invention is that the isopropyl alcohol wastewater treatment system provided by the present invention can be achieved through "the mixing device has a wastewater input end, an oxidant input end and a mixed liquid output end" and "the microwave catalytic device has a A catalyst fixed bed and a microwave generator” technical scheme to achieve the effect of treating wastewater. During the overall treatment process, the oxidant can generate radicals with strong oxidizing power on the surface of the catalyst under the induction of microwaves. In addition, under the synergistic effect of free radicals and catalysts, the isopropanol in the wastewater can be oxidized, thereby generating carbon dioxide and water, so as to achieve the effect of decomposing the isopropanol in the wastewater.

Furthermore, the microwave generator can be further configured to face the fixed catalyst bed, or the microwave waveguide can be arranged to make the microwave generator face the fixed catalyst bed, so that the microwave generator can be guaranteed to generate The microwaves are completely absorbed by the catalyst fixed bed. Combining the above two configurations, the microwave generator can be arranged around the fixed catalyst bed, and a microwave waveguide is used to connect the microwave generator and the fixed catalyst bed. Therefore, the present invention can optimize the wastewater treatment effect by adjusting the relative arrangement relationship between the fixed catalyst bed and the microwave generator.

Furthermore, the packing ratio of the catalyst in the fixed bed reaction and the particle size of the catalyst can be further controlled. By controlling the size of the catalyst in the catalyst fixed bed, the wastewater treatment efficiency can be optimized to treat a large amount of wastewater in a short period of time.

The contents disclosed above are only the preferred and feasible embodiments of this creation, and are not intended to limit the scope of the patent application of this creation. Therefore, any equivalent technical changes made by using the descriptions and drawings of this creation are included in the application for this creation. within the scope of the patent.

1: Mixing device 11: Wastewater input 12: Oxidant input 13: Mixed liquid output 14: Reflux receiver 2: Preheating device 21: Mixed liquid receiving end 22: Preheating liquid output 23: High temperature liquid receiving end 24: Cryogenic liquid discharge end 3: Microwave catalytic device 30: Ontology 31: Preheating liquid receiving end 32: Gas discharge end 33: Treatment liquid discharge end 34: Reflux output 35: Catalyst fixed bed 36: Catalyst 37: Microwave Generator 38: Microwave waveguide A1: The first delivery line A2: Second delivery line A3: The third delivery line B1: The first return line B2: Second return line

FIG. 1 is a schematic diagram of an isopropanol wastewater treatment system according to the first embodiment of the invention.

FIG. 2 is a schematic cross-sectional view of the created microwave catalytic device.

3 is a schematic diagram of an isopropyl alcohol wastewater treatment system according to a second embodiment of the invention.

FIG. 4 is a schematic diagram of an isopropanol wastewater treatment system according to a third embodiment of the invention.

1: Mixing device

11: Wastewater input

12: Oxidant input

13: Mixed liquid output

2: Preheating device

21: Mixed liquid receiving end

22: Preheating liquid output

3: Microwave catalytic device

31: Preheating liquid receiving end

32: Gas discharge end

33: Treatment liquid discharge end

A1: The first delivery line

A2: Second delivery line

A3: The third delivery line

Claims (9)

An isopropanol wastewater treatment system, which is used to treat a wastewater containing isopropanol, the isopropanol wastewater treatment system comprising: a mixing device, the mixing device has a waste water input end, an oxidant input end and a mixed liquid output end; a preheating device in fluid communication with the mixing device; and a microwave catalytic device, the microwave catalytic device is in fluid communication with the preheating device, and the microwave catalytic device is used for treating the wastewater; Wherein, the microwave catalytic device has a catalyst fixed bed and a microwave generator. The isopropyl alcohol wastewater treatment system of claim 1, wherein the microwave generator faces the catalyst fixed bed. The isopropanol wastewater treatment system of claim 1, wherein the microwave generator surrounds the catalyst fixed bed, and the wavelength range of the microwave generator is set to be 0.8 GHz to 2.45 GHz. The isopropanol wastewater treatment system according to claim 1, wherein the microwave generator communicates with the catalyst fixed bed through a microwave waveguide. The isopropanol wastewater treatment system according to claim 1, wherein the catalyst fixed bed is filled with a catalyst, and the volume filling amount of the catalyst is 1/3 of the total volume of the catalyst fixed bed to 1/2. The isopropanol wastewater treatment system according to claim 1, wherein the microwave catalytic device is a vertical microwave catalytic device, and the microwave catalytic device has a preheating liquid receiving end, a treatment liquid discharging end and a gas A discharge end, the preheating liquid receiving end is located at a bottom end of the microwave catalytic device, and the treatment liquid discharge end and the gas discharge end are located at a top end of the microwave catalytic device. The isopropyl alcohol wastewater treatment system according to claim 1, wherein the preheating device has a heat exchange pipe, a high temperature liquid receiving end and a low temperature liquid discharge end, and the heat exchange pipe is in fluid communication with the high temperature between the liquid receiving end and the low temperature liquid discharge end; wherein the high temperature liquid receiving end is in fluid communication with a treatment liquid discharge end of the microwave catalytic device. The isopropyl alcohol wastewater treatment system according to claim 1, wherein the mixing device has a reflux liquid receiving end, and the reflux liquid receiving end is in fluid communication with a reflux liquid output end of the microwave catalytic device. The isopropyl alcohol wastewater treatment system according to claim 1, wherein the preheating device has a mixed solution receiving end and a preheating solution output end, and the mixed solution receiving end is in fluid communication with the mixed solution output end and the preheating liquid output end is in fluid communication with a preheating liquid receiving end of the microwave catalytic device.

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