Device for treating isothiazolinone compound production wastewater

Abstract

The utility model discloses a device for treating production wastewater of isothiazolinone compounds, which comprises an ozone generator, a catalytic oxidation reaction tank and a gas-liquid separator which are communicated with one another, the catalytic oxidation reaction tank comprises a tank body, and a multi-stage catalytic layer and a stirring device are arranged in the tank body; the stirring device comprises a stirring shaft rotationally connected with the multi-stage catalyst layer and stirring blades arranged on the stirring shaft, and the top of the stirring shaft is connected with an output shaft of a stirring motor; the upper part of the tank body is provided with a liquid inlet pipe, the lower part of the tank body is provided with a gas distribution mechanism, the gas distribution mechanism comprises a gas delivery pipeline communicated with an ozone generator and a microporous aeration disc communicated with the gas delivery pipeline, the microporous aeration disc is rotationally connected with a stirring shaft, and the stirring shaft is provided with a plurality of guide vanes in the microporous aeration disc; a plurality of air outlet holes are formed in the top of the microporous aeration disc. The device is high in wastewater treatment efficiency, simple in structure and high in gas-liquid contact efficiency, undissolved ozone in the catalytic oxidation process is recycled, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment devices, specifically to a device for treating wastewater from the production of isothiazolinone compounds. Background Technology

[0002] Isothiazolinone compounds are complex preservatives and bactericides mainly composed of two active ingredients: 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one. As a new generation of non-oxidizing bactericides, this series of products demonstrates significant technological advantages in industrial applications: their effective range covers a broad spectrum of antibacterial needs, they possess excellent pH adaptability, and they are characterized by low dosage and strong bactericidal efficacy. Compared to traditional preservatives, these products have excellent compatibility and environmental friendliness, and their toxicity indicators meet green chemical standards, making them an ideal alternative to traditional industrial bactericides. Due to their high cost-effectiveness, isothiazolinones have become the preferred preservative solution globally in fields such as oilfield chemicals, papermaking processes, agricultural plant protection, metalworking fluids, leather products, inks and coatings, dye production, and the leather industry, especially excelling in modern industrial systems that require efficient broad-spectrum bactericidal action while also considering environmental protection requirements.

[0003] The production of isothiazolinones generates a large amount of industrial wastewater with poor biodegradability, making it difficult to treat using traditional biological methods. Therefore, developing a safe and efficient isothiazolinone wastewater treatment technology is crucial. However, current research on devices for treating isothiazolinone wastewater is limited. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device for treating wastewater from the production of isothiazolinone compounds, which addresses the shortcomings of the existing technology. This device uses a combination of ultrasonic cavitation and catalytic ozone oxidation to treat the wastewater, thereby improving the wastewater treatment efficiency. The device has a simple structure, high gas-liquid contact efficiency, and undissolved ozone during the catalytic oxidation process is also recovered and reused, reducing energy consumption.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] An apparatus for treating wastewater from the production of isothiazolinone compounds includes an ozone generator, a catalytic oxidation reaction tank, and a gas-liquid separator connected in series. The catalytic oxidation reaction tank includes a tank body with a multi-stage catalytic layer inside. The tank body also includes a stirring device, which includes a stirring shaft rotatably connected to the multi-stage catalytic layer and multiple stirring blades disposed on the stirring shaft. The top of the stirring shaft is connected to the output shaft of a stirring motor.

[0007] The upper part of the tank is provided with a liquid inlet pipe, and the lower part of the tank is provided with a gas distribution mechanism. The gas distribution mechanism includes a gas delivery pipeline connected to the ozone generator and a microporous aeration disc connected to the gas delivery pipeline. The microporous aeration disc is rotatably connected to the stirring shaft. The stirring shaft is provided with multiple guide vanes inside the microporous aeration disc, and the top of the microporous aeration disc is provided with multiple air outlets.

[0008] Preferably, the stirring blade is provided with multiple guide holes.

[0009] Preferably, the bottom of the stirring shaft is provided with an arc-shaped scraper that abuts against the bottom of the catalytic oxidation reaction vessel.

[0010] Preferably, the catalytic oxidation reactor is further provided with an ultrasonic transducer, which is electrically connected to an ultrasonic generator located outside the catalytic oxidation reactor.

[0011] Preferably, the end of the guide vane is provided with multiple serrations.

[0012] Preferably, multiple air outlets are arranged concentrically, and the density of air outlets at the center of the top of the microporous aeration disc is lower than the density of air outlets at the edge.

[0013] Preferably, the gas delivery pipeline is equipped with a flow regulating valve and a pressure sensor.

[0014] Preferably, it also includes an equalization tank, the outlet of which is connected to the inlet pipe.

[0015] Preferably, the gas outlet of the gas-liquid separator and the gas outlet of the catalytic oxidation reactor are both connected to the regulating tank via a drying tank.

[0016] By adopting the above technical solution, this utility model has at least the following beneficial effects:

[0017] 1. This device discloses an apparatus for treating wastewater from the production of isothiazolinone compounds. It adopts a multi-level catalytic layer structure to form a gradient catalytic reaction zone, thereby improving the degradation efficiency of pollutants, extending the catalyst contact time, and increasing the catalytic oxidation efficiency.

[0018] 2. This device adopts a linkage design between the microporous aeration disc and the stirring shaft. The micron-sized bubbles generated by aeration are broken up twice by the guide vanes, which improves the utilization efficiency of ozone. In addition, the air outlets at the top of the microporous aeration disc are concentric and non-uniformly arranged to form a vortex flow field, while the guide holes on the stirring vanes can also form local turbulence. Based on the above settings, the gas-liquid mixing efficiency is further improved.

[0019] 3. This device uses an ultrasonic transducer to generate a cavitation effect, which works synergistically with the multi-stage catalyst layer to further improve wastewater treatment efficiency.

[0020] 4. Pressure sensors and flow regulating valves are installed on the gas delivery pipeline of this device to achieve dynamic control of ozone dosage and dosage rate, ensuring stable ozone delivery.

[0021] 5. In the catalytic oxidation process of this device, undissolved ozone is separated by a liquid separator and then dried in a drying tank before being reintroduced into the equalization tank for wastewater pretreatment. This improves the ozone recovery rate and reduces energy consumption. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the microporous aeration disc;

[0025] In the diagram, 1. Ozone generator; 2. Catalytic oxidation reactor; 201. Tank body; 202. Catalytic layer; 203. Stirring shaft; 204. Stirring blades; 205. Flow guide hole; 206. Stirring motor; 207. Arc-shaped scraper; 208. Ultrasonic transducer; 3. Gas-liquid separator; 4. Liquid inlet pipe; 5. Gas delivery pipeline; 6. Microporous aeration disc; 7. Flow guide blades; 8. Gas outlet; 9. Serrated edge; 10. Flow regulating valve; 11. Pressure sensor; 12. Adjustment tank; 13. Drying tank. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] Example 1

[0028] like Figure 1-2 As shown in the figure, an apparatus for treating wastewater from the production of isothiazolinone compounds includes an ozone generator 1, a catalytic oxidation reaction tank 2, and a gas-liquid separator 3 connected together. The catalytic oxidation reaction tank 2 includes a tank body 201, and the tank body 201 is provided with a multi-stage catalytic layer 202, which can extend the reaction path and improve the catalytic oxidation effect.

[0029] The tank 201 is also equipped with a stirring device, which includes a stirring shaft 203 rotatably connected to the multi-stage catalyst layer 202 and multiple stirring blades 204 disposed on the stirring shaft 203. The top of the stirring shaft 203 is connected to the output shaft of the stirring motor 206. Under the action of stirring, the contact efficiency between wastewater, ozone and catalyst is effectively improved, thereby improving the catalytic oxidation efficiency.

[0030] The upper part of the tank 201 is provided with a liquid inlet pipe 4, and the lower part of the tank 201 is provided with a gas distribution mechanism. The gas distribution mechanism includes a gas delivery pipeline 5 connected to the ozone generator 1 and a microporous aeration disc 6 connected to the gas delivery pipeline 5. The microporous aeration disc 6 is rotatably connected to the stirring shaft 203. The stirring shaft 203 is provided with multiple guide vanes 7 inside the microporous aeration disc 6, and the top of the microporous aeration disc 6 is provided with multiple air outlets 8. The microporous aeration disc 6, together with the guide vanes 7 and the serrated structure 9 on the guide vanes 7, forms a three-dimensional turbulent field, improving the contact efficiency between ozone and wastewater, thereby improving the utilization rate of ozone. In this embodiment, the stirring vanes 204 are provided with multiple guide holes 205. The arrangement of the guide holes 205 can form local turbulence, enhance solid-liquid mass transfer, and improve wastewater treatment efficiency.

[0031] In this embodiment, the bottom of the stirring shaft 203 is provided with an arc-shaped scraper 207 that abuts against the bottom of the catalytic oxidation reaction vessel 2. The arc-shaped scraper 207 can remove the organic flocs deposited at the bottom of the vessel 201 in real time, thereby improving the treatment effect of organic pollutants.

[0032] In this embodiment, the catalytic oxidation reactor 2 is further equipped with an ultrasonic transducer 208, which is electrically connected to an ultrasonic generator (not shown in the figure) located outside the catalytic oxidation reactor 2. The synergistic effect of ultrasonic cavitation and ozone oxidation effectively decomposes recalcitrant organic matter, significantly improving the degradation efficiency of pollutants in the wastewater from the production of isothiazolinone compounds.

[0033] In this embodiment, the end of the guide vane 7 is provided with multiple serrations 9. The design of the guide vane 7 and its edge serrations 9 can cut large bubbles into micron-sized bubbles, thereby improving ozone dissolution efficiency.

[0034] In this embodiment, multiple air outlets 8 are concentrically arranged. The density of air outlets 8 at the center of the top of the microporous aeration disc 6 is lower than that at the edge. The lower density of air outlets in the central region reduces local flow resistance and avoids turbulent disturbances caused by excessive concentration of airflow in the high-pressure area. The high-density air outlets in the edge region increase the ventilation cross-section and balance the overall air pressure distribution. Moreover, the high-density air outlets at the edge can generate microbubbles, while the low-density air outlets in the center can generate medium-density bubbles, thereby forming a gradient bubble group and increasing the gas-liquid interface contact efficiency.

[0035] In this embodiment, the gas delivery pipeline 5 is equipped with a flow regulating valve 10 and a pressure sensor 11 to ensure the stability of ozone delivery.

[0036] In this embodiment, a regulating tank 12 is also included, the outlet of which is connected to the inlet pipe 4. The gas outlet of the gas-liquid separator 3 and the gas outlet of the catalytic oxidation reactor 2 are both connected to the regulating tank 12 via a dryer 13. The regulating tank 12 can homogenize the wastewater in terms of quality and quantity, avoiding the impact of fluctuations in flow rate or pollutant concentration on the catalytic oxidation process, improving wastewater treatment efficiency, and extending the catalyst's lifespan. The gas after gas-liquid separation is returned to the regulating tank 12 after moisture removal via the dryer 13, achieving the recycling of undissolved ozone.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for treating wastewater from the production of isothiazolinone compounds, characterized in that: The device includes a connected ozone generator, a catalytic oxidation reaction tank, and a gas-liquid separator. The catalytic oxidation reaction tank includes a tank body with a multi-stage catalytic layer inside. The tank body also includes a stirring device, which includes a stirring shaft rotatably connected to the multi-stage catalytic layer and multiple stirring blades mounted on the stirring shaft. The top of the stirring shaft is connected to the output shaft of a stirring motor. The upper part of the tank is provided with a liquid inlet pipe, and the lower part of the tank is provided with a gas distribution mechanism. The gas distribution mechanism includes a gas delivery pipeline connected to the ozone generator and a microporous aeration disc connected to the gas delivery pipeline. The microporous aeration disc is rotatably connected to the stirring shaft. The stirring shaft is provided with multiple guide vanes inside the microporous aeration disc, and the top of the microporous aeration disc is provided with multiple air outlets.

2. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: The stirring blades are provided with multiple flow guide holes.

3. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: The bottom of the stirring shaft is equipped with an arc-shaped scraper that abuts against the bottom of the catalytic oxidation reaction vessel.

4. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: The catalytic oxidation reactor is also equipped with an ultrasonic transducer, which is electrically connected to an ultrasonic generator located outside the catalytic oxidation reactor.

5. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: The end of the guide vane is provided with multiple serrations.

6. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: Multiple air outlets are arranged concentrically, and the density of air outlets at the center of the top of the microporous aeration disc is lower than that at the edge.

7. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: The gas delivery pipeline is equipped with a flow regulating valve and a pressure sensor.

8. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 1, characterized in that: It also includes an equalization tank, the outlet of which is connected to the inlet pipe.

9. The apparatus for treating wastewater from the production of isothiazolinone compounds according to claim 8, characterized in that: The gas outlet of the gas-liquid separator and the gas outlet of the catalytic oxidation reactor are both connected to the regulating tank via a drying tank.

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